多孔钨材料及零件的研究进展*

doi:10.13385/j.cnki.vacuum.2023.02.01

Abstract

Abstract: The porous metal materials are a new type of metal materials with excellent properties. This review briefly describes the preparation methods and applicability of several commonly used porous metal materials.Then the application of porous tungsten materials in the fields of microwave vacuum devices and space electric propulsion technology is introduced, and the existing problems in the preparation of porous tungsten materials are pointed out. In response to these problems, the preparation process of porous tungsten materials and parts is studied in depth. The tungsten powder is classified by the classification technology. The results of the laser particle size tester show that the size of classified tungsten powder particles is more concentrated. The gas purification and detection system can remove residual oxygen and water in the hydrogen gas, and reduce the dew point of hydrogen from -50℃ to below -90℃, which provides a good sintering atmosphere for preparing the non-oxidized tungsten sponge matrix. Porous tungsten materials are prepared by cold isostatic pressing technology and high temperature sintering, and the porosity of porous tungsten materials is studied by mercury porosimeter. The pore size distribution becomes narrower and the pore size becomes more uniform. The porous tungsten-copper alloy materials are prepared by vacuum impregnation. The impregnation rate is much higher than that of copper impregnation under the hydrogen condition, and the impregnation rate is increased by more than 4%. The tungsten copper alloy substrate is heated by a high frequency heating coil crucible localized firing. The results show that this technology has the advantages of no residual on substrate surface, short time, no pollution to furnaces and environmental. The porous tungsten have been successfully used in the microwave vacuum electron devices.

Key words: porous metal material, porous tungsten, electric propulsion, vacuum impregnation, vacuum evaporation

CLC Number:

TN105.1

LIU Yan-wen, LU Yu-xin, ZHANG Xiao-lin, MENG Ming-feng, LI Fen, ZHAO Heng-bang, WANG Xiao-xia. Research Progress of the Porous Tungsten Materials and Parts[J].VACUUM, 2023, 60(2): 1-13.

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Research Progress of the Porous Tungsten Materials and Parts

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