Method for adding Sn reinforcing sintering powder metallurgy TiAl base alloy

A powder metallurgy and enhanced sintering technology, applied in the field of powder metallurgy, can solve the problems of alloy high-temperature mechanical properties and high-temperature oxidation resistance, etc., and achieve the effects of shortening sintering time, saving energy and equipment consumption, and easy control of alloy components

Active Publication Date: 2017-09-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the addition of Cu and Ni will have an adverse effect on the high-temperature mechanical properties and high-temperature oxidation resistance of the alloy.

Method used

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  • Method for adding Sn reinforcing sintering powder metallurgy TiAl base alloy
  • Method for adding Sn reinforcing sintering powder metallurgy TiAl base alloy
  • Method for adding Sn reinforcing sintering powder metallurgy TiAl base alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] -400 mesh Ti-45Al-8.5Nb-0.5 (B, W, Y) (meaning Al45% by atomic percentage, Nb8.5%, the total content of B, W and Y is 0.5%, the balance is Ti , the same below) pre-alloyed powder as raw material, adding -500 mesh Sn powder as a sintering aid, after adding Sn, the content of Sn element in the mixed powder is 2.8wt.%. After the powders are uniformly mixed, they are put into a steel mold and pressed into a green body in one direction, and the relative density of the green body is 70%, and then the obtained green body is placed in a vacuum tube furnace for sintering. The sintering process is as follows: rapidly raise the temperature to 1100°C at 7°C / min, and hold the heat for 60 minutes; then slowly raise the temperature to 1500°C at 2°C / min, hold for 120 minutes, and then cool to room temperature with the furnace to obtain a TiAl-based alloy block body material.

[0037] Performance testing:

[0038] 1) Microstructure: The powder metallurgy sintered TiAl alloy and the po...

Embodiment 2

[0043] -400 mesh Ti-45Al-9Nb pre-alloyed powder is used as raw material, and -500 mesh Sn powder is added as a sintering aid. After adding Sn, the content of Sn element in the mixed powder is 8wt.%Sn. After the powders are evenly mixed, they are loaded into a steel mold and bi-directionally pressed to form a green body with a relative density of 75%, and then the obtained compact is placed in a vacuum tube furnace for sintering. The sintering process is as follows: the temperature is rapidly raised to 1300°C at 10°C / min, and the heat preservation time is 30 minutes; then the temperature is slowly raised to 1480°C at 2°C / min, and the temperature is maintained for 120 minutes, and then cooled to room temperature with the furnace to obtain a TiAl-based alloy block body material.

[0044] The relative density and mechanical properties were tested, and the results were as follows: the relative density of the alloy increased from 95.8% without addition to 98.5%; the compressive stre...

Embodiment 3

[0046] -200 mesh Ti-45Al-5Nb pre-alloyed powder is used as raw material, and -500 mesh Sn powder is added as a sintering aid, and the content of Sn element in the mixed powder after adding Sn is 0.8wt.%Sn. After the powders are uniformly mixed, put into a soft mold and cold isostatically press to form a green body with a relative density of 85%, and then place the obtained green body in a vacuum tube furnace for sintering. The sintering process is as follows: the temperature is rapidly raised to 1150°C at 10°C / min, and the heat preservation time is 30 minutes; then the temperature is slowly raised to 1480°C at 2°C / min, and the temperature is maintained for 120 minutes, and then cooled to room temperature with the furnace to obtain a TiAl-based alloy block body material.

[0047] The relative density and mechanical properties were tested, and the results were: the relative density of the alloy was increased from 96.8% without addition to 97.8%; the compressive strength, yield s...

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Abstract

The invention relates to a method for an adding Sn reinforcing sintering powder metallurgy TiAl base alloy. The method for the adding Sn reinforcing sintering powder metallurgy TiAl base alloy is characterized in that the method includes the following steps that S1, powder raw materials are prepared, TiAl pre-alloy powder and Sn powder are selected, and the proportion of the TiAl pre-alloy powder and the Sn powder is determined; S2, mixing, the powder raw materials prepared in the step S1 are placed in a blender mixer to mix uniformly; S3, blank preparing, the mixed powder in the step S2 are prepared into a blank material; and S4, sintering, the blank material in the step S3 are placed in a sintering furnace, pressureless sintering is conducted under the vacuum condition or the inert gas protection condition; heat preservation is finished, and cooling with the furnace, then the adding Sn reinforcing sintering powder metallurgy titanium-aluminium alloy is obtained. According to the method, the density of the adding Sn reinforcing sintering titanium-aluminium alloy material is high, the compositions are uniform, the tissues are finer, the mechanical property of the adding Sn reinforcing sintering titanium-aluminium alloy material is superior to a non-adding Sn reinforcing sintering titanium-aluminium alloy material, and the method for adding Sn reinforcing sintering powder metallurgy TiAl base alloy has no bad impact on the matrix high temperature mechanical property and the high temperature antioxidant property.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing a titanium-aluminum intermetallic compound. Background technique [0002] Titanium-aluminum (TiAl)-based intermetallic compounds have the characteristics of low specific gravity, good high-temperature strength, excellent oxidation resistance and creep resistance. Compared with other high-temperature alloys, they have more excellent high-temperature comprehensive properties and are considered to be the most promising. A new generation of lightweight high-temperature structural materials. However, the low ductility of TiAl-based alloys at room temperature and the difficulty of plastic forming hinder their industrial application. Compared with the traditional casting process, the powder metallurgy preparation process has unique advantages. It can not only obtain a uniform fine-grained structure, but also directly prepare parts with or close to the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/04C22C1/04
CPCC22C1/0416C22C1/0458C22C14/00C22C21/003C22C30/04C22C1/12C22C1/047
Inventor 路新刘程程潘宇佟健博曲选辉
Owner UNIV OF SCI & TECH BEIJING
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