High temperature furnace alumina ceramic pipe
Material: Alumina ceramic
Material: Alumina ceramic
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
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Chemical competent
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Al2O3
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≥99.5%
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SiO2
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<0.2%
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Fe2O3
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<0.1%
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Alkaline matter
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<0.1%
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Density
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3.9 g/cm3
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Hardness
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9 M
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Water absorption
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<0.1%
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Ruptures trength
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>2000kg/cm2
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Gas tightness
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Kept for ten minutes at negative pressure of 1.3Kpa.
The pressure drop is less than 0.3Kpa.
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Thermal tolerance
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Insert the pipe into the furnace at a depth of 20mm.
Heat to 1600ºC and maintain for 30 minutes.
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Alkali tolerance
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In the Na2CO3 solution of 2N concentration, boil for
15 hours with the weight loss not greater than 20mg/dm2.
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Volume resistance
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>9*10(5) Ω·cm/1600ºC
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Breakdown voltage
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20kv/cm
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Expansion coefficient
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8*10(-8)
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Temperature for use
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Long-term: 1600ºC Short-term: 1800ºC
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Chill and abrupt heat
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1500ºC~room temperature not cracking thrice.
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Material
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65 Al2o3
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75 Al2o3
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80 Al2o3
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85 Al2o3
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90 Al2o3
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95 Al2o3
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99 Al2o3
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Al2o3
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65%
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75%
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80%
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85%
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90%
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93%
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99.3%
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Fe2o3
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≤ 4
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≤ 2
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≤ 1.5
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≤ 1.0
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≤ 0.5
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≤ 0.5
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≤ 0.3
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Desnsity: g / cm3
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2.8
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3.10
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3.20
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3.40
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3.50
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3.60
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3.85
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Vickers Hardness
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7.5
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≤ 7.8
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≥ 8
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≥ 8.6
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≥ 8.8
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9
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9
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Water Absorption:%
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≤ 4
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≤ 1
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≤ 0.5
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≤ 0.2
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≤ 0.1
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≤ 0.085
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≤ 0.01
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Refractoriness:°C
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1300 °C
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1400 °C
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1450 °C
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1580 °C
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1600 °C
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1650 °C
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1800°C
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Flexural Strength:Mpa
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80
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100
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150
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180
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200
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240
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280
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Wear Rate( at room
temperature, erosion,
100 grinding)%
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≤ 5
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≤ 4.5
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≤ 3.5
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≤ 3
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≤ 2.5
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≤ 1
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≤ 0.5
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