An inorganic bonding glaze and a porcelain bush bonding method using the same

Abstract

The application discloses an inorganic bonding glaze and a porcelain sleeve bonding method using the glaze, and belongs to the technical field of ceramic materials, which comprises the following raw materials: silica powder, feldspar powder, white gangue, Fraxinus mandshurica, barium carbonate and limestone powder; the inorganic bonding glaze is prepared through the following steps: weighing the raw materials according to the formula, mixing and ball milling, and screening the premix through a 300-mesh screen; adding deionized water and ammonium citrate into the premix, stirring, ultrasonic oscillation under constant temperature, adding acrylamide and ammonium persulfate, stirring, ultrasonic oscillation under constant temperature, and obtaining a slurry; pouring the slurry into a mold, vacuumizing, demolding after drying and solidification, crushing and screening through a 40-mesh screen after drying, and obtaining the inorganic bonding glaze. The inorganic bonding glaze has a similar expansion coefficient with the single-joint porcelain sleeve, the matching performance of the inorganic bonding glaze and the single-joint porcelain sleeve is improved, a good intermediate transition layer can be formed after firing, and the strength of the bonded porcelain sleeve is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of ceramic materials technology, specifically relating to an inorganic adhesive glaze and a method for bonding ceramic sleeves using the glaze. Background Technology

[0002] With the continuous increase in voltage levels, the power and electrical industry demands increasingly more large, pollution-resistant porcelain bushings with high voltage ratings. The higher the voltage level, the larger the geometric dimensions and the more complex the structural shape of the bushing. For porcelain bushings with higher voltage levels (above 500kV), conventional integral manufacturing is not only complex and difficult, but also requires large workshops, molding equipment, and specialized firing kilns. Furthermore, electrical porcelain is brittle, and the strength of the blank before firing is not high. To achieve the required height of over 3000mm, the blank itself would be unable to withstand its own weight and would break. Therefore, it is impossible to mold and fire products over 3000mm in one go. Large porcelain bushings are used in ultra-high voltage electrical equipment. To meet the height requirements of ultra-high voltage electrical equipment, the bushings are generally formed and fired in sections, and then the sintered porcelain parts are bonded together. In other words, the product is decomposed into individual fired porcelain sections and then bonded together.

[0003] Adhesives used in bonding processes can be classified into inorganic adhesive glazes and organic adhesive glazes based on their materials. Commonly used organic adhesive glazes include epoxy resin and phenolic resin, which are widely used due to their good adhesion, simple bonding process, and low price. However, organic adhesive glazes tend to flow during curing, and are brittle, have poor elasticity, are prone to aging, and have generally poor electrical properties. This can lead to a decrease in the strength, weather resistance, and aging resistance of the bonded porcelain bushing, thus affecting its service life and posing a significant hazard to the normal operation of electrical equipment. Inorganic adhesive glazes, on the other hand, have excellent temperature resistance, oil resistance, and good aging resistance, high bonding strength, and good electrical properties. However, the formulations of commonly used inorganic adhesive glazes are basically fixed, resulting in unstable strength development. They cannot fully integrate with the porcelain bushing body to achieve optimal strength, making them prone to cracking later on, affecting the service life of the product and potentially leading to safety accidents. Summary of the Invention

[0004] The purpose of this invention is to provide an inorganic adhesive glaze and a method for bonding ceramic sleeves using the glaze, in order to solve the following technical problem: how to improve the strength of ceramic sleeves bonded with inorganic adhesive glaze.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An inorganic adhesive glaze comprises the following raw materials in parts by weight: 15-25 parts silica powder, 20-28 parts feldspar powder, 11-15 parts white gangue, 5-10 parts ash clay, 5-10 parts barium carbonate, and 2-7 parts limestone powder.

[0007] Silica powder is made from natural silica and natural quartz (SiO2). 2) The micro powder, which is produced by multiple processes such as crushing, ball milling (or vibration, air jet milling), flotation, acid washing and purification, and high-purity water treatment, mainly contains SiO2, Al2O3, Fe2O3, CaO and MgO.

