Ceramics Rolls
ceramics roll
Specifications
Mainly Usage:
1. Heat treatment furnace and toughened furnace
2. Inner liner tube and heating tube in electric furnace
Features:
1.Great mechanical strength
2.High softening temperature
3.Good resistance to thermal impact
4.Small thermal expansion coefficient
5.Good chill and abrupt heat properties
6. Resistance to acid and alkali corrosion
Application:
Electric appliance industry
Automotive industry
Mechanical industry
Engineer 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% |
|
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 1600ºC 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/1600ºC |
|
Breakdown voltage |
20kv/cm |
|
Expansion coefficient |
8*10(-8) |
|
Temperature for use |
Long-term: 1600ºC Short-term: 1800ºC |
|
Chill and abrupt heat |
1500ºC~room temperature not cracking thrice. |
|


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