Method for preparing ceramic material with high strength and toughness by thermal cracking of silica gel and inorganic filling material compound

A technology of inorganic fillers and ceramic materials, applied in the field of inorganic composite materials, can solve the problems of difficult forming of ceramic structural parts and high processing requirements, and achieve the effects of easy grinding and trimming, increasing density and widening area.

Active Publication Date: 2019-11-12
SHANGHAI LEVSON ENTERPRISE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of difficult molding and high processing requirements of special-shaped complex ceramic structural parts, the present invention provides a method for preparing high-strength and tough ceramic materials from pyrolysis silica gel and inorganic filler composites, using a small amount of vulcanizable liquid two-component addition type silicone rubber as "Plasticizer" is mechanically mixed with inorganic filler compound under certain conditions to prepare green body material with good "plasticizing" property. The green body material is added to a mold with a specific shape, and hot die-casting can be obtained The structure is complex and can be easily ground and repaired original green body parts; or direct large-scale or block-shaped hot-pressed castings are formed, and then CNC-processed components with special-shaped structures on the prepared green body pieces or green body blocks

Method used

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  • Method for preparing ceramic material with high strength and toughness by thermal cracking of silica gel and inorganic filling material compound
  • Method for preparing ceramic material with high strength and toughness by thermal cracking of silica gel and inorganic filling material compound

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Compounding and surface treatment of inorganic fillers:

[0038] Choose from 4 different particle sizes of spherical or spherical Al 2 o 3 The powder filler is mixed and piled up in a way that conforms to the packing theory of the Alfred compact equation, and the Al 2 o 3 The average particle size of each filler powder is ≤120um, the maximum particle size is ≤150um, and the particle size distribution is narrow. in Al 2 o 3 During the wetting process of the powder filler, during the stacking and mixing process, while mixing the filler, the compatibilizer CH dissolved in 95% ethanol solution 2 =CH-(CH 2 ) 3 -Si-(OCH 3 ) 3 It is sprayed on the surface of powder filler in the form of spray, and the mass ratio of filler mass to compatibilizer is controlled at 1000:1.

[0039] (2) Uniform dispersion and mixing of liquid silicone rubber and inorganic fillers after compounding and surface treatment:

[0040] The selected viscosity is 500mpa s, the two-component a...

Embodiment 2

[0048] (1) Compounding and surface treatment of inorganic fillers:

[0049] Choose 3 kinds of spherical or quasi-spherical SiC powder fillers with different particle sizes for mixed accumulation in accordance with the horsfield and fuller dense packing theory, and the average particle size of each SiC filler powder is ≤120um, and the maximum particle size is ≤150um. The particle size distribution is narrow. During the wetting treatment and stacking mixing process of the SiC powder filler, while mixing the filler, the compatibilizer CH dissolved in 95% ethanol solution 2 =C(CH 3 )COO-(CH 2 ) 3 -Si-(OCH 3 ) 3 It is sprayed on the surface of powder filler in the form of spray, and the mass ratio of filler mass to compatibilizer is controlled at 1000:8.

[0050] (2) Uniform dispersion and mixing of liquid silicone rubber and inorganic fillers after compounding and surface treatment:

[0051] Select a two-component addition type vulcanized liquid silicone rubber with a visco...

Embodiment 3

[0059] (1) Compounding and surface treatment of inorganic fillers:

[0060] Choose 3 kinds of spherical or quasi-spherical BN powder fillers with different particle sizes to carry out mixed accumulation in accordance with the horsfield and fuller dense packing theory, and the average particle size of each of the BN filler powders is ≤120um, and the maximum particle size is ≤150um , a narrow particle size distribution. During the wetting treatment and stacking mixing process of the BN powder filler, while mixing the filler, the compatibilizer CH dissolved in 95% ethanol solution 2 =CH-(CH 2 ) 3 -Si-(OCH 3 ) 3 It is sprayed on the surface of powder filler in the form of spray, and the mass ratio of filler mass to compatibilizer is controlled at 1000:10.

[0061] (2) Uniform dispersion and mixing of liquid silicone rubber and inorganic fillers after compounding and surface treatment:

[0062] Select a two-component addition-type vulcanized liquid silicone rubber with a visc...

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Abstract

The invention provides a method for preparing a ceramic material with high strength and toughness by thermal cracking of a silica gel and inorganic filling material compound, and belongs to the fieldof inorganic composite materials. The method comprises the following steps: (1) blending and surface treatment of an inorganic filling material; (2) uniform dispersion and mixing of liquid silicone rubber and a surface-treated inorganic filling material; (3) low-temperature hot-pressing vulcanization of a mixed silicone rubber/inorganic filling material compound; (4) preliminary hot-pressing cracking of a vulcanized silicone rubber/inorganic filling material compound; and (5) further ceramic sintering of a silicone rubber/inorganic filling material compound having undergone hot-pressing cracking under a condition of a high temperature to finally obtain a ceramic material product with high strength and toughness.

Description

technical field [0001] The invention provides a method for preparing high-strength and tough ceramic materials by pyrolyzing silica gel-inorganic filler composites, which involves a composite method of organic polymer materials and inorganic materials. A high-strength and tough ceramic material belongs to the field of inorganic composite materials. Background technique [0002] Ceramic materials are a kind of inorganic non-metallic materials with a long history and various categories in our country. Since the beginning of the new century, advanced structural ceramic materials have become the material basis for modern high-tech, emerging industries and traditional industrial technology transformation and upgrading; mechanical ceramics, thermal engine ceramics, Biochemical ceramics, sensor material ceramics, nuclear ceramics, etc., with the continuous advancement of science and technology, various preparation and synthesis methods have emerged. It is an eternal task for resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/565C04B35/583C04B35/622C04B35/626
CPCC04B35/10C04B35/565C04B35/583C04B35/622C04B35/62605C04B2235/6581
Inventor 贺祖章张燕萍赵志国
Owner SHANGHAI LEVSON ENTERPRISE GRP
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