Specifications

Alumina Ceramic Tubes
1. Heat treatment furnace and toughened furnace
2. Inner liner tube and heating tube in electric furna

 

 

 

High Purity Alumina Ceramic Tube are widely used in thermocouple protections and some are used in furnaces. We could design both open for two ends, and one open, the other closed. Also we could make with 2 or 4 holes in the tube. The size ranges from 3mm to 100mm for O.D., and the length is from 10mm to 3000mm. We can also design upon the customers' detailed requirements.

 Features:

1.Extreme high temperature stability under reducing, inert and high vacuum condition under high   temperature up to 1800C.

2.Extreme wear and abrasion resistance.

3.Chemical corrosion resistance under high temperature.

4.High dielectric properties.

5.Gas tight for many applications to provide protective atmospheres or high vacuum at high temperature to eliminate contamination or impurity.

We mainly produce alumina tubes, rods and various industrial ceramic parts, which are mainly used in thermalcouple temperature, liquid steel continous temperature, various industrial furnace(containing vacuum furnace, carburizing furnace, wire furnace, atmosphere furnace etc), especially widely used in petrochemical, spinning, electric, instrumentation, mechanical workout, military project etc industry.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Chemical competent	Al2O3	≥99.5%
	SiO2	<0.2%
	Fe2O3	<0.1%
Alkaline matter		<0.1%
Density		3.9 g/cm3
Hardness		9 M
Water absorption		<0.1%
Rupture  strength		>2000kg/cm2
Gas tightness		Kept for ten minutes at negative pressure of 1.3Kpa. The pressure drop is less than 0.3Kpa.
Thermal tolerance		Insert the pipe into the furnace at a depth of 20mm. Heat to 1600C and maintain for 30 minutes.
Alkali tolerance		In the Na2CO3 solution of 2N concentration, boil for 15 hours with the weight loss not greater than 20mg/dm2.
Volume resistance		>9*10(5) Ω·cm/1600C
Breakdown voltage		20kv/cm
Expansion coefficient		8*10(-8)
Temperature for use		Long-term: 1600C  Short-term: 1800C
Chill and abrupt heat		1500C~room temperature not cracking thrice.
OD	25~30	31~40	41~50	51~60	61~70	71~80	81~90	91~100
ID	19~23	24~32	33~40	41~50	51~60	61~70	71~80	81~90
L	200~1600