Microstructure of Al-Si Slurry Coatings on Austenitic High-Temperature Creep Resisting Cast Steel

Table 1

The rotatable design for three-factor interactions with coded and real variables.

Run number/number of coating	Temperature		Time		Ratio Al/Si
	x1	X1/°C	x2	X2/h	x3	X3
1	−1	800	−1	5	−1	6
2	+1	1000	−1	5	−1	6
3	−1	800	+1	10	−1	6
4	+1	1000	+1	10	−1	6
5	−1	800	−1	5	+1	12
6	+1	1000	−1	5	+1	12
7	−1	800	+1	10	+1	12
8	+1	1000	+1	10	+1	12
9	−1.682	732	0	7.5	0	9
10	+1.682	1068	0	7.5	0	9
11	0	900	−1.682	3.3	0	9
12	0	900	+1.682	11.7	0	9
13	0	900	0	7.5	−1.682	4
14	0	900	0	7.5	+1.682	14
15	0	900	0	7.5	0	9
16	0	900	0	7.5	0	9
17	0	900	0	7.5	0	9
18	0	900	0	7.5	0	9
19	0	900	0	7.5	0	9
20	0	900	0	7.5	0	9