n.多晶性(多晶结晶度)
CVD diamond thick film is a pure diamond material with full polycrystallinity synthesized by chethecal va-por deposition method.It can be in a thick sheet form of freestanding. 金刚石厚膜片是采用化学气相沉积的方法制备出来的一种金晶质多晶纯金刚石材料，其物理性能和天然金刚石非常接近，而化学性质则完全相同。
polycrystallin diamond wire drawing die 多晶金刚石拉丝模
