What is the common knowledge of diamond coatings in diamond tools?

- Dec 25, 2019-

What is the common knowledge of diamond coatings in diamond tools?

Diamond tools have the advantages of extremely high hardness and wear resistance, low friction coefficient, high elastic modulus, high thermal conductivity, low thermal expansion coefficient, and small affinity with non-ferrous metals. Before selecting and using diamond coated tools, users need to know the following common knowledge about diamond coated tools:

1, diamond coated tools have different life

Like any other tool, the life of diamond-coated tools is different, and it depends on the material to be cut, the selected feed rate and cutting speed, and the geometry of the workpiece. Generally speaking, the life of diamond-coated tools for processing graphite is 10-20 times that of uncoated carbide tools, and in some cases it can be even longer.

2, the problems of diamond tools

Diamond coating peeling can prevent the coating from peeling off. It is a serious problem for diamond coated tools and a common problem (especially when processing materials such as carbon fiber), which will make the tool life difficult to predict. In the late 1990s, interface chemistry was identified as an important factor affecting the adhesion properties of diamond coatings.

3, the difference between CVD diamond coating and amorphous diamond coating

Amorphous diamond (also known as diamond-like carbon) is a carbon film deposited by the PVD process. It has both a part of diamond SP3 bond and a part of carbon SP2 bond; its film formation hardness is very high, but it is lower than the hardness of diamond film; its thickness is also thinner than the diamond film we usually deposit. When processing graphite, the life of amorphous diamond coated tools is 2-3 times that of uncoated carbide tools.