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Coarse grain tubes
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Pressed or Cast Zirconium Oxide Compositions Engineered for High Temperature Cycling Environments
Calcia, Yttria or Magnesia stabilized coarse grain tubes are manufactured in various grain sizes, mass and shapes to satisfy your specific application and deliver long-term service. Markets served include: non-reactive firing of electronic components and crystal growing.
Composition 1651
Tubes made of composition 1651 are typically used for high temperature induction heated crystal growing furnaces. 1651 is composed of zirconia, stabilized with 3.5% calcia by weight. These tubes will survive repeated cycling from room temperature to 2000°C (3632°F), when used with Zircoa backup material. Please contact us to discuss your specific needs.
Specifications
Standard Sizes of Coarse Grain Tubes
| Dimensions | |||
|---|---|---|---|
| OD | ID | ||
| mm | inches | mm | inches |
| 38.1 | 1.50 | 25.4 | 1.00 |
| 38.1 | 1.50 | 12.7 | 0.50 |
| 50.8 | 2.00 | 38.1 | 1.50 |
| 50.8 | 2.00 | 31.7 | 1.25 |
| 50.8 | 2.00 | 25.4 | 1.00 |
| 63.5 | 2.50 | 50.8 | 2.00 |
| 63.5 | 2.50 | 44.4 | 1.75 |
| 63.5 | 2.50 | 38.1 | 1.50 |
| 69.8 | 2.75 | 57.1 | 2.25 |
| 76.2 | 3.00 | 63.5 | 2.50 |
| 76.2 | 3.00 | 50.8 | 2.00 |
| 88.9 | 3.50 | 76.2 | 3.00 |
| 88.9 | 3.50 | 63.5 | 2.50 |
| 92.2 | 3.63 | 79.5 | 3.13 |
| 101.6 | 4.00 | 88.9 | 3.50 |
| 101.6 | 4.00 | 76.2 | 3.00 |
| 114.3 | 4.50 | 101.6 | 4.00 |
| (MORE) | |||
| (CONTINUED) | |||
| Dimensions | |||
| OD | ID | ||
| mm | inches | mm | inches |
| 127.0 | 5.00 | 114.3 | 4.50 |
| 127.0 | 5.00 | 101.6 | 4.00 |
| 152.4 | 6.00 | 139.7 | 5.50 |
| 152.4 | 6.00 | 127.0 | 5.00 |
| 177.8 | 7.00 | 152.4 | 6.00 |
| 190.5 | 7.50 | 171.4 | 6.75 |
| 222.2 | 8.75 | 196.8 | 7.75 |
Physical Properties of Various Zirconia Compositions
| Composition | 1968 | 1651 | 872 | 871 | 890 | 2290 | 3004 |
|---|---|---|---|---|---|---|---|
| Stabilizer | CaO (a) |
CaO (a) |
CaO (a) |
CaO (a) |
Y2O3 (b) |
Y2O3 (b) |
MgO (c) |
| Bulk Density (g/cm3) | 3.3 | 4.2 | 4.1 | 3 | 4 | 4.5 | 4.6 |
| Porosity (%) | 35 | 25 | 30 | 40 | 29 | 23 | 16 |
| Modulus of Rupture (psi) | 450 | 2,400 | 1,100 | 800 | 1300 | 2400 | 3500 |
| Coefficient of Thermal Expansion RT-1300°C (in/in/°C) |
8.2 | 7.3 | 8 | 7.9 | 9.4 | 5.9 | 2.3 |
| Thermal Conductivity (W/m-°K) 800°C | 0.68 | 1.2 | 1.2 | 0.52 | 1 | 1.2 | 1.4 |
a. calcia b. yttria c. magnesia
Refractory Backup (Thermal Insulation)
Extend the life of your furnace, and maintain tighter control over your furnace temperatures with Zircoa’s pre-sintered grog refractory backup (www.zircoa.com/grog).
- Zircoa Backup 1859 — Partially stabilized with magnesia and calcia. Available in -8+100 Tyler mesh size.
- Zircoa Backup 3001 — Partially stabilized with magnesia. Available in -8+28 Tyler mesh size.
- Zircoa Backup 10B – Calcia stabilized bubble zirconia. Available in -10+30 Tyler mesh size.