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Preparation method of net structure titanium-silicon alloy phase reinforced TiAl-based composite

A network structure, composite material technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of strength reduction and strength reduction, and achieve the effect of high compressive strength and excellent wear resistance.

Active Publication Date: 2019-02-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the existing design level, high content of reinforcing phase is the prerequisite for improving wear resistance, but it is mainly distributed in the form of particles and agglomerates in the matrix, which often leads to a decrease in strength
Yang Jun and others from the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences prepared high-content TiB by powder metallurgy. 2 and Ti 2 AlC-reinforced TiAl-based composites have improved wear resistance at room temperature but reduced strength (Tribology Letters 2014;53;457-467; Tribology International 2013;62;91-99)

Method used

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  • Preparation method of net structure titanium-silicon alloy phase reinforced TiAl-based composite
  • Preparation method of net structure titanium-silicon alloy phase reinforced TiAl-based composite
  • Preparation method of net structure titanium-silicon alloy phase reinforced TiAl-based composite

Examples

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Effect test

Embodiment 1

[0022] Example 1 A method for preparing a network-structured titanium-silicon alloy phase-reinforced TiAl-based composite material. In terms of mass fraction, 85% of pre-alloyed Ti-46Al-2Cr-2Nb powder and 15% of Ti 5 Si 3 The powder is mixed uniformly in a low-energy ball mill at a speed of 300r / min for 8 hours. Mix the TiAl-Ti evenly 5 Si 3 The powder material was put into a graphite mold, and placed in a vacuum hot-press sintering furnace, the sintering temperature was 1300°C, the pressure was 28MPa, and the heat preservation and pressure holding time was 30min. After vacuum hot pressing sintering and cooling at room temperature, the network structure Ti 5 Si 3 Reinforced TiAl-based composites.

[0023] Among them: pre-alloyed Ti-46Al-2Cr-2Nb powder refers to weighing Ti, Al, Cr, Nb element powders according to the atomic percentage of 50:46:2:2 and mixing them in a low-energy ball mill at a speed of 350 r / min 8h; after mixing evenly, put the mixed powder in a hot-pres...

Embodiment 2

[0024] Example 2 A method for preparing a network structure titanium-silicon alloy phase-reinforced TiAl-based composite material, by mass fraction, 70% of pre-alloyed Ti-46Al-2Cr-2Nb powder and 30% of Ti 5 Si 3 The powder is mixed evenly in a low-energy ball mill at a speed of 350r / min for 12h. Mix the TiAl-Ti evenly 5 Si 3 The powder material was put into a graphite mold and placed in a vacuum hot-press sintering furnace with a sintering temperature of 1350 °C, a pressure of 30 MPa, and a holding time of 60 min. After vacuum hot pressing sintering and cooling at room temperature, the network structure Ti 5 Si 3 Reinforced TiAl-based composites.

[0025] Among them: pre-alloyed Ti-46Al-2Cr-2Nb powder refers to weighing Ti, Al, Cr, Nb element powders according to the atomic percentage of 50:46:2:2 and mixing them in a low-energy ball mill at a speed of 350 r / min 8h; After mixing evenly, put the mixed powder in a hot-press furnace, and conduct pressureless heat treatment ...

Embodiment 3

[0026] Example 3 A method for preparing a network structure titanium-silicon alloy phase-reinforced TiAl-based composite material, by mass fraction, 65% of pre-alloyed Ti-46Al-2Cr-2Nb powder and 35% of Ti 5 Si 3 The powder is mixed evenly in a low-energy ball mill at a speed of 400r / min for 10h. Mix the TiAl-Ti evenly 5 Si 3 The powder material is put into a graphite mold, and placed in a vacuum hot-press sintering furnace, the sintering temperature is 1400°C, the pressure is 20MPa, and the heat preservation and pressure holding time is 2h. After vacuum hot pressing sintering and cooling at room temperature, the network structure Ti 5 Si 3 Reinforced TiAl-based composites.

[0027] Among them: pre-alloyed Ti-46Al-2Cr-2Nb powder refers to weighing Ti, Al, Cr, Nb element powders according to the atomic percentage of 50:46:2:2 and mixing them in a low-energy ball mill at a speed of 350 r / min 8h; After mixing evenly, put the mixed powder in a hot-press furnace, and carry out...

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Abstract

The invention relates to a preparation method of a net structure titanium-silicon alloy phase reinforced TiAl-based composite. The method comprises the step of making, by mass percentage, 65-85% of prealloyed Ti-46Al-2Cr-2Nb powder and 15%-35% of Ti5Si3 powder be sequentially subjected to mechanical uniform mixing, vacuum hot pressing sintering formation and cooling at the room temperature, so that the net structure Ti5Si3 reinforced TiAl-based composite can be obtained. The method is simple in preparation process, low in cost and stable in product performance; and the obtained net structure Ti5Si3 reinforced TiAl-based composite is high in compression strength and excellent in wear resistance and can be used as a novel structural wear-resistant material.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite material preparation, in particular to a network structure titanium-silicon alloy phase (Ti 5 Si 3 ) method for the preparation of reinforced TiAl-based composites. Background technique [0002] TiAl-based intermetallic compounds have the advantages of light weight, high specific strength, high specific rigidity, excellent high-temperature mechanics, oxidation resistance and creep resistance, and good flame retardancy. High temperature structural materials. In recent years, the room temperature plasticity and high temperature properties of TiAl intermetallic compounds have been greatly improved by alloying, heat treatment and thermomechanical treatment ( Rare Metal Materials and Engineering, 2011, 44(12): 2060-2064 ). However, a single TiAl intermetallic compound is difficult to meet the comprehensive requirements for high-temperature strength, creep resistance, durability, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C14/00C22C32/00C22C1/10B22F9/04B22F1/00
CPCC22C1/05C22C14/00C22C32/0078B22F9/04B22F2009/041B22F1/142
Inventor 程军杨军刘维民朱圣宇谈辉乔竹辉
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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