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Alumina Performance Report
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Projects
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Units
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Index
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Purity
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% Al
2
O
3
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95
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99.5
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99.95
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Appearance
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-
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white
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ivory
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ivory
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Crystal Size(average)
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μm
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3~10
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4~6
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2~3
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Density
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g/cm
3
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≥3.74
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≥3.90
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≥3.92
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Physical
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Flexural Strength(20℃)
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3-Point Bend
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Mpa
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380
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400
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460
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Hardness
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HV
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1500
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1700
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2800
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Fracture Toughness
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Mpa*m
1/2
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3~4
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4~4.5
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1.8-2.8
(4~5) |
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Reflectivity
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%
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≥94
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-
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-
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water Absorption
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%
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0
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0
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0
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Thermal |
Thermal Conductivity
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25℃
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Coefficient Thermal Expansion
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25-500℃
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1*10
6
mm/C
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6.6~7.5
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25-800℃
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6.6~7.9
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Thermal Shock Resistance(OT)'C
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850-880℃
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Degree
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≥5
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≥5
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≥5
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Specific Heat
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J/(kg*K)
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780
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800
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-
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Electricity |
Dielectric Constant
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1MHz/25℃
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9.4±0.3
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9.6±0.3
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9.7±0.3
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Dielectric Loss
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1MHz/25℃
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×10
-4
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≤3
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≤1
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≤1
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Volume Resistivity |
25℃
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Ω*cm
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＞10
14
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＞10
14
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＞10
14
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300℃
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＞10
11
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＞10
10
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＞10
11
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500℃
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＞10
9
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＞10
8
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＞10
8
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Dielectric Strength
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KV/mm
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＞12
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＞12
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＞12
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Note: The above parameters are reference values and will change with the content of each component.
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