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Upper and bottom cover plate
Ⅰ、 Physical and chemical properties
1 Purity：Mo≥99.95%；
W ≥99.95%；
2 Density：Mo≥10.1g/cm3 ；
W ≥19.0g/cm3；
3 Application temperature environment：≤2300℃；
Ⅱ、 Measurements and tolerances
Unit：mm
|
Thickness |
Max diameter |
|
2.0±0.1 |
660±0.2 |
|
1.0±0.08 |
660±0.2 |
|
0.5±0.04 |
660±0.2 |
|
0.3±0.03 |
660±0.2 |
Special sizes can be manufactured based on customers' requirements
Ⅲ 、Manufacture process and equipment
| Molybdenum reflection shield | Item | Process | Equipment | Quality check point |
| 1 | Molybdenum sheet or tungsten sheet | 1. Physical and chemical properties 2. Measurements (length, width, thickness) 3. Surface quality | ||
| 2 | Check | |||
| 3 | Wire cutting | Wire cutting machine | 1. Surface cleaness | |
| 4 | Machine | NC milling machine, bench drill, lathe | 2. Tolerances on the drawings | |
| 5 | Clean | 3. No peeling and crack | ||
| 6 | Check | |||
| 7 | Assembly | Assembly platform | 1. Surface cleaness | |
| 8 | Clean | 2. Assembly stability | ||
| 9 | Check | 3. Assembly tolerances | ||
| 10 | Pack | 4. Issue certificate of quality |
Ⅳ、Application
As the heat shield parts in the sapphire growth furnace, molybdenum heat shield, molybdenum upper cover and bottom cover have the key influence on the heat reflection.High purity, accurate dimenisons, smooth surface, easy assembly, and reasonable design of the molybenum heat insulator will be very important for the sapphire ingot quality.
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