Spinel Ceramic - Magnesium Aluminate
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Magnesium Aluminate (Press-Ready Spinel Powder) Certificate of Analysis
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Press Ready Powder
| Milling Properties |
ACT-3B |
ACT-3PF |
ACT-5B |
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| Spinel Slip Properties |
Unit |
Minimum |
Maximum |
Target |
Minimum |
Maximum |
Target |
Minimum |
Maximum |
Target |
| PSD | ||||||||||
| D10 | um |
0.15 |
1.00 |
0.50 |
0.15 | 1.00 | 0.50 | 0.15 | 1.00 | 0.50 |
| D50 | um | 0.70 | 1.20 | 0.95 | 0.70 | 1.20 | 0.95 | 0.70 | 1.20 | 0.95 |
| D90 | um |
1.50 |
4.50 |
2.00 |
1.50 | 4.50 | 2.00 | 1.50 | 4.50 | 2.00 |
| Milling Properties |
ACT-3B |
ACT-3PF |
ACT-5B |
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| Spinel Powder Properties |
Unit | Minimum | Maximum | Target | Minimum | Maximum | Target | Minimum | Maximum | Target |
| Density | ||||||||||
| Bulk | g/cc |
0.80 | 1.00 | 0.90 | 0.77 | 0.97 | 0.87 | 0.80 | 1.00 | 0.90 |
| Tap | g/cc |
0.90 | 1.10 | 1.00 | 0.88 | 1.08 | 0.98 | 0.90 | 1.10 | 1.00 |
| Pressure to Achieve 2.00 g/cc | psi | N/A | 30000 | 17000 | N/A | 30000 | 22000 | N/A | 30000 | 17000 |
| Green Strength | psi | 22.0 | N/A | 30.0 | 23.0 | N/A | 35.0 | 22.0 | N/A | 30.0 |
| Fired (2 hrs @ 1625°C) |
g/cc |
3.51 | NA | 3.55 | 3.41 | NA | 3.45 | 3.51 | NA | 3.55 |
| PTCR Heat Work Temperature |
°C |
1675 | 1675 | 1675 | ||||||
| PSD of Spray Dried Powder (Sieve Analysis) |
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| + No. 60 Sieve (+ 250 um) |
% | N/A | 10.0 | 5.0 | N/A | 10.0 | 5.0 | N/A | 10.0 | 5.0 |
| + No. 100 Sieve (-250 um and + 149 um) |
% | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| + No. 140 Sieve (-149 um and + 105 um) |
% | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| + No. 200 Sieve (-105 um and + 74 um) |
% | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| - No. 200 Sieve (-74 um) |
% | N/A | 15.0 | 5.0 | N/A | 15.0 | 5.0 | N/A | 15.0 | 5.0 |
| Flowability | ||||||||||
| Flow Rate (2.5 mm 25cc Hall Flowmeter) |
g/sec |
0.45 | N/A | 0.55 | 0.45 | N/A | 0.55 | 0.45 | N/A | 0.55 |
| Purity by GDMS on Powder |
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| Soda | ppm |
- | 7500 | <4000 | - | 7500 | <4000 | - | 7500 | <4000 |
| Silica | ppm |
- | 300 | <150 | - | 300 | <150 | - | 1000 | <500 |
| Calcia | ppm |
- | 200 | <150 | - | 200 | <150 | - | 1000 | <500 |
| Iron Oxide | ppm |
- | 300 | <150 | - | 300 | <150 | - | 1000 | <500 |
| Yttria | ppm |
- | 300 | <150 | - | 300 | <150 | - | 1000 | <500 |
| Zirconia | ppm |
- | 3000 | <2500 | - | 3000 | <2500 | - | 3000 | <2500 |
| Others | ppm |
- | <200 | <100 | - | <200 | <100 | - | <1000 | <100 |
| Moisture Content |
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| Residual Moisture (120°C for 10 minutes) |
wt% |
0.20 | 1.30 | 0.45 | 0.20 | 1.30 | 0.45 | 0.20 | 1.30 | 0.45 |
| Loss on Ignition | ||||||||||
| Weight loss at 1625°C |
wt% |
7.3 | 8.3 | 7.8 | 9.0 | 11.0 | 7.8 | 7.0 | 9.0 | 7.8 |
| Shrinkage (1.5" disk) |
% OD |
18.5 | 20.0 | 19.0 | 18.5 | 20.0 | 19.0 | 18.5 | 20.0 | 19.0 |
| Fired (2 hrs @ 1625°C) |
% Height |
18.0 | 20.0 | 19.0 | 18.0 | 20.0 | 19.0 | 18.0 | 20.0 | 19.0 |
| Phase Composition |
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| XRD (Pure Spinel + > 2% MgO) |
pass/fail |
> 2% | 2.40% | >2 | > 2% | 2.40% | >2 | > 2% | 2.40% | >2 |
