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Compact Ti2AlC-TiB2 composite material and preparation method therefor

A ti2alc-tib2, composite material technology, applied in the field of new structural materials, can solve the problems of low AlC hardness and poor acid resistance, and achieve the effect of dense structure, no interface pollution, and excellent performance

Inactive Publication Date: 2008-09-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to overcome Ti 2 AlC has low hardness and poor acid resistance defects. It provides an in-situ technology combined with discharge plasma synthesis method to prepare dense Ti 2 AlC-TiB 2 Composite materials to better broaden the Ti 2 Practical application fields of AlC

Method used

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  • Compact Ti2AlC-TiB2 composite material and preparation method therefor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The molar ratio of the raw material powder is Ti:Al:B:C=4.75:2.15:1:2.15; it is mixed evenly, put into a graphite mold, and sintered in a hot-press sintering system under argon protection. The heating rate is 100°C / min, the sintering temperature is 1250°C, the pressure is 30MPa, and the temperature is kept for 5 minutes. The density of the bulk material is 99.5%, Ti 2 The AlC content is 90%. Measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥800MPa, and the three-point bending strength σ b ≥600MPa, K IC ≥7MPa·m 1 / 2 , Vickers microhardness> 8GPa.

Embodiment 2

[0018] The molar ratio of the raw material powder is Ti:Al:B:C=3.15:1.35:1:1.35; it is mixed uniformly, put into a graphite mold, and sintered in a vacuum system of spark plasma sintering. The heating rate is 200°C / min, the sintering temperature is 1250°C, the pressure is 50MPa, and the temperature is kept for 10 minutes. The density of the bulk material is 99.2%, Ti 2 The AlC content is 85%. Measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥800MPa, and the three-point bending strength σ b ≥600MPa, K IC ≥7MPa·m 1 / 2 , Vickers microhardness> 8GPa.

Embodiment 3

[0020] The molar ratio of the raw material powder is Ti:Al:B:C=2.45:1.05:1:1.05; it is mixed uniformly, put into a graphite mold, and sintered in a vacuum system of spark plasma sintering. The heating rate is 200°C / min, the sintering temperature is 1200°C, the pressure is 50MPa, and the temperature is kept for 13 minutes. The density of the bulk material is 99.2%, Ti 2 The AlC content is 80%. Measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥800MPa, and the three-point bending strength σ b ≥600MPa, K IC ≥7MPa·m 1 / 2 , Vickers microhardness> 8GPa.

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Abstract

The invention discloses a compact Ti2AlC-TiB2 composite material and the manufacturing method thereof. The material includes Ti powder, Al powder, TiC powder and B4C powder. The mol ratio of the four material is Ti:Al:B:C=(2.35-9.45):(0.95-4.45):1:(0.95-5.45). The preparing method of said material is: weighing material in proportion; mixing the weighed material powder uniformly; putting the material in the black lead die, and sintering in the discharging plasma sintering system in vacuum, then cooling naturally. The provided composite material is compacted and without interphase pollution. In the whole preparation, the selective materials is simple. The invention adequately makes use of the reaction in situ and discharging plasma sintering and can quickly synthesize the excellent Ti2AlC-TiB2 composite material.

Description

technical field [0001] The present invention relates to a new type of structural material, in particular to a method of preparing dense Ti by using an in-situ technique combined with a discharge plasma synthesis method. 2 AlC-TiB 2 composite material. Background technique [0002] In recent years, although the research on ceramic-metal composite materials at home and abroad is very active, ordinary ceramics (such as SiC, TiC, Al 2 o 3 etc.) into metals, often due to the large difference in structure, physical properties and chemical bond characteristics between the two, it is difficult to form an ideal phase interface, and it is easy to cause brittle failure. [0003] Ti 2 AlC is a new type of layered ternary compound discovered in the 1960s. 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 304GPa, shear modulus 124G...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/58C04B35/622C04B35/645
Inventor 周卫兵梅炳初朱教群
Owner WUHAN UNIV OF TECH
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