Non-oxide composite reinforced slag ladle spray coating and preparation method thereof

Abstract

The invention discloses a non-oxide composite reinforced slag ladle spray coating and a preparation method thereof, and relates to the technical field of metallurgical auxiliary materials. The foaming material is prepared from the following components in parts by weight: 10-15 parts of polysilazane modified phenolic resin, 3-5 parts of anhydrous potassium sodium borate, 2-4 parts of nano silicon carbide sol, 2 parts of silicon nitride micro powder, 0.5-2 parts of coated microcapsule foaming agent, 66-77.5 parts of non-oxide main body reinforcing phase, 1-2 parts of suspending agent and 1-2 parts of slag-resistant aid. The non-oxide main body reinforcement phase is formed by mixing black silicon carbide and micro-expanded crystalline flake graphite according to the weight ratio of 9: 4; according to the invention, a high-performance slag ladle spray coating system is constructed, and a non-oxide main body reinforcement phase and various auxiliaries are compounded, so that various properties are improved, and the service life of a slag ladle is prolonged; a targeted preparation process is designed, so that the components are fully dispersed and fused, the resin modification effect is guaranteed, the problem of dry material agglomeration is solved, the slurry performance is accurately regulated and controlled, the use performance consistency is guaranteed, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of metallurgical auxiliary materials technology, specifically to a non-oxide composite reinforced slag can spray coating and its preparation method. Background Technology

[0002] In the metallurgical industry's production process, slag pots, as core equipment that carries high-temperature molten slag, are subjected to harsh conditions such as high temperatures, slag erosion, and sudden temperature changes. The protective treatment of their inner walls directly affects the service life, production efficiency, and production safety of the equipment. To improve the slag pot's resistance to slag, thermal shock, and high temperatures, the industry commonly uses specialized spray coatings to form a protective coating on the inner wall of the slag pot. This isolates the molten slag from direct contact with the slag pot substrate, reducing equipment wear. Non-oxide materials, due to their excellent high-temperature performance, chemical stability, and resistance to slag erosion, have become important raw materials in the research and application of slag pot spray coatings. The research and optimization of related non-oxide composite reinforced spray coatings have also become an important research direction in the field of metallurgical auxiliary materials, meeting the industry's actual needs for high-performance and long-life protective materials for slag pots.

[0003] Traditional slag pot coatings have many shortcomings in terms of composition design and performance. The bonding system of some coatings is prone to pyrolysis and softening under high temperature conditions, which leads to a decrease in the bonding strength between the coating and the slag pot substrate, resulting in problems such as coating cracking and peeling, and failing to form a continuous and effective protection. Some coatings have insufficient resistance to slag erosion and penetration, and high-temperature molten slag can easily cause erosion and corrosion of the coating, and even penetrate into the substrate, causing equipment damage. At the same time, traditional coatings have poor thermal shock resistance. Under the condition of rapid temperature rise and fall, the coating is prone to cracking due to thermal stress, further reducing the protective effect. In addition, the preparation process of traditional coatings does not have sufficient control over the dispersion and integration of each component, which can easily lead to uneven composition, resulting in poor slurry sprayability and low coating performance consistency. Moreover, the storage stability of some coating slurries is not good, and sedimentation and stratification are prone to occur, increasing the difficulty of on-site construction. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a non-oxide composite reinforced slag pot spray coating and its preparation method. This spray coating uses polysilazane-modified phenolic resin as the binder system, compounded with functional additives such as anhydrous potassium sodium borate and nano-silicon carbide sol, and combined with a non-oxide main reinforcing phase composed of black silicon carbide and micro-expanded flake graphite. The components are scientifically proportioned and functionally synergistic. The preparation method consists of three steps: modified resin preparation, dry material homogenization, and liquid-solid slurry preparation. Through refined processes such as nitrogen-protected grafting, high-temperature drying, gradient stirring, and constant-temperature storage, the components are fully dispersed and integrated, and the slurry properties are precisely controlled. This spray coating exhibits excellent high-temperature adhesion, slag erosion resistance, and thermal shock resistance. It also has excellent slurry storage and spraying performance, is easy to apply, and can form a stable protective coating on the inner wall of the slag pot, extending the service life of the equipment. It is suitable for the industrial production and construction needs of the metallurgical industry and has significant application value.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: On the one hand, a non-oxide composite reinforced slag tank spray coating, the coating comprising, by weight, the following components: 10-15 parts of polysilazane modified phenolic resin, 3-5 parts of anhydrous potassium sodium borate, 2-4 parts of nano-silicon carbide sol, 2 parts of silicon nitride micro powder, 0.5-2 parts of encapsulated microcapsule foaming agent, 66-77.5 parts of non-oxide main reinforcing phase, 1-2 parts of suspending agent, and 1-2 parts of anti-slag additive;

[0006] The non-oxide host reinforcing phase is composed of black silicon carbide and micro-expanded flake graphite mixed in a weight ratio of 9:4.

[0007] Furthermore, the polysilazane-modified phenolic resin is prepared by grafting thermosetting phenolic resin and polymethylsilazane at a weight ratio of 4:1. The thermosetting phenolic resin has a softening point of 80-100℃ and a free phenol content of ≤5wt%. The polymethylsilazane has a number average molecular weight of 1000-3000g / mol. The polysilazane-modified phenolic resin is a viscous solid at 25℃ with a viscosity of 5000-10000mPa·s.

[0008] Furthermore, the nano-silicon carbide sol is a β-crystalline silicon carbide nano-sol with a solid content of 30%-40%, a silicon carbide nanoparticle size of 20-50 nm, a sol pH of 7-9, and no alcohol dispersant; the anhydrous potassium sodium borate is a compound of potassium borate and sodium borate in a weight ratio of 1:1-2:1, with a particle size of 100-200 mesh, no water of crystallization, and a loss on ignition of ≤0.5 wt% at 800°C.

[0009] Furthermore, the encapsulated microcapsule foaming agent has a core-shell structure, with the wall material being gaseous SiO2 or light CaCO3, the wall material thickness being 2-4 μm, the core being one of n-butane, n-pentane or light magnesium carbonate, the core accounting for 40%-60% of the total weight of the microcapsule, and the overall particle size of the microcapsule being 50-100 μm.

[0010] Furthermore, the black silicon carbide is a 250-mesh ultrafine powder with a carbon content ≤0.5% and a free silicon content ≤0.3%; the micro-expanded flake graphite has a flake thickness of 1-5μm, a particle size of 200-325 mesh, a fixed carbon content ≥99%, and an ash content ≤0.5%; the suspending agent is fused fiber RSU with a fiber length of 10-50μm and a fiber diameter of 1-3μm; the anti-slag additive is α-crystalline alumina ultrafine powder with a particle size ≤1μm and a particle size distribution D50 of 0.3-0.5μm.

