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1.Tungsten/ W/ Wolfram heater
Ⅰ、Physical and chemical properties
1 Tungsten heater
1.1 Purity：W≥99.95%；
1.2 Density：≥19.1g/cm3；
1.3 Application temperature environment：≤2300℃；
2 Copper base
2.1 Purity：Cu≥99.95%；
2.2 Density：≥8.8g/cm3；
2.3 Application temperature environment：≤1000℃；
Ⅱ、Measurements and tolerances
Unit：mm
|
Tungsten heater |
||||||
|
Diameter |
Diameter tolerance |
Width |
Width tolerance |
Height |
Height tolerance |
Remark |
|
3.0 |
±0.1 |
≤650 |
±1 |
≤1200 |
±1 |
Shape of bottom and design of bendingradius will be Manufactured according to customers’ requirements |
|
4.0 |
±0.1 |
≤600 |
±1 |
≤1150 |
±1 |
|
|
5.0 |
±0.1 |
≤550 |
±1 |
≤1100 |
±1 |
|
|
6.0 |
±0.2 |
≤550 |
±1 |
≤1050 |
±1 |
|
|
7.0 |
±0.2 |
≤500 |
±1 |
≤1000 |
±1 |
|
|
8.0 |
±0.2 |
≤500 |
±1 |
≤950 |
±1 |
|
|
9.0 |
±0.2 |
≤450 |
±1 |
≤900 |
±1 |
|
|
Copper base will be Manufactured according to customers’ requirements and processed with CNC lathe |
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Ⅲ、 Manufacture process and equipment
|
Tungsten heater |
Item |
Process |
Equipment |
Quality check point |
|
1 |
Tungsten rod |
|
1. Physical and chemical properties |
|
|
2 |
Clean |
|
2. Length, straightness, diameter and circularity |
|
|
3 |
Check |
|
3. Surface quality |
|
|
4 |
Bend |
Bending machine |
1. Length and width dimensions |
|
|
5 |
Regulate |
Correct mold |
2. Arc diameter |
|
|
6 |
Check |
|
3. Surface quality |
|
|
7 |
Wire cutting |
Wire cutting machine |
1. Surface quality |
|
|
8 |
Clean |
|
2. Dimensions, arc diameter, and tolerances |
|
|
9 |
Check |
|
3. Issue certificate of quality |
|
|
10 |
Pack |
|
|
Ⅳ、Application
As the heating source in the sapphire growth furnace, tungsten heater will have decisive effect on the formation of
temperature gradient for AL2O3.In this way, high purity, high density, reasonable design and excellent fabrication
of the tungsten heater will have have important significance on the quality control of sapphire ingots, saving of
energy and extension of working life.
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