Tungsten Crucible for Sapphire Industry Pure Tungsten Boats

• Application: Aviation, Electronics, Industrial, Medical, Chemical
• Standard: JIS, GB, DIN, BS, ASTM, AISI
• Purity: >99.95%
• Alloy: Non-alloy
• Shape: Customized
• Type: Tungsten Crucibles
• Model NO.: Customized
• Material Grade: W-1
• Usage: for Sapphire Growth
• Working Temperature: 2800 C
• Surface Condition: Machined
• OEM: Available
• Transport Package: Plywood Cases
• Specification: ISO9001: 2000
• Trademark: Fotma
• Origin: China
• HS Code: 9507
• Production Capacity: 300mt/Year

Product Description

Pure Tungsten Boats

Because of the high melting point(3410ºC) of tungsten, tungsten boat is widely used in the industrial furnaces such as sapphire single crystal growth furnace, quartz glass melting furnace, rare earth smelting furnace and other industrial furnaces of which the working temperature is over 2000ºC. Especially for sapphire single crystal growth furnace, tungsten boat with features of high purity, high density, no crack, precise size, smoothy internal and external wall is the key note to seed success rate, crystal quality control, off crystal stick pan and service life in sapphire crystal growth process.
 
During sapphire production, Al2O3 - the compound that is to become the future single crystal - is melted in tungsten crucibles. It is in the Kyropoulos process that our crucibles show their strengths to best effect. They arerepeatedly heated to more than 2 000 °C (3632 °F) and then cooled down again. This process, which would cause fissures and distortions in other materials, is not a problem for our products.  
 
Specifications of Forged Tungsten Boats
 

W purity	Density	Size		Tolerance		Wall thickness	Surface roughness
99.95%	≥19.35g/ cm3	Diameter(mm) 10-500	Height(mm) 10-750	For Dia. +/-5.0	For Height +/-5.0	8-20	Ra=1.6

 
Specifications of Sintered Tungsten Crucibles
 

W purity	Density	Size		Tolerance	Wall thickness	Surface roughness	W purity
99.95%	≥18.5g/ cm3	Diameter(mm) 10-500	Height(mm) 10-750	For Dia. +/-5.0	For Height +/-5.0	8-20	Ra=1.6

 
Surface Finish of Tungsten Boats:
 

Diameter(mm)	Thickness(mm)	Height(mm)	Surface finish	Inner surface finish	Inner bottom finish
30 ~ 50	2 ~ 10	≤500	≤Ra2.0	≤Ra2.4	≤Ra2.8
50 ~ 100	3 ~ 15	≤1000	≤Ra2.0	≤Ra2.4	≤Ra2.8
100 ~ 150	3 ~ 15	≤1000	≤Ra2.0	≤Ra2.4	≤Ra2.8
150 ~ 200	5 ~ 20	≤1000	≤Ra2.0	≤Ra2.4	≤Ra2.8
200 ~ 300	8 ~ 20	≤1000	≤Ra2.0	≤Ra2.4	≤Ra2.8
300 ~ 400	8 ~ 30	≤1000	≤Ra2.0	≤Ra2.4	≤Ra2.8
400 ~ 450	8 ~ 30	≤1000	≤Ra2.0	≤Ra2.4	≤Ra2.8
450 ~ 600	8 ~ 30	≤1000	≤Ra2.0	≤Ra2.4	≤Ra2.8

 
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