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Method for improving dispersion stability of silicon carbide powder in water system

A silicon carbide powder and dispersion stability technology, applied in the field of silicon carbide ceramics, can solve the problems of easy agglomeration and sedimentation, difficult slurry, etc., and achieve the effect of low cost, good dispersion and high stability

Active Publication Date: 2018-07-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult for silicon carbide powder to form a stable slurry in the water system, and it is easy to agglomerate and settle. Therefore, the dispersion stability of silicon carbide powder in the water system is a key issue for slip casting dip molding.

Method used

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  • Method for improving dispersion stability of silicon carbide powder in water system
  • Method for improving dispersion stability of silicon carbide powder in water system
  • Method for improving dispersion stability of silicon carbide powder in water system

Examples

Experimental program
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Effect test

Embodiment 1

[0025] In the present embodiment, the preparation method of silicon carbide ceramic powder is as follows:

[0026] (1) Disperse silicon carbide powder in distilled water, the ratio of silicon carbide powder mass to distilled water mass is 1:1, then add sucrose ester surfactant solution, so that the mass of sucrose ester accounts for 25% of the mass of silicon carbide, at 750r / min under the condition of mixing and stirring for 5h to obtain silicon carbide slurry;

[0027] The sucrose ester in the surfactant solution is used as a dispersant, and ethanol and acetone are used as a solvent, which is prepared by dissolving the sucrose ester at a temperature of 60-80°C, and then adding ethanol and acetone;

[0028] Then, adjust the pH value of the silicon carbide slurry with ammonia water and hydrochloric acid to obtain six groups of slurries with pHs of 2, 4, 6, 8, 10, and 12 respectively, and continue to stir for 1 hour under the condition of 300r / min. Adjust the pH value of the ...

Embodiment 2

[0039] In the present embodiment, the preparation method of silicon carbide ceramic powder is as follows:

[0040] (1) Disperse silicon carbide powder in distilled water, the ratio of silicon carbide powder mass to distilled water mass is 1:1, then add sucrose ester surfactant solution, so that the mass of sucrose ester accounts for 5% and 10% of the mass of silicon carbide respectively , 15%, 20%, 25%, 30%, mixed and stirred for 5 hours under the condition of 750r / min to obtain six groups of silicon carbide slurries;

[0041] The sucrose ester in the surfactant solution is used as a dispersant, and ethanol and acetone are used as a solvent, which is prepared by dissolving the sucrose ester at a temperature of 60-80°C, and then adding ethanol and acetone;

[0042] Then, adjust the pH value of the silicon carbide slurry with ammonia water and hydrochloric acid to obtain a pH of 10, continue stirring for 1 hour under the condition of 300r / min, and adjust the pH value of the sili...

Embodiment 3

[0046] (1) It is basically the same as step (1) in Example 1, except that the mass of sucrose ester accounts for 5% of the mass of silicon carbide, and the pH value of the silicon carbide slurry is adjusted to 10 with ammonia water and hydrochloric acid;

[0047] (2) is the same as step (2) in Example 1.

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Abstract

The invention relates to a method for improving the dispersion stability of silicon carbide powder in a water system. The method includes: dispersing silicon carbide powder in a water system to prepare a slurry, adding a sucrose ester surfactant solution to make the mass of sucrose ester account for 5%-30% of the mass of silicon carbide, and mixing the substances evenly to obtain a mixed solution,and adjusting the pH value of the mixed solution to 8-12. In the sucrose ester surfactant solution, sucrose ester serves as the solvent, and ethanol serves as the solvent. The method has the characteristics of simple operation, non-toxic and harmless dispersant, energy-saving and environmental protection, and low cost. The prepared silicon carbide water system has good silicon carbide dispersibility and high stability, and can be used as a silicon carbide slurry to be prepared into silicon carbide ceramics by slip casting moulding and other processes so as to improve the dispersion stabilityof silicon carbide ceramics.

Description

technical field [0001] The invention relates to the technical field of silicon carbide ceramics, in particular to a method for improving the dispersion stability of silicon carbide powder in a water system. Background technique [0002] Silicon carbide (SiC) is not only a strong covalent bond carbide, but also an engineering ceramic material with excellent performance. Silicon carbide has a very high decomposition temperature, which can reach 2600°C. It not only has excellent strength, hardness, and wear resistance at room temperature, but also has the best oxidation resistance and creep resistance at high temperatures among known ceramic materials. . At present, silicon carbide has been widely used in aerospace, chemical industry, machinery, transportation, energy and metallurgy and other fields, and is considered to be the best candidate material for rocket engines, gas turbines, advanced heat engines, heat exchangers, high-temperature wear-resistant parts, etc. one. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/569C04B35/626C04B35/632
CPCC04B35/565C04B35/62625C04B35/6263C04B35/632C04B2235/5427C04B2235/5436
Inventor 张永刚文章苹王雪飞钱鑫李德宏宋书林王欣宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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