Abstract
When a copper and a silicon test specimen were rubbed against each other under a very low contact pressure, with a load applied in the direction to pull apart the test specimens (negative normal load) to offset the attraction active between them., the friction coefficient decreased. The decrease of friction coefficient was considered to be due to the lubricating effect of a liquid film formed between the solid surfaces, and friction tests were carried out with variable sliding speeds to test this hypothesis. The result showed two cases: one of friction coefficient increasing and the other decreasing with sliding speed. This can be explained by the decreased surface area of direct contact between the two solids, and the viscous resistance of fluids, respectively.
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