Ceramic composite material with excellent anti-static capability and wear resistance as well as preparation method and application of ceramic composite material

Abstract

The invention belongs to the field of textile machinery, and relates to a ceramic composite material with excellent antistatic capability and wear resistance and a preparation method thereof. According to the ceramic composite material disclosed by the invention, a proper amount of SiO2 and C powder is accurately added into the TiO2 powder, and the composite material consisting of three crystal phases of TiO2, TiC and SiC is formed under a high-temperature condition through specific process treatment, so that the wear resistance, the fracture toughness and the anti-static capability of original TiO2 ceramic are remarkably improved, and the service life of the ceramic composite material is prolonged. And the service life of the product is greatly prolonged.

Description

Technical Field

[0001] The invention belongs to the field of textile machinery and relates to a ceramic composite material with excellent antistatic ability and wear resistance and a preparation method thereof. Background Art

[0002] In the textile industry, the high-speed operation of silk threads is often accompanied by the occurrence of static electricity, which not only causes disordered entanglement of silk threads and affects the quality of the final textiles, but may also cause fire and other safety hazards due to the accumulation of static electricity to a certain extent. In order to solve these problems, the industry continues to explore the use of various materials to improve production equipment, among which ceramic materials have become the focus due to their unique physical properties. Compared with traditional metal materials, ceramic materials exhibit higher mechanical strength, hardness and wear resistance, which enables them to maintain stable performance in harsh working environments. Therefore, in modern textile equipment, more and more key components are beginning to use these high-performance ceramic materials. Specifically, Al 2 O 3 (aluminum oxide), ZrO 2 (zirconia), SrTiO 3 Ceramic wire guides such as strontium titanate (SrTiO3) have been widely used and can perform well under general application conditions.

[0003] However, despite the many advantages of the above-mentioned ceramic materials, there are still challenges in handling some special yarns. For example, in an environment where the yarn friction is strong and charge accumulation is easy to occur, the anti-static effect of these ceramic materials is poor due to their own poor conductivity, which reduces the wire guiding efficiency and shortens the service life. The root cause of such problems lies in certain inherent properties of these ceramic materials, such as high friction coefficient, extremely high resistivity, and relatively low fracture toughness and mechanical strength. The high friction coefficient means that the yarn will experience greater resistance when passing, which not only increases energy consumption, but may also cause damage to the yarn; while the high resistivity directly limits the material's conductivity, which is not conducive to the timely dissipation of the generated static electricity, thereby exacerbating static electricity-related problems. In addition, the low fracture toughness and mechanical strength limit the performance of these materials in high-intensity applications, making them incapable of facing extreme conditions.

[0004] Therefore, although current ceramic materials have made significant progress in the textile industry, in order to further improve production efficiency and product quality, the development of a new generation of ceramic materials with better conductivity, lower friction coefficient and higher mechanical strength is still an important direction of industry research.

[0005] The Chinese patent application document (publication number: CN108395242A) discloses a ceramic powder, a wire guide wheel using the powder and a preparation method thereof. However, the conventional TiO2 -BaTiO 3 Ceramic wire guide wheels made by directly sintering mixed powders cannot simultaneously have excellent wear resistance, good conductivity and anti-static properties, and therefore cannot meet the use requirements of current textile ceramic materials in harsh working environments. Therefore, it is urgent to develop in-situ reaction-synthesized multiphase ceramic composite materials that have both excellent anti-static ability and wear resistance. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems in the prior art and to provide a TiO 2 - A ceramic composite material composed of three crystalline phases of TiC-SiC with excellent antistatic ability and wear resistance.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A ceramic composite material with excellent antistatic ability and wear resistance, the ceramic composite material comprises the following raw materials in parts by weight: 80-95 parts of TiO 2 Powder, 2-8 parts SiO 2 Powder, 3-12 parts of C powder, 10-15 parts of organic binder.

[0009] In the above-mentioned ceramic composite material with excellent antistatic ability and wear resistance, TiO 2 The average particle size of the powder is 0.1-1.5μm, SiO 2 The average particle size of A powder is 0.01-0.5 μm, and the average particle size of C powder is 50-150 nm.

[0010] In the above-mentioned ceramic composite material with excellent antistatic ability and wear resistance, the organic binder mainly includes microcrystalline wax, stearic acid and oleic acid.