[0011] On the other hand, a non-oxide composite reinforced slag can spray coating and its preparation method are described, the specific steps of which are as follows:

[0012] S1, Preparation of modified resin: Phenolic resin and polysilazane are added to a nitrogen-protected reaction vessel at a weight ratio of 4:1. The temperature inside the vessel is adjusted to 120-150℃, and the grafting reaction is carried out at a stirring rate of 200-300r / min for 2-3h. After the reaction is completed, the mixture is naturally cooled to room temperature to obtain polysilazane-modified phenolic resin, which is then sealed for later use.

[0013] S2, Dry material homogenization: Weigh anhydrous potassium sodium borate, silicon nitride micro powder, encapsulated microcapsule foaming agent, non-oxide main reinforcing phase, suspending agent, and anti-slag additive according to the weight parts, put all the dry materials into a high-speed mixing device and stir to mix, so as to obtain a non-oxide dry material mixture with uniform composition.

[0014] S3, Liquid-Solid Pulping: Polysilazane-modified phenolic resin and nano-silicon carbide sol are added to the non-oxide dry material mixture, and metallurgical hot quenching circulating water is added. First, the mixture is stirred at a medium speed to initially fuse the liquid phase with the dry materials. Then, the stirring speed is increased to 3000 r / min for high-speed stirring. The amount of water added is adjusted to achieve a slurry bulk density of 1.2-1.3 g / cm³. 3 The viscosity is 20-25s. After stirring, the mixture is allowed to stand to remove bubbles, and a spraying slurry is obtained. The obtained spraying slurry is transferred to a special storage tank, and the slurry is continuously stirred at low speed. The volume density and viscosity of the slurry are tested regularly, and the slurry with fluctuating performance is fine-tuned accordingly.

[0015] Furthermore, the phenolic resin is dried at 60-80℃ for 2-3 hours before use, and the polysilazane is added to the reactor at a dropping rate of 5-10 mL / min. The nitrogen gas introduced into the reactor has a purity of ≥99.99% and a gas flow rate of 0.5-1 m. 3The gas flow rate is 5-8℃ / min, and the continuous aeration time is no less than 30 min. During the cooling stage, the gas flow rate is maintained at 50-80 r / min and stirred until room temperature.

[0016] Furthermore, the anhydrous potassium sodium borate, silicon nitride micro powder, black silicon carbide, micro-expanded flake graphite, and anti-slag additive are dried at 100-120℃ for 4-6 hours; the encapsulated microcapsule foaming agent is sieved through a screen; the stirring speed of the high-speed mixing equipment is 1500-2000 r / min and the mixing time is 10-15 min; the mixed dry material is sieved through a screen again.

[0017] Furthermore, a vertical high-speed pulper with a wall scraping function is used. After the dry material is added, it is stirred at a low speed of 500-600 r / min. Polysilazane-modified phenolic resin is added uniformly along the inner wall of the pulper, and nano-silicon carbide sol is added by atomization. The medium-speed stirring rate for the initial fusion of the liquid phase and the dry material is 800-1000 r / min, and the stirring time is 5-8 min. Metallurgical hot quenching circulating water is added first at 70% of the total water volume, and the remaining water is added in 3-5 batches. The high-speed stirring lasts for 15-20 min, and the material temperature in the pulper is controlled at 25-35℃ during the stirring process. The settling and degassing time is 2-3 min, and there is no additional stirring or vibration operation during the settling process.

[0018] Furthermore, the dedicated slurry storage tank is equipped with a constant temperature jacket and an anchor-type stirring paddle. The constant temperature jacket controls the slurry temperature at 20-30℃, and the stirring speed of the stirring paddle is 50-80 r / min. When the slurry viscosity is too high, metallurgical hot quenching circulating water is added along the inner wall of the slurry storage tank, and the mixture is stirred at a speed of 100-150 r / min for 1-2 minutes. The slurry is taken out from the discharge port at the bottom of the slurry storage tank. Before taking it out, the stirring device is turned on and stirred for 5-8 minutes.

[0019] Compared with existing technologies, the non-oxide composite reinforced slag can spray coating and its preparation method have the following advantages:

[0020] I. This invention constructs a high-performance slag pot coating system by compounding a non-oxide main reinforcing phase and combining it with various functional additives. The reasonable ratio of the non-oxide main reinforcing phase gives the coating excellent high-temperature strength and thermal shock resistance. The synergistic effect of modified resin and nano-silicon carbide sol effectively improves the film-forming properties and adhesion strength of the coating, making the coating more tightly bonded to the slag pot substrate and less prone to peeling and cracking. The addition of anhydrous potassium sodium borate and anti-slag additives enhances the coating's resistance to slag erosion and penetration, effectively resisting the scouring and corrosion of molten slag. The core-shell structure design of the encapsulated microcapsule foaming agent can form a uniform microporous structure at high temperatures, further optimizing the coating's thermal insulation performance and thermal expansion matching, and significantly extending the service life of the slag pot.

[0021] II. This invention achieves full dispersion and uniform fusion of all components of the spray coating through a targeted preparation process. The nitrogen-protected grafting reaction in the modified resin preparation stage ensures the effect of resin modification, giving the resin both organic binding and inorganic high-temperature resistance properties. The drying and high-speed mixing treatment in the dry material homogenization stage avoids the problem of dry material agglomeration and improves the compositional uniformity of the dry material mixture. The step-by-step addition of liquid, gradient stirring and temperature control in the liquid-solid slurry preparation process precisely regulates the physicochemical properties of the spray slurry, giving the slurry good sprayability and stability. The constant temperature and continuous stirring design of the special slurry storage tank effectively prevents slurry sedimentation and stratification, ensuring the performance consistency of the spray coating during use, simplifying on-site construction operations and improving construction efficiency.

[0022] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0024] Figure 1 Flowchart of the preparation process for non-oxide composite reinforced slag can spray coating;

[0025] Figure 2 This is a flowchart of the dry powder homogenization and mixing process;

[0026] Figure 3 This is a dry powder homogenization and mixing process;

[0027] Figure 4 This is a flowchart of the spray coating slurry preparation process. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0029] Example 1:

[0030] A complete process for preparing a non-oxide composite reinforced slag can spray coating

[0031] This embodiment completes the preparation of a non-oxide composite reinforced slag can spray coating. The precise weight proportions of each component are as follows: 13 parts polysilazane-modified phenolic resin, 4 parts anhydrous potassium sodium borate, 3 parts nano-silicon carbide sol, 2 parts silicon nitride micropowder, 1.2 parts encapsulated microcapsule foaming agent, 70.8 parts non-oxide main reinforcing phase, 1.5 parts suspending agent, and 1.5 parts anti-slag additive. The non-oxide main reinforcing phase is composed of black silicon carbide and micro-expanded flake graphite mixed in a weight ratio of 9:4. Specific steps are as follows... Figure 1 As shown.

