CN107759230B - Toughened ceramic gel injection molding method - Google Patents
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- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
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Abstract
The invention belongs to the technical field of ceramic preparation. The invention provides a method for injection molding toughened ceramic gel, which aims at solving the problems of easy cracking and difficult processing in the drying process of the conventional structural ceramic and aims at solving the problems in the prior art. The invention improves the microstructure of the polymer, improves the plasticity of the ceramic body, and greatly improves the drying performance of a wet body and the processability of a dry ceramic body by the approaches of pretreating the ceramic raw material, improving the drying method of the ceramic body and the like.
Description
Technical Field
The invention relates to a preparation method of a ceramic material, in particular to a method for molding a toughened ceramic gel injection mold, and belongs to the technical field of ceramic preparation.
Background
At present, the requirements on materials in industrial production are more and more strict, and structural ceramics are more and more widely applied to various industrial industries due to excellent mechanical and thermal properties of the structural ceramics.
Structural ceramics are mostly prepared by wet forming. The wet forming is a method for injecting ceramic slurry into a mold to be cured to form a ceramic blank, ceramic products with various complicated shapes can be easily prepared by the wet forming, but the traditional wet forming process such as slip casting can not ensure the uniform density of the formed blank, and the product can not ensure the accuracy of the shape and the size of the product due to the defects of cracking and the like caused by the large shrinkage of the product in the drying and sintering process due to the existence of a liquid phase.
The gel casting process combines ceramic slip casting technology and high molecular chemical polymerization theory perfectly, and the principle is that firstly, ceramic slurry with low viscosity and high solid content is prepared, then under the action of initiator and catalyst, organic monomer and cross-linking agent are cross-linked and polymerized to form three-dimensional network structure, the ceramic particles are locked in the blank by the three-dimensional network structure and are cured and formed in situ, finally, the ceramic blank with high strength and uniform density and capable of being processed by precision machine is obtained. The gel casting technology has very important significance for preparing high-performance ceramic materials with complex shapes and uniform component requirements.
However, the polymer obtained by the gel casting technology has high rigidity and large residual stress of a ceramic blank, and the blank is easy to crack, deform and the like in the drying process. In addition, the resulting green body, while high in strength, is less tough and tends to wear the tool during machining.
The inventor previously developed a structural ceramic water-based gel injection molding method, which improves the plasticity of a molded blank body, reduces the residual stress of the blank body, lightens the cracking phenomenon in the drying process to a certain extent and improves the processing performance of the blank body by adding glycerol or Tween 80 as a plasticizer into a raw material solution, but the problems of cracking of the blank body during drying and processability of the dried blank body are still to be improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a toughening ceramic gel injection molding method, which improves the microstructure of a polymer to improve the plasticity of a ceramic blank body by pretreating a ceramic raw material, avoids cracking of a wet blank during drying and increases the processability of a dry ceramic blank.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a method for molding toughened ceramic gel comprises the following steps:
(1) adding a ceramic raw material into a ball milling tank, grinding the ceramic raw material into ceramic powder of 0.1-1 mu m, adding the ceramic powder into a mixed solution of ethanol and water, dropwise adding polyvinylpyrrolidone (PVP) and ammonia water while stirring, then ultrasonically dispersing at room temperature, then adding ethyl orthosilicate into the solution under the condition of continuous stirring, reacting at room temperature for 4-24 h, and centrifugally drying to obtain silicon dioxide coated ceramic powder; the volume ratio of the ethanol to the water to the ethyl orthosilicate is (20-50): 1 (1-2), the volume ratio of the water to the ammonia water is (2-10): 1, the ceramic powder accounts for 1-10 wt% of the whole system, and the PVP accounts for 1-5 wt% of the ceramic powder;
