Improvement in Tribological Performance of Ni-P-TiO₂ Composite Coatings Using Taguchi Technique with Grey Relational Analysis

Table 2

Design parameters and their levels.

Design factors	Designation	Unit	Levels
			1	2	3
Normal load		N	50		100
Wear track diameter		mm	80		120
Duration of test		Seconds	300		900

Initial condition.