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B4C/SiC whisker/SiC multiphase ceramic matrix composite and preparation method thereof

A composite material and multiphase ceramic technology, applied in the field of ceramic matrix composite materials, can solve the problems of high sintering temperature, slow cooling, poor shock resistance, etc., and achieve the effects of low preparation temperature, low infiltration reaction temperature, and improved comprehensive performance.

Inactive Publication Date: 2011-10-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, hot pressing sintering has the following problems: first, the sintering temperature is high, even if sintering additives are used, the sintering temperature must be around 2000 ° C; 4 C has poor shock resistance, so the temperature should be lowered slowly during the cooling process; the third is B obtained by hot pressing and sintering 4 C products are brittle; Fourth, hot pressing sintering can only produce products with simple shapes
[0008] The above-mentioned methods all disclose the method for preparing silicon carbide whiskers from rice husks, but for the application of prepared silicon carbide whisker-containing products, there are still relatively few relevant publications

Method used

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  • B4C/SiC whisker/SiC multiphase ceramic matrix composite and preparation method thereof
  • B4C/SiC whisker/SiC multiphase ceramic matrix composite and preparation method thereof
  • B4C/SiC whisker/SiC multiphase ceramic matrix composite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053] An appropriate amount of rice husk is placed in a graphite crucible and subjected to coking treatment at 900° C. for 2 hours under vacuum conditions. The coking treatment product was ground, then placed in a graphite crucible, and kept at 1500°C for 3 hours under vacuum conditions for silicon carbide whisker treatment to obtain a product rich in SiC whiskers and particles. Take 20 g of this product, 70 g of boron carbide powder with an average particle size of 7 μm and 10 g of molybdenum powder with an average particle size of 3 μm, and mix them by mechanical ball milling in absolute ethanol, and then place the ball milled slurry in an oven for drying. Add an appropriate amount of polyvinyl alcohol (PVA) binder with a concentration of 5 wt.% to the dried mixed powder, stir it, dry it and grind it for use. Take an appropriate amount of the powder and put it into a stainless steel mold with a length and a width of 50 mm, and mold it under the condition of 32 MPa, and then...

Embodiment 2

[0055] Take 40 g of the rice husk silicon carbide whisker product described in Example 1, 50 g of boron carbide powder with an average particle size of 3 μm, and 10 g of molybdenum powder with an average particle size of 3 μm and place them in a ball mill jar. Perform ball mill mechanical mixing in the middle, and then dry the mixed slurry. Then add a PVA binder with a concentration of 5 wt.% to the dried powder, and then dry it after stirring. Take 20 g of the dried powder and put it into a stainless steel mold with a length and width of 50 mm, and mold it under the condition of 96 MPa. The molded green body was pre-sintered at 1400°C for 2 hours under vacuum conditions to obtain a preform. The infiltration reaction is performed on the preform in a graphite sintering furnace. Place an appropriate amount of silicon block on the preform, heat it at 1460°C for 40 minutes under vacuum, and then cool it with the furnace to obtain a B of the size of the preform. 4 C / SiC whisker / ...

Embodiment 3

[0057] Put an appropriate amount of rice husk under vacuum conditions and heat it at 900°C for 2 hours for coking treatment, then grind the coked product and heat it at 1550°C for 6 hours under Ar gas atmosphere to carry out silicon carbide whisker treatment to obtain whiskers rich in SiC and particulate products. 60 g of SiC whisker products, 30 g of boron carbide powder with an average particle size of 7 μm, and 10 g of molybdenum powder with an average particle size of 3 μm were mixed by mechanical ball milling in absolute ethanol, and then the ball milled slurry was dried. Then add a PVA binder with a concentration of 5wt.% to the mixed powder, stir and then dry. An appropriate amount of the mixed powder was put into a stainless steel mold with a length and width of 50 mm, and molded under the condition of 96 MPa to obtain a pre-compact, and then the pre-compact was cold isostatically pressed under the condition of 180 MPa. The cold isostatic pressed body is pre-sintered ...

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Abstract

The invention which belongs to the technical field of ceramic matrix composites concretely relates to a ceramic matrix composite containing multiple ceramic phases of SiC whiskers, SiC particles and B4C particles and a preparation method of a product thereof. The B4C / SiC whisker / SiC multiphase ceramic matrix composite is prepared through carrying out a Si or Si alloy infiltration reaction on a prefabricated member, and the prefabricated member is prepared through carrying out compression molding on raw materials containing at least one of SiC and carbon, SiC whiskers and B4C powder. The B4C / SiC whisker / SiC multiphase ceramic matrix composite containing the multiple ceramic phases of the SiC whiskers, the SiC particles and the B4C particles prepared in the invention allows integrated performances of the composites to be improved. In the invention, the spontaneous infiltration reaction method is employed, each advantage of the spontaneous infiltration reaction method is inherited, and the compact multiphase ceramic matrix composite and the product thereof are obtained by carrying out infiltration and reaction sintering on the porous prefabricated member which is composed of B4C and rice hull silicon carbide whiskerizing products containing abundant SiC with Si or the Si alloy.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, and specifically relates to a composite material with SiC whiskers, SiC particles and B 4 The invention discloses a ceramic matrix composite material composed of multiple ceramic phases of C particles and a preparation method thereof. Background technique [0002] Boron carbide (B 4 C) The hardness of ceramics is second only to diamond and cubic boron nitride, especially its nearly constant high-temperature hardness (>30GPa) is unmatched by other materials. in B 4 In C, carbon and boron are mainly combined by covalent bonds, which have the characteristics of high melting point, high hardness, high modulus, small bulk density, and wear resistance. B 4 C does not react with acids and bases and most inorganic compounds at room temperature, and only slowly corrodes in hydrofluoric acid-sulfuric acid, hydrofluoric acid-nitric acid mixtures, and is one of the most chem...

Claims

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Application Information

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IPC IPC(8): C04B35/81C04B35/563C04B35/565C04B35/528C04B35/622
Inventor 高明霞巫红燕潘颐潘洪革刘永锋朱丹
Owner ZHEJIANG UNIV
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