[0011] Preferably, the organic binder is a mixture of microcrystalline wax, stearic acid and oleic acid in a mass ratio of (5-20): (0.5-1.5): 1. In the present invention, microcrystalline wax has good adhesion and can provide sufficient adhesion for the molded body during the molding process. Stearic acid and oleic acid, as fatty acid substances, can enhance the dispersibility of the mixed powder, thereby improving fluidity and reducing friction and adhesion problems during the molding process. Microcrystalline wax gradually melts and evaporates at high temperatures, while stearic acid and oleic acid help to gradually decompose at lower temperatures, avoiding the expansion problem of the ceramic body caused by organic decomposition products that decompose too quickly. The combination of the three can control the stability of the degreasing process and ensure that the ceramic body does not have cracks or pores during the thermal degreasing process. However, the amount of addition needs to be strictly controlled. Excessive binders cannot be completely removed, and pores are formed in the ceramic body, which will lead to insufficient density of the ceramic product and reduce the strength and toughness of the ceramic material. Too little binder will result in low fluidity of the ceramic powder mixture, poor formability of the green body during hot die casting, insufficient strength of the formed green body, difficulty in demolding or green body breakage, especially during thermal degreasing, which is prone to cracking or breakage, affecting the quality of ceramic products.

[0012] The present invention also provides a method for preparing the above-mentioned ceramic composite material with excellent antistatic ability and wear resistance, the method comprising the following steps:

[0013] S1, prepare the above raw materials;

[0014] S2, TiO 2 Powder, SiO 2 The powder and C powder are mixed to obtain a mixed powder;

[0015] S3, heating and kneading the mixed powder and the binder, and then crushing them to obtain granulated materials;

[0016] S4, hot die-casting the granulated material, and then hot degreasing to obtain a green billet;

[0017] S5. The green blank is first subjected to vacuum sintering, and then subjected to sintering treatment under high pressure atmosphere conditions to obtain a dense ceramic composite material.

[0018] In the above method for preparing a ceramic composite material with excellent antistatic ability and wear resistance, step S2 is mixing and ball milling for 18-24 hours at a rotation speed of 160-200 r / min, and then ultrasonically dispersed at a power of 1500-2000 W for 10-20 minutes.

[0019] In the above-mentioned method for preparing a ceramic composite material with excellent antistatic ability and wear resistance, the heating and mixing temperature in step S2 is 60-80°C and the time is 1-4h. The present invention can greatly improve the mixing uniformity of the powder and reduce the agglomeration of the powder particles by heating and mixing at 60-80°C for 1-4h.

[0020] Preferably, the average particle size of the granulated material obtained by the crushing treatment in step S3 is 3-6 mm.

[0021] In the above-mentioned method for preparing a ceramic composite material with excellent antistatic ability and wear resistance, the hot die casting temperature in step S4 is 65-85° C. and the pressure is 1-3 atmospheres.

[0022] In the above-mentioned method for preparing a ceramic composite material with excellent antistatic ability and wear resistance, step S4 thermal degreasing is specifically: the temperature is raised from room temperature to 800-1000°C at a rate of 13°C-15 / h°C, and the thermal degreasing time is 60-80h in total. In the present invention, organic additives such as paraffin in the ceramic body can be directly removed by thermal degreasing to avoid adverse effects during the subsequent high-temperature sintering process, thereby ensuring the uniformity, structural integrity and performance stability of the final ceramic parts. However, too high a degreasing temperature will cause the ceramic body to soften or deform during the thermal degreasing process; too low a thermal degreasing temperature will result in incomplete degreasing, insufficient removal of organic matter, low body strength, and easy breakage; in addition, too low a temperature may lead to uneven temperature distribution during the thermal degreasing process, resulting in uneven organic matter residue inside the ceramic body, thereby affecting the consistency of the material.

[0023] In the above-mentioned method for preparing a ceramic composite material with excellent antistatic ability and wear resistance, step S5 sintering is specifically as follows: the green blank is first sintered at 1400-1600°C for 2-4h, and then placed in 50-100MPa high pressure argon conditions and sintered at 1350-1550°C for 2-6h.

[0024] The present invention creatively generates a small amount of fine-grained TiC conductive phase and SiC enhanced wear-resistant phase through in-situ reaction during the sintering process to form TiO 2 -TiC-SiC three-phase composite ceramic composite material. In the face-centered cubic TiC material, there are covalent bonds between Ti and C atoms, as well as metallic bonds between Ti atoms. The combination of these chemical bonds allows electrons to move freely in the crystal, thereby enhancing the electrical conductivity of TiC. SiC ceramics, as a stable compound with strong covalent bonds, has many excellent properties such as excellent wear resistance, thermal shock resistance and chemical stability. Therefore, the TiO prepared by the present invention 2 -TiC-SiC three-phase composite ceramic guide wire roller does not affect TiO 2The ceramic sintering densification significantly enhances its conductivity (antistatic ability) and wear resistance. In addition, the ceramic composite material after vacuum sintering is sintered for the second time in a high temperature and high pressure gas environment to further reduce the ceramic porosity and almost achieve complete densification, thereby further improving the TiO 2 -Breaking strength and hardness of TiC-SiC conductive ceramic guide wire rollers.

