聚晶钻石Polycrystalline Diamond

聚晶钻石Polycrystalline Diamond是由人工使用高温及高压的方式制作出来的，广泛地应用到各产业的加工，聚晶钻石硬度HV6,500~ HV 8,000，为硬质合金的 80~120倍，而导热系数高(700W/mK)、热胀系数低(0.9×10)、磨量弹性高且摩擦系数较低(0.1～0.3)，聚晶钻石大致可分为PCD及CVD。
PCD钻石，是以钴为促进剂，将细粒的钻石黏结于碳化钨之上或包裹在内，置入高压装置并加热，经过烧结而形成复合体，呈无序排列、无方向性、硬度均匀。

聚晶钻石具有以下优点：
1.在冲击较大时只会产生小晶粒破碎
2.可满足大型加工刀具的需要，如：铣刀。
3.可制成特定形状以适合于不同加工的需要。
4.可设计或预测产品的性能，赋予产品必要的特点以适应它的特定用途。

聚晶钻石通常用来进行精密切削加工和普通半精密加工，还可用作较大切削量的粗加工和断续加工(如：铣削等)，著实地扩充了钻石刀具材料的使用范围。
聚晶钻石可加工材料：有色金属和极耐磨的高性能非金属材料，如铝合金、铜及其合金、碳/石墨、塑胶/复合材料等。 

※刀具类型： 
成型钻铰刀 
单刃铣刀 
成型铣刀 
微小铣刀 
微小内孔刀 
刀片 
车刀 
活塞车刀套组

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Polycrystalline Diamond is manually produced in the way of high pressure and high temperature. It is broadly applied in all kinds of industrial processing. Its hardness is HV6, 500~HV8, 000. It is 80~120 times as hard as hard alloy. The specialties of Polycrystalline Diamond are high heat conduction (700W/mK), low Coefficient of thermal expansion (0.9×10), high abrasion resistance, and quite low friction coefficient.
Polycrystalline Diamond can be classified into two types---PCD and CVD. PCD is formed by high pressure and high temperature. By using cobalt as accelerant, grains will cohere to Tungsten Carbide or be wrapped by Tungsten Carbide, then, it is put in high pressure device and heated; after being sintered, it becomes a composite. PCD shows no sequence, no aspect, and even hardness.

Polycrystalline Diamond has the following advantages:
1. Under big impact, Polycrystalline Diamond only produces some little crystalline grains.
2. Polycrystalline Diamond can be used in bigger cutting tools, such as milling cutters.
3. Polycrystalline Diamond can be produced into specially designated shapes for different processing demands.
4. Specific functions can rendered to cutting tools by Polycrystalline Diamond to fit their specific applications.

Polycrystalline Diamond is usually used to do precision cutting and half-precision cutting, rough cutting,and non-successive cutting (such as milling). Polycrystalline Diamond has extended the application scope of diamond cutting tools.
The applications of Polycrystalline Diamonds are Non-Ferrous Metal, Non-Metal Material, ex.: aluminum alloy, copper and its alloy, carbon/graphite, plastic, plastic/complex materials, and etc. 

※ Tool Types: 
 Milling tool 
 Forming tool 
 Drilling and Reaming Tool 
 Single Flute Milling Tool 
 Micro Milling Tool 
 Micro Internal Turning Tool 
 Inserts 
 Chamfering Tool 
 Rough Polishing Tool 
 Turning Tool 
 Whole Set of Machining Tools for Piston Machining

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