The NiCr bond coated piston and valve surfaces were coated with Cr2O3,
Cr2O3 + 50% Al2O3, Cr2O3
+ 75% Al2O3 powders by thermal barrier coating (TBC). The
influence of the coating layers on CO, CO2, HC and NOx was examined
both statistically and experimentally. The statistical investigation was
carried out by using Taguchi analysis. According to the experimental test
results obtained at different engine speeds, the sample with the highest CO2
value was found at 2600 rpm in the Cr2O3 + 75% Al2O3
coated diesel engine and the sample with the lowest CO value was found at 2600
rpm in the Cr2O3 + 75% Al2O3 coated
diesel engine. Also, the sample with the lowest NOx value was found
at 1400 rpm in the standard diesel engine and the sample with the lowest HC
value was found at 2600 rpm in the Cr2O3 + 75% Al2O3
coated diesel engine. Experimental results were analyzed by Taguchi
optimization method according to L16 (42) orthogonal array.
According to the statistical results obtained from ANOVA test, factor levels
affecting the exhaust emission values best were found. In general, better
emission values have been determined in diesel engines with bond coated
ceramic layers.
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