Optimization on Tribological Characteristics of Stir-Casted AA7076/Nano Zirconium Dioxide/Boron Nitride Hybrid Composites by Taguchi Method

Table 2

specifications and levels for the stir-casting process.

Specifications		Levels
		1	2	3	4
Percentage of reinforcement	(%)	0	4	8	12
Agitation speed	(rev/min)	450	500	550	600
Agitation time	(min)	15	20	25	30
Temperature at molten stage	(°C)	700	750	800	850