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Ceramic slurry and ceramic shell, and preparation methods thereof

A ceramic shell and ceramic slurry technology, applied in the field of injection molding slurry, can solve the problems of easy cracking, warping deformation and high brittleness of the green body at the junction of thickness and thickness, achieving small deformation, reducing machining allowance, heating low temperature effect

Inactive Publication Date: 2017-03-15
DONGGUAN HUAJING POWDER METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process has the following disadvantages: 1. The green body is prone to warping and deformation after it is taken out of the mold; 2. The thickness junction of the green body structure is prone to cracks, bubbles, deformation and other defects; 3. The green body is highly brittle , prone to cracks and breakage, and subsequent shape processing cannot be performed by machining; 4. The shrinkage rate of the green body reaches more than 30% during the sintering process of subsequent processing, which is easy to cause deformation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method comprises the following steps:

[0022] S1, mixing ceramic powder and deionized water according to the ratio of solid content of 55-60% to form a solution.

[0023] S2, adding an organic monomer and a crosslinking agent to the solution; wherein, the mass of the organic monomer is 3.5 to 4.0% of the mass of the ceramic powder, and the mass ratio of the organic monomer to the crosslinking agent is (10 to 15): 1.

[0024] Preferably, this step also includes adding a thermosetting epoxy resin or a thermosetting acrylic resin in an amount of 1 / 15-1 / 10 of the mass of the organic monomer. By adding a certain amount of thermosetting epoxy resin and thermosetting acrylic resin, the subsequent thermal curing effect can be enhanced.

[0025] S3, after adjusting the pH value of the solution to 9-9.5, adding a dispersant whose mass is 0.55-0.6% of the mass of the ceramic powder.

[0026] In this step, a pH adjuster, such as ammonium hydroxide, is first adde...

experiment example 1

[0039] 1. Take 100kg of zirconia ceramic powder, and mix the zirconia ceramic powder with deionized water according to the ratio of solid content of 55%.

[0040] 2. Add 3.5kg of acrylamide (organic monomer) and 0.23kg of N,N'methylenebisacrylamide (crosslinking agent). In addition, 0.35 kg of thermosetting epoxy resin was added as a thermosetting agent.

[0041]3. Add ammonium hydroxide to adjust the pH value of the solution to weak alkalinity, and add 0.55 kg of dispersant polyethylene glycol.

[0042] 4. After mixing the above raw materials in proportion, mill them in a ball mill for 20-24 hours, and use zirconia balls as the grinding balls.

[0043] 5. After the ball milling is completed, vacuum stir the slurry to remove tiny air bubbles in the slurry.

[0044] 6. Adding 1.0% by mass (organic monomer + crosslinking agent), that is, 37.3 g of catalyst TEMED.

[0045] 7. Prepare the initiator sodium persulfate into a solution with a mass percentage of 10%, and add it to t...

experiment example 2

[0053] 1. Take 100kg of zirconia ceramic powder, and mix the zirconia ceramic powder with deionized water according to the ratio of solid content of 60%.

[0054] 2. Add 4kg of acrylamide (organic monomer) and 0.4kg of N,N'methylenebisacrylamide (crosslinking agent). In addition, 0.4 kg of a thermosetting acrylic resin was added as a thermosetting agent.

[0055] 3. Add ammonium hydroxide to adjust the pH value of the solution to weak alkalinity, and add 0.6 kg of dispersant polyethylene glycol.

[0056] 4. After mixing the above raw materials in proportion, mill them in a ball mill for 20-24 hours, and use zirconia balls as the grinding balls.

[0057] 5. After the ball milling is completed, vacuum stir the slurry to remove tiny air bubbles in the slurry.

[0058] 6. Add 1.5% of (organic monomer + crosslinking agent) mass percent, that is, 66 g of catalyst TEMED.

[0059] 7. Prepare the initiator sodium persulfate into a solution with a mass percentage of 10%, and add it t...

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Abstract

The invention discloses a ceramic slurry and ceramic shell, and preparation methods thereof. The preparation method for the ceramic shell comprises the following steps: S1, mixing ceramic powder with deionized water according to a solid content of 55 to 60% so as to form a solution; S2, adding organic monomer and a cross-linking agent into the solution; S3, adjusting the pH value of the solution to 9 to 9.5 and then adding a dispersing agent accounting for 0.55 to 0.6% of the mass of the ceramic powder; S4, carrying out sufficient ball milling so as to form slurry and carrying out vacuum stirring to remove bubbles in the slurry; S5, adding a catalyst accounting for 1 to 1.5% of the sum of the mass of the organic monomer and the cross-linking agent into the slurry; S6, adding an initiator into the slurry; S7, injecting the slurry into the mold cavity of an injection machine, carrying out heating at 50 to 80 DEG C for curing and molding and taking a molded green body from the mold cavity; and S8, processing the molded green body so as to obtain the ceramic shell. The ceramic green body prepared in the invention is not prone to deformation and has high strength and small sintering contraction.

Description

[0001] 【Technical field】 [0002] The invention relates to injection molding slurry, in particular to a ceramic slurry, a ceramic shell and a preparation method thereof. [0003] 【Background technique】 [0004] Ceramic materials have many excellent properties such as wear resistance, corrosion resistance, high strength, high toughness, and good thermal stability. Compared with metals and plastics, ceramic materials have high Mohs hardness, high dielectric constant, no signal shielding and good biocompatibility. The third largest appearance structural material after metal. [0005] Currently, when preparing a shell of ceramic material, the ceramic raw material powder is kneaded and granulated with paraffin wax, organic matter, etc., to form solid particles with a diameter of 3-5 mm. When molding, add granular raw materials into the injection molding machine, heat and melt the particles through the heating device of the injection molding machine, and inject the hot-melted raw m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/632C04B35/634
CPCC04B35/632C04B35/63424C04B35/63452C04B2235/48
Inventor 张宁谢庆丰彭毅萍
Owner DONGGUAN HUAJING POWDER METALLURGY
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