[0008] Feldspar powder is an aluminosilicate mineral of alkali metals or alkaline earth metals such as potassium, sodium, calcium, and barium. Its crystal structure is a framework structure, and it mainly contains SiO2, Al2O3, K2O, Na2O, and CaO.

[0009] The main components of white gangue are Al2O3 and SiO2, and it also contains varying amounts of Fe2O3, CaO, MgO, Na2O, K2O, P2O5, SO3 and trace rare elements.

[0010] Ash soil has extremely fine particles, good dispersibility, and strong binding properties. It mainly contains SiO2, Al2O3, TiO2, and Fe2O3.

[0011] With the increase in the amount of white gangue, the content of fluxing oxides such as Fe2O3, CaO, and MgO increases, promoting the breaking of SiO bonds, forming non-bridging oxygen, disrupting the continuity of the silicate structure, reducing the degree of polymerization of silicates, lowering the sintering temperature, and increasing the amount of liquid phase in the inorganic binder glaze. On the one hand, this enhances the bonding force and density of each component, improves the mechanical strength and toughness of the binder glaze, and ensures a tight bond between the inorganic binder glaze and the ceramic sleeve, thus improving the bonding strength of the product. On the other hand, the decrease in SiO2 content reduces the viscosity of the liquid phase, allowing some gas to escape through the low-viscosity liquid phase, thereby reducing the closed porosity and increasing the bulk density and strength of the inorganic binder glaze. Furthermore, the reduced SiO2 content increases the coefficient of thermal expansion of the binder glaze, ensuring that the coefficient of thermal expansion is comparable to that of the ceramic sleeve, while also allowing for a good chemical reaction between the ceramic sleeve and the inorganic binder glaze.

[0012] The inorganic adhesive glaze is prepared by the following steps:

[0013] Step 1: Weigh the raw materials according to the formula, mix them evenly, place them in an agate mortar for ball milling, and pass them through a 300-mesh sieve to obtain the premix.

[0014] Step 2: Add deionized water and ammonium citrate to the premix, stir for 5-10 minutes, and ultrasonically vibrate for 50-60 minutes under constant temperature. Add acrylamide and ammonium persulfate, stir for 5-10 minutes, and ultrasonically vibrate for 15-20 minutes under constant temperature to obtain the slurry.

[0015] Step 3: Pour the slurry into the mold, vacuum for 1 hour, dry at 20±5℃ for 48 hours to solidify, then demold, dry at 80℃ for 24 hours, pulverize and pass through a 40-mesh sieve to obtain inorganic adhesive glaze.

[0016] The premix obtained by ball milling the inorganic adhesive glaze raw materials through a 300-mesh sieve was added to deionized water and ammonium citrate. Ammonium citrate, acting as a dispersant, readily dissociates into trivalent anions in water, exhibiting specific adsorption of metal ions in the premix. This improves the dispersibility and uniformity of the premix in water, resulting in a suspension of the premix with low viscosity and high solid content. A small amount of the organic monomer acrylamide was then added. Ammonium persulfate was used as an initiator to initiate in-situ polymerization of acrylamide, cross-linking to form a three-dimensional network structure. This allowed the liquid slurry to solidify in-situ, be demolded, dried, and have organic matter removed. The resulting slurry was then pulverized and passed through a 40-mesh sieve to obtain the inorganic adhesive glaze. The gel casting method for preparing the inorganic adhesive glaze, compared to the ball milling method, effectively reduced the closed porosity, while also resulting in more uniform pore size and pore distribution within the matrix, thus significantly improving the strength of the inorganic adhesive glaze.

[0017] As a further aspect of the present invention, the mass ratio of the premix, deionized water, ammonium citrate, acrylamide, and ammonium persulfate is 20:30:0.16:4-10:0.03-0.06.

