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Method for preparing Ti5Si3/TiAl composite material

A composite material and al-si technology, which is applied in the field of composite material preparation, can solve the problems of high cost, poor uniformity and low density of TiAl composite materials, and achieve the effects of low cost, easy promotion and easy operation.

Inactive Publication Date: 2010-08-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of poor uniformity, low density and high cost of the TiAl composite material prepared by the prior art, the present invention provides a Ti 5 Si 3 / TiAl composite material preparation method

Method used

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  • Method for preparing Ti5Si3/TiAl composite material

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specific Embodiment approach 1

[0009] Specific implementation mode one: present implementation mode Ti 5 Si 3 The preparation method of the / TiAl composite material is realized according to the following steps: 1. The pure titanium particles with a diameter of 80-120 μm are directly deposited into the steel mold to form a porous titanium preform; 2. The Al-Si alloy ingot is wire-cut into A block with the same mold shape and size is placed on the porous titanium preform, and then placed in a vacuum hot-pressing sintering furnace, vacuumed to 0.001-0.01Pa, and then heated to 640-800 at a speed of 10-20°C / min. ℃ and keep warm for 30-60min, then pressurize to 5-30MPa, hold the pressure for 0.5-3h, continue to heat up to 1100-1400°C, sinter at a pressure of 10-30MPa for 1-4h, hold the pressure and cool to room temperature, then withdraw the mold , that is Ti 5 Si 3 / TiAl composite material; wherein the mass percentage of Al-Si alloy and pure titanium is 35-39:61-65, and the content of Si in the Al-Si alloy is...

specific Embodiment approach 2

[0013] Embodiment 2: This embodiment differs from Embodiment 1 in that step 1 uses pure titanium particles with a diameter of 90-110 μm. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0014] Embodiment 3: This embodiment differs from Embodiment 1 in that step 1 uses pure titanium particles with a diameter of 100 μm. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a method for preparing a Ti5Si3 / TiAl composite material, relates to a method for preparing a composite material and aims to solve the problems of poor uniformity, relatively lower compactness and high cost of a TiAl composite material prepared by using the prior art. The method comprises the following steps of: stacking pure titanium particles into a steel mold to obtain a porous titanium prefabricated body; and linearly cutting an Al-Si alloy ingot into blocks, placing the blocks on the porous titanium prefabricated body for hot pressing and sintering under a vacuum condition, cooling the porous titanium prefabricated body to room temperature and demolding the porous titanium prefabricated body to obtain the Ti5Si3 / TiAl composite material. The method has the advantages of effectively improving material compactness (95 to 98 percent) and structural uniformity, improving high-temperature strength, creep property and oxidation resistance, meeting requirements on practicability, saving the process of ball milling and powder mixing in a powder metallurgical process, reducing the probability of the oxidation of Ti and Al and the blending of new impurities, and reducing the negative influence of the oxidation and the impurities on Ti Al-base alloy plates, and also has the advantages of simple process, easy operation, less equipment and low cost.

Description

technical field [0001] The invention relates to a preparation method of a composite material. Background technique [0002] Due to its low density, high specific strength and specific stiffness, TiAl alloy is an ideal new high-temperature structural material for aviation and aerospace vehicles. However, from the perspective of its performance, especially mechanical properties, pure intermetallic compounds cannot meet the requirements of some special aerospace components. The comprehensive requirements of high temperature strength, creep resistance, oxidation resistance and durable performance, therefore, the preparation of intermetallic compound matrix composites is expected to obtain good mechanical properties while maintaining the characteristics of low matrix density. [0003] At present, TiB has been successfully prepared 2 , TiC, Ti 2 AlC, Al 2 o 3 and Ti 5 Si 3 Reinforced TiAl composite materials, the commonly used preparation methods are mostly based on the rout...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08
Inventor 李爱滨李峰崔喜平耿林张杰梁策
Owner HARBIN INST OF TECH
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