Basic study of lubrication by tribo-coating for space machines

Koji Kato, Hyung Ja Kim, Koshi Adachi, Hideyuki Furuyama

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Lubrication in space machines is very important and is being developed world wide. However, to date, lubrication methods developed have not met with the requirement of the space industry. Many troubles of space machines have been caused by tribological problems in the past. In this study, therefore, we propose a new lubrication method called Tribo-Coating for space machines to answer requirements, and we prove its effectiveness from a view point of tribological properties such as low friction coefficient and long life. Optimum combinations of mating materials and lubricant for this method are selected using a pin-on-disk test machine with the tribo-coating system, and the effects of lubricating thickness and surface roughness on friction properties are investigated under optimum conditions. As a result, a minimum friction coefficient of 0.02 and a life-span of 350000 cycles are obtained by tribo-coating film of 70 nm thickness in one application. Furthermore, using the tribo-coating method, the possibility of unlimited life method of low and stable friction coefficient are suggested. Finally, we propose an empirical formula for the design of tribo-coating of recommendable friction pair.

Original languageEnglish
Pages (from-to)3237-3243
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Issue number600
Publication statusPublished - 1996


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