(2) weighing an organic monomer and a crosslinking agent, putting the organic monomer and the crosslinking agent into a beaker, adding deionized water to fully dissolve the organic monomer and the crosslinking agent, then adding a dispersing agent and an aqueous cosolvent, fully stirring, adjusting the pH of the system to be 8-11 by using ammonia water, adding a plasticizer and an initiator into the solution, uniformly stirring, adding the silicon dioxide coated ceramic powder in the step (1), performing ultrasonic dispersion for 10-30 min at room temperature, adding a catalyst, rapidly stirring, and removing bubbles dissolved in ceramic slurry in vacuum; the ceramic slurry comprises 1-3 wt% of organic monomers, 1 (5-30) of a cross-linking agent and the organic monomers, 8-20 wt% of deionized water, 0.5-2 wt% of a dispersing agent, 0-10 wt% of a water-based cosolvent, 20-50 wt% of an organic monomer, 0.01-1 wt% of an initiator and 0.01-1 wt% of a catalyst, wherein the mass ratio of the cross-linking agent to the organic monomers is 1;
(3) carefully injecting the ceramic slurry in the step (2) into a mold, and placing the mold in a water bath kettle at 50-80 ℃ to heat for 5-15 min to obtain a solidified ceramic wet blank; water-cooling the mold, demolding to obtain a ceramic wet blank, immersing the ceramic wet blank into an ethanol water solution for 12 hours, then placing the ceramic wet blank in a constant-temperature and constant-humidity drying box with the temperature of 40 ℃ and the relative humidity of 92% for drying for 48 hours, and then placing the ceramic wet blank in a constant-temperature and constant-humidity drying box with the temperature of 80 ℃ and the relative humidity of 20% for drying for 12 hours; and after drying, machining the ceramic thread of M8 on a green body of the lathe by using a hard alloy cutter, degreasing the machined ceramic green body in a glue removing furnace, heating to 600 ℃ at a speed of 0.6 ℃/min, preserving heat for 1h, heating to 1600 ℃ at a speed of 3 ℃/min, preserving heat for 2h to obtain a ceramic product, and finally performing quality detection.
In one embodiment, the organic monomer is any one of acrylamide, methacrylamide, N-methylolacrylamide, N-N' methylenebisacrylamide, methacrylamide, acrylic acid, methacrylic acid, and hydroxyethyl acrylate; the cross-linking agent is Methylene Bisacrylamide (MBAM) or poly (vinyl glycol) dimethacrylate (PEGDAM).
In one embodiment, the dispersant is any one of citric acid, ammonium Citrate (CT), hydroxymethyl cellulose, polyacrylic acid and its copolymer (PAA), Polyethyleneimine (PEI); the water-soluble cosolvent is any one of ethanol, ethylene glycol, n-propanol, 1, 2-propylene glycol, n-butanol, 1, 4-butanediol, 1, 6-hexanediol, diethylene glycol, triethylene glycol, polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600 and glycerol.
In one embodiment, the plasticizer is polyethylene glycol, polymethacrylamide, glycerol or triethylene glycol acetate; the initiator is any one of Ammonium Persulfate (APS), hydrogen peroxide and azo [ 2-imidazoline-2-propane ] hydrochloride (AZIP).
In one embodiment, the catalyst is Tetramethylethylenediamine (TEMED).
In one embodiment, the ceramic powder is alumina, zirconia, silicon nitride or aluminum titanate.
As can be seen from the above description, the present invention has the following advantages:
1. the ceramic raw material is pretreated to obtain ceramic powder with the surface coated with silicon dioxide, on one hand, the rich hydroxyl groups on the surface of the silicon dioxide improve the hydrophilicity of the surface of ceramic powder particles, the ceramic powder is easier to stably disperse to obtain ceramic slurry with good dispersibility, and a ceramic blank with a uniform structure and few internal defects is obtained after in-situ curing; on the other hand, the silicon dioxide coated on the surface of the ceramic powder can compensate microcracks appearing on the surface of the ceramic blank in the drying process, improve the bending strength of the ceramic blank, inhibit the growth of crystal grains in the sintering process, form a compact and uniform ceramic blank and play a role in toughening;
2. during drying, a method of immersing the green body in an alcohol aqueous solution and then drying the green body step by step at different humidity and temperature is adopted, so that the green body can be quickly dried, and the green body can be effectively prevented from being cracked in the drying process.
