Alumina Ceramic Furnace Tube
Zhok can suppy you with alumina ceramic tubes and rods (the tolerances of +/- 0.02mm could be reached by mechanical or electronic finishing or mirror surface finishing) have high hardness, wear resistance, insulation and high temperature resistance. Alumina ceramic tubes are mainly applicable to the material conveying with wear resistant and heavy scouring resistant demands, such as material conveying pipelines for coal-fired power generation, metallurgical and geological industries. Meanwhile they can be used as fuse insulating tube on the electric and electronic appliances. Alumina ceramic rods are used as resistor's ceramic matrix and ceramic top pillar on two-metal thermostat.
Chemical competent Al2O3 ≥ 99.5%
Alkaline matter <0.1%
Density 3.9 g/cm3
Hardness 9 M
Water absorption <0.1%
Ruptures trength >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.
We propose cutting, grinding and thread services, for specific diameter and shapes.
Please contact us for more information.