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Preparation method of slip-cast M-Sialon combined silicon carbide ceramic riser tube

A technology of silicon carbide ceramics and grouting molding, which is applied in the field of ceramic material preparation, can solve the problems of not meeting the production needs, short service life, high price, etc., and achieve the effect of improving service life, improving thermal shock resistance, and tight combination

Inactive Publication Date: 2019-08-20
DONGYING XINKEXINTETAO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum yttrium and silicon nitride combined with silicon carbide ceramic risers have a short service life and cannot meet production needs, while the price of Sialon ceramic risers or silicon nitride ceramic risers is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Preparation of mixed powder: Alumina powder with a particle size of 0.5 μm: quartz glass powder with a particle size of 0.5 μm: metal aluminum powder with a particle size of 3 μm: metal silicon powder with a particle size of 3 μm in a weight percentage of 10:40 : The ratio of 25:25 plus 1% yttrium dioxide of the sum of the weight of the above four components is uniformly mixed to make a mixed powder;

[0017] (2) Preparation of mixed solution: uniformly mix alumina sol with 30% alumina content: silica sol with 30% silica content: water at a weight percentage of 10:10:80 to make a mixed solution;

[0018] (3) Preparation of mixed slurry: uniformly mix mixed powder: silicon carbide powder: mixed solution at a weight percentage of 60:10:30 to make a mixed slurry, wherein the particle size of silicon carbide powder is 3 μm;

[0019] (4) Preparation of grouting molding M-sialon combined with silicon carbide ceramic riser body: inject the mixed slurry into the plaster mol...

Embodiment 2

[0022] (1) Preparation of mixed powder: Alumina powder with a particle size of 1.5 μm: quartz glass powder with a particle size of 1.5 μm: metal aluminum powder with a particle size of 10 μm: metal silicon powder with a particle size of 10 μm in a weight percentage of 20:50 : The ratio of 15:15 plus 8% yttrium dioxide of the sum of the weight of the above four components is evenly mixed to make a mixed powder;

[0023] (2) Preparation of mixed solution: uniformly mix alumina sol with 20% alumina content: silica sol with 20% silica content: water at a weight percentage of 28:28:44 to make a mixed solution;

[0024] (3) Preparation of mixed slurry: uniformly mix mixed powder: silicon carbide powder: mixed solution at a weight percentage of 40:20:40 to make a mixed slurry, wherein the particle size of silicon carbide powder is 1mm;

[0025] (4) Preparation of grouting molding M-sialon combined with silicon carbide ceramic riser body: inject the mixed slurry into the plaster mold ...

Embodiment 3

[0028] (1) Preparation of mixed powder: alumina powder with a particle size of 3 μm: quartz glass powder with a particle size of 3 μm: metal aluminum powder with a particle size of 20 μm: metal silicon powder with a particle size of 20 μm in a weight percentage of 30: 60: 5 : The ratio of 5 plus 15% yttrium dioxide of the sum of the weight of the above four components is evenly mixed to make mixed powder;

[0029] (2) Preparation of mixed solution: uniformly mix aluminum sol with 10% alumina content: silica sol with 10% silica content: water at a weight percentage of 45: 45: 10 to make a mixed solution;

[0030] (3) Preparation of mixed slurry: uniformly mix mixed powder: silicon carbide powder: mixed solution at a weight percentage of 20: 30: 50 to make a mixed slurry, wherein the particle size of silicon carbide powder is 2mm;

[0031] (4) Preparation of grouting molding M-sialon combined with silicon carbide ceramic riser body: inject the mixed slurry into the plaster mold ...

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Abstract

A preparation method of a slip-cast M-Sialon combined silicon carbide ceramic riser tube is characterized by comprising the following steps: uniformly mixing alumina, quartz glass, metallic aluminiumand metallic silicon to prepare a mixed powder, uniformly mixing alumina sol, silica sol and water to prepare a mixed solution, uniformly mixing the mixed powder, a silicon carbide powder and the mixed solution to prepare mixed slurry, and preparing the slip-cast M-Sialon combined silicon carbide ceramic riser tube by slip casting. The invention has the following advantages: by using alumina sol,silica sol, metallic silicon powder and metallic aluminium powder as the raw materials, the phases are mixed more uniformly; during sintering process, silicon nitride and aluminium nitride are generated, and the newly-generated silicon nitride and aluminium nitride have high activity such that temperature of the generated Sialon is lower; and by changing the composition and sintering temperature,the expansion coefficient of the Sialon phase is regulated to match the expansion coefficient of silicon carbide, and then service life of the M-Sialon combined silicon carbide ceramic riser tube is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a grouting M-sialon combined silicon carbide ceramic liquid riser, belonging to the technical field of ceramic material preparation. Background technique [0002] The ceramic riser is used in the aluminum alloy casting industry. It connects the casting equipment and the casting mold to form an aluminum alloy melt channel. During the production process, the aluminum alloy melt passes through the ceramic riser intermittently, so that the frequency of the ceramic riser subjected to thermal shock, The strength is high, and it is easy to cause crack damage. At present, aluminum yttrium oxide, sialon, silicon nitride, silicon oxynitride combined with silicon carbide, silicon nitride combined with silicon carbide and other ceramic risers are mainly used at home and abroad. Ceramic risers made of aluminum yttrium oxide and silicon nitride combined with silicon carbide have a short service life and cannot meet p...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/622C04B35/626
CPCC04B35/14C04B35/622C04B35/62605C04B2235/3217C04B2235/3225C04B2235/3826C04B2235/402C04B2235/428C04B2235/6022C04B2235/6567C04B2235/661
Inventor 程之勇唐竹兴程彦森白佳海何静谭立新冯锐寇连星高增丽张海艳
Owner DONGYING XINKEXINTETAO
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