Product details
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 bending radius 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
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, linearity, diameter, ovality
3 Check 3 Surface quality
4 Kink or pressing Bending machine 1 Measurements (length, width)
5 Calibration Calibration mould 2 Arc radius
6 Check 3 Surface quality
7 Wire cutting Wire cutting machine 1 Surface quality
8 Clean 2 Tolerance of measurement, arc radius according to
9 Check tolerance stated on drawing
10 Package 3 Show certificate of quality
Ⅳ、Application
Tungsten heater components, as heat source in the sapphire growth furnace, have decisive effect for Al2O3 melt to form turbulence and produce radial temperature gradient. Therefore, high-purity and high-density tungsten heater components with delicate manufacture and reasonable design have great significance towards quality control of sapphire crystal, energy saving and service life.
