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Types and Performance Analysis on Superhard Material Cutting Tools

It does not contain any metal catalysts in the CVD diamond, whose thermal stability and hardness are largely similar to natural diamond. CVD diamond has strong abrasion resistance and high hardness

From: www.iabrasive.comDate: 2016-03-09 09:30:16Views: 639

It does not contain any metal catalysts in the CVD diamond, whose thermal stability and hardness are largely similar to natural diamond. CVD diamond has strong abrasion resistance and high hardness, which is the worldwide-recognized the hardest tool materials.

In addition, CVD diamond also has a small friction coefficient, high thermal conductivity, good cutting effect and many other advantages, which has very good effect in the metal and nonmetal material cutting. But the thermal stability of CVD diamond is poor, and the hardness is too high but the toughness is not enough, which is easy to cause carbonization phenomenon under the condition of high temperature and cutting. Therefore, it can not be used for grinding and processing hard alloy, steel alloys and other materials.

Polycrystalline cubic boron nitride (PCBN) cutting tools can be divided into polycrystalline cubic boron nitride composite films, the overall polycrystalline cubic boron nitride cutting tools and electroplated CBN cutting tools according to the different composition.

Polycrystalline cubic boron nitride is a kind of widely used superhard cutting tool material, which has high abrasion resistance and thermal stability, and is suitable for most machining operation. And its material source is relatively broad and it has lower manufacturing, cost compared with diamond. Thus, it becomes the main selection of machining cutting tool material.

Synthetic polycrystalline diamond is a kind of material combining diamond single crystal by adding metal coagulant under high temperature and high pressure. In terms of hardness, its hardness is between CVD diamond and natural diamond, but its toughness is higher than them,. At the same time, it also has good compatibility and weldability. At present, synthetic polycrystalline diamond is mostly used for processing and cutting of precision small parts.

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