Table 1.

Preparation process and parameters of ZrTiN gradient coating.

Step.	Layer or Interface	Ti Current (A)	Zr Current (A)	N2 Flowrate (sccm)	Time (min)
1	Innermost transition	60	0	0	2
2	Intermediate transition	60	90	0	2
3	Outermost transition	60	120	0	2
4	-	60	120	60	2
5	Innermost coating	60	120	120	25
6	-	64	116	120	2
7	-	67	113	120	2
8	Intermediate coating	70	110	120	25
9	-	74	106	120	2
10	-	77	103	120	2
11	Outermost coating	80	100	120	25