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

Table 7

Result of validation test.

	Initial condition	Optimum condition
		Prediction	Experimentation
Level
Friction coefficient	0.1618		0.134
Wear depth (µm)	9.92		2.53
Grade	0.688016	0.872929	0.953786

Improvement of grey relational grade = 0.26577.