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Preparation method of special-shape ceramic

A technology of ceramics and green bodies, which is applied in the field of preparation of special-shaped ceramics. It can solve the problems of reduced fracture toughness and high-temperature performance, severe toxicity of organic solvents, and harm to the human body and the environment. big investment effect

Active Publication Date: 2014-09-03
BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, in all the literature reports, the degreasing time of the adopted method is long and the efficiency is low; the organic solvent adopted is highly toxic, causing harm to the human body and the environment; , Oxidation of the surface of silicon carbide green body powder reduces its fracture toughness and high temperature performance, thus limiting the application of ceramic materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] In this embodiment, the sintering aids are magnesia and alumina, the surfactants are oleic acid and magnesium stearate, and the organic binders are polymethyl methacrylate, polyethylene wax, microcrystalline paraffin, polyoxyethylene , The molecular weight is the polyethylene glycol of 20000.

[0057] After mixing 1520g of silicon nitride ceramic powder and sintering aid, add 20g of magnesium stearate, 20g of oleic acid, 33g of polymethyl methacrylate, 33g of polyethylene wax, 198g of polyethylene glycol with a molecular weight of 20000, paraffin wax 88g, polyoxyethylene 44g, molecular weight is the polyethylene glycol 44g of 6000, injection molding after mixing.

[0058] The injection-molded ceramic green body is placed in an autoclave, immersed in a solvent and then sealed. Wherein, the solvent is a mixture of gasoline and ethyl acetate, the weight ratio of gasoline and ethyl acetate is 1:0.5, and the volume ratio of green body and solvent is 1:10. Finally, 0.1Mpa n...

Embodiment 2

[0063] In this embodiment, the sintering aids are lanthanum oxide and samarium oxide, triglycerol monostearate and elaidic acid are selected as surfactants, and polyethylene wax, paraffin wax, and polyethylene glycol with a molecular weight of 10,000 are selected as organic binders. alcohol.

[0064] After mixing 1760g of silicon carbide ceramic powder and sintering aid, add 10g of triglycerol monostearate, 10g of elaidic acid, 11g of polyethylene wax, 99g of polyethylene glycol with a molecular weight of 10000, and 110g of paraffin wax. Injection molding.

[0065] The injection-molded ceramic green body is placed in an autoclave, immersed in a solvent and then sealed. Wherein, the solvent is a mixture of ethanol, acetone and turpentine, the weight ratio of ethanol, acetone and turpentine is 1:0.8:0.2, and the volume ratio of green body to solvent is 1:30. Finally, 0.1Mpa of nitrogen is introduced as a protective gas, and then the temperature is raised to 70°C at a rate of 1...

Embodiment 3

[0070] In this embodiment, the sintering aids are cerium oxide and yttrium oxide, liquid wax and oleic acid are selected as surfactants, and polymethyl methacrylate, polyethylene wax, paraffin wax, white wax, and polyethylene with a molecular weight of 10,000 are selected as organic binders. diol.

[0071] After mixing 1600g of aluminum oxynitride ceramic powder and sintering aid, add 20g of liquid wax, 80g of oleic acid, 15g of polyethylene wax, 15g of polymethyl methacrylate, and 90g of polyethylene glycol with a molecular weight of 10000, and knead Post-injection molding.

[0072] The injection-molded ceramic green body is placed in an autoclave, immersed in a solvent and then sealed. Among them, the solvent is a mixture of diesel oil, methanol and ethyl acetate, the weight ratio of diesel oil, methanol and ethyl acetate is 0.4:0.8:1, and the volume ratio of green body to solvent is 1:50. Finally, 0.1Mpa of nitrogen is introduced as a protective gas, and then the temperat...

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Abstract

The invention provides a preparation method of an injection-moulded special-shape ceramic. The preparation method comprises the following ceramic green body degreasing steps: (1) immerging a ceramic green body into a solvent, sealing, maintaining at 40-70 DEG C and the pressure of 0.2-0.6 Mpa for 2-6 hours, and then taking out the ceramic green body; (2) airing the ceramic green body obtained from the step (1), then placing into embedding powder, drying at 180-200 DEG C, and naturally cooling; (3) heating the ceramic green body obtained from the step (2) to 300-400 DEG C, and maintaining at the pressure of 0.1-0.5 Mpa for 1-2.5 hours. The preparation method provided by the invention can be used for fast degreasing at low temperature by adopting an organic solvent without toxicity or hydrolytic oxidation, is simple in process operation, high in production efficiency and suitable for batched and automatic production, and can be used for improving the working environment and preventing the damage of toxic organic substance volatilization on the environment.

Description

technical field [0001] The invention belongs to the field of engineering ceramics, and relates to a method for preparing special-shaped ceramics, in particular to a method for preparing injection-molded special-shaped ceramics. Background technique [0002] Silicon nitride, aluminum nitride, aluminum oxynitride, and silicon carbide ceramics are advanced non-oxide ceramic materials with high hardness, high strength, good thermal shock resistance, high temperature resistance, and adjustable thermal conductivity. Performance, widely used in high-end mechanical parts materials, wear-resistant devices, sealing devices, etc. [0003] Non-oxide ceramic materials are different from the raw materials of traditional daily-use ceramics and architectural ceramics. The raw materials are all artificially synthesized ridge powders, lacking natural clay and other bonding components, while traditional dry pressing and cold isostatic pressing molding methods It is only suitable for preparing...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 张伟儒孙峰王腾飞庄新江田庭燕陈波张哲
Owner BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD
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