Aug 07, 2018
Until the 1980s, there were no coated carbide grades. At that time, in order to make cemented carbides applicable to the processing of different engineering materials, tool manufacturers made different carbide grades by adding different additives (such as hard phase or metal additives). The adoption of coating technology has greatly contributed to the development of the global mechanical processing industry; most of today's carbide grades are coated. This new technology also brings additional benefits, allowing certain grades to be tailored to the processing of a particular type of material being processed. There is no need to add a wide variety of additives to the cemented carbide substrate; this reduces the number of cemented carbide substrates and makes the production process control more stable.
Coating technology continues to evolve in two fundamental directions: chemical vapor deposition (CVD) and physical vapor deposition (PVD). A major development in CVD coatings has come from the introduction of alumina ceramic coatings. Alumina ceramic coatings provide excellent thermal insulation, wear resistance and chemical stability at high temperatures, allowing the tool to be processed at higher cutting speeds.
PVD coatings were introduced into cemented carbide production in the late 1980s. PVD coatings have achieved breakthroughs in overcoming many of the challenges in manufacturing in the field of nanoscale coatings. The PVD coating thus provides a new level of nano-coating with higher wear resistance. Compared to the conventional PVD coating method, the coating shown in Figure 3 is compounded by a coating with a maximum of 50 nm (nanometer) and has been shown to greatly increase the bond strength of the coating.
The continuous advancement of cemented carbide insert production technology comes from the development of many fields. More advanced pressing technology, sintering technology, coating technology and coating post-processing technology, more surface treatment methods, more optimized processing of the cutting edge of the blade, enabling the production of indexable inserts to be modern metal The processing industry offers a solution that is more suitable for its efficient processing needs.