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Al2O3/TiAl intermetallic compound composite material

A technology of intermetallic compounds and composite materials, which is applied in the field of Al2O3/TiAl intermetallic compound composite materials, can solve the problems of uniform distribution of dispersed phase matrix materials, lower material properties, etc., and achieve lower firing temperature and hot pressing pressure, comprehensive mechanics Improved performance and reduced production costs

Inactive Publication Date: 2012-11-14
陕西鑫汇新能源科技开发有限公司
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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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  • Al2O3/TiAl intermetallic compound composite material
  • Al2O3/TiAl intermetallic compound composite material

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, mix and grind for 60 minutes at a speed of 700 rpm, and pass through a 200-mesh sieve;

[0024] (3)...

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 5 Powder and Cr2 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 abrasive tool, and heat-press and...

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 mass of 80% of the mixture as a medium, mix and grind for 50 minutes at a speed of 700 rpm, and pass through a 200-mesh sieve;

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

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Abstract

The invention discloses a Al2O3 / TiAl intermetallic compound composite material. Ti powder, Al powder, Nb2O5 powder and Cr2O3 powder are subjected to a hot pressed sintering process, a particle reinforced phase and microalloyed elements are automatically generated through aluminothermic reduction reaction in the process of generating a matrix phase, and a Cr and Nb microalloyed Al2O3 / TiAl fine crystal composite material is prepared. The obtained material integrates advantages of composites materials; the matrix phase is subjected to bi-component microalloying, so that the comprehensive mechanical properties of the material are further improved; moreover, the firing temperature and hot pressing pressure are reduced, grain refining is realized in quick firing, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to an Al 2 o 3 / TiAl intermetallic compound composites. 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 application of the material. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C32/00C22C1/05
Inventor 朱建锋杨文文王芬周勇杨海波林营齐国权
Owner 陕西鑫汇新能源科技开发有限公司
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