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Ceramic Roller

Specifications

  • High temperature industrial alumina ceramic rolle
  • Material:Al2O3 ceramic
  • Working temperature:1600C.
  • Good chemical resistant
  • High temperature industrial alumina ceramic roller
  • Material: Alumina ceramic

Main 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

Available Sizes

Material

65 Al2o3

75 Al2o3

80 Al2o3

85 Al2o3

90 Al2o3

95 Al2o3

99 Al2o3

Al2o3

65%

75%

80%

85%

90%

93%

99.3%

Fe2o3

≤ 4

≤ 2

≤ 1.5

≤ 1.0

≤ 0.5

≤ 0.5

≤ 0.3

Desnsity: g / cm3

2.8

3.10

3.20

3.40

3.50

3.60

3.85

Vickers Hardness

7.5

≤ 7.8

≥ 8

≥ 8.6

≥ 8.8

9

9

Water Absorption:%

≤ 4

≤ 1

≤ 0.5

≤ 0.2

≤ 0.1

≤ 0.085

≤ 0.01

Refractoriness:°C

1300 °C

1400 °C

1450 °C

1580 °C

1600 °C

1650 °C

1800°C

Flexural Strength:Mpa

80

100

150

180

200

240

280

Wear Rate( at room

temperature, erosion,

100 grinding)%

≤ 5

≤ 4.5

≤ 3.5

≤ 3

≤ 2.5

≤ 1

≤ 0.5

Main Specification

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.