[0032] S1, Preparation of modified resin:

[0033] Thermosetting phenolic resin and polymethylsilazane were selected as raw materials for preparing polysilazane-modified phenolic resin. First, the thermosetting phenolic resin underwent fine pretreatment. The resin was then spread evenly on a drying tray, with the thickness controlled within 2 cm to avoid uneven drying due to excessive thickness. The tray was then placed in a drying device, set to 70℃, and dried continuously for 2.5 hours. During drying, good hot air circulation was ensured within the drying device to guarantee uniform heating of all parts of the phenolic resin. After drying, the tray was removed from the drying device and quickly placed in a dry environment to cool to room temperature. During cooling, the phenolic resin was prevented from contacting humid air to avoid moisture absorption and affecting the subsequent grafting reaction. The cooled thermosetting phenolic resin and polymethylsilazane were accurately weighed at a weight ratio of 4:1 and separately placed in sealed containers for later use. Accuracy was ensured during weighing to avoid ratio deviations.

[0034] Slowly add the weighed thermosetting phenolic resin into the nitrogen-protected reactor. After adding the resin, close the reactor's sealed inlet valve and check the reactor's sealing performance to ensure there is no leakage. Turn on the reactor's ventilation device and introduce nitrogen into the reactor through a dedicated pipeline. The nitrogen ventilation rate should be stably controlled at 0.7 cubic meters per hour, and continuous ventilation should last for 35 minutes to ensure that the air inside the reactor is completely replaced by nitrogen, ensuring that the grafting reaction takes place in an oxygen-free environment. Turn on the reactor's temperature control device and stirring device. Initially adjust the stirring paddle speed to 100 revolutions per minute, and gradually adjust the reactor temperature to 135°C at a uniform heating rate of 7°C per minute. Once the set temperature is reached, maintain the temperature control device stably, keeping the reactor temperature within the range of 135°C ± 1°C. After the temperature stabilizes, turn on the polymethylsilazane dripping device and add the polymethylsilazane into the reactor at a uniform rate through the high-temperature resistant dripping pipeline. The dripping rate is controlled at 8 ml per minute. During the dripping process, nitrogen gas is continuously introduced, and the temperature and stirring rate inside the reactor are kept stable. At the same time, observe the discharge status of the dripping pipeline to avoid dripping blockage or sudden changes in the dripping rate.

[0035] After the polymethylsilazane was added dropwise, the stirring speed of the reactor was increased from 100 rpm to 260 rpm, maintaining a constant temperature of 135℃±1℃ for 2.5 hours for the grafting reaction. During the reaction, a designated person monitored the temperature and pressure changes inside the reactor in real time, recording data every 15 minutes to ensure a stable reaction environment. If temperature or pressure fluctuations occurred, adjustments were made promptly using the temperature control and ventilation devices. After the grafting reaction was completed, the heating device of the reactor was turned off, and the stirring paddle was kept at a low speed of 60 rpm to allow the material inside the reactor to cool naturally to room temperature. During the cooling process, nitrogen gas was continuously introduced at a rate of 0.7 cubic meters per hour to prevent oxidation and other side reactions caused by contact with air during cooling. After the material has completely cooled to room temperature, open the discharge door of the reactor and slowly remove the obtained polysilazane-modified phenolic resin. Immediately pack it into a sealed plastic bucket, seal it tightly, and store it in a dry and ventilated environment for later use. This polysilazane-modified phenolic resin is a viscous solid at 25°C, with a viscosity ranging from 5000 to 10000 mPa·s. It has a uniform texture and is free of impurities. Figure 2 As shown.

[0036] S2, Dry material homogenization:

[0037] According to the determined weight proportions, anhydrous sodium borate, silicon nitride micro powder, encapsulated microcapsule foaming agent, black silicon carbide, micro-expanded flake graphite, suspending agent, and anti-slag additive were accurately weighed using a high-precision weighing device. Each material was individually placed into a drying container after weighing and clearly labeled to avoid material confusion. Each type of dry material underwent refined pretreatment to thoroughly remove impurities and moisture, ensuring effective subsequent mixing. The anhydrous sodium borate, silicon nitride micro powder, black silicon carbide, micro-expanded flake graphite, and anti-slag additive were then placed together in the drying tray of the drying equipment. The materials were spread evenly, with the thickness controlled within 2 cm. The drying temperature was set to 110℃, and the drying equipment was turned on continuously for 5 hours. During the drying process, hot air circulation was ensured to allow the materials to be heated evenly and to remove adsorbed moisture. After drying, the drying tray was removed and allowed to cool naturally to room temperature in a dry environment, ensuring that the moisture content of each dry material met the requirements for subsequent mixing. The encapsulated microcapsule foaming agent is placed in a special sieve for sieving. During the sieving process, the foaming agent is slowly turned over to carefully remove the clumps of particles that have formed due to storage, ensuring that the foaming agent particles are intact. The sieved foaming agent is then placed in a dry container for later use.

[0038] Slowly add all pretreated dry materials into the high-speed mixer. After adding the materials, close the sealed inlet of the mixer and check the sealing and stirring systems. Turn on the stirring device of the high-speed mixer and adjust the stirring speed to 1700 rpm. Maintain this speed for 13 minutes. During the mixing process, use the built-in wall scraping device to continuously scrape the inner wall of the mixer to prevent the dry materials from adhering to the inner wall and causing uneven mixing. At the same time, observe the mixing state of the materials in the mixer to ensure that the materials are in a uniform suspension mixing state. After mixing is complete, turn off the stirring device, open the outlet of the mixer, and slowly remove the mixed dry materials. Sieve them again through a special screen to further remove any small lumps generated during the mixing process due to material friction. Finally, a non-oxide dry material mixture with uniform composition and uniform particle dispersion is obtained. Store it in a sealed drying silo in a dry environment for later use to prevent moisture absorption and clumping. Figure 3 As shown.

[0039] S3, Liquid-solid pulping:

[0040] A vertical high-speed pulper with a wall-scraping function was selected as the pulping equipment. Before pulping, the internal cavity, stirring paddle, and wall-scraping device of the pulper were thoroughly cleaned. The inside of the cavity was wiped with a dry cloth to ensure that there were no residual impurities or moisture, so as not to affect the subsequent pulp performance. After cleaning, the non-oxide dry material mixture prepared above was slowly added into the cavity of the pulper. During the feeding process, material clumping was avoided. After feeding, the low-speed stirring function of the pulper was turned on, and the stirring speed was adjusted to 550 rpm to keep the dry material in a loose suspended state in the pulper and prevent material settling and clumping.

[0041] The sealed, pre-prepared polysilazane-modified phenolic resin and nano-silicon carbide sol were added to the pulping machine according to the specified ratio. A differentiated and precise addition method was used during the process to ensure full contact between the materials. The polysilazane-modified phenolic resin was slowly and uniformly added along the inner wall of the pulping machine through a dedicated dripping pipeline. The dripping rate was controlled to ensure that the resin adhered evenly to the surface of the dry material, avoiding excessive resin in certain areas that could cause material agglomeration. The nano-silicon carbide sol was added to the pulping machine through a high-pressure atomizing device, atomizing the sol into tiny droplets, allowing the sol to fully and uniformly contact the dry material in a mist-like form. Simultaneously with the addition of the liquid phase materials, metallurgical hot-quenching circulating water was added to the pulping machine. The initial water addition was strictly controlled to 70% of the total water volume, reserving adjustment space for subsequent water replenishment based on the material's condition. The water addition process was slow and uniform to avoid water flow impact causing the dry material to clump.

