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Preparation method of oxide dispersion strengthened (ODS) titanium and titanium alloy

A technology of dispersion strengthening and titanium alloy, which is applied in the field of powder metallurgy titanium, can solve the problems of inability to obtain high-performance dispersion-strengthened titanium alloy materials, failure to remove oxygen elements in titanium alloys, and low melting point of calcium simple substance, etc., to achieve excellent oxygen removal effect, No component segregation, easy to obtain effect

Active Publication Date: 2020-04-07
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, due to the low melting point of calcium element, it is difficult to add into titanium alloy
Chinese patent application number: CN105063394A discloses "a preparation method of titanium or titanium alloy material", which involves adding CaH to titanium alloy 2 , but due to CaH 2 It has high activity, cannot exist stably at room temperature, and is easy to react with water vapor in the air to produce Ca(OH) 2 and other substances, which not only failed to remove the oxygen element in the titanium alloy, but also further introduced more oxygen, so it was impossible to obtain high-performance dispersion-strengthened titanium alloy materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of oxide dispersion strengthened (ODS) titanium and titanium alloy, according to the mass ratio, the content of calcium aluminum alloy powder is 5wt.%, and the content of pure titanium powder is 95wt.%. Concrete preparation steps are as follows:

[0023] (1) Mix 5 μm calcium aluminum alloy powder and 10 μm pure titanium powder in proportion, put them into a ball mill jar under the protection of argon atmosphere in a glove box, and mix them on a ball mill for 12 hours to obtain a uniformly mixed powder, in which calcium The calcium content in the aluminum alloy powder is 5wt.%.

[0024] (2) Put the mixed powder in step (1) into a silica gel cold isostatic bag, then perform cold isostatic pressing under a pressure of 200 MPa, hold the pressure for 60 seconds, and obtain a green body sample;

[0025] (3) Put the green body sample in step (2) into a vacuum sintering furnace for vacuum pressureless sintering, the sintering temperature is 1200°C, the hol...

Embodiment 2

[0027] A preparation method of oxide dispersion strengthened (ODS) titanium and titanium alloy, according to the mass ratio, the content of calcium aluminum alloy powder is 3wt.%, and the content of TA2 titanium alloy powder is 98%. Concrete preparation steps are as follows:

[0028] (1) Mix 10 μm calcium aluminum alloy powder and 30 μm TA2 titanium alloy powder in proportion, put them into a ball mill jar under the protection of argon atmosphere in a glove box, and mix them on a ball mill for 6 hours to obtain a uniformly mixed powder, in which calcium The calcium content of the aluminum alloy powder is 4wt.%.

[0029] (2) Put the mixed powder in the step (1) into a polyurethane cold isostatic bag, then perform cold isostatic pressing under a pressure of 400 MPa, hold the pressure for 50 seconds, and obtain a green body sample;

[0030] (3) Put the green body sample in step (2) into a vacuum sintering furnace for vacuum pressureless sintering, the sintering temperature is 13...

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Abstract

The invention discloses a preparation method of oxide dispersion strengthened (ODS) titanium and titanium alloy, and belongs to the field of powder metallurgy titanium. Calcium-aluminum alloy (CaAl) powder and titanium powder are mixed in proportion, then cold isostatic pressing forming and vacuum pressureless sintering are conducted, and oxide dispersion strengthened titanium and titanium alloy are obtained. The preparation method has the advantages that Ca and Al elements are introduced into the titanium alloy by adding CaAl alloy powder, Ca is uniformly distributed in a matrix, and dispersedly distributed fine Ca-Ti-O oxide second-phase particles are generated in situ in the sintering process, and meanwhile, the Al element is subjected to solid solution in the titanium matrix to form aTiAl solid solution, so that the mechanical property of the titanium alloy is greatly improved. The method is a new thought for improving oxygen control and performance regulation and control of preparation of high-performance titanium and titanium alloy, the requirement for the oxygen content of titanium and titanium alloy powder raw materials is lowered, and the method has the advantages of being low in cost, simple in process, easy to operate, suitable for industrial production and the like.

Description

technical field [0001] The invention discloses a preparation method of oxide dispersion strengthened (ODS) titanium and titanium alloy, which belongs to the field of powder metallurgy titanium. Background technique [0002] The high cost of production and processing of titanium and titanium alloys is the main reason for limiting their wide application. Therefore, promoting the cost reduction of titanium is the general trend of the development of the titanium industry. Powder metallurgy is an effective method for preparing low-cost, high-performance titanium and titanium alloys in a short process. It does not prepare dense titanium alloy materials by melting, which solves the problem of smelting titanium as a refractory metal; at the same time, its near-net shape characteristics and microstructure advantages The raw materials and blank forging process required for manufacturing the final product are reduced, and the problems of low utilization rate of ingot metallurgical tita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C32/00C22C1/10C22C1/04
CPCC22C1/0458C22C1/1078C22C14/00C22C32/0031
Inventor 杨芳邵艳茹秦乾郭志猛汪豪杰陈存广路新孙海霞周洋
Owner UNIV OF SCI & TECH BEIJING
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