Hot isostatic pressure preparation method of high-density grained titanium alloy

A hot isostatic pressing, titanium alloy technology, applied in the field of titanium alloys and materials, can solve the problems of coarse microstructure and low density, and achieve the effect of small grain size, high specific strength and good application prospects.

Inactive Publication Date: 2015-06-10
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a hot isostatic pressing method for preparing high-density fine-grained titanium alloys in view of the problems of low density and relatively coarse microstructure of titanium alloys prepared by traditional powder metallurgy methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) According to the ratio of Ti-V-Cr alloy, weigh titanium powder and other powders, mix the weighed components with titanium grinding balls and absolute ethanol in a mass ratio of 1:4:1, and put them into stainless steel In the ball mill jar, the particle size of the titanium balls is 5mm. After the ball milling jar is sealed, it is put into a planetary ball mill for wet grinding. The rotating speed of the ball milling jar is 100 r / min, and the grinding time is 1 hour. After grinding, the titanium balls and the slurry are separated by a 100-mesh metal screen, and the slurry is precipitated and dried to obtain titanium alloy mixed powder.

[0036] 2) After filling the titanium alloy mixed powder obtained in step 1 into a soft mold, it is formed by cold isostatic pressing at a pressure of 100 MPa for 5 minutes to obtain a billet.

[0037] 3) Vacuum sintering the billet after cold isostatic pressing, the sintering temperature is 1000°C, heat preservation for 10min, and c...

Embodiment 2

[0041] 1) According to the ratio of Ti-V-Cr titanium alloy, weigh titanium powder and other powders, and mix the weighed components with titanium grinding balls and absolute ethanol in a mass ratio of 2:6:2, then put into a stainless steel ball mill jar, wherein the particle size of the titanium balls is 6 mm. After the ball milling jar is sealed, it is put into a planetary ball mill for wet grinding, the rotating speed of the ball milling jar is 180r / min, and the grinding time is 4 hours. After grinding, first use a 100-mesh wire screen to separate the titanium balls from the slurry, and the slurry is precipitated and dried to obtain titanium alloy mixed powder.

[0042] 2) After filling the titanium alloy mixed powder obtained in step 1 into a soft mold, it is formed by cold isostatic pressing at a pressure of 180 MPa for 20 minutes to obtain a billet.

[0043] 3) Vacuum sintering the billet after cold isostatic pressing, the sintering temperature is 1200°C, heat preservati...

Embodiment 3

[0047] 1) According to the ratio of Ti-V-Cr titanium alloy, weigh titanium powder and other powders, and mix the weighed components with titanium grinding balls and absolute ethanol in a mass ratio of 2:10:4, and put into a stainless steel ball mill jar, wherein the particle size of the titanium balls is 10mm. After the ball milling jar is sealed, it is placed on a planetary ball mill for wet grinding. The rotating speed of the ball milling jar is 320r / min, and the grinding time is 10 hours. After grinding, first use a 100-mesh wire screen to separate the titanium balls from the slurry, and the slurry is precipitated and dried to obtain titanium alloy mixed powder.

[0048] 2) After filling the titanium alloy mixed powder obtained in step 1 into a soft mold, it is formed by cold isostatic pressing at a pressure of 270 MPa for 60 minutes to obtain a billet.

[0049] 3) Vacuum sintering the blank after cold isostatic pressing, the sintering temperature is 1350°C, the holding ti...

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Abstract

The invention discloses a hot isostatic pressure preparation method of a high-density grained titanium alloy, so as to solve the problems that the titanium alloy prepared by the conventional powder metallurgic method at present is lower in density and coarser in microscopic structure. The method comprises steps of titanium alloy mixed powder preparation, cold isostatic pressure molding, dense body sintering, hot isostatic pressure densifying, demolding, and the like. The density of the prepared titanium alloy can be up to 100%; and the prepared titanium alloy is characterized by a fine grain size, an excellent mechanical property, and a high specific strength. The prepared titanium alloy is able to meet the requirements to a high-density and high-performance titanium alloy in the fields of aviation and aerospace. The hot isostatic pressure preparation method of the high-density grained titanium alloy is reasonable in design; the hot isostatic pressure preparation method of the high-density grained titanium alloy is able to solve the problems mentioned above; and the hot isostatic pressure preparation method of the high-density grained titanium alloy is of a great significance in preparing titanium alloys.

Description

technical field [0001] The invention relates to the field of materials, especially the field of titanium alloys, in particular to a method for preparing high-density fine-grained titanium alloys by hot isostatic pressing. Background technique [0002] Titanium alloys are generally characterized by high strength, high weight ratio, corrosion resistance, and resistance to creep at moderately high temperatures. Due to these advantages, titanium alloys are often used in aerospace applications, including landing gear members, key structural components of engine frames, compressor blades, hydraulic system components and jet engines in nacelles. [0003] At present, the manufacturing methods of titanium alloy parts for aviation mainly include casting, smelting forging and powder metallurgy. Compared with powder metallurgy titanium alloy preparation technology, the production of titanium alloy by casting and smelting forging has the problems of long cycle, high energy consumption a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00
Inventor 王伟李强晏朝晖张国锋胡勇何林杨勇龙亮
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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