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In-situ growth beta-Si3N4 fiber/rod-like crystal enhanced glass-ceramic composite material and preparation method thereof

An in-situ growth and glass-ceramic technology, applied in the field of ceramic materials, can solve problems such as interface defects, thermal performance mismatch, and poor compatibility, and achieve low thermal expansion coefficient, good high-temperature mechanical properties, and high thermal conductivity. Effect

Pending Publication Date: 2015-04-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the Si prepared in the prior art 3 N 4 Ceramic composites have defects such as poor compatibility between fibers and the matrix, interface defects, and thermal performance mismatches. The purpose of the present invention is to provide an in-situ grown β-Si with excellent mechanical properties and thermal properties. 3 N 4 Fiber / Rod Crystal Reinforced Glass-Ceramic Matrix Composites

Method used

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  • In-situ growth beta-Si3N4 fiber/rod-like crystal enhanced glass-ceramic composite material and preparation method thereof
  • In-situ growth beta-Si3N4 fiber/rod-like crystal enhanced glass-ceramic composite material and preparation method thereof
  • In-situ growth beta-Si3N4 fiber/rod-like crystal enhanced glass-ceramic composite material and preparation method thereof

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Embodiment 1

[0031] Raw material components include base glass powder and α-Si 3 N 4 powder, its mass percentage is: glass powder content 40%, α-Si 3 N 4 The powder content is 60%, and the mass percentage of the oxide composition corresponding to each raw material in the basic glass is: La 2 o 3 50.8%, CaO 10.3%, Al 2 o 3 8.8%, SiO 2 Accounted for 30.1%.

Embodiment 2

[0033] Raw material components include base glass powder and α-Si 3 N 4 powder, its mass percentage is: glass powder content 40%, α-Si 3 N 4 The powder content is 60%, and the mass percentage of the oxide composition corresponding to each raw material in the basic glass is: La 2 o 3 57.2%, MgO 3.70%, Al 2 o 3 9.2%, SiO 2 Accounted for 29.9%.

Embodiment 3

[0035] Raw material components include base glass powder and α-Si 3 N 4 powder, its mass percentage is: glass powder content 40%, α-Si 3 N 4 The powder content is 60%, and the mass percentage of the oxide composition corresponding to each raw material in the basic glass is: La 2 o 3 Accounting for 52.2%, Li 2 O accounts for 7.9%, Al 2 o 3 9.0%, SiO 2 Accounted for 30.9%.

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Abstract

The invention discloses an in-situ growth beta-Si3N4 fiber / rod-like crystal enhanced glass-ceramic composite material and a preparation method thereof. The preparation method of the composite material comprises the steps that melt cooling and water quenching are carried out on La2O3, Y2O3, CaCO3, MgO, Li2CO3, Al2O3, SiO2 and other raw materials to prepare rare earth doped aluminosilicate glass powder, compression molding, drying and sintering are carried out on the glass powder and alpha-Si3N4 powder, and therefore the in-situ growth beta-Si3N4 fiber / rod-like crystal enhanced glass-ceramic composite material with the characteristics of being high in strength, low in coefficient of thermal expansion, high in heat conductivity and the like is obtained. The preparation technology is simple, low in sintering temperature, environmentally friendly and low in production cost. The obtained composite material has the wide application prospect, and can partially replace carbon / carbon, silicon carbide, carbon / silicon carbide, silicon nitride and other ceramic base high temperature structural materials to be used in the high-tech field of aerospace, aviation, national defense military industries, advanced manufacturing and the like.

Description

technical field [0001] The invention relates to an in-situ growth β-Si 3 N 4 A fiber / rod crystal reinforced glass-ceramic matrix composite material and a preparation method thereof belong to the technical field of ceramic materials. Background technique [0002] Ceramic-based high-temperature structural materials have become research hotspots because of their high melting point, high high-temperature strength, small high-temperature creep, good thermal shock resistance, high-temperature corrosion resistance, and high-temperature oxidation resistance. It is one of the key materials for national defense and high-tech industries. It is expected to become the preferred material for replacing metals and their alloys in the hot end structure of engines in the 21st century. However, the existing ceramic-based high-temperature structural materials have certain limitations. For example, the C / C composite material starts to oxidize at 370°C. After exceeding 500°C, its oxidation rate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02
Inventor 卢安贤罗志伟李秀英胡晓林刘涛涌刘飘张骞宋俊
Owner CENT SOUTH UNIV
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