研究了配副硬度差与磨损率的关系，根据这种关系确定了最佳配副组合。
By investigating the relations of hardness difference to wear rate, the best friction pair mate was ascertained.
这也意味著它们在硬度、强度、能量吸收或传导能力方面比制造它们的原材料要差。
This means they are less stiff, strong, energy absorptive or conductive than the bulk of the raw materials that they are made out of.
然而，在某些应用条件下，钛合金的硬度低，摩擦系数大，耐磨性差。
However, in some application conditions, low hardness, big friction coefficient and poor wear resistance confine its extensive application in engineering.
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