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Method for preparing powder metallurgy titanium alloy bar

A technology of powder metallurgy and titanium alloy, which is applied in the field of preparation of high-performance powder metallurgy titanium alloy rods, can solve problems such as difficulty in preparing large-size titanium alloy rods, failure to meet fastener requirements, performance impact, etc., and achieve fine structure , there is no composition segregation, and the effect of meeting the size and performance requirements

Active Publication Date: 2015-01-07
FUJIAN LONGXI BEARING (GROUP) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two methods are difficult to prepare titanium alloy rods for fasteners with large size and large aspect ratio.
Xiao Daihong and others proposed a silver-containing powder metallurgy titanium-molybdenum-aluminum-vanadium alloy and its preparation method (see CN201010125198.8 Chinese Patent Application Publication Document). The main purpose of adding silver is to improve the formability of the green body. After vacuum sintering, The density of the alloy is 85% to 95%, the density of the product is low, the performance is greatly affected, and it cannot meet the needs of fasteners
At present, there is no report on the preparation of low-cost and high-performance titanium alloy rods for fasteners by powder metallurgy.

Method used

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  • Method for preparing powder metallurgy titanium alloy bar
  • Method for preparing powder metallurgy titanium alloy bar
  • Method for preparing powder metallurgy titanium alloy bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] a kind of like figure 1 Shown the preparation method of powder metallurgy titanium alloy bar material for fastener of the present invention, comprises the following steps:

[0039] (1) With particle size being -325 mesh Ti powder (oxygen content is 0.35%) and particle size being -250 mesh Al-V master alloy powder (oxygen content is 0.47%) as raw material, except a small amount of unavoidable impurity oxygen element, raw material It does not contain other elements except Ti powder and Al-V master alloy powder; weigh Ti powder and Al-V master alloy powder according to the mass ratio of 9:1, and the Al and V in Al-V master alloy powder The mass ratio is controlled at 6:4, and the weighed raw material powder is mixed evenly with a V-shaped mixer, and the mixing time is 8 hours. The mixing process is protected by an inert gas argon;

[0040] (2) Put the powder 1 fully mixed in step (1) into the cold isostatic pressing sleeve 2, which is a Ф40×250mm rubber circular sleeve (...

Embodiment 2

[0046] a kind of like figure 1 Shown the preparation method of powder metallurgy titanium alloy bar material for fastener of the present invention, comprises the following steps:

[0047] (1) With particle size being -325 mesh Ti powder (oxygen content is 0.35%) and particle size being -250 mesh Al-V master alloy powder (oxygen content is 0.47%) as raw material, except a small amount of unavoidable impurity oxygen element, raw material It does not contain other elements except Ti powder and Al-V master alloy powder; weigh Ti powder and Al-V master alloy powder according to the mass ratio of 9:1, and the Al and V in Al-V master alloy powder The mass ratio is controlled at 6:4, and the weighed raw material powder is mixed evenly with a V-shaped mixer, and the mixing time is 8 hours. The mixing process is protected by an inert gas argon;

[0048] (2) Put the powder 1 fully mixed in step (1) into the cold isostatic pressing sleeve 2, the cold isostatic pressing sleeve 2 is a Ф50...

Embodiment 3

[0054] a kind of like figure 1 Shown the preparation method of powder metallurgy titanium alloy bar material for fastener of the present invention, comprises the following steps:

[0055] (1) With a particle size of -200 mesh Ti powder (oxygen content is 0.20%), a particle size of -250 mesh Mo powder (oxygen content is 0.22%) and a particle size of -250 mesh Al-V master alloy powder (oxygen content is 0.47%) %) as the raw material, except for a small amount of unavoidable impurity oxygen element, the raw material does not contain other elemental components except Ti powder, Mo powder, Al-V master alloy powder; Ti powder, Mo powder and Al-V master alloy powder According to the mass ratio of 35:2:3, the mass ratio of Al and V in the Al-V master alloy powder is controlled at 6:4, and the weighed raw material powder is mixed evenly with a V-shaped mixer, and the mixing time is 8h , the mixing process is protected by inert gas argon;

[0056] (2) Put the powder 1 fully mixed in ...

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Abstract

The invention discloses a method for preparing a powder metallurgy titanium alloy bar. The method comprises the following steps: by taking Ti powder and alloy element powder as raw materials, sufficiently and uniformly mixing the Ti powder and the alloy element powder, and putting the mixed powder into an isostatic cool pressing sleeve for isostatic cool pressing treatment, thereby preparing a crude bar blank; performing vacuum sintering on the prepared crude bar blank, and performing furnace cooling, thereby preparing a sintered bar blank; and performing low-temperature thermoplastic deformation treatment on the prepared sintered bar blank, thereby obtaining the powder metallurgy titanium alloy bar with a large height-diameter ratio, wherein the alloy element powder comprises one or more of Al, V, Mo, Fe, Mn, Zr and intermediate alloy powder of the above elements, and the mass ratio of the alloy element powder is controlled to be within 15%. The method disclosed by the invention is low in cost, small in investment and good in product property, and the powder metallurgy titanium alloy bar can be used for manufacturing high-performance fasteners.

Description

technical field [0001] The invention belongs to the field of powder metallurgy materials, in particular to a method for preparing high-performance powder metallurgy titanium alloy rods. Background technique [0002] Titanium alloy has low density (4.51g / cm 3 , about 40% of steel), high strength (up to 1000MPa or more), good fatigue resistance (the fatigue limit is twice that of steel), excellent corrosion resistance, good biocompatibility, non-magnetic and other advantages, has been enjoying the " "Space Metal", "Ocean Metal" and other reputations, suitable for use as fastener materials. The weight reduction effect produced by the application of titanium alloy fasteners is of great significance for improving the propulsion of aircraft and spacecraft, increasing flight / range, saving fuel, and reducing launch costs. In modern aircraft manufacturing, the connecting fasteners used in an aircraft range from hundreds of thousands to as many as several million pieces. For example...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00
Inventor 刘彬曾凡沛卢金忠曹远奎刘咏熊翔
Owner FUJIAN LONGXI BEARING (GROUP) CO LTD
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