[0042] After all the liquid phase material has been added, increase the stirring speed of the pulper from 550 rpm to 900 rpm for medium-speed stirring for 7 minutes to allow the liquid phase and dry material to fully and initially mix. During the mixing process, observe the state of the material in the pulper every 2 minutes to ensure that there are no obvious dry powder lumps. If local lumps appear, extend the stirring time appropriately until the lumps are completely dispersed. After the initial mixing is complete, add the remaining 30% of the metallurgical hot quenching circulating water evenly to the pulper in 4 batches. The amount of water added in each batch is equal. After each batch of water is added, maintain medium-speed stirring at 900 rpm for 1 minute to allow the water and material to mix thoroughly, avoiding local slurries that are too thin or too thick, and ensuring that the overall texture of the slurry is uniform.

[0043] After all water was added, the stirring speed of the pulper was increased from 900 rpm to 3000 rpm, and the high-speed stirring mode was activated for 18 minutes. During the high-speed stirring process, a constant temperature medium was introduced into the jacket of the pulper through the jacket temperature control device to stabilize the temperature of the material inside the machine within the range of 30℃±1℃. This prevented the material temperature from becoming too high due to the heat generated by high-speed stirring, which could damage the performance of the polysilazane-modified phenolic resin and the core-shell structure of the encapsulated microcapsule foaming agent. During the high-speed stirring process, the material was sampled and tested every 4 minutes using a special sampler taken from the middle of the pulper cavity to test the volume density and viscosity of the slurry. Based on the test results, the amount of water added was slowly and finely adjusted until the volume density of the slurry was precisely controlled to 1.25 g / cm³ and the viscosity to 23 saturation seconds, meeting the performance standards for slurry preparation.

[0044] After high-speed mixing is complete, immediately shut off all agitation and temperature control devices in the pulping machine. Allow the pulp in the machine to settle and degas for 2.5 minutes. During this settling process, keep the pulping machine completely sealed, without any additional stirring, vibration, or shaking. Allow the tiny air bubbles in the pulp to escape naturally, ensuring no air bubbles remain. After settling and degassing, a uniform spray coating is obtained. Immediately open the pulping machine's outlet and quickly transfer the spray coating to a dedicated storage tank via a dedicated guide pipe. Avoid leaving any residue in the pipes during the transfer process to ensure complete transfer of the pulp. The dedicated slurry storage tank is equipped with a thermostatic jacket and an anchor-type agitator. After transfer, a thermostatic medium is introduced into the jacket to stabilize the slurry temperature at 25℃±1℃. The anchor-type agitator is then turned on and continuously stirred at a low speed of 65 revolutions per minute. Subsequently, designated personnel regularly test the slurry's bulk density and viscosity every 2 hours, making timely and targeted adjustments to any fluctuations in performance to ensure the slurry always meets the requirements for spraying. Figure 4 As shown.

[0045] Example 2:

[0046] Optimization of preparation process and performance testing of polysilazane-modified phenolic resin.

[0047] This embodiment focuses on the single-factor optimization study of the preparation process of polysilazane-modified phenolic resin, and examines the influence of two core process parameters, reaction temperature and stirring rate, on the final performance of the modified resin. The raw materials used in the experiment were all thermosetting phenolic resin and polymethylsilazane of the same batch and specifications, and were strictly proportioned according to a weight ratio of 4:1. All other preparation process parameters were kept completely consistent. By setting different experimental groups, the core process parameters were optimized and screened, and the modified resin products obtained in each group were comprehensively tested to determine the optimal preparation process parameters.

[0048] Experimental raw material pretreatment:

[0049] Thermosetting phenolic resin and polymethylsilazane from the same batch were selected to ensure consistency in raw material properties. Thermosetting phenolic resin was spread evenly on a drying tray with a thickness of 2 cm, placed in the drying equipment, and dried continuously at 70℃ for 2.5 hours. After drying, it was removed and placed in a dry environment to cool to room temperature before being stored in a sealed container for later use. Polymethylsilazane was placed directly in a sealed container and stored at room temperature away from light to prevent volatilization and moisture absorption. Before use, its condition was checked to ensure that there was no stratification or solidification. Beforehand, check the aeration, temperature control, and stirring systems of the reactor to ensure normal equipment operation. Maintain consistent nitrogen purity and a stable aeration rate of 0.7 cubic meters per hour, continuously aerating for 35 minutes to complete oxygen-free replacement. Control the dropping rate of polymethylsilazane to a uniform 8 ml per minute, and preheat the dropping pipeline to prevent material from sticking to the walls. Ensure the heating rate of the reactor is 7°C per minute to guarantee uniform heating. After all groups of reactions are completed, allow natural cooling to room temperature with a stirring rate of 60 rpm, continuously purging nitrogen during the cooling process to ensure that all preparation conditions are completely consistent except for the reaction temperature and stirring rate, eliminating interference from other factors on the experimental results.

[0050] Modified resins were prepared in groups:

[0051] Four experimental groups were set up, and the grafting reaction temperature and stirring rate in the reactor were adjusted respectively. All other operation steps were strictly carried out according to the modified resin preparation process in Example 1 to complete the preparation of polysilazane-modified phenolic resin for each group. The specific process parameters for each group are set as follows:

[0052] Group 1: The grafting reaction temperature was controlled at 120℃, the stirring rate was kept constant at 200 rpm, and the grafting reaction time was 3 hours.

[0053] Group 2: The grafting reaction temperature was controlled at 130℃, the stirring rate was kept constant at 240 rpm, and the grafting reaction time was 2.7h;

[0054] Group 3: The grafting reaction temperature was controlled at 140℃, the stirring rate was kept constant at 280 rpm, and the grafting reaction time was 2.3h;

[0055] Group 4: The grafting reaction temperature was controlled at 150℃, the stirring rate was kept constant at 300 rpm, and the grafting reaction time was 2 hours.

[0056] After all materials were completely cooled to room temperature, the polysilazane-modified phenolic resin samples were taken out of the reactor and labeled as Sample 1, Sample 2, Sample 3, and Sample 4 respectively. They were immediately placed in sealed containers and kept in a constant temperature environment of 25°C for later use to avoid environmental factors affecting the performance of the samples.