[0025] Based on the composition design and characteristics of the above-mentioned several crystal phases, the present invention adopts an appropriate amount of SiO 2 and C as added functional powders introduced into TiO 2 In the powder, by adjusting the mass ratio of each component and optimizing the preparation process parameters, a high-performance antistatic ceramic composite material with excellent wear resistance, good electrical conductivity (low volume resistivity) and high cost performance was successfully prepared.

[0026] The present invention also provides a wire guide wheel, which is made of the above-mentioned ceramic composite material.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The ceramic composite material of the present invention is prepared by 2 Accurately add the right amount of SiO to the powder 2 and C powder, and after a specific process, a TiO 2 The composite material is composed of three crystal phases, TiC and SiC. This material not only significantly improves the original TiO 2 The wear resistance, fracture toughness and anti-static ability of ceramics also greatly extend the service life of the product.

[0029] 2. C and TiO in the formula of the present invention 2 and SiO 2 In the first step of vacuum sintering, an in-situ reaction occurs to generate trace but crucial TiC conductive phase and SiC reinforcing phase. TiC, as a face-centered cubic compound, gives the composite material excellent conductivity due to the presence of internal Ti-C covalent bonds and metallic bonds between Ti atoms; while SiC is known for its excellent wear resistance, thermal shock resistance and chemical stability, providing additional mechanical strength and wear resistance for the composite material.

[0030] 3. In order to optimize the microstructure and physical properties of the material, the present invention also introduces a key step: vacuum sintering TiO 2-TiC-SiC three-phase composite conductive ceramics are subjected to high temperature and high pressure heat treatment (i.e., the second sintering). This process effectively eliminates the residual pores inside the material and greatly improves the density of the ceramics. In this way, not only the overall hardness and wear resistance of the material are enhanced, but also the mechanical strength is further improved. In addition, such a treatment method also helps to improve the anti-static ability of the material because it ensures that electrons can move more freely throughout the structure, thereby more effectively eliminating the accumulated static charge.

[0031] 4. TiO obtained by the preparation method of the present invention 2 -TiC-SiC three-phase composite conductive wear-resistant ceramic guide rollers show excellent performance. Its excellent anti-static ability, significantly improved wear resistance and greatly increased service life make it a highly competitive choice in the textile industry. This new type of ceramic guide roller can not only effectively solve the problems of poor conductivity and insufficient wear resistance in traditional ceramic materials, but also achieve a comprehensive improvement in overall performance without sacrificing other important properties. This marks an important step in the development of high-performance ceramic composite materials and provides a new solution for related industries. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0033] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate quantity restrictions, but indicate the existence of at least one. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0034] The following first describes in detail the TiO 2 -The initial composite powder used for TiC-SiC three-phase composite ceramics.

[0035] The initial powder of the conductive composite ceramic according to the embodiment of the present invention contains the following raw materials in parts by mass: 80-95 parts of TiO 2 Powder, 2-8 parts SiO 2 Powder, 3-12 parts C powder;

[0036] That is to say, the initial powder of the conductive composite ceramic of the embodiment of the present invention is TiO 2 The powder masterbatch is added with a total content of 5-20wt.% of functional powder, which includes SiO 2 Powder and C powder. Among them, the introduction of C powder can 2 The powder masterbatch reacts in situ to generate a small amount of TiC conductive phase, effectively improving the TiO 2 The electrostatic adsorption capacity and mechanical properties of ceramics; in addition, C powder can also react with SiO 2 The powder reacts in situ to generate a small amount of SiC reinforcement phase to increase the TiO 2 Wear resistance of ceramics.

[0037] Furthermore, the functional powder contains SiO 2 The average particle size of A powder is 0.1 μm, and the average particle size of C powder is 80 nm.

[0038] Experimental studies have found that adding functional powders within the above-mentioned proportion range can improve the wear resistance and anti-static ability of the conductive ceramic wire guide roller to a certain extent. If the added content is too low, the improvement of the comprehensive performance will not achieve the expected effect; if the added content is too high, it will cause TiO 2 The sintering and densification of ceramics are difficult, the overall performance is reduced, and the production cost is increased.

