Comparative Experimental Study of Tribo-Mechanical Performance of Low-Temperature PVD Based TiN Coated PRCL Systems for Diesel Engine

Table 9

Summary of mean COF and wear rate results.

PRCL system	Sample ID	Surface Roughness	Coating Thickness	Mean COF	Cylinder Liner Wear Rate (μg/min)	Piston Ring Wear Rate (μg/min)
PRCL 1 (As is scenario)	Uncoated Cylinder Liner against Cr Coated Piston Ring
	1	0.55μm	N/A	0.114	11.30	-2.0
PRCL 2	TiN Coated Cylinder Liner against TiN Coated Piston Rings
	1	Fine sample	1.920μm	0.222	11.67	0.67
	2	Rough sample	1.920μm	0.254	7.67	3
	3	Fine sample	3.523μm	0.165	8.67	2
	4	Rough sample	3.523μm	0.224	6.33	5.33
	5	Fine sample	5.120μm	0.06	5.33	5.33
	6	Rough sample	5.120μm	0.086	4.33	6.33
PRCL 3	TiN Coated Cylinder Liner against Cr Coated Piston Rings
	1	Fine sample	1.920μm	0.101	0.33	1.67
	2	Rough sample	1.920μm	0.088	-0.33	3.67
	3	Fine sample	3.523μm	0.12	-0.16	3.33
	4	Rough sample	3.523μm	0.104	-2.67	5.83
	5	Fine sample	5.120μm	0.128	-3	8.33
	6	Rough sample	5.120μm	0.111	-4.33	9.21
PRCL 4	Uncoated Cylinder Liner against TiN Coated Piston Ring
	1	0.55μm	N/A	0.157	13	0.54