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Composite sintering aids for BN-ZrO2-SiC composite material

A technology of sintering aids and composite materials, which is applied in the field of composite sintering aids, which can solve the problems of general and unspecific additive composition, confusion, and large range of additives, and achieve superior thermal shock resistance, excellent comprehensive performance, and porosity low rate effect

Inactive Publication Date: 2015-03-25
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

The above-mentioned additives are sintering aids, but the composition of such additives is very general and not specific, and the range of additions is very large, which makes people feel confused

Method used

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  • Composite sintering aids for BN-ZrO2-SiC composite material

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with specific examples.

[0027] The main raw material of the embodiment of the present invention adopts hexagonal BN, ZrO 2 , SiC. BN makes the material have excellent thermal shock resistance, ZrO 2 Improve the corrosion resistance of the material, and SiC improves the wear resistance of the material. Al is used as sintering aid 2 o 3 Micropowder (purity 99.5%, particle size 2μm), CaCO 3 Fine powder (purity 99%, particle size 500 mesh) and SiO 2 Micropowder (purity 96%, particle size 0.8μm) composite additives. The proportion of each raw material (weight percentage), BN content 30-70%, ZrO 2 Content 20-60%, SiC content 5-30%, sintering aid content 2-10%. After the raw materials are weighed according to the proportion, they are mixed by ball milling. The grinding balls are made of corundum balls, and the ratio of grinding balls to raw materials is 2:1. The mixing time of ball milling is not...

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Abstract

The invention relates to BN composite material preparation technologies and discloses composite sintering aids for a BN-ZrO2-SiC composite material. The composite sintering aids contain 1-4% of Al2O3 micropowder, 1-3% of CaCO3 fine powder and 1-3% of SiO2 micropowder; the composite sintering aids are applied to a BN composite material, wherein the content of BN in the composite material is 30-70%, the content of ZrO2 in the composite material is 20-60%, the content of SiC in the composite material is 5-30%, and the content of the sintering aids in the composite material is 2-10%. The three sintering aids form an Al2O3-CaCO3-SiO2 low-melting-point phase at high temperatures. According to the composite sintering aids disclosed by the invention, hot-pressed sintering is carried out by adopting the Al2O3 micropowder, the CaCO3 fine powder and the SiO2 micropowder, so as to produce the BN composite material, and then, a good sintering aiding effect can be achieved, so that the material is low in porosity, high in strength and excellent in comprehensive properties.

Description

technical field [0001] The present invention relates to a kind of manufacturing technology of BN composite material, relate in particular to a kind of BN-ZrO 2 - Composite sintering aid for SiC composite materials. Background technique [0002] BN (boron nitride) has four crystal forms, among which hexagonal BN (h-BN) is a stable phase at normal pressure, so h-BN raw materials are generally used to produce BN ceramics. Hexagonal boron nitride (h-BN) has a low coefficient of thermal expansion, high thermal conductivity and excellent thermal shock resistance. Combining hexagonal boron nitride with other ceramic materials can improve its thermal shock resistance and improve the fracture strain of the material. BN composite materials have BN-ZrO 2 Composite material, BN-AlN composite material, BN-Sialon composite material, BN-ZrO 2 -SiC composite material, BN-AlN-Si 3 N 4 Composite materials, etc. The sintered boron nitride composite material has good machinability an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/63
Inventor 姚金甫叶长宏于艳吴建春方园王峰
Owner BAOSHAN IRON & STEEL CO LTD
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