[0039] The particle size range of the functional powder selected in the experiment is based on a comprehensive consideration of its performance and production cost. The functional powder in the above size range has stable performance, and it has been found through experiments that it can have a high cost-effectiveness while having good comprehensive material performance. In addition, the raw materials in the above size range are widely available and low in cost, and can be purchased from many domestic powder raw material companies and reagent platforms.

[0040] The study found that the functional powder in the above size range was further adjusted in amount, for example, containing 90wt.% TiO 2 、4wt.%SiO 2 、6wt.%C, the prepared TiO 2 -The relative density of the TiC-SiC three-phase composite conductive ceramic guide wire roller is 99.8%, compared with TiO 2The performance of the single-phase ceramic guide wire roller is significantly improved in terms of density, conductivity, anti-static ability, wear resistance, fracture toughness and other mechanical properties.

[0041] The following is a detailed description of a method for preparing a conductive ceramic guide wire roller according to an embodiment of the present invention.

[0042] According to an embodiment of the present invention, a method for preparing the conductive ceramic guide wire roller comprises the following steps:

[0043] Step S1, mixing the three initial powders described in any of the above embodiments to obtain a mixed powder.

[0044] That is, firstly, TiO 2 Powder masterbatch and added functional powder (SiO 2 , C) to mix to obtain a mixed powder.

[0045] Furthermore, the step S1 comprises:

[0046] Weigh TiO 2 Powder masterbatch, and SiO as functional powder 2 powder and C powder;

[0047] The TiO 2 The powder masterbatch and the functional powder are dispersed in alcohol and firstly wet-milled, and then a high-power ultrasonic device is used to perform secondary mixing and dispersion on the slurry;

[0048] The mixed slurry is subjected to vacuum evaporation of alcohol and dried, and then sieved to obtain the mixed powder.

[0049] That is to say, weigh TiO 2 Powder, SiO 2 The A powder and C powder are then wet-milled to obtain a uniformly mixed slurry, which is then sieved to remove the agglomerated particles, and finally a mixed powder with fully uniform dispersion and basically uniform particle size is obtained.

[0050] The ball mill speed used in the wet ball milling is 160-200 r / min, and the ball milling time is 18-24 h. This process is conducive to improving the uniformity of the mixed powder, and after drying, it is not easy to agglomerate.

[0051] Step S2, heating, stirring and kneading the mixed powder, microcrystalline wax, stearic acid and oleic acid, cooling to obtain a block material, crushing the block material into 3-6 mm particles by a jaw crusher inlaid with a ceramic plate, that is, obtaining hot press casting pellets.

[0052] Furthermore, in step S2, the mixing temperature and mixing time of microcrystalline paraffin, stearic acid and oleic acid are 60-80°C and 1-4h respectively; the microcrystalline paraffin was purchased from Sinopec Shanghai Gaoqiao Petrochemical Co., Ltd., and the model is 58 semi-refined microcrystalline paraffin.

[0053] Step S3, hot die casting the granular material crushed by the jaw crusher to obtain a composite ceramic wire guide roller blank containing an organic binder (microcrystalline wax, stearic acid, oleic acid);

[0054] Furthermore, in the step S3, the block material after heating, mixing and cooling is crushed into granules of about 3-6 mm by a jaw crusher inlaid with a ceramic plate;

[0055] Step S4, placing the formed guide wire roller blank into a degreasing furnace for thermal degreasing to obtain a binder-free ceramic guide wire roller blank;

[0056] Furthermore, in step S4, the maximum temperature of thermal degreasing is 800-1000°C, and the degreasing time and heat preservation time required to rise from room temperature to the degreasing temperature are 60-80h in total;

[0057] Step S5, heating the ceramic guide wire roller blank without a binder in a vacuum sintering furnace and keeping the temperature at 1400-1600° C. for 2-4 hours to obtain a ceramic guide wire roller sintered body;

[0058] That is to say, after obtaining the degreased ceramic green body, it is subjected to vacuum sintering, specifically, the temperature can be kept at 1400-1600° C. for 2-4 hours to obtain a ceramic guide wire roller sintered body.

[0059] Further, as a specific sintering system, step S5 may include:

[0060] Placing a ceramic wire guide roller blank without a binder in a vacuum sintering furnace;

[0061] Then the temperature is raised to 1400-1600°C over 16-20h;

[0062] Keep warm at 1400-1600℃ for 2-4h;

[0063] After the insulation is completed, it takes 12-18 hours to cool to room temperature.