3. The water-soluble cosolvent is added into the ceramic slurry, so that the viscosity of the ceramic slurry and the viscosity of a reaction system in a polymerization process can be reduced, and the in-situ solidification of the ceramic slurry is facilitated;
4. the ball milling of the ball mill is changed into the ultrasonic treatment of the dispersion mode of the ceramic powder, so that the introduction of impurities in the ball milling process can be avoided;
5. adding an initiator before ultrasonic dispersion, wherein the initiator can be uniformly distributed in the ceramic slurry, so as to ensure that all parts of the system react simultaneously, and obtain a ceramic wet blank with a uniform structure, so as to reduce the residual stress in the blank and reduce the dry cracking of the blank in the drying process;
Detailed Description
The features of the present invention will be further illustrated by the following examples, but the present invention is not limited to the examples.
Example 1:
weighing 3g of methacrylamide and 0.6g of MBAM, putting the methacrylamide and the MBAM into a beaker, adding 20g of deionized water to fully dissolve the methacrylamide and the MBAM, then adding 2g of ammonium citrate to fully stir, adjusting the pH of a system to be 8-11 by using ammonia water, then adding 0.9g of glycerol and 0.3ml of 10% APS into the solution to stir uniformly, adding 100g of ceramic powder, performing ultrasonic dispersion at room temperature for 30min, then adding 0.03g of TEMED, rapidly stirring, and removing bubbles dissolved in ceramic slurry in vacuum; then carefully injecting the ceramic slurry into a mold, and placing the mold in a water bath kettle at 50-80 ℃ to heat for 5-15 min to obtain a solidified ceramic wet blank; water cooling the mould, demoulding to obtain wet ceramic rod blanks with diameters of 15mm, 35mm, 40mm, 43mm and 45mm respectively; drying the wet ceramic rod blank for 72h at room temperature, and then drying the wet ceramic rod blank for 12h in an electric heating drying oven at the temperature of 80 ℃; and after drying, machining the ceramic thread of M8 by using a lathe green body by using a hard alloy cutter, degreasing the machined ceramic green body in a glue removing furnace, heating to 600 ℃ at the speed of 0.6 ℃/min, keeping the temperature for 1h, heating to 1600 ℃ at the speed of 3 ℃/min, and keeping the temperature for 2 h.
The results show that the ceramic rod with the diameter of 15mm has no cracking phenomenon during drying and heat treatment, the sintered relative density reaches 99 percent, but the ceramic rods with other diameters have obvious cracking phenomenon after drying. A sample is selected as a cylinder with the diameter of 15mm to be used for green body processing test, the green body processing condition is that the machine rotating speed is 100rpm, and the corresponding surface speed is 9.4 sm/min. The feed rate was 0.35 mm/revolution and the feed rate was 0.5 mm. The green body processing result shows that the green body has high enough strength, but the green body has poor plasticity, so that the screw thread of M8 has severe breaking angle and is seriously worn on a hard alloy cutter.
Example 2:
adding 10g of ceramic powder into a mixed solution of 100ml of ethanol and 5ml of water, dropwise adding 0.5g of polyvinylpyrrolidone (PVP) and 0.5g of ammonia water while stirring, then ultrasonically dispersing at room temperature, then adding 10ml of ethyl orthosilicate into the solution under the condition of continuous stirring, reacting at room temperature for 4-24 h, and centrifugally drying to obtain the silicon dioxide coated ceramic powder.