[0057] Performance testing methods:

[0058] Four groups of samples were placed together in a constant temperature testing environment at 25℃ and allowed to stand for 30 minutes to allow the sample temperature to completely match the testing environment. A high-precision viscosity testing device was used to accurately measure the viscosity of each group of samples. For each group, samples were taken from three locations—top, middle, and bottom—with the same sample size each time, and viscosity was measured separately. The average of the three measurements was taken as the final resin viscosity result for that group of samples. Simultaneously, the physical morphology of each group of samples was comprehensively assessed through a combination of visual observation and tactile testing. The presence of layering, sedimentation, or particulate impurities was carefully observed. A glass rod was used to dip into the sample to assess the uniformity of the viscosity, and the test results were recorded.

[0059] Comparison of modified resin performance tests:

[0060]

[0061] Based on a comprehensive analysis of the performance test results of each group of samples, the reaction temperature and stirring rate of group 2 are the optimal process parameters for the preparation of polysilazane-modified phenolic resin. The modified resin prepared under these parameters has a moderate viscosity, is within the optimal range required by the process, has a uniform physical morphology, uniform viscosity without impurities, and its fluidity meets the requirements of the subsequent liquid-solid slurry preparation process. It can fully and uniformly blend with the non-oxide dry material mixture without local agglomeration or uneven blending, thus ensuring the overall performance of the subsequent sprayed slurry.

[0062] Example 3:

[0063] Pretreatment and performance compatibility testing of non-oxide host reinforcing phase.

[0064] This embodiment focuses on a specific study of the non-oxide-based reinforcing phase, which is a mixture of black silicon carbide and micro-expanded flake graphite at a weight ratio of 9:4. The effects of two core process parameters—drying temperature and drying time—on the particle dispersion and particle size uniformity of the reinforcing phase were investigated. All other pretreatment and mixing process parameters remained completely consistent. The reinforcing phase was prepared by setting up different experimental groups, and the performance of each group of reinforcing phases was precisely tested to screen out the optimal pretreatment process parameters, ensuring that the reinforcing phase can be fully integrated with other dry materials and improving the overall performance of the spray coating.

[0065] Preparation of reinforcing phase raw materials:

[0066] Black silicon carbide and micro-expanded flake graphite from the same batch were selected to ensure consistent initial properties of the raw materials. They were accurately weighed at a weight ratio of 9:4 using a high-precision weighing device. After weighing, the black silicon carbide and micro-expanded flake graphite from each group were placed in separate dry containers, clearly labeled to avoid material mixing, and stored in a dry environment for later use to prevent moisture absorption and the introduction of impurities. All groups underwent drying pretreatment of the black silicon carbide and micro-expanded flake graphite before mixing. After drying, they were naturally cooled to room temperature and then mixed using the same low-speed stirring equipment. The stirring rate was uniformly controlled at 800 rpm, and the stirring time was fixed at 8 minutes. After mixing, the containers were immediately sealed for later use, ensuring that all preparation conditions, except for drying temperature and time, were completely consistent to guarantee the accuracy of the experimental results.

[0067] Group preprocessing and mixing:

[0068] Four experimental groups were set up, and the temperature and time of the drying pretreatment were adjusted for each group. The black silicon carbide and micro-expanded flake graphite in each group underwent fine drying pretreatment, and then they were mixed according to a unified process to obtain non-oxide main reinforcing phase samples. The specific process parameters for each group are as follows:

[0069] Group 1: Drying temperature controlled at 100℃, continuous drying time 6 hours;

[0070] Group 2: Drying temperature controlled at 110℃, continuous drying time 5 hours;

[0071] Group 3: Drying temperature controlled at 115℃, continuous drying time 4.5h;

[0072] Group 4: Drying temperature controlled at 120℃, continuous drying time 4 hours.

[0073] During the drying pretreatment, the black silicon carbide and micro-expanded flake graphite of each group were evenly spread on the drying trays with a thickness of 2 cm to ensure smooth hot air circulation and uniform heating of the materials. After the raw materials of each group were dried, the drying trays were removed and placed in a dry environment to cool naturally to room temperature. After cooling, the two raw materials of each group were put into a high-speed mixer and stirred at a rate of 800 rpm for 8 minutes. After mixing, the samples were taken out and sample 1, sample 2, sample 3 and sample 4 were prepared in sequence and placed in sealed drying containers for later use.

[0074] Performance testing methods:

[0075] Professional particle dispersibility testing equipment was used to accurately test the dispersibility of each group of reinforcing phase samples. Five different locations were randomly selected from the container for each sample group, with the same sample size at each location. Dispersibility testing was performed on each location, and the proportion of particle agglomeration in each sample was recorded. A lower agglomeration proportion indicates better dispersibility. High-precision particle size analysis equipment was used to test the particle size of each group of samples. One hundred particles were randomly selected from each group for particle size analysis, and the particle size data for each particle was recorded. The particle size deviation value was calculated based on the test data. A smaller deviation value indicates better particle size uniformity. Each group of samples underwent three parallel tests, and the average of the three test results was taken as the final test result to ensure accuracy.

[0076] Performance comparison of non-oxide host reinforced phase:

[0077]

[0078] A comprehensive analysis of the performance test results of each group of samples revealed that the drying temperature and drying time of Group 2 were the optimal process parameters for the pretreatment of the non-oxide-based reinforcing phase. Under these parameters, the proportion of agglomerated reinforcing phase particles was the lowest, at only 2.1%, exhibiting excellent particle dispersibility. Simultaneously, the particle size deviation was minimal, at only 4 μm, demonstrating optimal particle size uniformity. Under these process parameters, the reinforcing phase can fully and uniformly integrate with other dry materials such as anhydrous sodium potassium borate and silicon nitride micropowder during subsequent dry material homogenization, preventing uneven mixing caused by particle agglomeration and ensuring the compositional uniformity of the dry material mixture. This effectively improves the overall performance of the subsequent sprayed slurry.

[0079] Example 4:

[0080] Control of core process parameters and testing of pulp properties in the liquid-solid pulping stage.

[0081] This embodiment focuses on the process optimization of the liquid-solid pulping stage, and examines the effects of two core process parameters, high-speed stirring rate and material temperature, on the volume density and viscosity of the sprayed slurry. The raw materials used in the experiment are all non-oxide dry material mixtures, polysilazane-modified phenolic resin and nano-silicon carbide sol with the same proportions as in Example 1. Among them, the polysilazane-modified phenolic resin is the product prepared by the optimal process in Example 2 to ensure the consistency of raw material performance. All other pulping process parameters are kept completely consistent. The preparation of sprayed slurry is completed by setting different experimental groups, and the basic performance of each group of slurry is tested to determine the optimal process parameters of the liquid-solid pulping stage.