[0064] Step S6, placing the ceramic guide wire roller sintered body in a high pressure furnace, and performing a second sintering treatment for 4-6 hours at a temperature range of 1350-1550°C and an argon pressure of 50-100 MPa to obtain the dense TiO 2 -TiC-SiC three-phase composite conductive ceramic guide wire roller.

[0065] That is to say, after vacuum sintering, a second sintering is carried out in a high pressure furnace. The second sintering process is beneficial to further eliminate the pores inside the ceramic and improve the density and material properties.

[0066] Specifically, in step S6, the argon gas pressure in the high pressure furnace is maintained at 50-100 MPa.

[0067] In addition, after the secondary sintering in the high pressure furnace, the following steps may also be included:

[0068] Step S7, vibrating and polishing the ceramic wire guide roller obtained in step S6 to obtain the TiO 2 The final product is anti-static ceramic guide roller.

[0069] The TiO 2 -TiC-SiC three-phase composite conductive ceramic guide wire roller products have excellent mechanical properties, strong anti-static ability and long service life.

[0070] The TiO2 of the present invention is further described in detail below through specific examples. 2 -Preparation method of TiC-SiC three-phase composite ceramic guide wire roller.

[0071] Example 1

[0072] S1, prepare the raw materials according to the following mass fractions: 95 parts TiO 2 Powder masterbatch (TiO 2 The average particle size is 0.5 μm), 2 parts SiO 2 Powder (SiO 2 The average particle size is 0.1 μm), 3 parts of C powder (the particle size of C powder is 80 nm), and 13 parts of organic binder (microcrystalline wax: stearic acid: oleic acid in a mass ratio of 12:1:1);

[0073] S2, TiO 2 Powder, SiO 2 The powder and C powder were dispersed in alcohol and wet-milled by a ball mill, wherein the ball milling speed was 180 r / min and the ball milling time was 21 h. A high-power ultrasonic instrument was used to perform secondary ultrasonic mixing and dispersion on the slurry after ball milling, and ultrasonic dispersion was performed at a power of 2000 W for 15 min.

[0074] S3, the powder slurry after ultrasonic dispersion is dried and sieved, and then it is stirred and kneaded with an organic binder in a heating barrel, and kneaded at a temperature of 70° C. for 3 hours. The block material after heating, kneading and cooling is crushed into granular material with an average particle size of 4.5 mm by a jaw crusher inlaid with a ceramic plate to obtain a granulated material;

[0075] S4, using a hot die casting machine to perform hot die casting molding on the granulated material, the molding temperature is 75° C., and the pressure is 2 atmospheres, to obtain a green body containing an organic binder;

[0076] S5. Performing thermal degreasing treatment on the body containing organic binder (microcrystalline wax, stearic acid and oleic acid) to obtain a green body, so as to remove the organic binder in the ceramic body. The degreasing temperature is 900° C., and the temperature is increased from room temperature to 900° C. at a rate of 13° C. / h. The heating time and the holding time are 70 hours in total.

[0077] S6. Place the green blank in a vacuum sintering furnace, then heat it to 1500℃ for 18h, keep it at this temperature for 3h, and cool it to room temperature after 10h. Place the vacuum sintered sample in a high pressure furnace and perform a second sintering heat treatment at 1450℃ for 4h, with the argon gas pressure in the furnace maintained at 75MPa.

[0078] Finally, the ceramic composite material product after the second sintering treatment was placed in a vibration polishing machine. The polishing medium in the polishing machine was diamond sand and pure water. After vibration polishing for 30 hours, the polished ceramic guide wire roller was ultrasonically cleaned and dried to obtain TiO 2 -The final product is TiC-SiC three-phase composite conductive ceramic guide wire roller.

[0079] Embodiment 2:

[0080] S1, prepare the raw materials according to the following mass fractions: 90 parts TiO 2 Powder masterbatch (TiO 2 The average particle size is 0.5 μm), 4 parts SiO 2 Powder (SiO 2 The average particle size is 0.1 μm), 6 parts of C powder (the particle size of C powder is 80 nm), and 13 parts of organic binder (microcrystalline wax: stearic acid: oleic acid in a mass ratio of 12:1:1);

[0081] S2, TiO 2 Powder, SiO 2 The powder and C powder were dispersed in alcohol and wet-milled by a ball mill, wherein the ball milling speed was 180 r / min and the ball milling time was 21 h. A high-power ultrasonic instrument was used to perform secondary ultrasonic mixing and dispersion on the slurry after ball milling, and ultrasonic dispersion was performed at a power of 2000 W for 15 min.

