Gear hobbing is one of the core technologies in gear manufacturing. The quality achieved in this process has a high influence on the following processes such as gear grinding and gear honing.

Table of carbide hob coating types
No.	coating material	hardness(HV)	Coefficient of friction for steel (dryness)	Internal stress(Gpa)	Maximum applicable temperature (Celsius)	The color of the coating	coating structure
1	TIN	2300	0.4	-2.5	600	golden	monolayer
2	AlCrN	3200	0.35	-3	1100	blue grey	monolayer
3	TiCN	3000	0.4	-4	400	blue grey	multilayer
4	WC/C	1000/2000	0.10-0.20	-1	300	Black gray	laminal
5	CrN	1750	0.5	0.75	700	silver gray	monolayer
6	polycrystalline diamond	8000-10000	0.15-0.20		600	LightGray	monolayer
7	iAlN	3300	0.30-0.35	0.866666667	900	Purple-grey	Nano-structure
8	TiCN+TiN	3000	0.4	-4	400	golden	Multi-layered, sloping
9	TiAlN+ WC/C	3000	0.15-0.20	0.85	800	LightGray	multilayer,laminal
10	DLC(a-C:H)	2500	0.10-0.20		350	Black gray	monolayer
11	TiAlN	3300	0.25	-0.866666667	900	Purple-grey	Nano-structure
12	TiAlN	3300	0.4	0.857142857	900	blue grey	Nano-structure
13	TiAlN	3500	0.4	-4	800	Purple-grey	monolayer

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