Method for preparing single-phase compact titanium aluminium carbon block body material by using si as adjurant through hot pressing process

A bulk material, titanium aluminum carbon technology, applied in the field of preparation of new ceramic titanium aluminum carbon materials, can solve the problems of difficult preparation, limited research and application, etc., and achieve the effect of simple raw materials

Inactive Publication Date: 2003-12-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Ti 3 AlC 2 The difficulty of preparation

Method used

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  • Method for preparing single-phase compact titanium aluminium carbon block body material by using si as adjurant through hot pressing process
  • Method for preparing single-phase compact titanium aluminium carbon block body material by using si as adjurant through hot pressing process

Examples

Experimental program
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Effect test

Embodiment 1

[0011] 150 grams of mixed powder with a molar ratio of TiC:Ti:Al:Si=2:1:0.95:0.25 was put into a graphite mold and sintered in a hot-press furnace with an Ar gas protective atmosphere. The heating rate is 50°C / min, the sintering temperature is 1300°C, the pressure is 30MPa, and the temperature is kept for 2 hours. The density of the bulk material is 99%, Ti 3 AlC 2 The content is 98.2wt%. Measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥750MPa, and the three-point bending strength σ b ≥350MPa, K IC ≥5MPa·m 1 / 2 .

Embodiment 2

[0013] Put 250 grams of mixed powder with a molar ratio of TiC:Ti:Si:Al=2:1:1.05:0.15 into a graphite mold and sinter in a hot-press furnace with a protective atmosphere of A and r. The heating rate is 50°C / min, the sintering temperature is 1400°C, the pressure is 60MPa, and the temperature is kept for 6 hours. The density of the bulk material is 99.8%, Ti 3 AlC 2 The content is 99.5wt%. Measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥750MPa, and the three-point bending strength σ b ≥370MPa, K IC ≥5MPa·m 1 / 2 .

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Abstract

The present invention uses TiC powder, Ti powder, Si powder and Al powder as raw material, the mole ratio of said four raw materials is as follows: TiC:Ti:Al:Si=2:1:0.95-1.05:0.15-0.25. They are uniformly mixed, then sintered in the heat-pressing furnace with Ar gas as protection atmosphere, its sintering temp. is 1200-1500 deg.C, heating-insulating time is 1-8 hr and pressure is 20-80 MPa. The Ti3AlC2 content in the prepared product is up to above 98 wt%, and the compactness of its block body material is up to 99%.

Description

technical field [0001] The present invention relates to novel ceramic titanium aluminum carbon (Ti 3 AlC 2 ) material preparation, in particular to a method for preparing titanium-aluminum-carbon bulk materials by in-situ hot-pressing solid-liquid phase reaction using Si as a reaction aid. Background technique [0002] Ti 3 AlC 2 It is a new layered ternary compound discovered in the 1990s. It has many advantages of both metal and ceramics, such as excellent electrical conductivity, thermal conductivity, machinability, good damage resistance, high melting point, high modulus (Young's modulus 297GPa, shear modulus 124GPa), high Strength and low density (4.25g / cm 3 )Wait. This is a new type of structural and functional material that can be widely used in high-tech fields such as electronic information, new energy, and aerospace. But Ti 3 AlC 2 The difficulty of preparation has limited its research and application. Literature (1) J.Am.Ceram.Soc., 83, No.4, 2000. With ...

Claims

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Application Information

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IPC IPC(8): C04B35/515C04B35/56C04B35/645
Inventor 朱教群梅炳初徐学文刘俊
Owner WUHAN UNIV OF TECH
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