Pure Tungsten Products Liners / Crucibles Working Temperature 2500℃ Surface Machined

 

Tungsten liners are widely used in industrial vacuum 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 2000℃. Especially for sapphire single crystal growth furnace, tungsten liner 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 Pure Tungsten Liners:

 

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 Liners

 

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 Liners:

 

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