Preparation method of mullite whisker enhanced silicon carbide porous ceramic

A technology of mullite whiskers and porous ceramics, which is applied in the field of preparation of mullite whiskers reinforced silicon carbide porous ceramics, can solve the problems of limited application and poor bending strength, and achieve low cost, excellent high temperature resistance, superior Effect of Thermal Shock Stability and Mechanical Properties

Inactive Publication Date: 2019-11-15
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned patents have made good progress in porous silicon carbide ceramic materials and applications, although they have high porosity and air permeability, their bending strength is poor due to the traditional method of preparation.
Therefore, the current preparation technology of porous silicon carbide ceramic materials greatly limits the application of such materials

Method used

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  • Preparation method of mullite whisker enhanced silicon carbide porous ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The silicon carbide porous ceramic material reinforced by mullite whiskers provided in this example has the following raw materials: 66 kg of silicon carbide powder with a particle diameter of less than 0.045 mm, 8 kg of silicon powder with a particle diameter of less than 0.045 mm, and a particle diameter of less than 0.045 mm. 22kg of aluminum nitrate and 4kg of ammonium fluoride with particle size less than 0.045mm. Using starch as a binder and pore-forming agent, premixing, dissolving, kneading, molding, drying and firing are used to prepare mullite whisker-reinforced silicon carbide porous ceramic materials. The specific operation steps are as follows:

[0026] Step 1, pre-mixing, fully stirring silicon carbide powder and silicon powder in a mixer to obtain a mixed powder;

[0027] Step 2, dissolving, dissolving aluminum nitrate and ammonium fluoride in an appropriate amount of water in a magnetic stirrer, and stirring continuously for 10 minutes to fully react to ...

Embodiment 2

[0034] The silicon carbide porous ceramic material reinforced by mullite whiskers provided in this example has the following raw materials: 65 kg of silicon carbide powder with a particle diameter less than 0.045 mm, 10 kg of silicon powder with a particle diameter less than 0.045 mm, and a particle diameter less than 0.045 mm. 20kg of aluminum nitrate and 5kg of ammonium fluoride with particle size less than 0.045mm. Using starch as a binder and pore-forming agent, premixing, dissolving, kneading, molding, drying and firing are used to prepare mullite whisker-reinforced silicon carbide porous ceramic materials. The specific operation steps are as follows:

[0035] Step 1, pre-mixing, fully stirring silicon carbide powder and silicon powder in a mixer to obtain a mixed powder;

[0036] Step 2, dissolving, dissolving aluminum nitrate and ammonium fluoride in an appropriate amount of water in a magnetic stirrer, and stirring continuously for 10 minutes to fully react to obtain a...

Embodiment 3

[0043] The silicon carbide porous ceramic material reinforced by mullite whiskers provided in this example has the following raw materials: 60 kg of silicon carbide powder with a particle diameter of less than 0.045 mm, 13 kg of silicon powder with a particle diameter of less than 0.045 mm, and a particle diameter of less than 0.045 mm. 22kg of aluminum nitrate and 5kg of ammonium fluoride with particle size less than 0.045mm. Using starch as a binder and pore-forming agent, premixing, dissolving, kneading, molding, drying and firing are used to prepare mullite whisker-reinforced silicon carbide porous ceramic materials. The specific operation steps are as follows:

[0044] Step 1, pre-mixing, fully stirring silicon carbide powder and silicon powder in a mixer to obtain a mixed powder;

[0045] Step 2, dissolving, dissolving aluminum nitrate and ammonium fluoride in an appropriate amount of water in a magnetic stirrer, and stirring continuously for 10 minutes to fully react to...

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Abstract

The invention relates to a preparation method of a mullite whisker enhanced silicon carbide porous ceramic. Silicon carbide powder and silicon powder are taken as the raw materials, aluminum nitrate is taken as the aluminum source, ammonium fluoride is used as a catalyst, starch is taken as a bonding agent and a pore forming agent, and the raw materials are pre-mixed, dissolved, mixed, moulded, dried, and sintered to obtain the porous ceramic. The sintering is carried out at a low temperature, mullite whiskers are formed among silicon carbide particles, the breaking toughness of the porous ceramic is enhanced; the rupture strength of the porous ceramic is strengthened, and high strength silicon carbide porous ceramic is obtained.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a preparation method of mullite whisker reinforced silicon carbide porous ceramics. Background technique [0002] Porous silicon carbide ceramic materials have the advantages of low density, low thermal expansion coefficient, high temperature resistance, corrosion resistance, radiation resistance, high permeability, oxidation resistance, thermal shock resistance, etc., and are widely used as heat insulation materials, filter materials, chemical catalyst carriers, etc. . For example, in the field of metallurgy, it is used as molten metal filter, tapping trough, steel tapping hole, cold slide rail and still, etc.; in the field of silicate production, it is used as lining and sagger of various kilns, etc.; In the field of space science, it is used as a rocket nozzle and high-temperature gas turbine blades, etc.; in the field of nuclear energy, it is used as a fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/565C04B35/622C04B35/63C04B35/636C04B35/65C04B38/06
CPCC04B35/565C04B35/622C04B35/6303C04B35/636C04B35/65C04B38/0645C04B2235/428C04B2235/443C04B2235/526C04B2235/5264C04B2235/5276C04B2235/5436C04B2235/6567C04B2235/96C04B35/806
Inventor 罗旭东侯庆冬杨孟孟
Owner UNIV OF SCI & TECH LIAONING
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