SiC-BN-C composite material and preparation method thereof

A composite material, sic-bn-c technology, applied in the field of carbon/ceramic composite materials and its preparation, can solve the problems of high brittleness and limit the application of ceramics, achieve high-temperature oxidation resistance improvement, simple manufacturing process, and low production cost Effect

Inactive Publication Date: 2008-01-09
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High brittleness is the biggest disadvantage of ceramics, which greatly limits the application of ceramics and the exertion of other excellent properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: In this embodiment, mesocarbon microspheres containing about 11wt.% volatile matter are used as carbon source, a. take Si by weight percentage 3 N 4 Powder 57.8%, B 4 22.6% of C powder and 19.6% of volatile-containing mesophase carbon microsphere powder were wet-mixed by ball milling for 24 hours; b. Then, the mixed material was dried immediately; c. The dried material was crushed, and then put into a graphite mold And carry out pre-pressing; d. Then put it into a hot-pressing furnace, hot-press sintering in vacuum, the heating rate is 5-8°C / min, keep at 950-1050°C for 30min, and the hot-pressing sintering temperature is 1950°C-2050°C , Pressurize at 25-30MPa, keep warm and pressurize for 1h.

[0012] The density of the SiC-BN-C composite obtained after hot pressing and sintering is 92%, the flexural strength of the composite is 225MPa, and the fracture toughness is 3.2MPa m 1 / 2 , the Vickers hardness of the composite is 0.9GPa.

Embodiment 2

[0013] Embodiment 2: In this embodiment, mesocarbon microspheres containing about 10wt.% volatile matter are used as carbon source, a. take Si by weight percentage 3 N 4 Powder 42.0%, B 4 16.7% of C powder and 41.3% of volatile-containing mesophase carbon microsphere powder were wet-mixed by ball milling for 24 hours; b. Then, the mixed material was dried immediately; c. The dried material was crushed, and then put into a graphite mold And carry out pre-pressing; d. Then put it into a hot-pressing furnace, hot-press sintering in vacuum, the heating rate is 5-8°C / min, keep at 950-1050°C for 30min, and the hot-pressing sintering temperature is 1950°C-2050°C , Pressurize at 25-30MPa, keep warm and pressurize for 1h.

[0014] The density of the SiC-BN-C composite obtained after hot pressing and sintering is 60%, the flexural strength of the composite is 40MPa, and the fracture toughness is 0.9MPa m 1 / 2 , the Vickers hardness of the composite is 0.3GPa.

Embodiment 3

[0015] Embodiment 3: In this embodiment, mesocarbon microspheres containing about 5wt.% volatile matter are used as carbon source, a. take Si by weight percentage 3 N 4 Powder 29.7%, B 4 11.7% of C powder and 58.7% of mesophase carbon microsphere powder containing volatile matter were ball milled and wet mixed for 3 hours; b. Then the mixed material was dried immediately; c. The dried material was crushed, and then put into a graphite mold And carry out pre-pressing; d. Then put it into a hot-pressing furnace, hot-press sintering in vacuum, the heating rate is 5-8°C / min, keep at 950-1050°C for 30min, and the hot-pressing sintering temperature is 1950°C-2050°C , Pressurize at 25-30MPa, keep warm and pressurize for 1h.

[0016] The density of the SiC-BN-C composite obtained after hot pressing and sintering is 73%, the flexural strength of the composite is 44MPa, and the fracture toughness is 0.1MPa m 1 / 2 , the Vickers hardness of the composite is 0.4GPa.

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Abstract

A SiC-BN-C composite material and its production are disclosed. The materials contain Si3N4 6.4-63.8%, B4C 2.5-24.9% and C 11.9-91.1%. The process is carried out by taking various powders, ball grinding, wet mixing, drying, crushing, packing into graphite mould, pre-pressurizing, putting into hot-press furnace, hot pressing while sintering at 1700-2200 deg. C in vacuum or under protecting atmosphere, pressurizing at 15-30 MPa, keeping temperature and pressure for 30 min-2 hrs, or taking amorphous carbon containing volatile composition as carbon source, crushing for mixed dried materials, packing into steel mould, pressurizing at 50-300 MPa, keeping pressure for 10 min-2 hrs, putting into hot-press furnace or atmosphere sintering furnace, sintering in vacuum or under protecting atmosphere, raising temperature to 800-1400 deg. C and keeping temperature for 30 min-2 hrs. It's simple and costs low.

Description

technical field [0001] The invention relates to a carbon / ceramic composite material and a preparation method thereof, in particular to a SiC-BN-C composite material and a preparation method thereof. Background technique [0002] We know that carbon / graphite materials are widely used in many fields such as machinery, metallurgy, petrochemical industry, aerospace and other fields because of their inherent high temperature resistance, corrosion resistance, excellent electrical conductivity and low price. In particular, its self-lubricating properties and increased strength at high temperatures make it widely used as aerospace engine sealing materials. However, due to the low strength of the carbon / graphite material and its easy oxidation in the air above 400°C, it cannot meet the requirements of the increasingly rapid development of aerospace engines. Therefore, improving the strength and high-temperature oxidation resistance of carbon / graphite materials has become an urgent p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/596C04B35/563C04B35/52
Inventor 温广武李敏宋亮王鑫宇文磊郑佩琦
Owner HARBIN INST OF TECH AT WEIHAI
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