[0082] Preparation of raw materials and basic processes for pulping:

[0083] The polysilazane-modified phenolic resin prepared using the optimal process in Example 2 and the non-oxide main reinforcing phase prepared using the optimal process in Example 3 were selected. All pulping raw materials were accurately weighed using a high-precision weighing device according to the weight ratio determined in Example 1. Each raw material was weighed separately and clearly labeled to avoid proportioning deviations. All raw materials underwent pretreatment according to the process in Example 1. The non-oxide dry mixture was ensured to be homogeneous and free of lumps. The polysilazane-modified phenolic resin was preheated in a constant temperature environment of 25°C to ensure droplet flowability. The nano-silicon carbide sol was checked in advance to ensure no stratification or sedimentation. The same vertical high-speed pulping machine with a wall scraping function was used, and all materials underwent thorough cleaning and drying before pulping. The basic process parameters for pulping are uniformly set as follows: low-speed stirring rate is 550 rpm, medium-speed stirring rate is 900 rpm, medium-speed stirring time is fixed at 7 min, the initial addition ratio of metallurgical hot quenching circulating water is 70%, the remaining water is added in 4 batches, and the settling and degassing time is fixed at 2.5 min. This ensures that, except for the high-speed stirring rate and material temperature, all other pulping process parameters are completely consistent, eliminating interference from other factors on the pulp performance.

[0084] Preparation of spray slurry in groups:

[0085] Four experimental groups were set up, and the high-speed stirring rate and material temperature during the pulping process were adjusted respectively. All other operation steps were strictly carried out according to the liquid-solid pulping process in Example 1 to complete the preparation of the sprayed slurry for each group. The specific process parameters for each group are set as follows:

[0086] Group 1: High-speed stirring rate is kept stable at 3000 rpm, material temperature is controlled at 25℃, and high-speed stirring time is 20 min;

[0087] Group 2: The high-speed stirring rate is kept stable at 3000 rpm, the material temperature is controlled at 30℃, and the high-speed stirring time is 18 min;

[0088] Group 3: High-speed stirring rate is maintained at 3000 rpm, material temperature is controlled at 35℃, and high-speed stirring time is 15 min;

[0089] Group 4: High-speed stirring rate is stable at 2800 rpm, material temperature is controlled at 30℃, and high-speed stirring time is 18 min.

[0090] After each group completed the static degassing treatment, spray slurry samples were prepared and labeled as Sample 1, Sample 2, Sample 3, and Sample 4 in sequence. All samples were immediately transferred to a dedicated slurry storage tank of the same specification through a dedicated pipeline and stored in a constant temperature environment of 25°C. After the transfer was completed, performance testing was carried out in a timely manner to avoid changes in the slurry properties.

[0091] Performance testing methods:

[0092] Four groups of sprayed slurry samples were placed together in a constant temperature testing environment at 25℃ and allowed to stand for 20 minutes to ensure the slurry temperature was completely consistent with the testing environment. The volumetric density of each group of slurries was accurately measured using the density bottle method. For each group, 50 ml samples were taken from three locations (top, middle, and bottom) of the slurry storage tank for each measurement. The average of the three measurements was taken as the final volumetric density result for that group of samples. The viscosity of each group of slurries was measured using the coating cup method. Using the same size coating cup, samples were taken from three locations (top, middle, and bottom) of the slurry storage tank for each group of samples. The outflow time of the slurry was measured for each location, and the outflow time was used as the viscosity index. The average of the three measurements was taken as the final viscosity result for that group of samples, ensuring the accuracy of the test results.

[0093] Comparison of basic performance tests of sprayed slurry:

[0094]

[0095] A comprehensive analysis of the performance test results of each group of samples revealed that the high-speed stirring rate and material temperature of Group 2 were the optimal process parameters for the liquid-solid slurry preparation stage. Under these parameters, the volume density of the spray slurry prepared was 1.25 g / cm³, and the viscosity was 23 seconds. Both indicators were within the optimal range required by the process. The slurry was uniform in texture, free of bubbles and lumps, and had moderate fluidity. This slurry performance ensured good atomization and uniform coating thickness during slag can spraying. After spraying, the slurry quickly adhered to the inner wall of the slag can without sagging or accumulation. Simultaneously, it ensured the adhesion and density of the coating after spraying, meeting the actual usage requirements for slag can spraying.

[0096] Example 5:

[0097] Structural parameters of encapsulated microcapsule foaming agents and testing of foaming performance of spray coatings.

[0098] This embodiment focuses on a specific study of encapsulated microcapsule foaming agents, specifically examining the impact of two core structural parameters—wall material type and core proportion—on the foaming performance of spray coatings. All raw materials used in the experiment were selected from those used in Example 1, except for the encapsulated microcapsule foaming agent, and all raw materials were products prepared using the optimal process at each stage to ensure consistent raw material performance. Only the encapsulated microcapsule foaming agent with different structural parameters was replaced. Non-oxide composite reinforced slag can spray coatings were prepared according to the complete process of Example 1, with different experimental groups set up. After preparation, the foaming performance of each group of spray coatings was precisely tested to determine the optimal foaming agent structural parameters.

[0099] Preparation of experimental materials and processes:

[0100] According to the weight ratio determined in Example 1, all raw materials except for the encapsulated microcapsule foaming agent were accurately weighed using a high-precision weighing device. Each raw material was selected as the product prepared using the optimal process at each stage: the polysilazane-modified phenolic resin was the optimal product of Example 2, the non-oxide main reinforcing phase was the optimal product of Example 3, and anhydrous potassium sodium borate, silicon nitride micro powder, etc., were all pretreated according to the pretreatment process of Example 1 to ensure that the performance of all raw materials was optimal and that the performance of each group of raw materials was completely consistent. Following the complete preparation process of Example 1, the modified resin preparation, dry material homogenization, and liquid-solid slurry preparation were completed sequentially. Only during the dry material homogenization stage were encapsulated microcapsule foaming agents with different structural parameters added to each group. All foaming agents underwent pre-screening to remove agglomerated particles. All other preparation process parameters were strictly performed according to the requirements of Example 1, and each group remained completely consistent, ensuring that there were no differences in preparation conditions except for the foaming agent structural parameters, thus ensuring that the experimental results could truly reflect the influence of the foaming agent structural parameters on the foaming performance of the spray coating.

[0101] Group preparation of spray coating:

[0102] Four experimental groups were set up, each using encapsulated microcapsule foaming agents with different wall material types and core ratios. The overall particle size of the foaming agents was uniformly controlled at 70 μm, and the wall material thickness was uniformly controlled at 3 μm. Only the wall material type and core ratio were adjusted. Non-oxide composite reinforced slag can spray coatings were prepared according to the complete process. The specific structural parameters of the foaming agents in each group are set as follows:

[0103] Group 1: The wall material is fumed silica, and the core accounts for 40% of the total weight of the foaming agent;

[0104] Group 2: The wall material is fumed silica, and the core accounts for 50% of the total weight of the foaming agent;

[0105] Group 3: The wall material is lightweight calcium carbonate, and the core accounts for 50% of the total weight of the foaming agent;

[0106] Group 4: The wall material is lightweight calcium carbonate, and the core accounts for 60% of the total weight of the foaming agent.

[0107] Each group completed the preparation of the spray coating according to the complete process of Example 1. The obtained spray coating slurry was transferred to a special storage tank for constant temperature storage and was labeled as Sample 1, Sample 2, Sample 3 and Sample 4 in sequence. The foaming performance of each group of samples was tested in a timely manner.