Weighing 3g of methacrylamide and 0.6g of MBAM, putting the methacrylamide and the MBAM into a beaker, adding 20g of deionized water to fully dissolve the methacrylamide and the MBAM, then adding 2g of ammonium citrate to fully stir, adjusting the pH of a system to be 8-11 by using ammonia water, then adding 0.9g of glycerol and 0.3ml of 10% APS into the solution to stir uniformly, adding 100g of silicon dioxide coated ceramic powder, adding 0.03g of TEMED after ultrasonic dispersion is carried out for 30min at room temperature, rapidly stirring, and then removing bubbles dissolved in ceramic slurry in vacuum; then carefully injecting the ceramic slurry into a mold, and placing the mold in a water bath kettle at 50-80 ℃ to heat for 5-15 min to obtain a solidified ceramic wet blank; water cooling the mould, demoulding to obtain wet ceramic rod blanks with diameters of 15mm, 35mm, 40mm, 43mm and 45mm respectively; drying the wet ceramic rod blank for 72h at room temperature, and then drying the wet ceramic rod blank for 12h in an electric heating drying oven at the temperature of 80 ℃; and after drying, machining the ceramic thread of M8 by using a lathe green body by using a hard alloy cutter, degreasing the machined ceramic green body in a glue removing furnace, heating to 600 ℃ at the speed of 0.6 ℃/min, keeping the temperature for 1h, heating to 1600 ℃ at the speed of 3 ℃/min, and keeping the temperature for 2 h.
The results show that the ceramic rods with the diameters of 15mm and 35mm have no cracking phenomenon in the drying and heat treatment processes, the sintering relative densities are 99% and 98%, respectively, and the ceramic rods with other diameters have obvious cracking after being dried. The ceramic rods with the diameters of 15mm and 35mm are selected to be subjected to green body processing tests according to the processing conditions in the embodiment 1, and the results show that no corner collapse phenomenon occurs during thread processing, the damage to the cutter is less, and the processing performance is improved.
Example 3:
weighing 3g of methacrylamide and 0.6g of MBAM, putting the methacrylamide and the MBAM into a beaker, adding 20g of deionized water to fully dissolve the methacrylamide and the MBAM, then adding 2g of ammonium citrate to fully stir, adjusting the pH of a system to be 8-11 by using ammonia water, then adding 0.9g of glycerol and 0.3ml of 10% APS into the solution to stir uniformly, adding 100g of the silica-coated ceramic powder prepared in the embodiment 2, ultrasonically dispersing for 30min at room temperature, then adding 0.03g of TEMED, rapidly stirring, and then removing bubbles dissolved in ceramic slurry in vacuum; then carefully injecting the ceramic slurry into a mold, and placing the mold in a water bath kettle at 50-80 ℃ to heat for 5-15 min to obtain a solidified ceramic wet blank; water cooling the mould, demoulding to obtain wet ceramic rod blanks with diameters of 15mm, 35mm, 40mm, 43mm and 45mm respectively; soaking the ceramic rod wet blank into an ethanol water solution for 12 hours, then placing the ceramic rod wet blank into a constant-temperature constant-humidity drying box with the temperature of 40 ℃ and the relative humidity of 92% for drying for 48 hours, and then placing the ceramic rod wet blank into a constant-temperature constant-humidity drying box with the temperature of 80 ℃ and the relative humidity of 20% for drying for 12 hours; and after drying, machining the ceramic thread of M8 by using a lathe green body by using a hard alloy cutter, degreasing the machined ceramic green body in a glue removing furnace, heating to 600 ℃ at the speed of 0.6 ℃/min, keeping the temperature for 1h, and heating to 1600 ℃ at the speed of 3 ℃/min, and keeping the temperature for 2 h.
The results showed that the ceramic rods with diameters of 15mm, 35mm and 40mm did not crack during drying and heat treatment, the sintered relative densities were 99%, 98% and 97%, respectively, and the ceramic rods with other diameters cracked significantly after drying. The ceramic rods with the diameters of 15mm and 35mm are selected to be subjected to green body processing tests according to the processing conditions in the embodiment 1, and the results show that no corner collapse phenomenon occurs during thread processing, the damage to the cutter is less, and the processing performance is improved.