[0018] A method for bonding ceramic sleeves using the above-mentioned inorganic adhesive glaze includes the following steps:

[0019] Step 1: Cut corresponding matching convex and concave interfaces on the connecting end faces of the single-section ceramic bushing to obtain the upper and lower sections of the ceramic bushing;

[0020] Step 2: Remove grease and dust from the connecting end faces of the upper and lower ceramic sleeves. Fix and level the lower ceramic sleeve. Apply inorganic adhesive glaze to the concave interface of the connecting end face of the lower ceramic sleeve. The thickness of the adhesive glaze should be 1-1.5mm. Use a crane to lift the upper ceramic sleeve and slowly lower it so that its convex interface matches the concave interface of the lower ceramic sleeve. Assemble the upper and lower ceramic sleeves and remove any excess inorganic adhesive glaze that has been squeezed out.

[0021] Step 3: Place the assembled porcelain sleeve into the kiln for firing. Heat the kiln to 600℃ at a rate of 5-10℃, then heat it to 970℃ at a rate of 10-20℃ / h. Firing the kiln with an open flame is then carried out, and the temperature is further increased to 1100℃ at a rate of 10-20℃ / h. Then, the temperature is increased at a rate of 5℃ / h. When the temperature reaches 1170℃, the open flame firing is stopped, and the final shut-off temperature is controlled between 1260-1270℃. The temperature is maintained for more than 6 hours.

[0022] Step 4: After the heat preservation is completed, turn off the heat source of the kiln and let the porcelain sleeve cool naturally to room temperature with the kiln to obtain the finished porcelain sleeve.

[0023] As a further embodiment of the present invention, the single-section ceramic sleeve comprises the following raw materials in parts by weight: 20-30 parts of calcined bauxite, 25-35 parts of kaolin, 5-10 parts of bentonite, 5-8 parts of talc, 2-3 parts of molybdenum trioxide particles, 3-5 parts of lithium carbonate, and 10-17 parts of potassium carbonate.

[0024] As a further aspect of the present invention, the single-section ceramic sleeve is prepared by the following steps:

[0025] Step S1: Weigh the raw materials according to the formula, mix them evenly to obtain premixed porcelain sleeve raw materials; place the premixed porcelain sleeve raw materials, pebbles and water in a ball mill at a mass ratio of 1:3:2, ball mill for more than 40 hours, and pass through a 300-mesh sieve to remove iron to obtain porcelain sleeve slurry.

[0026] Step S2: Use a filter press to remove the moisture from the ceramic sleeve slurry to 10-15%, age for 48 hours, extrude and shape, dry at 20±5℃ for 48 hours, then place in a sintering furnace and heat to 600-700℃ at a rate of 10℃ / min, hold for 3-4 hours to obtain a single-section ceramic sleeve.

[0027] The beneficial effects of this invention are:

[0028] This invention uses silica powder, feldspar powder, white gangue, ash clay, barium carbonate, and limestone powder as raw materials to prepare an inorganic adhesive glaze. It mainly contains SiO2, Fe2O3, CaO, and MgO. With the increase in the amount of white gangue, the content of fluxing oxides such as Fe2O3, CaO, and MgO increases, promoting the breaking of Si-O bonds, forming non-bridging oxygen, disrupting the continuity of the silicate structure, reducing the degree of polymerization of silicates, lowering the sintering temperature, and increasing the amount of liquid phase in the inorganic adhesive glaze. On the one hand, this enhances the bonding force and density of each component, improves the mechanical strength and toughness of the adhesive glaze, and ensures a tight bond between the inorganic adhesive glaze and the ceramic sleeve, improving the bonding strength of the product. On the other hand, the reduced SiO2 content lowers the liquid phase viscosity, allowing some gas to escape through the low-viscosity liquid phase, thereby reducing the closed porosity and improving the bulk density and strength of the inorganic adhesive glaze. Furthermore, the reduced SiO2 content increases the expansion coefficient of the adhesive glaze, ensuring that the expansion coefficient is comparable to that of the porcelain sleeve, while also allowing for a good chemical reaction between the porcelain sleeve and the inorganic adhesive glaze. Ash clay has extremely fine particle size, good dispersibility, and strong adhesion. It mainly contains SiO2, Al2O3, TiO2, and Fe2O3. Adding it to the glaze in a suitable proportion improves the bonding strength of the inorganic adhesive glaze.

