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A kind of al2o3/tial intermetallic compound composite material and preparation method thereof

An intermetallic compound and composite material technology, which is applied in the field of Al2O3/TiAl intermetallic compound composite material and its preparation, can solve the problems of reducing material properties, uniform distribution of disperse phase in matrix materials, etc. Temperature and hot pressing pressure, the effect of reducing production cost

Inactive Publication Date: 2011-12-21
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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  • A kind of al2o3/tial intermetallic compound composite material and preparation method thereof
  • A kind of al2o3/tial intermetallic compound composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The Al to be prepared in this embodiment 2 o 3 / TiAl compound composite material, it is characterized in that, raw material composition weight percentage is that Ti powder accounts for 51.07% of total weight, Al powder accounts for 30.57%, Cr 2 o 3 Powder accounted for 2.94% and Nb 2 o 5 Powder accounted for 15.42%.

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

[0022] (1) The purity is greater than 99%, and the fineness is less than 200 mesh metal Ti powder, Al powder, Nb 2 o 5 Powder and Cr 2 o 3 Powder, Ti powder accounts for 51.07% of the total weight, Al powder accounts for 30.57%, Cr 2 o 3 Powder accounted for 2.94% and Nb 2 o 5 Powder accounts for 15.42% to make a mixture;

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

[0024] (...

Embodiment 2

[0030] The Al to be prepared in this embodiment 2 o 3 / TiAl compound composite material, it is characterized in that, raw material composition weight percent is that Ti powder accounts for 75.29% of total weight, Al powder 22.85%, Cr 2 o 3 Powder 0.3% and Nb 2 o 5 Powder 1.56%.

[0031] The preparation process steps of the present invention are:

[0032] (1) The purity is greater than 99%, and the fineness is less than 200 mesh metal Ti powder, Al powder, Nb 2 o 5Powder and Cr 2 o 3 Powder, Ti powder accounts for 75.29% of the total weight, Al powder 22.85%, Cr 2 o 3 Powder 0.3% and Nb 2 o 5 The proportion of powder 1.56% is made into mixture;

[0033] (2) Add the mixture obtained 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;

[0034] (3) Put the powder obtained by sieving in step (2) into a graphite grinding tool, and heat press an...

Embodiment 3

[0038] The Al to be prepared in this embodiment 2 o 3 / TiAl compound composite material, it is characterized in that, raw material composition weight percent is that Ti powder accounts for 65.37%, Al powder accounts for 26.01%, Cr 2 o 3 Powder accounted for 1.38% and Nb 2 o 5 Powder accounted for 7.24%.

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

[0040] (1) The purity is greater than 99%, and the fineness is less than 200 mesh metal Ti powder, Al powder, Nb 2 o 5 Powder and Cr 2 o 3 Powder, Ti powder accounts for 65.37% of the total weight, Al powder accounts for 26.01%, Cr 2 o 3 Powder accounted for 1.38% and Nb 2 o 5 Powder accounts for 7.24% to make a mixture;

[0041] (2) Add the mixture obtained in step (1) into a high-alumina ball mill tank, and add anhydrous ethanol with a mixture mass of 80% as a medium to mix and grind at a speed of 700 rpm for 50 minutes, and pass through a 200-mesh sieve;

[0042] (3) Put the powder obtained...

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Abstract

An Al2O3 / TiAl intermetallic compound composite material and a preparation method thereof, using Ti powder, Al powder, Nb2O5 powder and Cr2O3 powder through a hot-pressing sintering process, through the aluminothermic reduction reaction in the process of forming a matrix phase to generate a self-generated particle reinforcement phase and Micro-alloying elements, prepared Cr, Nb micro-alloyed Al2O3 / TiAl fine-grained composite materials, the material obtained in the present invention combines the advantages of composite materials, and also carries out two-component micro-alloying of the matrix phase, so that the material The comprehensive mechanical properties have been further improved. In addition, this method reduces the firing temperature and hot pressing pressure, and realizes fine graining during rapid firing, while reducing production costs.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to an Al 2 o 3 / TiAl intermetallic compound composite material and preparation method thereof. Background technique [0002] TiAl intermetallic compound is considered to be a new generation of high-temperature structural materials with the most application potential due to its superior properties such as low density, high elastic modulus, and high-temperature specific strength. It is expected to replace some of the existing metal and ceramic materials under high temperature conditions to improve product performance and achieve lightweight, so it has become one of the hot spots in the development of high temperature structural materials. However, the main problem facing TiAl-based alloys is how to improve their comprehensive mechanical properties and high-temperature oxidation resistance by controlling the chemical composition and microstructure to improve the practical applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C14/00C22C30/00
Inventor 朱建锋王芬周勇杨海波林营杨文文齐国权
Owner SHAANXI UNIV OF SCI & TECH
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