Method for preparing high-toughness titanium silicon carbide-silicon carbide multiphase ceramic special-shaped components

A technology of titanium silicon carbide and multiphase ceramics, applied in the direction of ceramic forming lining, coating, etc., can solve the problems of difficult to realize the preparation of complex-shaped silicon carbide products, high sintering temperature, and high processing difficulty, achieve low sintering temperature, shorten production Process, the effect of reducing production costs

Active Publication Date: 2018-01-23
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the sintering temperature of atmospheric pressure sintering, hot pressing sintering, hot isostatic pressing sintering and other sintering processes can reach as high as 2000 ° C, and the sintering shrinkage rate is about 15%, which makes it difficult to realize the preparation of silicon carbide products with complex shapes.
Silicon carbide ceramics have high hardness and rigidity, high processing difficulty and long cycle, so sintered products are required to have high dimensional accuracy

Method used

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  • Method for preparing high-toughness titanium silicon carbide-silicon carbide multiphase ceramic special-shaped components
  • Method for preparing high-toughness titanium silicon carbide-silicon carbide multiphase ceramic special-shaped components
  • Method for preparing high-toughness titanium silicon carbide-silicon carbide multiphase ceramic special-shaped components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) disperse 110g carbon black, 55g titanium carbide powder (average particle diameter 2 microns), 22g titanium powder (average particle diameter 3 microns) and 4g polyvinyl alcohol, 6g sodium carboxymethyl cellulose in deionized water, then Ball milling for 24h to obtain ceramic slurry;

[0035] 2) Move the ceramic slurry into a vacuum container, vacuumize and degas under 10Pa, then slowly inject the slurry into a plaster mold, and dry for 3 days after demoulding to obtain a special-shaped green body;

[0036] 3) Move the special-shaped blank into the vacuum sintering furnace, evenly spread a certain amount of high-purity silicon powder on the top of the blank (the amount of silicon is 1.3 times the amount of silicon required for the silicon-carbon chemical reaction), and then carry out infiltration-reaction sintering , the sintering temperature is 1680°C, the holding time is 1.5 hours (the furnace is evacuated to 15Pa when the temperature is lower than 800°C during the...

Embodiment 2

[0038] 1) 100g carbon black, 60g titanium carbide powder (average particle diameter 2 microns), 24g titanium powder (average particle diameter 4 microns) and 6g polyvinyl alcohol, 10g sodium carboxymethyl cellulose are uniformly dispersed in deionized water, then Ball milling for 24h to obtain ceramic slurry;

[0039] 2) Move the ceramic slurry into a vacuum container, vacuumize and degas under 10Pa, then slowly inject the slurry into a plaster mold, and dry for 3 days after demoulding to obtain a special-shaped green body;

[0040] 3) Move the special-shaped blank into the vacuum sintering furnace, evenly spread a certain amount of high-purity silicon powder on the top of the blank (the amount of silicon is 1.3 times the amount of silicon required for the silicon-carbon chemical reaction), and then carry out infiltration-reaction sintering , the sintering temperature is 1660°C, and the holding time is 1 hour (the furnace is evacuated to 12Pa when the temperature is lower than...

Embodiment 3

[0042] 1) disperse 120g carbon black, 50g titanium carbide powder (average particle diameter 1 micron), 17g titanium powder (average particle diameter 2 micron) and 5g polyvinyl alcohol, 8g sodium carboxymethyl cellulose in deionized water, then Ball milling for 24h to obtain ceramic slurry;

[0043] 2) Move the ceramic slurry into a vacuum container, vacuumize and degas under 10Pa, then slowly inject the slurry into a plaster mold, and dry for 3 days after demoulding to obtain a special-shaped green body;

[0044] 3) Move the special-shaped blank into the vacuum sintering furnace, evenly spread a certain amount of high-purity silicon powder on the top of the blank (the amount of silicon is 1.3 times the amount of silicon required for the silicon-carbon chemical reaction), and then carry out infiltration-reaction sintering , the sintering temperature is 1690°C, and the holding time is 1 hour (the furnace is evacuated to 18Pa when the temperature is lower than 800°C during the ...

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Abstract

The invention relates to a method for preparing composite ceramics, particularly discloses a method for preparing high-toughness titanium silicon carbide-silicon carbide multiphase ceramic special-shaped components, and belongs to the field of technologies for preparing ceramic materials. The method includes steps of uniformly dispersing carbon black, titanium carbide powder, titanium powder, dispersing agents and plasticizers and then carrying out high-speed ball-milling to obtain ceramic slurry; degassing the ceramic slurry under the vacuum conditions, then slowly injecting the ceramic slurry into gypsum molds and drying the ceramic slurry to obtain special-shaped component biscuits; shifting the special-shaped component biscuits into a vacuum sintering furnace, uniformly flatly spreading high-purity silicon powder on the upper sides of the biscuits and carrying out infiltration-reaction sintering at the sintering temperatures of 1650-1700 DEG C for the heat preservation time of 1-2hours to obtain the high-toughness titanium silicon carbide-silicon carbide multiphase ceramic special-shaped components. The method has the advantage that the high-toughness titanium silicon carbide-silicon carbide multiphase ceramic special-shaped components prepared by the aid of the method are high in density and excellent in mechanical property and are particularly high in bending strength and fracture toughness.

Description

technical field [0001] The invention relates to a method for preparing composite ceramics, in particular to a method for preparing high-toughness titanium silicon carbide-silicon carbide multiphase ceramic special-shaped parts, and belongs to the technical field of ceramic material preparation. Background technique [0002] Silicon carbide ceramic materials have excellent properties such as light weight, high strength, good thermal conductivity, low expansion coefficient, high hardness, and oxidation resistance. They are prone to chemical reactions in severe environmental disturbances including drastic changes in temperature and humidity or exposure to corrosive and other It has very good dimensional stability in the environment, so it has been widely used in aviation, aerospace, automobile, machinery, petrochemical, metallurgy and electronics industries. Since most silicon carbide products are high value-added products with broad market prospects, they have been valued by m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/65B28B7/36C09D191/00C09D7/65C09D7/61C04B28/14
Inventor 李双魏春城刘爱菊孟子霖张茜
Owner SHANDONG UNIV OF TECH
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