PM Non Ferrous: Self-lubricating Copper Composites for Vacuum and Space
Self-lubricating Cu-MMCs for use in mechanical systems under vacuum or space are not commercially available till now, and usually, published papers on frictional behaviour of such Cu-MMCs report friction coefficients higher than 0,3. In order to improve the performances of the promising Cu-MMCs not...
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Published in | European Congress and Exhibition on Powder Metallurgy. European PM Conference Proceedings Vol. 4; p. 1 |
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Main Authors | , , , , |
Format | Conference Proceeding |
Language | English |
Published |
Shrewsbury
The European Powder Metallurgy Association
01.01.2004
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Online Access | Get full text |
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Summary: | Self-lubricating Cu-MMCs for use in mechanical systems under vacuum or space are not commercially available till now, and usually, published papers on frictional behaviour of such Cu-MMCs report friction coefficients higher than 0,3. In order to improve the performances of the promising Cu-MMCs not only in space applications but also in vacuum systems on ground, a PM-process was optimised to produce high quality composites with solid lubricants by avoiding reaction between copper and MoS^sub 2^ particulates. Two routes were followed: a hot compaction of "conventionally mixed" powders and a hot compaction of "coated particles", i.e. the particles were coated with copper before compaction. Cu-MMCs with two kinds of lubricant particles (MoS^sub 2^ and short carbon fibres) and contents up to 40v% were also produced. Compression tests at RT revealed that strength and modulus are higher for the Cu- MMCs based on coated particles. Pin-On-Disc tests confirmed friction coefficients under vacuum less than 0,1 at RT, and less than 0,2 at 300°C. [PUBLICATION ABSTRACT] |
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