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Method of fnst preparing conductire ceramic conposife material at low femperature

A technology of conductive ceramics and composite materials, which is applied in the field of preparation of conductive ceramic composite materials, and can solve problems such as high sintering temperature, low production efficiency, and increased production costs

Inactive Publication Date: 2006-01-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: high sintering temperature and long sintering time, and high sintering temperature and long sintering time will inevitably increase production costs and low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First add 40g TiB 2 Powder (purity > 98%, particle size less than 5 μm), 60g BN (purity > 97%, particle size less than 1 μm) is fully mixed, after spray drying, placed in a high-strength graphite mold, in a high-current high-pressure rapid sintering furnace, Heating rate of 150 degrees per minute is heated to 1700 ° C for sintering, pressure: 50 MPa, and sintering time is 30 minutes. After sintering, cut off the current, and slowly cool down to room temperature with the furnace. TiB with a relative density greater than 96.2% can be obtained 2 -BN conductive ceramic composite material, bending strength 148MPa.

Embodiment 2

[0021] First add 50g TiB 2 Powder (purity>98%, particle size less than 5μm), 50g BN (purity>97%, particle size less than 1μm) is fully mixed, after spray drying, placed in a high-strength graphite mold, in a high-current high-pressure rapid sintering furnace, Heating rate of 180 degrees per minute is heated to 1600 ° C for sintering, pressure: 50 MPa, and sintering time is 30 minutes. After sintering, cut off the current, and slowly cool down to room temperature with the furnace. TiB with a relative density greater than 95.7% can be obtained 2 -BN conductive ceramic composite material, bending strength 134MPa.

Embodiment 3

[0023] First put the 58g TiB 2 Powder (purity > 98%, particle size less than 5 μm), 42g BN (purity > 97%, particle size less than 1 μm) is fully mixed, after spray drying, placed in a high-strength graphite mold, in a high-current high-pressure rapid sintering furnace, Heating rate of 180 degrees per minute is heated to 1650 ° C for sintering, pressure: 50 MPa, and sintering time is 30 minutes. After sintering, cut off the current, and slowly cool down to room temperature with the furnace. TiB with a relative density greater than 95.2% can be obtained 2 -BN conductive ceramic composite material, bending strength 123MPa.

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Abstract

The invention relates to a process for preparing conductive ceramic composite material which comprises, fully mixing TiB2 powder with BN powder by the weight percentage of 40-58: 42-60, after spray drying, loading into great-current high-voltage rapid sintering furnaces, the heating rate being 150-180 deg. C per minute, the sintering time being 10-30 minutes, the sintering temperature being 1600-1700 deg. C, the sintering pressure being 40-60 MPa, finally furnace cooling. The process can be used to obtain TiB2-BN conductive ceramic composite material with a density greater than 95%. The advantages of the invention include appreciable energy-saving effect and improved production efficiency.

Description

technical field [0001] The invention relates to a method for preparing conductive ceramic composite material. Background technique [0002] TiB 2 Ceramics are important new engineering materials with many important physical and chemical properties, such as high melting point, high modulus, corrosion resistance, high thermal conductivity, high electrical conductivity, etc., and have a wide range of application values. in TiB 2 Introducing BN to adjust its resistivity and thermal shock resistance can make a new type of conductive ceramic composite material, which can be widely used in surface metallization and surface modification of various materials. [0003] This kind of conductive ceramic composite material can be prepared by reaction sintering method. Zhang Guojun introduced this reaction sintering process [China Ceramics, 1994 (3)]. The composition and structure required to form a material. The main disadvantage of this process is that the composition of the synthesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/583C04B35/58C04B35/64
Inventor 王为民傅正义王皓张金咏王玉成张清杰
Owner WUHAN UNIV OF TECH