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Powder metallurgy titanium alloy and preparation method thereof

A powder metallurgy and titanium alloy technology is applied in the field of the preparation of the powder metallurgy titanium alloy, and can solve the problems such as the inability to meet the requirements of the anti-fatigue properties of the titanium alloy, the inability of the titanium alloy to meet the high-strength anti-fatigue resistance, and the density lower than 97%, and the like, Achieve high density and comprehensive performance, improve mechanical properties, and improve the effect of density

Inactive Publication Date: 2011-02-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional titanium alloy powder metallurgy technology has the main defect of low density
The titanium alloy cannot meet the special requirements of high strength and fatigue resistance
[0003] The inventor proposes to do vacuum sintering by doping silver to obtain silver-containing powder metallurgy titanium-molybdenum-aluminum-vanadium alloy [Chinese patent: 201010125198.8], but due to the vacuum sintering method, its density is lower than 97%
Unable to meet the requirements of new structural materials for fatigue resistance of titanium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation composition is Ti-5Al-4Mo-4V-2Ag-0.1LaB 6 powder metallurgy titanium alloy. The raw materials used are -100 mesh titanium powder, -500 mesh aluminum powder, -100 mesh molybdenum powder, -300 mesh Al-58V master alloy powder, -100 mesh silver powder, -250 mesh lanthanum hexaboride powder. The raw material powder is weighed according to the alloy ratio, and the raw material powder is mixed evenly by ball milling on a ball mill, and then molded into a green body under a pressure of 500MPa, and the green body is put into a vacuum hot-pressing sintering furnace for high-temperature sintering, and the vacuum degree is controlled at 1 ×10 -2 MPa, the sintering temperature is 1300°C, the sintering time is 3h, and the applied pressure is 25MPa. The compressive strength of the powder metallurgy titanium alloy obtained after cooling with the furnace is 1750MPa, and the compactness of the sintered body obtained by the drainage method is 99.1%.

Embodiment 2

[0025] The preparation composition is Ti-2Al-8Mo-2V-5Ag-2.5LaB 6 powder metallurgy titanium alloy. The raw materials used are -200 mesh titanium powder, -300 mesh aluminum powder, -200 mesh molybdenum powder, -150 mesh Al-58V master alloy powder, -200 mesh silver powder, -100 mesh lanthanum hexaboride powder. The raw material powder is weighed according to the alloy ratio, and the raw material powder is ball milled on a ball mill to mix evenly, and then molded into a green body under a pressure of 300MPa, and the green body is put into a vacuum hot-pressing sintering furnace for high-temperature sintering, and the vacuum degree is controlled at 1. ×10 -3 MPa, the sintering temperature is 1500°C, the sintering time is 3h, and the applied pressure is 25MPa. The compressive strength of the powder metallurgy titanium alloy obtained after cooling in the furnace is 2010MPa, and the compactness of the sintered body obtained by the drainage method is 99.7%.

Embodiment 3

[0027] The preparation composition is Ti-5Al-4Mo-4V-3Ag-1.0LaB 6 powder metallurgy titanium alloy. The raw materials used are -300 mesh titanium powder, -300 mesh aluminum powder, -300 mesh molybdenum powder, -150 mesh Al-58V master alloy powder, -200 mesh silver powder, -100 mesh lanthanum hexaboride powder. The raw material powder is weighed according to the alloy ratio, and the raw material powder is ball milled and mixed evenly on a ball mill, and then molded into a green body under a pressure of 400MPa, and the green body is put into a vacuum hot-pressing sintering furnace for high-temperature sintering, and the vacuum degree is controlled at 1. ×10 -1 MPa, the sintering temperature is 1250°C, the sintering time is 6h, and the applied pressure is 15MPa. The compressive strength of the powder metallurgy titanium alloy obtained after cooling with the furnace is 1862MPa, and the density of the sintered body obtained by the drainage method is 99.3%.

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Abstract

The invention provides powder metallurgy titanium alloy and a preparation method thereof. The powder metallurgy titanium alloy comprises the following components in percentage by mass: 2 to 7 percent of Al, 2 to 8 percent of Mo, 2 to 6 percent of V, 2 to 10 percent of Ag, 0.1 to 3.0 percent of LaB6 and the balance of titanium and inevitable impurities. The method comprises the following steps of: weighing titanium powder, aluminum powder, molybdenum powder, aluminum-vanadium intermediate alloy powder, silver powder and lanthanum hexaboride powder with certain particle size according to the mass percentage of the components; uniformly mixing the powder by a mixing method; preparing a green compact with a certain shape by a compression molding process; placing the green compact in a vacuum hot pressing sintering furnace to sinter; and cooling the green compact along with the furnace to obtain silver and titanium boride particle-containing powder metallurgy titanium alloy. The technological process is simple; the silver powder is added during the mixing of the materials to improve the molding property of the green compact; the lanthanum hexaboride powder is added to perform reaction in situ so as to generate titanium boride dispersion enhanced matrix alloy; the compactness of the sinter compact is further improved by hot pressing sintering; and thus the novel powder metallurgy titanium alloy with high compactness and high strength is obtained.

Description

technical field [0001] The invention relates to a powder metallurgy titanium alloy, in particular to a powder metallurgy titanium alloy containing silver and titanium boride particles, and also relates to a preparation method of the powder metallurgy titanium alloy. Background technique [0002] Due to the advantages of low density, high specific strength, high yield ratio, good plasticity and toughness, and good corrosion resistance, titanium alloys have broad application prospects in military and civilian fields, and their performance and manufacturing technology directly affect these fields. development and improvement of the level. There are currently three main methods for manufacturing titanium alloy parts: 1) traditional forging material processing; 2) casting; 3) powder metallurgy. Forging is used for material processing, and its material performance is excellent, but it is wasteful, the processing volume is large, the cost is high, and it is difficult to obtain pro...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C14/00
Inventor 肖代红袁铁锤欧小琴申婷婷宋旼
Owner CENT SOUTH UNIV
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