The coesite mainly changed quartz glomerocryst which made its including minerals creat radial cracks;
柯石英多已转化为石英聚晶，并使包裹它的矿物产生放射状胀裂纹；
The successful application of PCD, PCBN glomerocryst materials in automotive manufacturing field are presented for the improvement of domestic superhard machining technology.
通过实例介绍了PCD、PCBN两种聚晶材料在汽车制造领域中的成功应用，旨在提高我国超硬加工的技术水平。
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