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Partial dehydriding, sintering and densification method of hydride of vanadium, chromium and titanium alloy

A vanadium-chromium-titanium alloy and titanium alloy technology, which is applied in the field of activation sintering and densification, and partial dehydrogenation of hydrides of vanadium-chromium-titanium alloys, which can solve the problem of low density, high hydrogen content, sintering cracking of vanadium-chromium-titanium alloys problems, to achieve the effects of low manufacturing cost, reduced hydrogen content, and improved density

Active Publication Date: 2014-06-11
SICHUAN INST OF MATERIALS & TECH
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of sintering cracking, high hydrogen content and low density of the vanadium-chromium-titanium alloy prepared by the existing powder metallurgy method, and provide a A method for partial dehydrogenation, sintering and densification of vanadium-chromium-titanium alloys. This method makes the hydrogen content in the alloy lower than 20ppm and the density higher than 96% by adopting low-temperature and high-vacuum partial dehydrogenation, activation sintering and high-temperature sintering densification.

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  • Partial dehydriding, sintering and densification method of hydride of vanadium, chromium and titanium alloy

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Embodiment 1

[0021] Present embodiment technological step is as follows:

[0022] a. The fine powder of vanadium, chromium and titanium with a particle size of 20μm--35μm, after partial dehydrogenation treatment at a low temperature of 300°C, is mixed in a low-humidity and low-oxygen glove box, and encapsulated by a soft film. The low-humidity and low-oxygen gloves The box is a high-purity argon atmosphere, and the oxygen content is less than 20ppm, and the water vapor concentration is less than 10ppm, and then after 200MPa / 8min cold isostatic pressing, a vanadium-chromium-titanium alloy cold compact is obtained;

[0023] b. Place the vanadium-chromium-titanium alloy cold compact in a high-vacuum tungsten wire sintering furnace for cold degassing, and gradually heat up after the vacuum degree is lower than 5E-2Pa, and set up a heat preservation platform at 400°C, 600°C and 900°C. It is used for partial dehydrogenation and activation sintering of vanadium hydride and titanium hydride at low...

Embodiment 2

[0026] Present embodiment technological step is as follows:

[0027] a. The fine powder of vanadium, chromium and titanium with a particle size of 20μm--35μm, after partial dehydrogenation treatment at 450°C, is mixed in a low-humidity and low-oxygen glove box, and encapsulated by a soft film. The low-humidity and low-oxygen gloves The box is a high-purity argon atmosphere, and the oxygen content is less than 20ppm, and the water vapor concentration is less than 10ppm, and then after 180MPa / 10min cold isostatic pressing, a vanadium-chromium-titanium alloy cold compact is obtained;

[0028] b. Place the vanadium-chromium-titanium alloy cold compact in a high-vacuum tungsten wire sintering furnace for cold degassing, and gradually heat up after the vacuum degree is lower than 5E-2Pa, and set up a heat preservation platform at 400°C, 600°C and 900°C. It is used for partial dehydrogenation and activation sintering of vanadium hydride and titanium hydride at low temperature;

[00...

Embodiment 3

[0031] Present embodiment technological step is as follows:

[0032] a. The fine powder of vanadium, chromium and titanium with a particle size of 20μm--35μm, after partial dehydrogenation treatment at a low temperature of 500°C, is mixed in a low-humidity and hypoxia glove box, and encapsulated by a soft film. The low-humidity and hypoxia gloves The box is a high-purity argon atmosphere, and the oxygen content is less than 20ppm, and the water vapor concentration is less than 10ppm, and then after 220MPa / 5min cold isostatic pressing, a vanadium-chromium-titanium alloy cold compact is obtained;

[0033] b. Place the vanadium-chromium-titanium alloy cold compact in a high-vacuum tungsten wire sintering furnace for cold degassing, and gradually heat up after the vacuum degree is lower than 5E-2Pa, and set up a heat preservation platform at 400°C, 600°C and 900°C. It is used for partial dehydrogenation and activation sintering of vanadium hydride and titanium hydride at low tempe...

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Abstract

The invention relates to a partial dehydriding, sintering and densification method of a hydride of vanadium, chromium and titanium alloy, and relates to a method for dehydriding, reducing the cracking trend and improving the densification and alloying of the vanadium, chromium and titanium alloy in a sintering process of cold-pressed compacts of the vanadium, chromium and titanium alloy in order to solve the problems that the vanadium, chromium and titanium alloy prepared by the traditional powder metallurgy method is easily cracked and has higher hydrogen content and low density. The method comprises the following steps of: a. preparation of cold-pressed compacts of the vanadium, chromium and titanium alloy; b. deep dehydrogenation of a hydride in the cold-pressed compacts of the vanadium, chromium and titanium alloy; and c. high temperature densification of the vanadium, chromium and titanium alloy, and obtaining of dense low-hydrogen vanadium, chromium and titanium alloy sintered billet. By using a low-temperature and high-vacuum part for dehydriding, activated sintering and high-temperature sintering densification, the content of hydrogen in the alloy is less than 20ppm, and the density is more than 96%.

Description

technical field [0001] The invention relates to the technical field of partial dehydrogenation, activation sintering and densification of vanadium-chromium-titanium alloy hydrides, in particular to dehydrogenation in the sintering process of vanadium-chromium-titanium alloy cold compact, reducing cracking tendency, and improving the performance of vanadium-chromium-titanium alloy. Methods of densification and alloying. Background technique [0002] Vanadium-chromium-titanium alloy has low radiation activation, excellent mechanical properties, high thermal conductivity, excellent radiation swelling resistance, low thermal expansion, high creep strength, and can withstand heat 4 to 7 times higher than stainless steel Load and other advantages, more and more used in aviation, national defense, nuclear fusion and high temperature environment and other fields. [0003] In the 1960s, the United States took the lead in starting the basic research work on vanadium alloys. The main ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C27/02
Inventor 董鲜峰杨维才曾大鹏林波李启寿孙钊龙亮甘杰谢金华边崇颖陈志陈慧陈伟
Owner SICHUAN INST OF MATERIALS & TECH
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