There are few other materials, such as cemented carbides, that have had such a significant impact on the global economy and industrial civilization.This hard and wear-resistant materials are widely used in the manufacture of a variety of different products, such as pen nib, rod guide ring, wear parts, dental drill,and its most important use is the manufacture of cutting tool. In fact, coated carbide tools are the most widely used cutting tools in the market. Such tools significantly improve the productivity of the metal cutting process, thereby greatly reducing the cost of the production of many daily necessities.

However, at present, a variety of advanced coating technology and coating materials emerge in endlessly, it is not always easy to select the best coated blade grade for a specific processing task. Select the best blade from thematerial, because the type of material to be processed to determine whether the need for hard alloy coating plays a key role.

Coated cemented carbide inserts are essential for the machining of ferrous materials such as iron, cast iron, steel or stainless steel. In most cases, the use of coated inserts is also the best choice for cutting high temperature alloys, especially when they are capable of cutting to the middle / high level. Processing of titanium alloys can also benefit from the coating, especially in the absence of high pressure coolant.

Uncoated cemented carbide inserts suitable for processing non-ferrous metals (e.g. aluminium). In fact, due to the aluminum is relatively soft, and easy to produce a built-up edge, it is best to use extremely sharp uncoated cutting edge processing. Other materials that do not require the use of coated inserts include brass, bronze, a variety of composite materials and wood. However, the use of appropriate diamond coating can greatly improve the machining efficiency and tool life.

Choosing the appropriate coating type is the most difficult part of the coating blade. After all, the various processing tasks vary widely, so careful consideration should be given to the coating process and coating materials. In addition, there is no simple answer to the question of how to choose the right blade coating. Understanding some of the basic knowledge of coating processes and coating materials will help to eliminate some of the uncertainties in the selection of cemented carbide inserts.

Chemical vapor deposition (CVD) and physical vapor deposition (PVD) are two main cemented carbide blade coating processes, each with its own characteristics and advantages. CVD coating is thick (usually 10 - 20 m), and has good wear resistance, especially suitable for cutting steel and cast iron, and widely used in turning.

However, unfortunately, this thick coating may have an adverse effect on the toughness of the cutting edge. The PVD coating is thin (typically 2 - 3 m), and has a better toughness and smoother surface than the CVD coating. Therefore, this kind of coating is very suitable for the processing of high temperature alloy, titanium alloy and stainless steel, which are difficult to be machined.

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