[0029] This invention employs a gel casting method instead of ball milling to prepare inorganic adhesive glaze, effectively reducing closed-pore porosity and resulting in more uniform pore size and distribution within the matrix, thus significantly improving the strength of the inorganic adhesive glaze. The principle and steps are as follows: The premix obtained by ball milling the inorganic adhesive glaze raw materials through a 300-mesh sieve is added to deionized water and ammonium citrate. Ammonium citrate acts as a dispersant, readily dissociating trivalent anions in water, which adsorb metal ions from the premix, thereby improving the dispersibility and uniformity of the premix in water, resulting in a low-viscosity, high-solid-content suspension. A small amount of the organic monomer acrylamide is then added. Ammonium persulfate is used as an initiator to initiate in-situ polymerization of acrylamide, cross-linking to form a three-dimensional network structure. This allows the liquid slurry to solidify in-situ, be demolded, dried, and have organic matter removed. The resulting slurry is then pulverized and passed through a 40-mesh sieve to obtain the inorganic adhesive glaze.

[0030] This invention uses calcined bauxite, kaolin, bentonite, talc, molybdenum trioxide particles, lithium carbonate, and potassium carbonate as raw materials to prepare single-section porcelain sleeves, which have excellent mechanical strength and insulation properties. Among them, molybdenum trioxide (MoO3), lithium carbonate (Li2CO3), and potassium carbonate (K2CO3) can react with titanium dioxide (TiO2) in the inorganic binder glaze during high-temperature sintering to form titanates. At the same time, the large amount of SiO2 in kaolin, bentonite, and talc reacts with CaO and MgO in the inorganic binder glaze during high-temperature sintering to form diopside crystals (CaO+MgO+2SiO2=CaMgSi2O6). The reduced SiO2 content in the inorganic binder glaze promotes the chemical reaction between the porcelain sleeve and the inorganic binder glaze to a certain extent.

[0031] The coefficient of thermal expansion of the inorganic adhesive glaze of this invention is similar to that of the single-section porcelain sleeve in this invention. Furthermore, the inorganic adhesive glaze itself has increased strength, which improves its matching performance with the single-section porcelain sleeve. At the same time, extending the high-temperature holding time helps to expel the pores in the inorganic adhesive glaze, and a good intermediate transition layer can be formed after firing, which effectively improves the strength of the adhesive porcelain sleeve. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] An inorganic adhesive glaze is prepared by the following steps:

[0035] Step 1: Weigh 150g of silica powder, 200g of feldspar powder, 110g of white gangue, 50g of ash clay, 50g of barium carbonate, and 20g of limestone powder. Mix them evenly and place them in an agate mortar for ball milling. Pass the mixture through a 300-mesh sieve to obtain the premix.

[0036] Step 2: Add 300g deionized water and 1.6g ammonium citrate to 200g premix, stir for 5 minutes, and ultrasonically vibrate for 50 minutes under constant temperature. Add 40g acrylamide and 0.3g ammonium persulfate, stir for 5 minutes, and ultrasonically vibrate for 15-20 minutes under constant temperature to obtain slurry.

[0037] Step 3: Pour the slurry into the mold, vacuum for 1 hour, dry at 20±5℃ for 48 hours to solidify, then demold, dry at 80℃ for 24 hours, pulverize and pass through a 40-mesh sieve to obtain inorganic adhesive glaze.

[0038] Comparative Example 1

[0039] An inorganic adhesive glaze is prepared by the following steps:

[0040] Compared with Example 1, this comparative example is identical except that "110g of white gangue" was not added in step one.

