Few other materials have had such a significant impact on the global economy and industrial civilization as cemented carbides. This high hardness wear-resisting material is widely used in the manufacture of various products, such as the tip of a ballpoint pen, the guide ring of a fishing rod, wear-resisting parts, dental drill bits, armor-piercing bullet cores, etc., and its most important use is to manufacture cutting tools. In fact, coated carbide cutting tools are the most widely used cutting tools on the market. Such tools significantly increase the productivity level of metal cutting processes, thereby greatly reducing the manufacturing costs of many everyday items.

However, it is not always easy to choose the best coating blade brand for a specific processing task with various advanced coating technologies and coating materials emerging in the market. It is better to start with the workpiece material, because the type of material processed plays a key role in determining whether the cemented carbide blade needs coating.

Coated carbide blades are essential for machining ferrous materials such as iron, cast iron, steel or stainless steel. In most cases, coated blades are also the best choice for cutting high temperature alloys (especially alloys with medium/high cutting performance). Machining titanium alloys also benefits from coating, especially without the use of high-pressure coolant.

The uncoated carbide blade is suitable for processing non-ferrous metal materials (such as aluminum). In fact, since aluminum is soft and prone to chip formation, it is best to work with extremely sharp uncoated cutting edges. Other workpiece materials that do not require coated blades include brass, bronze, a variety of composites, and wood. However, using the right diamond coating can greatly improve machining efficiency and tool life.

Choosing the right type of coating is the trickiest part of choosing a coated blade. After all, a variety of processing tasks vary, so you must carefully consider the coating process and coating materials. Moreover, there is no easy answer to the question of how to choose the right blade coating. Some basic knowledge of coating process and coating materials will help to eliminate some uncertainties in blade selection.

Chemical vapor deposition (CVD) and physical vapor deposition (PVD) are two major cemented carbide blade coating processes with their own characteristics and advantages. CVD coatings are thick and have excellent wear resistance, especially for cutting steel and cast iron, and are widely used in turning.

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