这表面有极高的硬度（60局。），耐磨性和耐腐蚀性，低摩擦系数。
This surface has extreme hardness (60 RC. ), excellent wear and corrosion resistance, and low coefficient of friction.
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.
氧化铬5.2比重2.5莫氏硬度，增强摩擦力，因为高价格因而在世界的大多数地方不流行的。
Chromium Oxide Specific gravity 5.2, Moh hardness 2.5 Enhances friction, but not popular because of high price in most parts of the world.
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