Example 4:
weighing 3g of methacrylamide and 0.6g of MBAM, putting the methacrylamide and the MBAM into a beaker, adding 18g of deionized water to fully dissolve the methacrylamide and the MBAM, then adding 2g of ammonium citrate and 2g of ethanol to fully stir, adjusting the pH of a system to be 8-11 by using ammonia water, then adding 0.9g of glycerol and 0.3ml of 10% APS into the solution to stir uniformly, adding 100g of the silicon dioxide coated ceramic powder prepared in the embodiment 2, adding 0.03g of TED after performing ultrasonic dispersion for 30min at room temperature, rapidly stirring, and removing bubbles dissolved in ceramic slurry in vacuum; then carefully injecting the ceramic slurry into a mold, and placing the mold in a water bath kettle at 50-80 ℃ to heat for 5-15 min to obtain a solidified ceramic wet blank; water cooling the mould, demoulding to obtain wet ceramic rod blanks with diameters of 15mm, 35mm, 40mm, 43mm and 45mm respectively; soaking the ceramic rod wet blank into an ethanol water solution for 12 hours, then placing the ceramic rod wet blank into a constant-temperature constant-humidity drying box with the temperature of 40 ℃ and the relative humidity of 92% for drying for 48 hours, and then placing the ceramic rod wet blank into a constant-temperature constant-humidity drying box with the temperature of 80 ℃ and the relative humidity of 20% for drying for 12 hours; and after drying, machining the ceramic thread of M8 by using a lathe green body by using a hard alloy cutter, degreasing the machined ceramic green body in a glue removing furnace, heating to 600 ℃ at the speed of 0.6 ℃/min, keeping the temperature for 1h, and heating to 1600 ℃ at the speed of 3 ℃/min, and keeping the temperature for 2 h.
The results showed that the ceramic rods with diameters of 15mm, 35mm and 40mm did not crack during drying and heat treatment, the sintered relative densities were 99%, 99% and 97%, the ceramic rods with diameters of 43mm cracked slightly after drying, and the ceramic rods with diameters of 45mm cracked significantly after drying. The ceramic rods with the sample diameters of 15mm and 35mm are selected to be subjected to green body processing tests according to the processing conditions in the embodiment 1, and the results show that no corner collapse phenomenon occurs during thread processing, the damage to the cutter is less, and the processing performance is improved.
Example 5:
weighing 3g of methacrylamide and 0.6g of MBAM, putting the methacrylamide and the MBAM into a beaker, adding 20g of deionized water to fully dissolve the methacrylamide and the MBAM, then adding 2g of ammonium citrate and 2g of ethanol to fully stir, adjusting the pH of a system to be 8-11 by using ammonia water, adding 0.9g of glycerol into the solution to stir uniformly, adding 100g of the silica-coated ceramic powder prepared in the embodiment 2, adding 0.3ml of 10% APS and 0.03g of TED after performing ultrasonic dispersion for 30min at room temperature, rapidly stirring, and removing bubbles dissolved in ceramic slurry in vacuum; then carefully injecting the ceramic slurry into a mold, and placing the mold in a water bath kettle at 50-80 ℃ to heat for 5-15 min to obtain a solidified ceramic wet blank; water cooling the mould, demoulding to obtain wet ceramic rod blanks with diameters of 15mm, 35mm, 40mm, 43mm and 45mm respectively; soaking the ceramic rod wet blank into an ethanol water solution for 12 hours, then placing the ceramic rod wet blank into a constant-temperature constant-humidity drying box with the temperature of 40 ℃ and the relative humidity of 92% for drying for 48 hours, and then placing the ceramic rod wet blank into a constant-temperature constant-humidity drying box with the temperature of 80 ℃ and the relative humidity of 20% for drying for 12 hours; and after drying, machining the ceramic thread of M8 by using a lathe green body by using a hard alloy cutter, degreasing the machined ceramic green body in a glue removing furnace, heating to 600 ℃ at the speed of 0.6 ℃/min, keeping the temperature for 1h, and heating to 1600 ℃ at the speed of 3 ℃/min, and keeping the temperature for 2 h.
