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Preparation method of molybdenum alloy

A technology of molybdenum alloy and molybdenum powder, which is applied in the field of molybdenum alloy material preparation, can solve problems such as the reduction of the purity of aluminum alloys, achieve the effects of increasing purity, improving plasticity, and solving low-temperature brittleness

Inactive Publication Date: 2020-04-07
南通光明钼制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution adopts vacuum furnace sintering forming, and the sintering does not control the pressure, which leads to the molybdenum powder easily reacting with impurities such as carbon, hydrocarbons or carbon oxides to form carbon at a temperature above 800 degrees, which greatly reduces the purity of the aluminum alloy.

Method used

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  • Preparation method of molybdenum alloy
  • Preparation method of molybdenum alloy
  • Preparation method of molybdenum alloy

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preparation example Construction

[0021] This case proposes a method for preparing a molybdenum alloy, which includes the following steps: uniformly mix molybdenum powder and strontium powder, press and form after isostatic pressing, and obtain a pressed green body; as an inventive point of the present invention, the pressed green body is then The body is put into a hot isostatic pressing device for sintering, and then cooled to obtain a molybdenum alloy; the mass ratio of the molybdenum powder and strontium powder is 1: (0.005-0.01), and the steps of the isostatic pressing molding process are as follows: Compact the dry mixture with a pressure of 800MPa ~ 1800MPa and hold the pressure for 15min ~ 30min to obtain a compacted block, and then put the compacted body into the mold of the hot isostatic pressing equipment for sintering. The sintering process is: holding, etc. The static pressure is 800MPa~1800MPa, and the temperature is continuously raised to 1500℃~2000℃ at a heating rate of 6.5℃ / min~8.5℃ / min, and th...

Embodiment 1

[0032] A method for preparing a molybdenum alloy comprises uniformly mixing molybdenum powder and strontium powder, and the particle size of the molybdenum powder and strontium powder is not greater than 300 mesh. Press molding after isostatic pressing to obtain a pressed green body; then put the pressed green body into a hot isostatic pressing device for sintering, and then cool to obtain a molybdenum alloy; the mass ratio of the molybdenum powder and strontium powder is 1 : 0.005, the step of the isostatic pressing molding process is to use 800MPa pressure to compact the dry mixture and hold the pressure for 15min to obtain a compacted block, and then put the pressed green body into the mold of the hot isostatic pressing equipment Sintering. The sintering process is as follows: keep the isostatic pressure at 800 MPa, continue to raise the temperature to 1500° C. at a heating rate of 6.5° C. / min, and keep the temperature for 3 hours to obtain a molybdenum alloy.

[0033] Spec...

Embodiment 2

[0038] A method for preparing a molybdenum alloy comprises uniformly mixing molybdenum powder and strontium powder, and the particle size of the molybdenum powder and strontium powder is not greater than 300 mesh. Press molding after isostatic pressing to obtain a pressed green body; then put the pressed green body into a hot isostatic pressing device for sintering, and then cool to obtain a molybdenum alloy; the mass ratio of the molybdenum powder and strontium powder is 1 : 0.01, the step of the isostatic pressing molding process is to use 1800MPa pressure to compact the dry mixture and hold the pressure for 30min to obtain a compacted block, and then put the pressed green body into the mold of the hot isostatic pressing equipment Sintering, the sintering process is as follows: keep the isostatic pressure at 1800MPa, continue to raise the temperature to 2000°C at a heating rate of 8.5°C / min, and keep the temperature for 3h-4h to obtain a molybdenum alloy.

[0039] Specifical...

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Abstract

The invention discloses a preparation method of a molybdenum alloy. The method comprises the following steps that: molybdenum powder and strontium powder are uniformly mixed, an obtained mixture is subjected to isostatic pressing treatment and compression molding sequentially, so that a compressed blank can be obtained; and the pressed blank is put into hot isostatic pressing equipment to be sintered, and then the molybdenum alloy is obtained after cooling is performed. The mass ratio of the molybdenum powder to the strontium powder is 1: (0.005- 0.01). The isostatic pressing molding treatmentfurther comprises the following steps that: a dried mixture is compacted with pressure of 800MPa-1800MPa and is subjected to pressure maintenance for 15-30 minutes, so that a compacted block body isobtained; and the pressed blank is placed into the mold of the hot isostatic pressing equipment so as to be sintered. According to the sintering process of the pressed blank, isostatic pressing pressure is kept to range from 800 MPa to 1800 MPa; temperature continues to be increased to 1500 DEG C to 2000 DEG C at a temperature increasing rate of 6.5 DEG C / min to 8.5 DEG C / min; and the temperatureis kept for 3 h to 4 h, and the molybdenum alloy is obtained.

Description

technical field [0001] The invention relates to the technical field of molybdenum alloy material preparation, in particular to a method for preparing molybdenum alloy. Background technique [0002] Molybdenum alloy is a non-ferrous alloy composed of molybdenum as the matrix and adding other elements. The main alloying elements are titanium, zirconium, hafnium, tungsten and rare earth elements. Titanium, zirconium, and hafnium elements not only solid-solution strengthen the molybdenum alloy and maintain the low-temperature plasticity of the alloy, but also form a stable and dispersed carbide phase to increase the strength and recrystallization temperature of the alloy. Molybdenum alloy has good thermal conductivity, electrical conductivity and low expansion coefficient, and has high strength at high temperature (1100-1650°C), and is easier to process than tungsten. It can be used as the grid and anode of the electron tube, the supporting material of the electric light sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C27/04B22F1/00B22F3/04B22F3/15B22F9/22
CPCC22C1/045C22C27/04B22F3/04B22F3/15B22F9/22B22F1/05
Inventor 王森锦梁宏王再勇王再星丁夕陈松凯
Owner 南通光明钼制品有限公司
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