Community Research and Development Information Service - CORDIS

Tribology test method

A tribology test method for high vapour pressure liquids has been completed. This method uses a pin on rotating ring method to determine friction coefficients and wear between surfaces lubricated by high vapour pressure liquids.

Friction and wear with pure DME have been studied, and the high wear nature of pure DME with basic fuel injection pump materials confirmed. DME results were compared to unlubricated surfaces, and were better than no lubrication, but far from results with acceptable diesel fuel.

Material tests have been performed with diamond like carbon coating on both parts. With DME, the friction was halved, but the wear was unacceptably high.

Tests with additional coating materials are planned and sample preparation underway.

The test method will provide a test method with which to correlate test results from future DME injection systems, and the intention is to eventually provide a test bench procedure for the development for materials in DME injection pumps prior to production. This method, when combined with results from lubricity testing, should be applicable to development of high-pressure pumps for a wide variety of fluids for transport (petrol, lpg, diesel fuel) as well as many other process technologies.

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