The results showed that the ceramic rods with diameters of 15mm, 35mm and 40mm did not crack during drying and heat treatment, the sintered relative densities were 99%, 99% and 98%, respectively, and the ceramic rods with other diameters all cracked slightly after drying. The ceramic rods with the diameters of 15mm and 35mm are selected to be subjected to green body processing tests according to the processing conditions in the embodiment 1, and the results show that no corner collapse phenomenon occurs during thread processing, the damage to the cutter is less, and the processing performance is improved.
Example 6
Adding 10g of ceramic powder into a mixed solution of 100ml of ethanol and 4ml of water, dropwise adding 0.5g of polyvinylpyrrolidone (PVP) and 0.4g of ammonia water while stirring, then ultrasonically dispersing at room temperature, then adding 6ml of ethyl orthosilicate into the solution under the condition of continuous stirring, reacting at room temperature for 4-24 h, and centrifugally drying to obtain the silicon dioxide coated ceramic powder.
Weighing 3g N-hydroxymethyl acrylamide and 0.5g of PEGDAM, putting the weighed materials into a beaker, adding 20g of deionized water to fully dissolve the materials, then adding 2g of PAA and 2.6g of polyethylene glycol 200 to fully stir, adjusting the pH of a system to be 8-11 by using ammonia water, adding 0.8g of triethylene glycol acetate into the solution to stir uniformly, adding 100g of silicon dioxide coated ceramic powder, performing ultrasonic dispersion at room temperature for 30min, adding 0.3ml of 10% AZIP and 0.03g of TEMED, quickly stirring, and removing bubbles dissolved in ceramic slurry in vacuum; then carefully injecting the ceramic slurry into a mold, and placing the mold in a water bath kettle at 50-80 ℃ to heat for 5-15 min to obtain a solidified ceramic wet blank; water cooling the mould, demoulding to obtain wet ceramic rod blanks with diameters of 15mm, 35mm, 40mm, 43mm and 45mm respectively; soaking the ceramic rod wet blank into an ethanol water solution for 12 hours, then placing the ceramic rod wet blank into a constant-temperature constant-humidity drying box with the temperature of 40 ℃ and the relative humidity of 92% for drying for 48 hours, and then placing the ceramic rod wet blank into a constant-temperature constant-humidity drying box with the temperature of 80 ℃ and the relative humidity of 20% for drying for 12 hours; and after drying, machining the ceramic thread of M8 by using a lathe green body by using a hard alloy cutter, degreasing the machined ceramic green body in a glue removing furnace, heating to 600 ℃ at the speed of 0.6 ℃/min, keeping the temperature for 1h, and heating to 1600 ℃ at the speed of 3 ℃/min, and keeping the temperature for 2 h.
The results showed that the ceramic rods with diameters of 15mm, 35mm and 40mm did not crack during drying and heat treatment, the sintered relative densities were 99%, 99% and 98%, respectively, and the ceramic rods with other diameters all cracked slightly after drying. The ceramic rods with the diameters of 15mm and 35mm are selected to be subjected to green body processing tests according to the processing conditions in the embodiment 1, and the results show that no corner collapse phenomenon occurs during thread processing, the damage to the cutter is less, and the processing performance is improved.
