It exhibits free cutting of difficult-to-machine stainless steels and features a tough substrate and a smooth MTCVD
Most recently, tool manufacturers introduced a MTCVD process for milling and turning applications.
In the unpublished study by Sheikh-Ahmad (1998), two carbide grades, namely WC-3.5 percent Co and WC-6.0 percent Co were coated by a commercial MTCVD coating provider.
The CP600 PVD coated grade provides excellent performance in both general machining and high-temperature alloy applications, while the recently introduced TP400 MTCVD
coated grade is ideal for stainless steel and cast iron machining.
Also in the works is another advance in coating technology--medium temperature chemical vapor deposition (MTCVD)--coating done at medium temperature that is expected to be even more crack resistant.
They included: SpectraTurn 4.0, three new thick CVD grades (500 series), five new MTCVD grades (400 series), 13 new chipbreakers and hundreds of inserts; a plethora of SpectraMill products; Q8/Q65 silicon nitride ceramic grades; VM Modular Quick Change Lathe Tooling System; shrinker connection system for rotary and lathe applications; HSK connection for rotary applications; and QDT Quick Delivery Tooling.
Physical Vapor Deposition (PVD) is a low-temperature process that produces very tough coatings with high lubricity; Medium Temperature Chemical Vapor Deposition (MTCVD
) is a medium temperature process that produces tougher, slightly less wear-resistant coatings than the traditional CVD process; Chemical Vapor Deposition (CVD) is a high temperature process that produces highly crater-resistant coatings with a good balance of toughness and wear resistance; and Thick Chemical Vapor Deposition (T-CVD) is a specialized CVD technology that produces very thick coatings which deliver excellent wear and crater resistance, with slightly lower fracture and built-up edge resistance than the standard CVD process.