[0082] S3, the powder slurry after ultrasonic dispersion is dried and sieved, and then it is stirred and kneaded with an organic binder in a heating barrel, and kneaded at a temperature of 70° C. for 3 hours. The block material after heating, kneading and cooling is crushed into granular material with an average particle size of 4.5 mm by a jaw crusher inlaid with a ceramic plate to obtain a granulated material;

[0083] S4, using a hot die casting machine to perform hot die casting molding on the granulated material, the molding temperature is 75° C., and the pressure is 2 atmospheres, to obtain a green body containing an organic binder;

[0084] S5. Performing thermal degreasing treatment on the body containing organic binder (microcrystalline wax, stearic acid and oleic acid) to obtain a green body, so as to remove the organic binder in the ceramic body. The degreasing temperature is 900° C., and the temperature is increased from room temperature to 900° C. at a rate of 13° C. / h. The heating time and the holding time are 70 hours in total.

[0085] S6. Place the green blank in a vacuum sintering furnace, then heat it to 1500℃ for 18h, keep it at this temperature for 3h, and cool it to room temperature after 10h. Place the vacuum sintered sample in a high pressure furnace and perform a second sintering heat treatment at 1450℃ for 4h, with the argon gas pressure in the furnace maintained at 75MPa.

[0086] Finally, the ceramic composite material product after the second sintering treatment was placed in a vibration polishing machine. The polishing medium in the polishing machine was diamond sand and pure water. After vibration polishing for 30 hours, the polished ceramic guide wire roller was ultrasonically cleaned and dried to obtain TiO 2 -The final product is TiC-SiC three-phase composite conductive ceramic guide wire roller.

[0087] Embodiment 3:

[0088] S1, prepare the raw materials according to the following mass fractions: 85 parts TiO 2 Powder masterbatch (TiO 2 The average particle size is 0.5 μm), 6 parts SiO 2 Powder (SiO 2 Average particle size is 0.1 μm), 9 parts of C powder (C powder particle size is 80 nm), 13 parts of organic binder (microcrystalline wax: stearic acid: oleic acid in a mass ratio of 12:1:1);

[0089] S2, TiO 2 Powder, SiO 2 The powder and C powder were dispersed in alcohol and wet-milled by a ball mill, wherein the ball milling speed was 180 r / min and the ball milling time was 21 h. A high-power ultrasonic instrument was used to perform secondary ultrasonic mixing and dispersion on the slurry after ball milling, and ultrasonic dispersion was performed at a power of 2000 W for 15 min.

[0090] S3, the powder slurry after ultrasonic dispersion is dried and sieved, and then it is stirred and kneaded with an organic binder in a heating barrel, and kneaded at a temperature of 70° C. for 3 hours. The block material after heating, kneading and cooling is crushed into granular material with an average particle size of 4.5 mm by a jaw crusher inlaid with a ceramic plate to obtain a granulated material;

[0091] S4, using a hot die casting machine to perform hot die casting molding on the granulated material, the molding temperature is 75° C., and the pressure is 2 atmospheres, to obtain a green body containing an organic binder;

[0092] S5. Performing thermal degreasing treatment on the body containing organic binder (microcrystalline wax, stearic acid and oleic acid) to obtain a green body, so as to remove the organic binder in the ceramic body. The degreasing temperature is 900° C., and the temperature is increased from room temperature to 900° C. at a rate of 13° C. / h. The heating time and the holding time are 70 hours in total.

[0093] S6. Place the green blank in a vacuum sintering furnace, then heat it to 1500℃ for 18h, keep it at this temperature for 3h, and cool it to room temperature after 10h. Place the vacuum sintered sample in a high pressure furnace and perform a second sintering heat treatment at 1450℃ for 4h, with the argon gas pressure in the furnace maintained at 75MPa.

[0094] Finally, the ceramic composite material product after the second sintering treatment was placed in a vibration polishing machine. The polishing medium in the polishing machine was diamond sand and pure water. After vibration polishing for 30 hours, the polished ceramic guide wire roller was ultrasonically cleaned and dried to obtain TiO 2 -The final product is TiC-SiC three-phase composite conductive ceramic guide wire roller.

