求翻译：测定材料的热膨胀系数发现添加了20%石墨的PTFE复合材料和铜基体的匹配性最好。在实验轧机上测试轴承的润滑性能，试验表明添加20%石墨的PTFE润滑性能良好，稳定性好。是什么意思？

Determination of the thermal coefficient of expansion to add 20% graphite ptfe composite materials and copper matrix matching the best. Test the lubrication performance test shows that 20% graphite ptfe good lubricating properties, good stability in the experimental mill.

Determine the coefficient of thermal material that add up to 20 per cent of graphite composite materials, and copper PTFE base of best match. Experiments on the mills of the bearing lubrication performance test, tests showed that adding 20 per cent of graphite PTFE lubrication performance is good, a

The determination material thermal-expansion coefficient discovered increased 20% graphite PTFE compound materials and the copper substrate match is best.In tests on the rolling mill to test the bearing the lubricity, the experiment indicated increases 20% graphite the PTFE lubricity to be good, the

Determination of coefficient of thermal expansion of the materials found that adding the 20% graphite PTFE composite and copper substrate of matching the best. In experimental testing bearings on mill's lubrication properties, add 20% graphite PTFE lubricating properties of good tests showed good st

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