The new TN620 and PV720 cermet grades are suitable for a wide variety of metal-cutting applications ranging from high-speed to low-speed machining.

Both TN620 and PV720 utilize a special graded composition to create a surface-hardening structure, which improves both hardness and toughness. By using tough cermet with improved chipping resistance and thermal shock resistance for the internal structure, and high hardness cermet for the surface structure, the new materials achieve superior fracture and abrasion resistance, as well as stable processing.

TN620 (silver) and PV720 (gold) metal-cutting inserts.
TN620 (silver) and PV720 (gold) metal-cutting inserts.

Kyocera Corporation has developed a new series of cermet grades which it says offer a 50% improvement in abrasion resistance over conventional materials.

By creating a composite of conventional cermet and high-melting-point metal-bonded phase, the resulting bonded phase are highly heat resistant. This improves adhesion resistance, chipping resistance and fracture resistance to provide a stable machined surface of superior quality.

The new materials offer improved flexural strength by incorporating a uniform ultrafine-particle ‘hard-phase’. In addition, high-melting-point metal binding phases increase compressive-stress effects for better fracture resistance.

The PV720 grade also includes Kyocera’s proprietary MEGACOAT NANO multilayer coating technology. Used for the first time on a cermet, MEGACOAT NANO provides improved abrasion and oxidation resistance for higher-efficiency machining with an improved surface finish.

This story is reprinted from material from Kyocera, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.