Ti-W-Si-Al Based Coated Tungsten Carbide End Mills In Cutting Hardened Steel Ⅳ

In last part we know that tungsten carbide tools with (Ti,W)N coating film have superior critical scratch load to high speed cutting hardened steel in mass production. Here in this part we explain the superior quality of (Ti,W,Si)N coating film.

Moreover, the titanium/tungsten-based-coated tungsten carbide tool was evaluated through machining of low-carbon steel AISI 5120H, and showed greatly improved performance. However, the hardness of the (Ti,W)N coating film was lower than that of the (Ti,Al)N coating film. So, a (Ti,W,Si)N coating film, which is a titanium/tungsten/silicon-based   coating film, has been developed.

This titanium/tungsten/silicon-based coating film exhibits both superior critical scratch load and hardness compared with TiN/(Ti,Al)N coating film. In cutting AISI 5120H, the wear progress of the (Ti,W,Si)N-coated cemented tungsten carbide tool is slower than that of the TiN- and (Ti, Al)N-coated tools. Therefore, titanium/tungsten/silicon coating is an effective tool material because it has good wear resistance.

(To be continued. This article is divided into several parts. Here is part 4. For part 3 please refer to http://news.chinatungsten.com/en/tungsten-information/80791-ti-10485; for part 5, please refer to )