[0095] Embodiment 4:

[0096] S1, prepare the raw materials according to the following mass fractions: 80 parts TiO 2 Powder masterbatch (TiO 2 The average particle size is 0.5 μm), 8 parts SiO 2 Powder (SiO 2 The average particle size is 0.1 μm), 12 parts of C powder (the particle size of C powder is 80 nm), and 13 parts of organic binder (microcrystalline wax: stearic acid: oleic acid in a mass ratio of 12:1:1);

[0097] S2, TiO 2 Powder, SiO 2 The powder and C powder were dispersed in alcohol and wet-milled by a ball mill, wherein the ball milling speed was 180 r / min and the ball milling time was 21 h. A high-power ultrasonic instrument was used to perform secondary ultrasonic mixing and dispersion on the slurry after ball milling, and ultrasonic dispersion was performed at a power of 2000 W for 15 min.

[0098] S3, the powder slurry after ultrasonic dispersion is dried and sieved, and then it is stirred and kneaded with an organic binder in a heating barrel, and kneaded at a temperature of 70° C. for 3 hours. The block material after heating, kneading and cooling is crushed into granular material with an average particle size of 4.5 mm by a jaw crusher inlaid with a ceramic plate to obtain a granulated material;

[0099] S4, using a hot die casting machine to perform hot die casting molding on the granulated material, the molding temperature is 75° C., and the pressure is 2 atmospheres, to obtain a green body containing an organic binder;

[0100] S5. Performing thermal degreasing treatment on the body containing organic binder (microcrystalline wax, stearic acid and oleic acid) to obtain a green body, so as to remove the organic binder in the ceramic body. The degreasing temperature is 900° C., and the temperature is increased from room temperature to 900° C. at a rate of 13° C. / h. The heating time and the holding time are 70 hours in total.

[0101] S6. Place the green blank in a vacuum sintering furnace, then heat it to 1500℃ for 18h, keep it at this temperature for 3h, and cool it to room temperature after 10h. Place the vacuum sintered sample in a high pressure furnace and perform a second sintering heat treatment at 1450℃ for 4h, with the argon gas pressure in the furnace maintained at 75MPa.

[0102] Finally, the ceramic composite material product after the second sintering treatment was placed in a vibration polishing machine. The polishing medium in the polishing machine was diamond sand and pure water. After vibration polishing for 30 hours, the polished ceramic guide wire roller was ultrasonically cleaned and dried to obtain TiO 2 -The final product is TiC-SiC three-phase composite conductive ceramic guide wire roller.

[0103] Embodiment 5:

[0104] The only difference from Example 2 is that the heating and mixing temperature in step S3 is 65°C.

[0105] Embodiment 6:

[0106] The only difference from Example 2 is that the maximum temperature during the thermal debinding process is 800°C.

[0107] Embodiment 7:

[0108] The only difference from Example 2 is that the maximum temperature during the thermal debinding process is 1000°C.

[0109] Embodiment 8:

[0110] The only difference from Example 2 is that the temperature during the vacuum sintering process is 1400°C.

[0111] Embodiment 9:

[0112] The only difference from Example 2 is that the temperature during the vacuum sintering process is 1600°C.

[0113] Embodiment 10:

[0114] The only difference from Example 2 is that the holding time during the vacuum sintering process is 2 hours.

[0115] Comparative Example 1:

[0116] The only difference from Example 2 is that the raw material is only TiO 2 Powder masterbatch.

[0117] Comparative Example 2:

[0118] The only difference from Example 2 is that the raw material is only 96 parts of TiO 2 Powder masterbatch and 4 parts SiO 2 Powder.

[0119] Comparative Example 3:

[0120] The only difference from Example 2 is that the raw material is only 94 parts of TiO 2 Powder masterbatch and 6 parts of C powder.

[0121] Comparative Example 4:

[0122] The only difference from Example 2 is that the vacuum sintered sample is not placed in a high pressure furnace for a second sintering, but the vacuum sintered TiO 2 -TiC-SiC three-phase composite ceramic is directly polished and ground to obtain the finished ceramic guide wire roller.

[0123] Comparative Example 5:

[0124] The only difference from Example 2 is that no argon gas is introduced during the second sintering heat treatment.

[0125] Comparative Example 6:

[0126] The only difference from Example 2 is that no organic binder is added.

[0127] Comparative Example 7:

[0128] The only difference from Example 2 is that the binder is only stearic acid and oleic acid.

[0129] Comparative Example 8:

[0130] The only difference from Example 2 is that the binder is only microcrystalline wax.

[0131] The ceramic guide wire rollers prepared in the above-mentioned embodiments and comparative examples were subjected to performance tests, and the average performance obtained by the tests is shown in Table 1 below.

