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Porous composite sialon ceramic and preparation method for same

A technology of multiphase ceramics and Sialon, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problem of high production cost, and achieve the effect of reducing preparation cost, simple sintering process and high material strength.

Active Publication Date: 2014-05-21
WESTERN BAODE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Another object of the present invention is to provide a method for preparing the above-mentioned porous sialon composite ceramics, which solves the problem of high production cost of the existing high-strength porous sialon ceramics preparation method

Method used

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  • Porous composite sialon ceramic and preparation method for same

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preparation example Construction

[0031] The preparation method of the porous Sialon multiphase ceramic provided by the present invention is implemented according to the following steps:

[0032] a: First, weigh 20% to 45% of blue carbon powder, 10% to 30% of fly ash powder, 5% to 25% of alumina powder, and 2% to 8% of nitrided carbon powder according to the following mass percentages. Aluminum powder, 5%-25% silicon powder, 3%-12% binder and 5%-20% inorganic sol, and then use absolute ethanol as dispersant to mix blue carbon powder, fly ash powder, oxidized Aluminum powder, aluminum nitride powder and silicon powder are prepared into mixed powder by wet ball milling process, and then the mixed powder is dried, added to the binder completely dissolved in absolute ethanol, and stirred evenly to form granular raw materials;

[0033] b: put the granular raw material obtained in step a into the mold cavity, press molding, and dry and solidify the pressed green body at 80°C to 120°C;

[0034] c: placing the green ...

Embodiment 1

[0046] Weigh respectively blue carbon powder with an average particle size of 10 μm and a carbon content of 87%, fly ash powder with an average particle size of 10 μm and an alumina content of 25% and a silicon oxide content of 45%, and an oxide powder with an average particle size of 5 μm. Aluminum powder, aluminum nitride powder with an average particle size of 5 μm, silicon powder with an average particle size of 40 μm, phenolic resin and alumina sol with a concentration of 0.05 mol / L, in the total mass, blue carbon powder accounts for 20%, Fly ash powder accounts for 30%, alumina powder accounts for 5%, aluminum nitride powder accounts for 8%, silicon powder accounts for 25%, phenolic resin accounts for 3%, and alumina sol accounts for 9%. Then, the blue carbon powder, fly ash powder, alumina powder, aluminum nitride powder and silicon powder are prepared into mixed powder by wet ball milling process using absolute ethanol as a dispersant, and then the mixed powder is dried...

Embodiment 2

[0049] Weigh respectively blue carbon powder with an average particle size of 20 μm and a carbon content of 90%, fly ash powder with an average particle size of 60 μm and an alumina content of 26% and a silica content of 46%, and an oxide powder with an average particle size of 40 μm. Aluminum powder, aluminum nitride powder with an average particle size of 40 μm, silicon powder with an average particle size of 20 μm, PVB, and a mixture of alumina sol and silica sol (or silica sol and titania sol with a concentration of 0.7 mol / L) mixture, or mixture of alumina sol and titania sol), in its total mass, blue carbon powder accounts for 45%, fly ash powder accounts for 10%, alumina powder accounts for 21%, aluminum nitride powder accounts for 2%, silicon powder accounts for 2% 5%, PVB 12%, alumina sol and silica sol mixture 5%. Then, the blue carbon powder, fly ash powder, alumina powder, aluminum nitride powder and silicon powder are prepared into mixed powder by wet ball milling...

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Abstract

The invention discloses porous composite sialon ceramic. Based on the total amount of 100 percent, the porous composite sialon ceramic consists of the following components in percentage by mass: 20 to 45 percent of semi-coke, 10 to 30 percent of fly ash, 5 to 25 percent of alumina, 2 to 8 percent of aluminum nitride, 5 to 25 percent of silicon, 3 to 12 percent of adhesive and 5 to 20 percent of inorganic sol. The preparation method comprises the following steps of weighing semi-coke powder, fly ash powder, alumina powder, aluminum nitride powder, silicon powder, the adhesive and the inorganic sol respectively; performing wet milling to obtain mixed powder, and drying and adding the mixed powder into the adhesive to form a granular raw material; loading the granular raw material into a die cavity of a die, and performing die pressing to form a green body; performing carbothermal reduction-nitridation on the green body, and impregnating the green body to obtain a pre-sintered body by using the inorganic sol; performing post-treatment sintering on the pre-sintered body to obtain the porous composite sialon ceramic. The preparation method is low in cost, and a process is simple; the preparation cost is greatly lowered, and meanwhile, high material strength is ensured.

Description

technical field [0001] The invention belongs to the technical field of Sialon multiphase ceramics, in particular to a porous Sialon multiphase ceramics, and also relates to a preparation method of the ceramics. Background technique [0002] Porous sialon (SiAlON) multiphase ceramics have the characteristics of low thermal expansion coefficient, low density, high temperature resistance, corrosion resistance, oxidation resistance and thermal shock resistance, and are widely used as thermal insulation materials, filter materials, chemical catalyst carriers and thermal insulation materials. Sound insulation materials, etc. At present, the common preparation methods are as follows: [0003] (1) Carbothermal reduction nitridation (CRN) [0004] The principle of carbothermic reduction and nitridation is to use C as a reducing agent, in N 2 When heated to above 1400 ℃ in the atmosphere, the highly reducible C opens the Si-O bond and forms the C-O bond, and the Si and Al in the un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/599C04B35/622
Inventor 刘荣臻段庆文吴引江南海娟刘高建
Owner WESTERN BAODE TECH CO LTD
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