Magnesium aluminate is the most common and well-known member of the Spinel series. The Curie temperature varies similarly with the sample composition in ceramics.
|
Magnesium Aluminate (Press-Ready Spinel Powder) Certificate of Analysis |
|
ACT-3B
|
|
Milling
|
|
Spinel Slip Properties
|
Unit
|
Minimum
|
Maximum
|
Target
|
|
PSD |
|
|
|
|
|
D10 |
um
|
NA
|
1.00
|
0.50
|
|
D50 |
um
|
0.5
|
1.50
|
1.00
|
|
D90 |
um
|
1.5
|
4.50
|
2.00
|
|
Press Ready Powder
|
|
Spinel Powder Properties
|
Unit
|
Minimum
|
Maximum
|
Target
|
|
Density |
|
|
|
|
|
Bulk |
g/cc
|
0.82
|
1.00
|
0.88
|
|
Tap |
g/cc
|
0.90
|
1.05
|
0.95
|
|
Pressure to Achieve 2.00 g/cc |
psi
|
N/A
|
25,000
|
17,000
|
|
Fired (2 hrs @ 1625°C) |
g/cc
|
3.50
|
NA
|
3.55
|
|
PTCR Heat Work Temperature |
°C
|
1675
|
|
|
|
PSD of Spray Dried Powder |
|
|
|
|
|
D50 (Screen Analysis) |
um
|
NA
|
200.00
|
<100
|
|
Flowability |
|
|
|
|
|
Flow Rate (2.5 mm 25cc Hall Flowmeter) |
g/sec
|
0.35
|
N/A
|
0.55
|
|
Purity by GDMS on Powder |
|
|
|
|
|
Soda |
ppm
|
-
|
7500
|
<500
|
|
Silica |
ppm
|
-
|
300
|
<150
|
|
Calcia |
ppm
|
-
|
200
|
<150
|
|
Iron Oxide |
ppm
|
-
|
200
|
<150
|
|
Yttria |
ppm
|
-
|
100
|
<50
|
|
Zirconia |
ppm
|
-
|
2000
|
<500
|
|
Others |
ppm
|
-
|
<200
|
<100
|
|
Moisture Content |
|
|
|
|
|
Residual Moisture (120°C for 10 minutes) |
wt%
|
0
|
1
|
0.1
|
|
Loss on Ignition |
|
|
|
|
|
Weight loss at 1625°C |
wt%
|
7.0
|
8.0
|
7.5
|
|
Shrinkage (1.5" disk) |
% OD
|
18.5
|
20
|
19
|
|
Fired (2 hrs @ 1625°C) |
% Height
|
18.5
|
20
|
19
|
|
Phase Composition |
|
|
|
|
|
XRD (Pure Spinel + > 2% MgO) |
pass/fail
|
> 2%
|
2.40%
|
>2
|
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