[0132] Table 1: Average performance test results of ceramic guide wire rollers prepared in Examples and Comparative Examples

[0133]

[0134]

[0135] Note: The reciprocal of resistivity is conductivity. High conductivity means good anti-static ability. The smaller the friction coefficient, the smaller the friction force of ceramics on textile yarns, and the longer the life of ceramic products.

[0136] It can be seen from the above table that the TiO 2 -The initial powder used in the TiC-SiC three-phase composite conductive ceramic guide wire roller is TiO 2 Add an appropriate amount of functional powder SiO 2 Powder and C powder are sintered in vacuum and then sintered again in a high pressure furnace to obtain TiO 2 -TiC-SiC three-phase composite conductive ceramics, thus overcoming the single TiO 2 The ceramic has the disadvantages of low sintering density, poor toughness, low mechanical strength, poor conductivity and antistatic ability, which greatly improves the performance of the product and prolongs its service life. In comparison, the comparative examples without adding the functional powder of the present invention or only adding part of the functional powder have a comprehensive performance far lower than the test results of the embodiments of the present invention.

[0137] In addition, it can be seen from the above test results that the performance of Example 2 of the present invention is particularly outstanding under the formulation composition and process conditions.

[0138] The parts of the embodiments herein that are not exhaustive of the midpoint values ​​of the technical scope claimed for protection by the present invention and the new technical solutions formed by equivalent replacement of single or multiple technical features in the technical solutions of the embodiments are also within the scope claimed for protection by the present invention; at the same time, in all the listed or unlisted embodiments of the scheme of the present invention, each parameter in the same embodiment merely represents an example of its technical solution (i.e., a feasible solution), and there is no strict coordination and limitation relationship between the parameters, wherein the parameters can be replaced with each other without violating the axioms and the claims of the present invention, unless otherwise stated.

[0139] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical schemes composed of any combination of the above technical features. The above is a specific implementation of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

[0140] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A ceramic composite material with excellent antistatic ability and wear resistance, characterized in that: The ceramic composite material comprises the following initial raw materials in parts by weight: 80-95 parts of TiO2 powder, 2-8 parts of SiO2 powder, 3-12 parts of C powder, and 10-15 parts of organic binder.

2. The ceramic composite material having excellent antistatic ability and wear resistance according to claim 1, characterized in that: The average particle size of TiO2 powder is 0.1-1.5μm, the average particle size of SiO2 powder is 0.01-0.5μm, and the average particle size of C powder is 50-150nm.

3. The ceramic composite material with excellent antistatic ability and wear resistance according to claim 1, characterized in that: The binder includes at least one of microcrystalline wax, stearic acid and oleic acid.

4. The ceramic composite material with excellent antistatic ability and wear resistance according to claim 3, characterized in that: The organic binder is a mixture of microcrystalline wax, stearic acid and oleic acid in a mass ratio of (5-20):(0.5-1.5):

1.

5. A method for preparing a ceramic composite material having excellent antistatic ability and wear resistance as claimed in claim 1, characterized in that: The method comprises the following steps: S1. Prepare the raw materials according to claim 1; S2, mixing TiO2 powder, SiO2 powder and C powder to obtain mixed powder; S3, heating and kneading the mixed powder and the organic binder, and then crushing them to obtain granulated materials; S4, hot die-casting the granulated material, and then hot degreasing to obtain a green billet; S5. The green blank is first subjected to vacuum sintering, and then subjected to sintering treatment under high pressure atmosphere conditions to obtain a dense ceramic composite material.

6. The method for preparing a ceramic composite material having excellent antistatic ability and wear resistance according to claim 5, characterized in that: The heating and mixing temperature in step S2 is 60-80° C. and the time is 1-4 hours.

7. The method for preparing a ceramic composite material having excellent antistatic ability and wear resistance according to claim 5, characterized in that: The hot die casting temperature in step S4 is 65-85°C and the pressure is 1-3 atmospheres.

8. The method for preparing a ceramic composite material having excellent antistatic ability and wear resistance according to claim 5, characterized in that: The specific thermal degreasing in step S4 is: the temperature is raised from room temperature to 800-1000° C. at a rate of 13-15° C. / h, and the thermal degreasing time is 60-80 hours in total.

9. The method for preparing a ceramic composite material having excellent antistatic ability and wear resistance according to claim 5, characterized in that: The sintering step S5 is as follows: the green blank is first sintered at 1400-1600° C. for 2-4 hours, and then sintered at 1350-1550° C. for 2-6 hours in a high-pressure argon gas condition of 50-100 MPa.

10. A guide wheel, characterized in that: The guide wire wheel is made of the ceramic composite material according to claim 1.

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