[0108] Performance testing methods:

[0109] Four groups of spray coating samples were placed in the same constant-temperature heating environment and heated to the optimal temperature for the foaming reaction at a uniform heating rate of 5℃ per minute. This temperature was maintained until the foaming reaction was completely completed, after which heating was stopped and the samples were allowed to cool naturally to room temperature. The microstructure of each group of spray coatings after foaming was observed using a high-magnification microscope. The microscope magnification was uniformly set to 200x. Five different observation points were selected for each group of samples. At each observation point, the pore diameter of 50 foamed pores was randomly counted, and the average foamed pore diameter was calculated. At the same time, the distribution of foamed pores at each observation point was observed. According to the uniformity of foamed pores, they were divided into three levels: excellent, good, and medium. Excellent indicates that the foamed pores are evenly distributed without uneven density. Good indicates that the foamed pores are evenly distributed overall with slight uneven density in some areas. Medium indicates that the foamed pores are unevenly distributed with obvious agglomeration or empty areas. The combined result of the five observation points was taken as the final foaming uniformity level of the group of samples.

[0110] Comparison of foaming performance tests for spray coatings:

[0111]

[0112] A comprehensive analysis of the foaming performance test results of each group of samples revealed that the encapsulated microcapsule foaming agent in Group 2 had the optimal structural parameters. Under these parameters, the foaming agent wall material is fumed silica, with a core content of 50%, enabling the spray coating to achieve optimal foaming effect. The average foam pore size is 75μm, a moderate size that meets the foaming requirements of slag pot spray coatings. Furthermore, the foaming uniformity is excellent, with the foam pores evenly distributed throughout the coating without uneven density. This foaming effect effectively improves the thermal insulation and slag resistance of the slag pot spray coating, reduces the erosion and heat conduction of the slag pot's inner wall by high-temperature molten slag, and extends the service life of the slag pot, fully meeting the requirements for high-temperature operation of slag pots.

[0113] Example 6:

[0114] Storage process and performance stability testing of sprayed slurry.

[0115] This embodiment focuses on the storage process of sprayed slurry, specifically examining the effects of two core parameters—storage temperature and stirring rate—on the stability of the slurry's performance after storage. The sprayed slurry used in the experiment was prepared using the optimal process described in Example 1. The initial basic properties of the slurry were a bulk density of 1.25 g / cm³, a viscosity of 23 seconds, and a uniform texture free of bubbles, stratification, and sedimentation. Different experimental groups were set up, and the slurry was stored using different storage processes for 72 hours in each group. After storage, comprehensive performance testing was conducted on each group of slurry to analyze the changes in slurry performance and determine the optimal storage process parameters.

[0116] Sample storage and equipment preparation:

[0117] The spray slurry prepared using the optimal process in Example 1 was divided into four equal portions using a high-precision metering device. Each portion had a volume of 50 liters and all portions had identical initial basic properties: a bulk density of 1.25 g / cm³, a viscosity of 23 seconds, and a uniform texture, free of bubbles, stratification, and sedimentation. The four portions were slowly transferred to four identical dedicated storage tanks via dedicated conduits. The flow rate was controlled during the transfer to prevent the formation of new bubbles. After the transfer, the state of the slurry in the storage tanks was checked to ensure there were no bubbles or stratification. All four dedicated storage tanks were equipped with identical temperature-controlled jackets and anchor-type stirring paddles. Before use, all tanks underwent thorough cleaning and drying to ensure no residual impurities or moisture, guaranteeing consistency in storage equipment. Different storage temperatures and stirring rates were set for each group, with a uniform storage time of 72 hours. No other operations were performed during storage; only constant temperature and low-speed stirring were maintained according to the set parameters.

[0118] Group storage of spray slurry:

[0119] Four experimental groups were set up, and the storage temperature of the slurry tank and the stirring rate of the anchor-type agitator were adjusted respectively, while other storage conditions remained the same. The sprayed slurry of each group was stored at a constant temperature and low speed with stirring for 72 hours. The specific storage process parameters for each group are set as follows:

[0120] Group 1: The storage temperature is stably controlled at 20℃±1℃ by a constant temperature jacket, and the stirring rate of the anchor-type stirring paddle is stably 50 revolutions per minute;

[0121] Group 2: The storage temperature is stably controlled at 25℃±1℃ by a constant temperature jacket, and the stirring rate of the anchor-type stirring paddle is stably 65 revolutions per minute;

[0122] Group 3: The storage temperature is stably controlled at 30℃±1℃ by a constant temperature jacket, and the stirring rate of the anchor-type stirring paddle is stably 80 revolutions per minute;

[0123] Group 4: The storage temperature is stably controlled at 35℃±1℃ by a constant temperature jacket, and the stirring rate of the anchor-type agitator is stably 65 revolutions per minute.

[0124] During storage, a designated person observes the appearance of each group of slurry every 12 hours, recording whether phenomena such as stratification, sedimentation, or clumping occur. If any abnormalities are found, they are recorded in a timely manner. After the 72-hour storage period, a comprehensive performance test is conducted on each group of slurry.

[0125] Performance testing methods:

[0126] Four groups of slurries that had undergone 72 hours of storage were placed together in a constant-temperature testing environment at 25°C and allowed to stand for 30 minutes to ensure the slurry temperature was completely consistent with the testing environment. Using the same testing methods and equipment as in Example 4, the volumetric density and viscosity of each group of slurries were precisely measured. Samples were taken from three locations—top, middle, and bottom—of each storage tank, and the volumetric density and viscosity were measured for each location. The average of the three measurements was taken as the volumetric density and viscosity values ​​of the stored slurry. Simultaneously, the appearance of the slurry was directly observed with the naked eye, and any phenomena such as stratification, sedimentation, clumping, or bubbles were carefully recorded. Based on the test results, the rate of change of volumetric density and viscosity for each group of slurries was calculated. The formula for the rate of change is: Rate of change = (Initial value - Value after storage) / Initial value × 100%. A lower rate of change indicates better performance stability of the slurry.

[0127] Comparison of stability test results for storage performance of sprayed slurry:

[0128]

[0129] A comprehensive analysis of the storage performance stability test results of each group of samples revealed that the storage temperature and stirring rate of Group 2 were the optimal process parameters for storing the spray slurry. Under these parameters, the volume density change rate of the spray slurry after 72 hours of storage was only 0.4%, and the viscosity change rate was only 0.6%, both of which were the lowest. Furthermore, the appearance of the slurry remained completely consistent with its initial state, exhibiting no stratification, sedimentation, agglomeration, or bubbles, demonstrating excellent texture uniformity and optimal performance stability. These storage process parameters ensure that the spray slurry maintains stable performance throughout the batch storage process in industrial production, without performance fluctuations due to storage time. This fully meets the storage and use requirements of spray slurries in industrial production and is suitable for large-scale application.