[0041] Comparative Example 2

[0042] An inorganic adhesive glaze is prepared by the following steps:

[0043] Compared with Example 1, this comparative example is identical except that "50g of ash wood soil" was not added in step one.

[0044] Comparative Example 3

[0045] An inorganic adhesive glaze is prepared by the following steps:

[0046] Weigh out 150g of silica powder, 200g of feldspar powder, 110g of white gangue, 50g of ash clay, 50g of barium carbonate, and 20g of limestone powder. Mix them evenly and then ball mill them to a fineness of 300 mesh according to the ratio of material:ball stone:water = 1:1.8:1. Dry them into blocks, then crush them and pass them through a 40-mesh sieve to obtain an inorganic adhesive glaze.

[0047] Example 2

[0048] An inorganic adhesive glaze is prepared by the following steps:

[0049] Step 1: Weigh 250g of silica powder, 280g of feldspar powder, 150g of white gangue, 100g of ash clay, 100g of barium carbonate, and 70g of limestone powder. Mix them evenly and place them in an agate mortar for ball milling. Pass the mixture through a 300-mesh sieve to obtain the premix.

[0050] Step 2: Add 300g deionized water and 1.6g ammonium citrate to 200g premix, stir for 10min, and ultrasonically vibrate for 60min under constant temperature. Add 100g acrylamide and 0.6g ammonium persulfate, stir for 10min, and ultrasonically vibrate for 20min under constant temperature to obtain slurry.

[0051] Step 3: Pour the slurry into the mold, vacuum for 1 hour, dry at 20±5℃ for 48 hours to solidify, then demold, dry at 80℃ for 24 hours, pulverize and pass through a 40-mesh sieve to obtain inorganic adhesive glaze.

[0052] Example 3

[0053] A single-section ceramic sleeve is prepared using the following steps:

[0054] Step S1: Weigh 200g of calcined bauxite, 250g of kaolin, 50g of bentonite, 50g of talc powder, 20g of molybdenum trioxide granules, 30g of lithium carbonate, and 100g of potassium carbonate, mix them evenly to obtain premixed porcelain sleeve raw materials; place the premixed porcelain sleeve raw materials, ball stones, and water in a ball mill at a mass ratio of 1:3:2, ball mill for 41 hours, and pass through a 300-mesh sieve to remove iron to obtain porcelain sleeve slurry;

[0055] Step S2: Use a filter press to remove the moisture from the ceramic sleeve slurry to 10%, age for 48 hours, extrude and shape, dry at 20±5℃ for 48 hours, then place in a sintering furnace and heat to 600℃ at a rate of 10℃ / min, hold for 3 hours to obtain a single-section ceramic sleeve.

[0056] Comparative Example 4

[0057] A single-section ceramic sleeve is prepared using the following steps:

[0058] Compared with Example 3, this comparative example only omits the addition of "20g of molybdenum trioxide particles, 30g of lithium carbonate, and 100g of potassium carbonate". All other steps and parameters are the same.

[0059] Example 4

[0060] A single-section ceramic sleeve is prepared using the following steps:

[0061] Step S1: Weigh 300g of calcined bauxite, 350g of kaolin, 100g of bentonite, 80g of talc powder, 30g of molybdenum trioxide granules, 50g of lithium carbonate, and 170g of potassium carbonate, mix them evenly to obtain premixed porcelain sleeve raw materials; place the premixed porcelain sleeve raw materials, ball stones, and water in a ball mill at a mass ratio of 1:3:2, ball mill for 41 hours, and pass through a 300-mesh sieve to remove iron to obtain porcelain sleeve slurry;

[0062] Step S2: Use a filter press to remove the moisture from the ceramic sleeve slurry to 15%, age for 48 hours, extrude and shape, dry at 20±5℃ for 48 hours, then place in a sintering furnace and heat to 700℃ at a rate of 10℃ / min, hold for 4 hours to obtain a single ceramic sleeve.