It should be understood that although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the invention to the specific embodiments described. It will be appreciated by those skilled in the art that the present invention may be modified or substituted equally as well to achieve the same technical result; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (6)
1. The toughened ceramic gel injection molding method is characterized by comprising the following steps of:
(1) adding a ceramic raw material into a ball milling tank, grinding the ceramic raw material into ceramic powder of 0.1-1 mu m, adding the ceramic powder into a mixed solution of ethanol and water, dropwise adding polyvinylpyrrolidone (PVP) and ammonia water while stirring, then ultrasonically dispersing at room temperature, then adding ethyl orthosilicate into the solution under the condition of continuous stirring, reacting at room temperature for 4-24 h, and centrifugally drying to obtain silicon dioxide coated ceramic powder; the volume ratio of the ethanol to the water to the ethyl orthosilicate is (20-50): 1 (1-2), the volume ratio of the water to the ammonia water is (2-10): 1, the ceramic powder accounts for 1-10 wt% of the whole system, and the PVP accounts for 1-5 wt% of the ceramic powder;
(2) weighing an organic monomer and a crosslinking agent, putting the organic monomer and the crosslinking agent into a beaker, adding deionized water to fully dissolve the organic monomer and the crosslinking agent, then adding a dispersing agent and an aqueous cosolvent, fully stirring, adjusting the pH of the system to be 8-11 by using ammonia water, adding a plasticizer and an initiator into the solution, uniformly stirring, adding the silicon dioxide coated ceramic powder in the step (1), performing ultrasonic dispersion for 10-30 min at room temperature, adding a catalyst, rapidly stirring, and removing bubbles dissolved in ceramic slurry in vacuum; the ceramic slurry comprises 1-3 wt% of organic monomers, 1 (5-30) of a cross-linking agent and the organic monomers, 8-20 wt% of deionized water, 0.5-2 wt% of a dispersing agent, 0-10 wt% of a water-based cosolvent, 20-50 wt% of an organic monomer, 0.01-1 wt% of an initiator and 0.01-1 wt% of a catalyst, wherein the mass ratio of the cross-linking agent to the organic monomers is 1;
(3) carefully injecting the ceramic slurry in the step (2) into a mold, and placing the mold in a water bath kettle at 50-80 ℃ to heat for 5-15 min to obtain a solidified ceramic wet blank; water-cooling the mold, demolding to obtain a ceramic wet blank, immersing the ceramic wet blank into an ethanol water solution for 12 hours, then placing the ceramic wet blank in a constant-temperature and constant-humidity drying box with the temperature of 40 ℃ and the relative humidity of 92% for drying for 48 hours, and then placing the ceramic wet blank in a constant-temperature and constant-humidity drying box with the temperature of 80 ℃ and the relative humidity of 20% for drying for 12 hours; and after drying, machining the ceramic thread of M8 on a green body of the lathe by using a hard alloy cutter, degreasing the machined ceramic green body in a glue removing furnace, heating to 600 ℃ at a speed of 0.6 ℃/min, preserving heat for 1h, heating to 1600 ℃ at a speed of 3 ℃/min, preserving heat for 2h to obtain a ceramic product, and finally performing quality detection.
2. The method of claim 1, wherein the organic monomer is any one of acrylamide, N-methylolacrylamide, N-N' methylenebisacrylamide, methacrylamide, acrylic acid, methacrylic acid, and hydroxyethyl acrylate; the cross-linking agent is methylene bisacrylamide or poly (vinyl glycol) dimethylacrylic acid.
3. The method of claim 1, wherein the dispersant is any one of citric acid, ammonium citrate, hydroxymethyl cellulose, polyacrylic acid and its copolymer, and polyethyleneimine; the aqueous cosolvent is any one of ethanol, ethylene glycol, n-propanol, 1, 2-propylene glycol, n-butanol, 1, 4-butanediol, 1, 6-hexanediol, diethylene glycol, triethylene glycol, polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600 and glycerol.
4. The method of claim 1, wherein the plasticizer is selected from the group consisting of polyethylene glycol, polymethacrylamide, glycerol, and triethylene glycol acetate; the initiator is any one of ammonium persulfate, hydrogen peroxide and azo [ 2-imidazoline-2-propane ] hydrochloride.
5. The method of claim 1, wherein the catalyst is tetramethylethylenediamine.
6. The toughened ceramic gel injection molding method of claim 1 wherein said ceramic powder is alumina, zirconia, silicon nitride or aluminum titanate.
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| CN112521161B (en) * | 2020-12-15 | 2022-08-30 | 无锡特科精细陶瓷有限公司 | Gel injection molding method of aluminum oxide-zirconium dioxide complex phase ceramic |
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