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2023

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What is the role of cemented carbide coating?

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Cemented carbide is known as "industrial tooth" because of its high hardness, high bending strength, strong wear resistance, corrosion resistance and other series of superior properties, and is widely used in oil and gas, coal drilling and production, engineering machinery, fluid control, marine equipment and other challenging industries. In these harsh environments, cemented carbide parts will inevitably encounter wear, erosion and other problems, which requires material engineers to find ways to make a protective layer for cemented carbide parts to extend the service life of cemented carbide parts. Cemented carbide coating is one of the most effective methods to protect the parts and prolong their service life. Today, Sidi's editor will talk to you about the role of cemented carbide coating? Why should we carry out cemented carbide coating?
When cemented carbide (including a series of cemented carbide products, such as cemented carbide materials, cemented carbide inserts, cemented carbide cutters, cemented carbide wear-resistant parts, cemented carbide dies, etc.) is used, the complex stress action on the surface and the thermal wear during high-speed operation will cause the wear of cemented carbide materials (especially cemented carbide inserts) to be very serious, resulting in the passivation of cemented carbide inserts, The service life of cemented carbide material is greatly reduced, and the production efficiency is greatly reduced. In some special industries, some cemented carbide products often have high hardness, but their toughness cannot meet the requirements, and their hardness cannot meet the requirements for use, and their wear resistance and service life are often unsatisfactory. So how can cemented carbide have high toughness and hardness at the same time?
In order to achieve the effect of both, people want to make every effort to improve the service life of cemented carbide products. Many material engineers have made unremitting efforts and multiple and repeated explorations and experiments. After nearly half a century of repeated experiments and practices, they have constantly summarized and improved the process, and finally found out how to make cemented carbide both high hardness and high toughness, So as to greatly improve its service life. That is to carry out coating treatment on the surface of cemented carbide, and coat the surface of cemented carbide with a special material with higher hardness and bending strength than cemented carbide - rare and precious metals. Including TiN, TiC, Ti (C, min), TiBN, TiB2, Al2O3, Ti (C, N) (CVD), TiN (PVD), etc., to improve the hardness and bending strength of cemented carbide surface. Because the coating material has higher hardness and wear resistance than cemented carbide, the wear resistance life of cemented carbide after coating treatment can be doubled.
In fact, the hard alloy coating is to modify the surface of the hard alloy. The physical modification of the hard alloy is mainly to form a single layer or multi-layer structure on the surface of the hard alloy matrix material through the coating method, thus endowing the hard alloy material with new properties.
The advantage of coating (modification) treatment on the surface of cemented carbide products is to make the surface of cemented carbide have higher hardness, especially after the modification of cemented carbide by multi-layer coating or multi-layer composite coating, it can significantly improve the wear resistance and service life of cemented carbide without losing its core toughness, and significantly improve the service performance of cemented carbide.
Another advantage of coating treatment of cemented carbide is that it can be selectively modified according to different purposes to achieve the desired best performance. For example, the coating modification of cemented carbide blade can significantly improve its wear resistance and heat resistance, thus achieving the purpose of improving its service life. Sidi Technology Co., Ltd. has specialized in producing a series of cemented carbide products for 14 years. It has mastered advanced technology in the surface modification of cemented carbide and has complete sets of equipment, which can meet the surface treatment requirements of customers.

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