[0063] Example 5

[0064] A method for bonding ceramic sleeves using inorganic adhesive glaze includes the following steps:

[0065] Step 1: Open corresponding matching convex and concave interfaces on the connecting end face of the single-section ceramic sleeve obtained in Example 3 to obtain the upper and lower sections of ceramic sleeve;

[0066] Step 2: Remove grease and dust from the connecting end faces of the upper and lower ceramic sleeves. Fix and level the lower ceramic sleeve. Apply the inorganic adhesive glaze prepared in Example 1 to the concave interface of the connecting end face of the lower ceramic sleeve. The thickness of the adhesive glaze is 1mm. Use a crane to lift the upper ceramic sleeve and slowly lower it so that its convex interface matches the concave interface of the lower ceramic sleeve. Assemble the upper and lower ceramic sleeves and remove the excess inorganic adhesive glaze that has been squeezed out.

[0067] Step 3: Place the assembled porcelain sleeve into the kiln for firing. Heat the kiln to 600℃ at a rate of 5-10℃, then heat it to 970℃ at a rate of 10℃ / h. Firing the kiln with an open flame is then carried out, and the temperature is further increased to 1100℃ at a rate of 10℃ / h. Then, the temperature is increased at a rate of 5℃ / h. When the temperature reaches 1170℃, the open flame firing is stopped, and the final shut-off temperature is controlled between 1260-1270℃. The temperature is then maintained for 6.5 hours.

[0068] Step 4: After the heat preservation is completed, turn off the heat source of the kiln and let the porcelain sleeve cool naturally to room temperature with the kiln to obtain the finished porcelain sleeve.

[0069] Example 6

[0070] A method for bonding ceramic sleeves using inorganic adhesive glaze includes the following steps:

[0071] Step 1: Open corresponding matching convex and concave interfaces on the connecting end face of the single-section ceramic sleeve obtained in Example 4 to obtain the upper and lower sections of ceramic sleeve.

[0072] Step 2: Remove grease and dust from the connecting end faces of the upper and lower ceramic sleeves. Fix and level the lower ceramic sleeve. Apply the inorganic adhesive glaze prepared in Example 2 to the concave interface of the connecting end face of the lower ceramic sleeve. The thickness of the adhesive glaze is 1.5mm. Use a crane to lift the upper ceramic sleeve and slowly lower it so that its convex interface matches the concave interface of the lower ceramic sleeve. Assemble the upper and lower ceramic sleeves and remove the excess inorganic adhesive glaze that has been squeezed out.

[0073] Step 3: Send the assembled porcelain sleeve into the kiln for firing. Raise the kiln temperature to 600℃ at a rate of 10℃ / h, then raise it to 970℃ at a rate of 20℃ / h. Firing the kiln with an open flame is then carried out, and the temperature is raised to 1100℃ at a rate of 20℃ / h. Then, the temperature is raised to 1170℃. When the temperature reaches 1170℃, the open flame firing is stopped, and the final shutdown temperature is controlled between 1260-1270℃. The temperature is maintained for 6.5 hours.

[0074] Step 4: After the heat preservation is completed, turn off the heat source of the kiln and let the porcelain sleeve cool naturally to room temperature with the kiln to obtain the finished porcelain sleeve.

[0075] Comparative Example 5

[0076] A method for bonding ceramic sleeves using inorganic adhesive glaze includes the following steps:

[0077] Compared with Example 5, this comparative example only replaces "the inorganic adhesive glaze prepared in Example 1" with "the inorganic adhesive glaze prepared in Comparative Example 1", and all other steps and parameters are the same.

[0078] Comparative Example 6

[0079] A method for bonding ceramic sleeves using inorganic adhesive glaze includes the following steps:

[0080] Compared with Example 5, this comparative example only replaces "the inorganic adhesive glaze prepared in Example 1" with "the inorganic adhesive glaze prepared in Comparative Example 2", and all other steps and parameters are the same.