[0130] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A non-oxide composite reinforced slag can spray coating, characterized in that, The coating, by weight, consists of the following components: 10-15 parts of polysilazane-modified phenolic resin, 3-5 parts of anhydrous potassium sodium borate, 2-4 parts of nano-silicon carbide sol, 2 parts of silicon nitride micro powder, 0.5-2 parts of encapsulated microcapsule foaming agent, 66-77.5 parts of non-oxide main reinforcing phase, 1-2 parts of suspending agent, and 1-2 parts of anti-slag additive; The non-oxide host reinforcing phase is composed of black silicon carbide and micro-expanded flake graphite mixed in a weight ratio of 9:

4.

2. The non-oxide composite reinforced slag can spray coating according to claim 1, characterized in that, The polysilazane-modified phenolic resin is prepared by grafting thermosetting phenolic resin and polymethylsilazane at a weight ratio of 4:

1. The thermosetting phenolic resin has a softening point of 80-100℃ and a free phenol content of ≤5wt%. The polymethylsilazane has a number average molecular weight of 1000-3000g / mol. The polysilazane-modified phenolic resin is a viscous solid at 25℃ with a viscosity of 5000-10000mPa·s.

3. The non-oxide composite reinforced slag can spray coating according to claim 1, characterized in that, The nano-silicon carbide sol is a β-crystalline silicon carbide nano-sol with a solid content of 30%-40%, a silicon carbide nanoparticle size of 20-50 nm, a sol pH of 7-9, and no alcohol dispersant; the anhydrous potassium sodium borate is a compound of potassium borate and sodium borate in a weight ratio of 1:1-2:1, with a particle size of 100-200 mesh, no water of crystallization, and a loss on ignition of ≤0.5 wt% at 800℃.

4. The non-oxide composite reinforced slag can spray coating according to claim 1, characterized in that, The encapsulated microcapsule foaming agent has a core-shell structure, with the wall material being gaseous SiO2 or light CaCO3, and the wall material thickness being 2-4 μm. The core is one of n-butane, n-pentane, or light magnesium carbonate, and the core accounts for 40%-60% of the total weight of the microcapsule. The overall particle size of the microcapsule is 50-100 μm.

5. The non-oxide composite reinforced slag can spray coating according to claim 1, characterized in that, The black silicon carbide is a 250-mesh ultrafine powder with a carbon content ≤0.5% and a free silicon content ≤0.3%; the micro-expanded flake graphite has a flake thickness of 1-5μm, a particle size of 200-325 mesh, a fixed carbon content ≥99%, and an ash content ≤0.5%; the suspending agent is fused fiber RSU with a fiber length of 10-50μm and a fiber diameter of 1-3μm; the anti-slag additive is α-crystalline alumina ultrafine powder with a particle size ≤1μm and a particle size distribution D50 of 0.3-0.5μm.

6. A method for preparing a non-oxide composite reinforced slag can spray coating, the method being used to prepare the non-oxide composite reinforced slag can spray coating according to any one of claims 1-5, characterized in that, The specific steps of this method are as follows: S1, Preparation of modified resin: Phenolic resin and polysilazane are added to a nitrogen-protected reaction vessel at a weight ratio of 4:

1. The temperature inside the vessel is adjusted to 120-150℃, and the grafting reaction is carried out at a stirring rate of 200-300r / min for 2-3h. After the reaction is completed, the mixture is naturally cooled to room temperature to obtain polysilazane-modified phenolic resin, which is then sealed for later use. S2, Dry material homogenization: Weigh anhydrous potassium sodium borate, silicon nitride micro powder, encapsulated microcapsule foaming agent, non-oxide main reinforcing phase, suspending agent, and anti-slag additive according to the weight parts, put all the dry materials into a high-speed mixing device and stir to mix, so as to obtain a non-oxide dry material mixture with uniform composition. S3, Liquid-Solid Pulping: Polysilazane-modified phenolic resin and nano-silicon carbide sol are added to the non-oxide dry material mixture, and metallurgical hot quenching circulating water is added. First, the mixture is stirred at a medium speed to initially fuse the liquid phase with the dry materials. Then, the stirring speed is increased to 3000 r / min for high-speed stirring. The amount of water added is adjusted to achieve a slurry bulk density of 1.2-1.3 g / cm³. 3 The viscosity is 20-25s. After stirring, the mixture is allowed to stand to remove bubbles, and a spraying slurry is obtained. The obtained spraying slurry is transferred to a special storage tank, and the slurry is continuously stirred at low speed. The volume density and viscosity of the slurry are tested regularly, and the slurry with fluctuating performance is fine-tuned accordingly.

7. The preparation method of a non-oxide composite reinforced slag can spray coating according to claim 6, characterized in that, In step S1, the phenolic resin is dried at 60-80℃ for 2-3 hours before use. The polysilazane is added to the reactor at a dropping rate of 5-10 mL / min. The nitrogen gas introduced into the reactor has a purity of ≥99.99% and a gas flow rate of 0.5-1 m. 3 The gas flow rate is 5-8℃ / min, and the continuous aeration time is no less than 30 min. During the cooling stage, the gas flow rate is maintained at 50-80 r / min and stirred until room temperature.

8. The preparation method of a non-oxide composite reinforced slag can spray coating according to claim 6, characterized in that, In step S2, the anhydrous potassium sodium borate, silicon nitride micro powder, black silicon carbide, micro-expanded flake graphite, and anti-slag additive are dried at 100-120℃ for 4-6 hours; the encapsulated microcapsule foaming agent is sieved through a screen; the stirring speed of the high-speed mixing equipment is 1500-2000 r / min and the mixing time is 10-15 min; the mixed dry material is sieved through a screen again.

9. The method for preparing a non-oxide composite reinforced slag can spray coating according to claim 6, characterized in that, In step S3, the medium-speed stirring rate for the initial fusion of the liquid phase and dry material is 800-1000 r / min, and the stirring time is 5-8 min; 70% of the total water volume of the metallurgical hot quenching circulating water is added first, and the remaining water is added in 3-5 batches; the high-speed stirring lasts for 15-20 min, and the material temperature in the pulping machine is controlled at 25-35℃ during the stirring process; the settling and degassing time is 2-3 min, and there is no additional stirring or vibration operation during the settling process.

10. The method for preparing a non-oxide composite reinforced slag can spray coating according to claim 6, characterized in that, In step S3, the special slurry storage tank is equipped with a constant temperature jacket and an anchor-type stirring paddle. The constant temperature jacket controls the slurry temperature at 20-30℃, and the stirring speed of the stirring paddle is 50-80 r / min. When the slurry viscosity is too high, metallurgical hot quenching circulating water is added along the inner wall of the slurry storage tank, and the mixture is stirred at a speed of 100-150 r / min for 1-2 minutes. The slurry is taken out from the bottom outlet of the slurry storage tank. Before taking it out, the stirring device is turned on and stirred for 5-8 minutes.

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