Optimization of Dual Coating Using Electroless Ni-P-Nano-TiO₂ and Plasma Yttria-Stabilized Zirconia on Piston Crown and Cylinder Liner in CI Engine

Table 5

Signal to noise ratio and normalization values of the experiment.

S/N ratio			Normalization
Thickness	Thermal resistance	Surface roughness	Thickness	Thermal resistance	Surface roughness
26.848	22.542	11.700	0.000	0.000	-1.000
27.604	22.670	11.056	0.135	0.102	-0.870
28.299	22.606	10.457	0.258	0.051	-0.749
30.881	23.106	8.404	0.718	0.447	-0.335
30.629	23.346	9.118	0.673	0.636	-0.479
31.126	23.227	10.457	0.762	0.542	-0.749
32.464	23.521	6.744	1.000	0.775	0.000
32.255	23.806	6.935	0.963	1.000	-0.039
32.041	23.693	7.330	0.925	0.911	-0.118