[0081] Comparative Example 7

[0082] A method for bonding ceramic sleeves using inorganic adhesive glaze includes the following steps:

[0083] Compared with Example 5, this comparative example only replaces "the inorganic adhesive glaze prepared in Example 1" with "the inorganic adhesive glaze prepared in Comparative Example 3", and all other steps and parameters are the same.

[0084] Comparative Example 8

[0085] A method for bonding ceramic sleeves using inorganic adhesive glaze includes the following steps:

[0086] Compared with Example 5, this comparative example only replaces "the single-section ceramic sleeve obtained in Example 3" with "the single-section ceramic sleeve obtained in Comparative Example 4", and all other steps and parameters are the same.

[0087] Comparative Example 9

[0088] A method for bonding ceramic sleeves using inorganic adhesive glaze includes the following steps:

[0089] Compared with Example 5, this comparative example only replaces "and finally control the shutdown temperature between 1260-1270°C and keep it at that temperature for 6.5 hours" with "and finally control the shutdown temperature between 1220-1230°C and keep it at that temperature for 6 hours". All other steps and parameters are the same.

[0090] The following performance tests were performed on Examples 5-6 and Comparative Examples 5-9:

[0091] (1) Porosity test: The bulk density D of the sample was tested using the Archimedes displacement method. b The specific gravity bottle method is used to measure the true density D of a sample. t And using formula P t =(D t -D b ) / D t Calculate the porosity P of the sample by multiplying by 100%. t ;

[0092] (2) Coefficient of expansion test: The average linear expansion coefficient of the sample under test at 25-400℃ is tested in accordance with QB / T 1321-2012.

[0093] (3) Tensile bond strength test: The tensile bond strength of the finished ceramic sleeve to be tested was measured using a tensile testing machine at a loading rate of 250±50 N / s and calculated according to the following formula:

[0094] Tensile bond strength (MPa) = Total tensile load (N) / Tensile area (mm²) 2 )

[0095] The test results are shown in Table 1:

[0096] Table 1

[0097] Test Project Porosity / % Average linear expansion coefficient / ℃ Tensile bond strength / MPa Example 5 1.42 <![CDATA[4.92×10 －6 ]]> 228.5 Example 6 1.38 <![CDATA[4.83×10 －6 ]]> 237.9 Comparative Example 5 2.87 <![CDATA[4.70×10 －6 ]]> 198.4 Comparative Example 6 1.39 <![CDATA[4.90×10 －6 ]]> 180.6 Comparative Example 7 3.51 <![CDATA[4.91×10 －6 ]]> 206.5 Comparative Example 8 1.40 <![CDATA[4.92×10 －6 ]]> 181.5 Comparative Example 9 2.25 <![CDATA[4.90×10 －6 ]]> 210.8

[0098] Note: In Examples 5-6 and Comparative Example 5, the average linear expansion coefficient of the corresponding inorganic adhesive glaze used at 25-400℃ was tested; in Comparative Examples 6-9, the average linear expansion coefficient of the finished ceramic sleeves used at 25-400℃ was tested; in Examples 5-6 and Comparative Examples 5-9, the porosity of the corresponding inorganic adhesive glaze used was tested.

[0099] As can be seen from Table 1, the inorganic adhesive glazes prepared in Examples 1-2 and used in Examples 5-6 of the present invention have significantly lower porosity than the inorganic adhesive glazes prepared in Comparative Examples 1-3 and used in Comparative Examples 5-9. The coefficient of thermal expansion of the inorganic adhesive glazes prepared in Examples 1-2 and used in Examples 5-6 of the present invention is similar to that of the finished porcelain sleeves. The bonding strength of the finished porcelain sleeves prepared in Examples 5-6 of the present invention is significantly improved to varying degrees compared with the finished porcelain sleeves prepared in Comparative Examples 5-9.

