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CERAMICS
Alumina
GENERAL
PROPERTIES
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Specific
Gravity:
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3.90
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Crystal
Size:
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Range
2-50 Micron, Avg 15-30
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Surface
Finish, As Fired:
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26
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Surface
Finish, Ground:
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17
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Water
Absorption:
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None
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Permeability:
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Gas
Tight
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Flexural
Strength, Typical 25 oC:
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331
MPa (48 kpsi)
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Flexural
Strength, Typical 1000 oC:
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193
MPa (28 kpsi)
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Compressive
Strength:
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2071
MPa (>300 kpsi)
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Modulus
of Elasticity Typical 25 oC:
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345
GPa (50 x 106
psi)
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Color:
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Ivory
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Specific
Heat @ 100 oC:
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880
J/Kg-oK,
0.21 Cal/g/oC
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Maximum
Temperature
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(for
no load conditions):
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1750
oC,
3180 oF
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Thermal
Conductivity, 25 oC:
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29.4
W/mK
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Thermal
Conductivity, 100 oC:
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23.0
W/mK
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Thermal
Coefficient of Expansion:
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25 - 200 oC:
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6.7
x 10-6/oC
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25 - 500 oC:
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7.3
x 10-6/oC
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25 - 800 oC:
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7.8
x 10-6/oC
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25 - 1000 oC:
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8.0
x 10-6/oC
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Dielectric
Strength:
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6.35 mm:
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8.7
kv/mm
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3.18 mm:
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11.6
kv/mm
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Spec. 1.27 mm:
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16.5
kv/mm
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AVAILABLE
SIZES
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Tubing
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Rod
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Outside
Diameter
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Inside
Diameter
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Diameter
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.250”
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.156”
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.020”
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.250”
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.188”
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.029”
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.375”
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.250”
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.040”
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.500”
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.250”
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.048”
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.500”
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.375”
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.060”
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.625”
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.500”
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.080”
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.750”
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.563”
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.125”
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.750”
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.500”
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.250”
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.875”
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.625”
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.375”
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1.000”
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.750”
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.500”
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1.125”
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.875”
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.625”
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1.250”
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.875”
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.625”
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1.375”
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1.125”
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1.00”
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1.500”
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1.250”
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-
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1.625”
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1.375”
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-
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1.750”
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1.500”
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-
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1.875”
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1.625”
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-
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2.000”
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1.750”
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-
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2.125”
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1.875”
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-
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2.250”
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2.000”
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-
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2.375”
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2.125”
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-
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2.500”
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2.250”
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-
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2.750”
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2.375”
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-
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2.750”
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2.500”
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-
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3.000”
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2.750”
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-
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3.250”
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2.875”
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-
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3.500”
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3.125”
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-
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3.500”
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3.250”
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-
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3.750”
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3.375”
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-
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4.000”
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3.625”
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-
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4.250”
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3.875”
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-
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4.500”
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4.125”
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-
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4.750”
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4.375”
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-
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5.000”
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4.625”
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-
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5.250”
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4.875”
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-
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5.500”
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5.125”
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-
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Boron Nitride
GENERAL
PROPERTIES
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Compressive
Strength 25 oC
(ACMA-1) lg/in2:
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15
x 10.3
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Modulus
of Elasticity 25 oC
(sonic):
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11.4
x 10.6
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Modulus
of Rupture lb/in2
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@ 25 oC:
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6350
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@ 1000 oC:
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6760
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@ 1350 oC:
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3495
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Density
(ASTM C20), g/cm2:
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1.90
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Hardness:
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205
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Water
absorption, % weight gain:
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% weight gain in 168 hours @ 25oC
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and 80%-100% relative humidity:
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0.16
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Thermal
Expansion Degrees (C-1
x
10-6):
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75oC - 5000C:
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0.0
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75oC - 1000oC:
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0.0
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75oC - 1500oC:
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0.09
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75oC - 2000oC:
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1.30
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Thermal
Conductivity, (W/moC):
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@ 100oC:
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39.7
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@ 350oC:
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31.2
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@ 700oC:
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28.8
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Maximum
Use Temperature in
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Inert or reducing atmosphere (oC):
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2000
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Oxidizing Atmosphere (oC):
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1200
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AVAILABLE
SIZES
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Rods
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.250”
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.375”
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.500”
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.750”
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.875”
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1.00”
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1.25”
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1.50”
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2.00”
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Other
sizes available upon request.
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Last updated:
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Copyright 2002 | ESPICorp Inc.
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