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Method for manufacturing ultra-fine high-toughness silicon carbide ceramic material based on reaction sintering method

A silicon carbide ceramic and sintering technology is applied in the field of manufacturing ultra-fine and high-toughness silicon carbide ceramic materials, which can solve the problems of poor design of the preparation method, and achieve the effects of high toughness, reduced production cost, and ultra-fine particles.

Inactive Publication Date: 2016-03-09
FENGHUA ZHONGLI SEALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the above-mentioned deficiencies, the purpose of the present invention is to provide a method for manufacturing ultra-fine high-toughness silicon carbide ceramic materials based on the reaction sintering method in the art, so as to solve the problem of poor design of existing similar silicon carbide ceramic materials preparation methods, and obtain The particle size and toughness of silicon carbide ceramic materials need to be further improved

Method used

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  • Method for manufacturing ultra-fine high-toughness silicon carbide ceramic material based on reaction sintering method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 9g of Y to 500g of 0.50μm silicon carbide powder 2 o 3 -Al 2 o 3 -SiO 2 Component sintering Add additives and 15g of carbon powder, fully stir and mix through a mixer, pour into a solution in which 15g of liquid paraffin and 250ml of methanol have been dissolved in advance, and then go through agitation and ball milling to make mud; put the above mud in Stir in a stainless steel container with a stirrer for 12 hours, then inject the stirred slurry on an injection molding machine, and then dry and harden naturally in a cool place after molding. The biscuit formed after drying and hardening is bisque fired in a vacuum sintering furnace, and the additives and binders in the biscuit are removed. The temperature in the vacuum sintering furnace is 800 ° C, the vacuum degree is below 0.40 MPa, and sintering is carried out for 1.0 hour. A medium-strength green body can be obtained; the green body obtained above is processed into blanks of various shapes and sizes by mec...

Embodiment 2

[0027] Add 4.8g of Y to 500g of 0.86μm silicon carbide powder 2 o 3 -Al 2 o 3 -SiO 2 Component sintering Add additives and 9g of carbon powder, fully stir and mix through the mixer, pour into the solution of pre-dissolved 12g of liquid paraffin and 240ml of methanol, and then go through stirring and ball milling to make mud; put the above mud in the belt Stir in the stainless steel container of the stirrer for 15 hours, then inject the stirred slurry on an injection molding machine, and then dry and harden naturally in a cool place after molding. The biscuit formed after drying and hardening is biscuit-fired in a vacuum sintering furnace, and the additives and binders in the biscuit are removed. The temperature in the vacuum sintering furnace is 1200 ° C, the vacuum degree is below 0.40 MPa, and sintering is carried out for 2 hours. A green body with medium strength can be obtained; the above-mentioned green body is machined into various shapes and required blanks again, a...

Embodiment 3

[0029] First mix 25g liquid paraffin and 300ml methanol solution, then add 0.50μm 500g silicon carbide powder, 15g carbon powder, 7.5g Y 2 o 3 -Al 2 o 3 -SiO 2 The components are sintered and additives are added to make slurry, Y 2 o 3 -Al 2 o 3 -SiO 2 Component sintering additive is 1.5% of Y 2 o 3 -Al 2 o 3 -SiO 2 ; Then through stirring and ball milling, the mud is obtained; the green body after injection molding is cooled and dried in the air at room temperature of 20 ℃, and the green body is obtained. The green body has a certain shape and size after being molded, and the green body is Direct slices are arranged in the silicon layer for sintering, so that it can be completely immersed in the silicon vapor; sintering adopts a combination of vacuum and atmosphere, and the temperature is raised in vacuum in the low temperature area, which is higher than 1300 ° C. It is protected by an argon atmosphere to maintain the pressure in the furnace 0.12MPa; the heating ...

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Abstract

The invention relates to a method for manufacturing an ultrafine high-toughness silicon carbide ceramic material based on a reaction sintering technology. The method solves the problem that sizes and toughness of a silicon carbide ceramic material prepared by the existing similar method need to be further improved. The method comprises the following steps of adding a Y2O3-Al2O3-SiO2 ingredient sintering additive assistant and powdered carbon into silicon carbide powder nano-particles, carrying out stirring mixing by a mixer, pouring the mixture into a methanol solution of liquid paraffin, carrying out mixing ball milling to obtain slurry, stirring the slurry, carrying out injection molding by an injection molding machine, then carrying out natural hardening in the shadow, carrying out biscuit sintering on the molded biscuit by a vacuum pre-sintering furnace, removing a binder to obtain a middle-strength biscuit, processing the biscuit by a mechanical method to obtain a blank, putting the blank into a vacuum sintering furnace, and carrying out sintering in an argon protective atmosphere to obtain the submicron-scale ultrafine high-toughness silicon carbide ceramic material.

Description

technical field [0001] The invention relates to a method for manufacturing ultra-fine high-toughness silicon carbide ceramic materials based on a reaction sintering method. Background technique [0002] Silicon carbide ceramic material is a ceramic material with silicon carbide (SiC) as the main component. It has high temperature strength, strong high temperature oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient and high thermal conductivity. , high hardness, thermal shock resistance and chemical corrosion resistance and other excellent properties, it has been widely used in the fields of automobile, mechanization, environmental protection, space technology, information electronics, energy and so on. It has become a kind of excellent performance in many industrial fields. Structural ceramics that cannot be replaced by other materials. For example, in the automobile industry, in order to improve the thermal efficiency of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 方锡成方薛勇张孟荣董娟
Owner FENGHUA ZHONGLI SEALS
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