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TiAl intermetallic compound composite material and preparation method thereof

A technology of intermetallic compounds and composite materials, which is applied in the field of TiAl intermetallic compound composite materials and its preparation, can solve the problems of reducing material performance, uniform distribution of dispersed phase matrix materials, etc., and achieve reduction of firing temperature, hot pressing pressure and cost The effect of low and excellent mechanical properties

Inactive Publication Date: 2010-05-05
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation methods include direct metal oxidation, reactive infiltration, gas pressure infiltration and hot isostatic pressing, etc., but it is difficult for these technologies to make the dispersed phase uniformly distributed in the matrix material, thus greatly reducing the performance

Method used

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  • TiAl intermetallic compound composite material and preparation method thereof
  • TiAl intermetallic compound composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw material composition of present embodiment is: Ti powder accounts for 59.10% of total weight, and Al powder accounts for 36.46% of total weight, Cr 2 o 3 Powder accounts for 4.44% of the total weight.

[0021] The preparation process steps of the present embodiment are as follows:

[0022] (1) Metal Ti powder, Al powder and Cr powder with purity greater than 99% and fineness less than 200 mesh 2 o 3 Powder, be 59.10%, 36.46%, 4.44% by weight ratio and mix homogeneously;

[0023] (2) Add the mixture in step (1) to a high alumina ball mill tank and add 50% absolute ethanol as a medium to mix and grind at a speed of 700 rpm for 60 minutes, and pass through a 200-mesh sieve;

[0024] (3) Put the powder obtained in step (2) into a graphite abrasive tool, hot press sintering, under vacuum conditions, the sintering temperature is 1100°C, heat preservation for 2 hours, and the hot pressing pressure is 5Mpa;

[0025] (4) naturally cooling the material obtained in st...

Embodiment 2

[0030] The raw material composition of present embodiment is: Ti powder accounts for 48.07% of total weight, and Al powder accounts for 37.41% of total weight, Cr 2 o 3 Powder accounts for 14.52% of the total weight.

[0031] The preparation process steps of the present embodiment are as follows:

[0032] (1) Metal Ti powder, Al powder and Cr powder with purity greater than 99% and fineness less than 200 mesh 2 o 3 Powder, be 48.07%, 37.41%, 14.52% by weight ratio and mix homogeneously;

[0033] (2) Add the mixture in step (1) into a high alumina ball mill jar and add absolute ethanol with a mass of 75% of the mixture as a medium to mix and grind for 45 minutes at a speed of 750 rpm, and pass through a 200-mesh sieve;

[0034] (3) Put the powder obtained in step (2) into a graphite abrasive tool, hot press and sinter, under vacuum conditions, the firing temperature is 1200°C, the heat preservation is 1.5 hours, and the hot pressing pressure is 7.5Mpa;

[0035] (4) natural...

Embodiment 3

[0038] The composition of raw materials in this embodiment is: Ti powder accounts for 40.43% of the total weight, Al powder accounts for 38.06% of the total weight, Cr 2 o 3 Powder accounts for 21.51% of the total weight.

[0039] The preparation process steps of the present embodiment are as follows:

[0040] (1) Metal Ti powder, Al powder and Cr powder with purity greater than 99% and fineness less than 200 mesh 2 o 3 Powder, be 40.43%, 38.06%, 21.51% by weight ratio and mix homogeneously;

[0041] (2) Add the mixture in step (1) into a high-alumina ball mill tank and add 100% absolute ethanol as a medium to mix and grind at a speed of 800 rpm for 30 minutes, and pass through a 200-mesh sieve;

[0042] (3) Put the powder obtained in step (2) into a graphite abrasive tool, hot press sintering, under the condition of argon, the firing temperature is 1300°C, heat preservation for 1 hour, and the hot pressing pressure is 5Mpa;

[0043] (4) naturally cooling the material obtai...

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Abstract

The invention relates to a TiAl intermetallic compound composite material and a preparation method thereof. 21.45-63.14% of Ti powder, 36.12-39.69% of Al powder and 0.74-38.87% of Cr2O3 powder in percentage by weight are utilized for hot pressed sintering process, particles reinforcement phase is automatically generated in the generation process of a matrix phase through thermit reaction, fine composite material of TiAl that an Al2O3 dispersed phase toughens a matrix phase, and microalloying improvement is carried out on the matrix phase by the generated Cr in the reaction; as the composite material has highly adjustable components, low firing temperature, even and compact structure, lower cost and excellent mechanical property, the application range is widened; in addition, the method reduces the firing temperature and hot pressing pressure, and realizes micritization of crystalline grains in rapid firing.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a TiAl intermetallic compound composite material and a preparation method thereof. Background technique [0002] TiAl intermetallic compound has excellent high-temperature performance, combines the advantages of ceramic and metal materials, and has a small volume density. It can replace some existing metal and ceramic materials under high-temperature conditions to improve product performance and achieve lightweight. Therefore, it has become one of the hot spots in the development of high-temperature structural materials. However, TiAl itself has high brittleness at room temperature, is difficult to deform and process, and has insufficient oxidation resistance above 850 °C, which seriously hinders the practical application of this material. [0003] The introduction of Cr into TiAl alloy can significantly improve the hot workability, superplasticity and high temperature oxidati...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C30/00C22C1/05
Inventor 朱建锋杨海波林营王芬杨文文齐国权周勇
Owner SHAANXI UNIV OF SCI & TECH
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