[0100] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0101] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A porcelain jacket cementing method of inorganic cementing glaze, characterized by, It comprises the following steps: Step 1: the connecting end surface of the single-section porcelain sleeve is opened to correspond to the male and female interfaces respectively, and the upper and lower section porcelain sleeves are obtained; Step 2: the oily and dusty on the connecting end surface of the upper and lower section porcelain sleeves is removed, the lower section porcelain sleeve is fixed and leveled, the inorganic bonding glaze is coated on the surface of the female interface part of the connecting end surface of the lower section porcelain sleeve, the coating thickness of the bonding glaze is 1-1.5mm, the upper section porcelain sleeve is lifted by a crane, the upper section porcelain sleeve is slowly lowered, the male interface of the upper section porcelain sleeve is matched with the female interface of the lower section porcelain sleeve, the upper and lower section porcelain sleeves are spliced into shape, and the excess inorganic bonding glaze is removed; Step 3: the spliced porcelain sleeve is sent into a kiln for firing, the kiln is heated to 600℃ at a speed of 5-10℃, then the kiln is heated to 970℃ at a speed of 10-20℃ / h, the kiln is fired by using open fire, the kiln is continuously heated to 1100℃ at a speed of 10-20℃ / h, then the kiln is continuously heated at a speed of 5℃ / h, the open fire is stopped when the temperature rises to 1170℃, and the final control of the stop fire temperature is between 1260-1270℃, and the temperature is kept for more than 6h; Step 4: the heat source of the kiln is cut off after the heat preservation is completed, the porcelain sleeve is naturally cooled to room temperature with the kiln, and the finished product porcelain sleeve is obtained; The inorganic bonding glaze comprises the following raw materials by weight: 15-25 parts of silica powder, 20-28 parts of feldspar powder, 11-15 parts of white gangue, 5-10 parts of water curved willow soil, 5-10 parts of barium carbonate, and 2-7 parts of limestone powder; The inorganic bonding glaze comprises the following steps: Step one: the raw materials are weighed according to the formula, mixed uniformly, and placed in a agate mortar for ball milling, and then screened through a 300 mesh sieve to obtain a premix; Step two: deionized water and ammonium citrate are added to the premix, stirred for 5-10 minutes, ultrasonic oscillation for 50-60 minutes under constant temperature conditions, acrylamide and ammonium persulfate are added, stirred for 5-10 minutes, ultrasonic oscillation for 15-20 minutes under constant temperature conditions, and a slurry is obtained; Step three: the slurry is poured into a mold, vacuumized for 1 hour, dried for 48 hours at 20±5℃, demolded after solidification, crushed and screened through a 40 mesh sieve after drying for 24 hours at 80℃, and an inorganic bonding glaze is obtained; The single-section porcelain sleeve comprises the following raw materials by weight: 20-30 parts of calcined bauxite, 25-35 parts of kaolin, 5-10 parts of bentonite, 5-8 parts of talc powder, 2-3 parts of molybdenum trioxide particles, 3-5 parts of lithium carbonate, and 10-17 parts of potassium carbonate.

2. The method for bonding a porcelain jacket according to claim 1, wherein The mass ratio of the premix, deionized water, ammonium citrate, acrylamide, and ammonium persulfate is 20:30:0.16:4-10:0.03-0.

06.

3. The method of claim 1, wherein the inorganic bonding glaze is a mixture of a lead-free glass frit and a binder. The single-section porcelain sleeve comprises the following steps: Step S1: the raw materials are weighed according to the formula, mixed uniformly, and a premix porcelain sleeve raw material is obtained; the premix porcelain sleeve raw material, ball stone and water are placed in a ball mill at a mass ratio of 1:3:2, ball milled for more than 40 hours, and screened through a 300 mesh sieve to remove iron to obtain a porcelain sleeve slurry. Step S2: the water in the porcelain bushing slurry is removed to 10-15% by using a filter press, aged for 48 h, extruded, dried at 20±5℃ for 48 h, then heated to 600-700℃ at a rate of 10℃ / min in a sintering furnace, and kept for 3-4 h to obtain a single-section porcelain bushing.