NiP Composite Coating of Piston Ring by Plate and Bumper Method
401
Table 3 (a) Micro-Vickers hardness in HV 0.05 of NiP without addition of SiC, (b) micro-Vickers
hardness HV 0.05 of NiP with addition of SiC 5 g/lt, (c) micro-Vickers hardness in HV 0.05 of NiP
with addition of SiC 50 g/lt and (d) micro-Vickers hardness in HV 0.05 of NiP with addition of SiC
100 g/lt
(a)
Dunking speed of special fixture
As plated
Heat treated
50 cycles per minute
322
541
75 cycles per minute
325
555
100 cycles per minute
350
560
(b)
Dunking speed of special fixture
As plated
Heat treated
50 cycles per minute
418
680
75 cycles per minute
420
700
100 cycles per minute
460
720
(c)
Dunking speed of special fixture
As plated
Heat treated
50 cycles per minute
518
780
75 cycles per minute
555
825
100 cycles per minute
580
885
(d)
Dunking speed of special fixture
As plated
Heat treated
50 cycles per minute
708
920
75 cycles per minute
751
965
100 cycles per minute
828
1015
3.2 Micro-structure
The photograph of micro-structure of the cross section of the piston ring was taken
in Zeiss optical microscope at 500× to study the incorporation of composite material
SiC as shown in Fig. 5a–c.
3.3 SEM/EDAX Analysis
The piston ring periphery was analysed in FESEM Zeiss make to study the incorporation of SiC [2] of sample A (SiC 5 gms/lt at dunking speed 150 cycles per minute)
and sample B (SiC 100gms/lt at dunking speed 150 cycles per minute) at 500×. The
given below are the results of SEM images and EDAX results as shown in Fig. 6a, b.