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Method for manufacturing refractory metal pipe

A technology for refractory metals and pipes, which is applied in the field of preparation of refractory metal pipes, can solve the problems of low material utilization, low production efficiency, and high production costs, and achieve fine and uniform grains, high production efficiency, and comprehensive finished products high rate effect

Active Publication Date: 2011-05-25
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Welding usually uses electron beam or laser welding. The disadvantage of this method is that the production cost is high, and the grains around the weld are coarse, which is easy to become a source of defects.
Deep hole drilling is a method of processing solid metal blanks into holes through mechanical equipment. The disadvantages of this method are high production cost, low production efficiency and low material utilization rate. For small diameter molybdenum, tungsten and their alloy pipes, it is even impossible processing

Method used

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Examples

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Effect test

preparation example Construction

[0017] A method for preparing a refractory metal pipe, which is characterized in that the steps of the preparation process include: (1) preparing a tube blank by pressing refractory metal powder, sintering and machining; (2) preparing the tube blank in the prepared tube blank The tube cavity is densely filled with alumina powder; (3) the tube billet filled with alumina powder is subjected to swaging; (4) heat treatment; (5) mechanical processing to obtain refractory metal tube products.

[0018] The present invention will be further described below in conjunction with specific implementation examples.

Embodiment 1

[0020] Taking the production of molybdenum tubes with an inner diameter of f6mm as an example,

[0021] Commercially available molybdenum powder was selected, with a purity of 99.95% and a particle size of 3.8 μm. A molybdenum tube with an outer diameter of f16, an inner diameter of f12 and a length of 400mm was prepared through pressing, sintering and mechanical processing. Then the molybdenum tube is filled with alumina powder, and constant vibration is required during the filling process to compact the filler. Heat the molybdenum tube billet to 1200°C and hold it for 5-10 minutes for swaging. The final swaging size is a molybdenum tube with an outer diameter of f10, an inner diameter of f6 and a length of 700mm. After that, heat treatment is carried out at about 900°C for 1 hour, and a molybdenum tube with a relatively large length and diameter is obtained by machining.

Embodiment 2

[0023] Taking the production of tungsten tube with an inner diameter of f10mm as an example,

[0024] Commercially available tungsten powder was selected, with a purity of 99.95% and a particle size of 2.8 μm. First, a molybdenum tube with a diameter of f24, an inner diameter of f16 and a length of 500mm is prepared through pressing, sintering and machining. Then the molybdenum tube is filled with alumina powder, and constant vibration is required during the filling process to compact the filler. Heat the tungsten tube billet to 1400°C, keep it warm for 10-20 minutes for swaging. The final swaging size is a tungsten tube with an outer diameter of f14, an inner diameter of f10, and a length of 1600mm. After that, heat treatment is carried out at about 900°C for 1 hour, and a tungsten tube with a relatively large length and diameter is obtained by machining.

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PUM

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Abstract

The invention provides a method for manufacturing a refractory metal pipe and relates to a method for manufacturing near-net molding of molybdenum pipes, tungsten pipes and molybdenum and tungsten alloy pipes. The method comprises the following steps of: (1) molding refractory metal powder by compression, sintering and machining to obtain a pipe billet; (2) compactly filling the pipe cavity of the manufactured pipe billet by using aluminum oxide powder; (3) swagging the pipe billet filled with the aluminum oxide powder; (4) thermally treating; and (5) machining to obtain the refractory metal pipe. By the method, the manufactured pipe has high density, refined and uniform crystalline grains and fewer defects in comparison with a sintered pipe; moreover, the pipe performance is improved, the cuttings discharge is low, and the manufacturing efficiency is high; the diameter of the tungsten pipe and the molybdenum pipe can be adjusted flexibly; and the refractory metal pipe has outstanding cost advantage. The method is simple in production, low in investment, short in process flow, low in metal consumption, high in comprehensive yield rate and fast in response, and can be used for conveniently and quickly manufacturing the molybdenum pipes, the tungsten pipes and the molybdenum and tungsten alloy pipes of different specifications in mass production.

Description

technical field [0001] The invention discloses a preparation method of a refractory metal pipe, relating to a preparation method for near-net shape of molybdenum, tungsten and alloy pipes. Background technique [0002] Molybdenum, tungsten and their alloys are widely used in aerospace, metallurgy and other departments due to their high strength, hardness and corrosion resistance. Molybdenum-based alloy pipes containing 25% and 30% tungsten have excellent performance in preventing molten zinc corrosion, and can be used to make molten zinc pumps and electrolytic zinc electrodes, nuclear fuel purification and electroplating equipment pipelines, stirring shafts, etc. Molybdenum, tungsten and their alloy pipes can also be used as thermocouple casings and other high temperature resistant casings. Generally, for refractory metal pipes with relatively large length and diameter, the preparation methods include welding and deep hole drilling. Electron beam or laser welding is usuall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/12B22F3/17B22F3/24
Inventor 朱琦王林赵虎
Owner JINDUICHENG MOLYBDENUM CO LTD
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