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Table 5 Mean grey relational grade at each level

From: Taguchi-Grey relation analysis for assessing the optimal set of control factors of thermal barrier coatings for high-temperature applications

Process parameters Grey relational grade Max.–Min. Rank
Level (1) Level (2) Level (3) Level (4)
Coating Type 0.3718 0.4247 0.5390 0.7708 0.3990 1
Coating Side Temperature, °C 0.4987 0.5516 0.5568 0.4993 0.0581 4
Coating Thickness, μm 0.4425 0.4860 0.5282 0.6497 0.2072 2
Bond Coating Thickness, μm 0.5251 0.5723 0.5255 0.4834 0.0888 3
Total mean GRG = 0.5266