Tribological performance of two types of Si3N4 pairs and one SiC pair was examined at a pressure of 1300 Pa and a temperature of 800°C. Prior to friction tests, a transfer film was formed from a self-lubricating composite in atmospheric environment. Test results showed that the transfer film acted effectively as a lubricant to prevent surface damage and lower friction for Si3N4 pairs, but it was not effective for the SiC pair. This result confirms that transfer film lubrication is one of promising candidates of lubrication methods for re-usable space vehicles, in which operation at high temperature in low vacuum is required.

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