Tailoring Aerogel for Thermal Spray Applications in Aero-Engines: A Screening Study
Table 2
Mean responses of the orthogonal experiment for the spray-drying process.
Treatment
Independent variables
Responses (mean ± SD)
Powder content (vol.%)
YSZ : aerogel
Dispersant (wt.%)
Binder (wt.%)
Inlet temperature (°C)
Atomization pressure (bar)
Feeding rate (ml/min)
D50 (μm)
Volume fraction
Uniformity
1
15
1 : 1
0.3
4
150
0.9
18
16.531 ± 0.483
35.89 ± 1.356
0.423 ± 0.003
2
15
1 : 3
0.6
6
180
1.0
21
17.761 ± 1.022
41.19 ± 1.267
0.417 ± 0.002
3
15
1 : 5
0.9
8
200
1.1
24
16.882 ± 0.971
37.39 ± 1.124
0.417 ± 0.001
4
20
1 : 1
0.3
6
180
1.1
24
20.309 ± 0.481
51.27 ± 1.159
0.431 ± 0.003
5
20
1 : 3
0.6
8
200
0.9
18
20.793 ± 1.145
53.09 ± 2.050
0.416 ± 0.003
6
20
1 : 5
0.9
4
150
1.0
21
16.173 ± 0.590
34.43 ± 1.083
0.427 ± 0.002
7
25
1 : 1
0.6
4
200
1.0
24
21.227 ± 0.484
54.30 ± 1.024
0.442 ± 0.004
8
25
1 : 3
0.9
6
150
1.1
18
19.803 ± 0.749
49.44 ± 2.101
0.414 ± 0.002
9
25
1 : 5
0.3
8
180
0.9
21
19.464 ± 0.281
48.22 ± 1.040
0.448 ± 0.002
10
30
1 : 1
0.9
8
180
1.0
18
22.892 ± 1.592
57.79 ± 1.294
0.458 ± 0.002
11
30
1 : 3
0.3
4
200
1.1
21
21.484 ± 0.932
55.23 ± 1.842
0.437 ± 0.002
12
30
1 : 5
0.6
6
150
0.9
24
20.252 ± 0.994
51.11 ± 1.134
0.418 ± 0.002
13
35
1 : 1
0.6
8
150
1.1
21
22.587 ± 0.826
57.52 ± 1.443
0.450 ± 0.007
14
35
1 : 3
0.9
4
180
0.9
24
21.702 ± 1.442
55.07 ± 2.002
0.454 ± 0.002
15
35
1 : 5
0.3
6
200
1.0
18
22.003 ± 0.545
54.60 ± 0.644
0.488 ± 0.016
16
40
1 : 1
0.9
6
200
0.9
21
27.272 ± 0.666
60.39 ± 1.111
0.511 ± 0.007
17
40
1 : 3
0.3
8
150
1.0
24
20.916 ± 0.641
51.96 ± 1.261
0.473 ± 0.004
18
40
1 : 5
0.6
4
180
1.1
18
20.599 ± 0.540
51.72 ± 2.216
0.466 ± 0.002
Each experiment was carried out in triplicate. Values of responses are reported by Mastersizer 2000E analyser in 3 significant figures. SD: standard deviation.
