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Gel casting method and preparation method of ceramic

A technology of gel injection molding and ceramic powder, which is used in ceramic molding machines, manufacturing tools, etc., can solve the problems of poor mechanical properties of ceramics, uneven surface of wet blanks, poor mechanical properties, etc., and achieve high density and bending resistance. Effects of strength, high thermal conductivity, high tensile strength and hardness

Active Publication Date: 2012-05-16
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems of the uneven surface of the wet billet, poor mechanical properties and poor mechanical properties of ceramics existing in the existing gel injection molding process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] According to the preparation method provided by the invention, the wet body is first obtained by gel injection molding, and then the wet body is degummed and sintered to obtain ceramics. The methods of debinding and sintering can adopt various methods in the prior art, which are not specifically limited in the present invention.

[0025]Preferably, the conditions for debinding include: the debinding temperature is 200-800°C, and the debinding time is 1-6h. The sintering process is controlled by a temperature program, which specifically includes: first, the temperature is raised to 1000°C within 120 minutes, then the temperature is raised to 1250°C within 25 minutes, and the temperature is kept for 20 minutes; the temperature is raised to 1850°C within 60 minutes, and the temperature is kept for 30 minutes; 60min.

Embodiment 1

[0028] 50 parts by weight of vinyl-terminated polysiloxane VM-18 with a viscosity of 1000mPa·S, 2.5 parts by weight of hydrogen-containing silicone oil VM-29 with a viscosity of 25mPa·S (the mole percentage of unit I is 82%, and the mole percentage of unit II The percentage content is 16%), 1 weight part of vinyl silicone oil VM-26 (the molar percentage content of unit III is 84%, the molar percentage content of unit IV is 14%) and 300 weight parts of toluene are mixed uniformly; Then add 950 parts by weight of silicon carbide ceramic powder with an average particle size of 10 microns, mixed uniformly; add 0.2 parts by weight of platinum complex catalyst chloroplatinic acid-divinyltetraphenylsiloxane complex, 0.05 parts by weight of crosslinking inhibitor Agent ethynyl cyclohexanol, 0.05 parts by weight of tackifier tetrabutylammonium bromide, and stir evenly to obtain a suspension; after vacuum degassing the suspension for 20 minutes, heat it to 60°C for prepolymerization for ...

Embodiment 2

[0031] 50 parts by weight of vinyl-terminated polysiloxane VM-18 with a viscosity of 1000mPa·S, 5 parts by weight of hydrogen-containing silicone oil VM-29 with a viscosity of 25mPa·S (the mole percentage of unit I is 82%, and the mole percentage of unit II The percentage content is 16%), 1 weight part of vinyl silicone oil VM-26 (the molar percentage content of unit III is 84%, the molar percentage content of unit IV is 14%), 6 weight parts of dispersant KH560 and 300 parts Mix the toluene evenly; then add 950 parts by weight of silicon carbide ceramic powder with an average particle size of 10 microns, and mix evenly; add 0.2 parts by weight of platinum complex catalyst chloroplatinic acid-divinyltetraphenylsiloxane complex, 0.05 parts by weight of cross-linking inhibitor ethynyl cyclohexanol, 0.05 parts by weight of tackifier tetrabutylammonium bromide, stir evenly to obtain a suspension; degas the suspension in vacuum for 20 minutes, heat to 60 ° C for 1 hour after prepolym...

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Abstract

The invention provides a gel casting method, comprising the following steps of: firstly degassing and pre-polymerizing suspensoid containing ceramic powder and organic system to obtain ceramic size; pouring the ceramic size into a mould, drying and then curing in situ, and demoulding to obtain gel-cast wet blank, the organic system contains 100 parts by weight of vinyl-terminated polyorganosiloxane, 2-10 parts by weight of hydrogen-containing silicone oil, 1-10 parts by weight of vinyl silicone oil, 0.2-0.8 part by weight of platinum complex catalyst, 0.02-0.1 part by weight of crosslinking inhibitor, 0.02-0.1 part by weight of viscosifier and 100-1000 parts by weight of organic solvent. The invention also provides a method for preparing ceramic by adopting the gel casting method. The gel casting method provided by the invention has wide application fields, and the ceramic obtained by adopting the gel casting method provided by the invention has higher mechanical properties.

Description

technical field [0001] The invention relates to a gel injection molding method and a ceramic preparation method. Background technique [0002] Gel-casting is a net-size molding process following grouting and injection molding. It combines traditional ceramic technology and polymer chemistry. It has been successfully applied to Al 2 o 3 , TiN, SiC, Si 3 N 4 Industrial production of various structural ceramics. The basic principle of the gel injection molding process is to mix a low concentration of organic monomers into a ceramic slurry with a high solid content (volume fraction ≥ 50%) and low viscosity (< 1Pa·S), then add an initiator and Casting, the organic monomer in the slurry undergoes in-situ polymerization reaction under certain conditions to form a strong cross-linked network structure, and the ceramic body is shaped in situ through the in-situ solidification of the slurry; finally, it is demoulded, dried, and sintered Get the required ceramics. [0003] Sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/26C04B35/622
Inventor 沈云张玲玲林信平
Owner BYD CO LTD
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