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Preparation method of reticular Ti5Si3 and dispersed TiC enhanced TiAl-based composite

A composite material and network technology, which is applied in the field of preparation of TiAl-based composite materials, can solve the problems of complex process and insufficient oxidation resistance of high-density TiAl alloys, and achieve the effect of improving density and oxidation resistance

Inactive Publication Date: 2011-07-27
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention develops a network Ti 5 Si 3 The preparation method of TiAl-based composite materials reinforced with dispersed TiC is to solve the problem of insufficient oxidation resistance of TiAl alloys above 800 °C and the complex process of preparing high-density TiAl alloys, and provides a networked Ti 5 Si 3 Preparation method of TiAl-based composite material reinforced with dispersed TiC

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  • Preparation method of reticular Ti5Si3 and dispersed TiC enhanced TiAl-based composite

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specific Embodiment approach 1

[0008] Specific implementation mode 1: In this implementation mode, the reticulated Ti 5 Si 3 The preparation method of the TiAl-based composite material reinforced with dispersed TiC is carried out as follows: 1. Mechanically mix the spherical pure titanium particles with a particle size of 60-120 μm and the SiC particles with a particle size of 1-10 μm, and the mixing time is 10-20 hours , the mass ratio of ball to material is 3:1~10:1, and the mixed powder of Ti and SiC evenly mixed is obtained, wherein the pure titanium particles account for 67.5-68.2% of the total mass of the finished alloy, and the SiC particles account for 3.1-6.4% of the total mass of the finished alloy. %; 2. Put the mixed powder prepared in step 1 into a graphite mold to form a loose porous prefabricated body, then put a block of pure aluminum accounting for 25.4 to 29.4% of the total mass of the finished alloy on the prefabricated body, and then pack it together In the vacuum hot-pressing sintering...

specific Embodiment approach 2

[0009] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, the powder mixing time is 12 to 18 hours, and the ball mass ratio is 5:1 to 8:1, and the others are the same as specific embodiment one.

specific Embodiment approach 3

[0010] Embodiment 3: This embodiment differs from Embodiment 1 in that: in step 1, the powder mixing time is 15 hours, the mass ratio of balls to material is 6:1, and the others are the same as Embodiment 1.

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Abstract

A preparation method of a reticular Ti5Si3 and dispersed TiC enhanced TiAl-based composite relates to the preparation method of the TiAl-based composite. The invention aims to solve the problems that the oxidation resistance of the TiAl alloy is poor above 800 DEG C and the preparation process of the high density TiAl alloy is complicated. The method comprises the following steps: 1) preparing the mixed powder of Ti and SiC; 2) performing pressure infiltration in a vacuum hot press sintering furnace; and 3) preparing the reticular Ti5Si3 and dispersed TiC enhanced TiAl-based composite. The method adopts the reaction pressure infiltration technology to obtain the high density material and increase the oxidation resistance of the TiAl alloy, thus the high-temperature application requirement under 900 DEG C can be met, the density of the material can be effectively increased and the method is especially suitable for the preparation field of the TiAl alloy.

Description

technical field [0001] The invention relates to a preparation method of a TiAl-based composite material. Background technique [0002] TiAl alloy is an ideal new high-temperature structural material for aviation and aerospace vehicles. However, defects such as difficulty in deformation processing and insufficient oxidation resistance above 800 °C seriously hinder the practical application of this type of material. Usually, Ti 5 Si 3 1. Most of the preparation methods of TiC reinforced TiAl-based composite materials are based on two processes of mechanical alloying and casting metallurgy, which not only have many material defects, but also require a lot of follow-up processing. Furthermore, the resulting Ti 5 Si 3 Most of the reinforcements are evenly distributed in the TiAl-based material, and the oxidation resistance is insufficient. As a lightweight, high-strength, heat-resistant and high-temperature structural material used at 800-1000 ° C, there is still a certain ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10
Inventor 李爱滨李峰范国华耿林逄锦程黄陆军
Owner HARBIN INST OF TECH
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