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Method for preparing C/W2B5 composite material

A composite material, W2B5 technology, applied in the field of preparation of C/W2B5 composite materials, can solve the problem that it is difficult to obtain carbon/ceramic composite materials with excellent conductivity and high strength

Inactive Publication Date: 2005-01-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to obtain carbon / ceramic composites with excellent electrical conductivity and high strength

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific embodiment one: the operation steps of this embodiment are: a. B with a particle size of 0.1 μm to 20 μm 4 C powder, WC powder with a particle size of 0.1 μm to 20 μm, carbon black powder with a particle size of 15nm to 200nm as raw materials, B 4 C: WC: the mol ratio of carbon black is (4 ~ 6): (7 ~ 9): (0 ~ 120), according to conventional process mixing; b. the mixed material is packed in the graphite mould; c. then Place in a high-vacuum hot-press furnace, sinter in vacuum or protective gas, the sintering temperature is 1600°C-2200°C, the pressure applied to the graphite mold is 15MPa-45MPa, and the holding time is 0.5-3 hours.

specific Embodiment approach 2

[0005] Specific embodiment two: the operation steps of this embodiment are: a. B with a particle size of 0.1 μm to 7 μm 4 C powder, WC powder with a particle size of 0.1 μm to 7 μm, B 4 The molar ratio of C:WC is 4:7, mix according to the conventional process; b. put the mixed material into the graphite mold; c. then place it in a high-vacuum hot-press furnace, sinter in vacuum or protective gas, The sintering temperature is 1600°C-1800°C, the pressure applied to the graphite mold is 15MPa-25MPa, and the holding time is 0.5-1.2 hours.

specific Embodiment approach 3

[0006] Specific embodiment three: the operation steps of this embodiment are: a. B with a particle size of 7.1 μm to 14 μm 4 C powder, WC powder with a particle size of 7.1 μm to 14 μm, B 4 The molar ratio of C:WC is 5:8, and the materials are mixed according to the conventional process; b. put the mixed materials into graphite molds; c. then place them in a high-vacuum hot-press furnace and sinter in vacuum or protective gas, The sintering temperature is 1801°C-2000°C, the pressure applied to the graphite mold is 25.1MPa-35MPa, and the holding time is 1.3-2.1 hours. This mode is the preferred mode.

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Abstract

The processing steps are: a B4C powder with particle size 0.1 mum-20 mum, WC powder with particle size 0.1 mum-20 mum, conductex ratio of B4C:WC: conductex is (4-6):(7-9):(0-120), they are mixed by regular technology; b. mixed material is put in graphite model; c. the model is put into high vacuum heat-pressing furnace to be fired in vacuum or protection gas, firing temp. is 1600-2200 deg.C, pressure acting on graphite model is 15-45 Mpa, temp. -keeping time is 0.5-3 hours. The C / W2B5 compound material produced by this invention has compacting degree is greater than or equal to 96 percent, resistivity is less than or equal to 2.0 mu omega.m, room-temp. anti-bending strength is greater than or equal to 350 MPa, room-temp. breaking toughness is greater than or equal to 5 MPa.m1 / 2.

Description

Technical field: [0001] The present invention relates to a kind of preparation method of carbon / ceramic composite material, especially a kind of C / W 2 B 5 Methods of preparation of composite materials. Background technique: [0002] Carbon graphite material is a material with unique properties. It does not melt at high temperature, and its mechanical strength increases above 1000 ° C. It also has excellent thermal shock resistance, electrical conductivity, lubricity and corrosion resistance, which is convenient for machining. However, the low mechanical strength and poor air oxidation resistance limit its application. On the other hand, ceramic materials have high melting point, high mechanical strength and hardness, excellent corrosion resistance and oxidation resistance, but their thermal shock resistance, machinability and lubricity are poor, which is in sharp contrast to carbon graphite materials. Combining carbon materials and ceramic materials to make carbon / ceramic...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/563C04B35/622
Inventor 温广武吕毅宋亮
Owner HARBIN INST OF TECH
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