|
99.6% Alumina
Products
|
|
Alumina
(Al2O3) has a wide application due to its
versatility and low material cost.
Alumina possesses high
melting point, strong hardness, and good chemical stability,
making it a good material to withstand high temperature and
chemical corrosion.
|
|
Chemical
Composition (%)
|
Al2O3
|
>99.6
|
|
SiO2
|
<0.1
|
|
Fe2O3
|
<0.05
|
|
R2O
|
<0.1
|
|
Density
(g/cm3)
|
>3.80
|
|
Apparent
Porosity (%)
|
<0.5
|
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Hardness
(HRA)
|
88
|
|
Bending
Strength (Mpa)
|
>350
|
|
Compressive
Strength(Mpa)
|
>12000
|
|
Dielectric
Properties
|
(20°K
and 1 MHZ)
|
|
Constant
|
9.5
|
|
Loss Factor
|
2*10-4
|
|
Max
Service Temperature (°C)
(°F)
|
1800
3272 |
96% Alumina Substrates Material Properties
|
Charateristic
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Test Condition
|
Unit
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Fine
|
Qualify
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Test Method
|
|
Color
|
|
|
White and dense
|
White and dense
|
Q/GTT002
|
|
Average Grain Size
|
|
μm
|
3-5
|
3-5
|
Q/GTT002
|
|
Density
|
|
g/cm3
|
≥3.74
|
≥3.70
|
GB2413-81
|
|
Water Absorption
|
|
%
|
0
|
0
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GB/T3299-1996
|
|
Hardness
|
Load 4.9
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GPa
|
≥15
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≥15
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GB3297-82
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Flexural Strength
|
Crooked distance 80mm
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MPa
|
≥320
|
≥300
|
Q/GTT002
|
|
Coefficient of Linear Thermal Expansion
|
20-500°C
|
1 × 10-6 mm/°C
|
6.5-7.5
|
6.5-7.5
|
GB5594.3
|
|
20-800°C
|
6.5-8.0
|
6.5-8.0
|
|
Thermal Conductivity
|
20°C
|
W/(m.K)
|
≥24
|
≥20
|
Q/GTT002
|
|
Dielectric Strength
|
|
KV/mm
|
≥12
|
≥12
|
GB5593
|
|
Volume Resistivity
|
20°C
|
Ω.cm
|
≥1014
|
≥1014
|
Q/GTT002
|
|
300°C
|
≥1011
|
≥1011
|
|
500°C
|
≥109
|
≥109
|
|
Dielectric Constant
|
1MHz
|
|
9.3-10.6
|
9.3-10.6
|
Q/GTT002
|
|
Dielectric Loss
|
1MHz
|
|
3 × 10-4
|
3 × 10-4
|
Q/GTT002
|
|
Thermal Shock Resistance
|
850°C
|
time
|
≥7
|
≥5
|
Q/GTT002
|
|
Surface Roughness
|
Ra (λ2)
|
μm
|
0.20-0.75
|
0.2-0.75
|
Q/GTT002
|
|
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|
Zirconia
Products
|
|
Zirconia (ZrO2)
can withstand the high temperature up to 2200oC and
has very good resistance to thermal shock and chemical erosions.
It is an ideal material for the melting of precious metals and
super-alloys.
|
|
Chemical
Composition (%)
|
ZrO2
|
>95
|
|
SiO2
|
<0.01
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|
Fe2O3
|
<0.01
|
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Na2O
|
<0.005
|
|
CaO2
|
4.0+1
|
|
Cl-
|
<0.02
|
|
Density
(g/cm3)
|
6.01
|
|
Compressive
Strength (Mpa)
|
2600
|
|
Flexural
Strength (Mpa)
|
900
|
|
T.C.E.
(RT to 400°C)
|
11.4*10-6/K
|
|
Thermal
Conductivity (w/m)
|
2
|
|
Max Service Temperature
(°C)
(°F)
|
2200
3992
|
|
|
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|
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Fused
Quartz
Products
|
|
Fused quartz is made
from the melting and refusing of crushed natural crystalline
quartz. The low
coefficient of thermal expansion of quartz provides excellent
stability and resistance to thermal shock over large temperature
excursions and wide thermal operating range.
|
Chemical Impurity Data Sheet (ppm)
|
Element
|
Gas-melt Transparent
|
Arc-melt Non-transparent
|
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Al
|
10~30
|
200~500
|
|
Fe
|
0.4~1
|
7~80
|
|
Ca
|
0.18~2
|
30
|
|
Mg
|
<1
|
--
|
|
Ti
|
1.4
|
10~160
|
|
Pb
|
<0.1
|
--
|
|
Mn
|
0.024
|
--
|
|
Ni
|
0.1
|
--
|
|
Co
|
∆
|
--
|
|
Cu
|
0.012
|
0.4
|
|
K
|
<2
|
--
|
|
Na
|
<2
|
30
|
|
Li
|
<0.2
|
--
|
|
B
|
<0.3
|
--
|
-- Not
Test ∆ Unable to Test
|
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Density
|
2.2×103kg/m3
|
|
Hardness
|
5.5-6.5 Mohs Scale
570KHN100
|
|
Design
Compressive Strength
|
Greater
than 1.1×109Pa
|
|
Coefficient
of Thermal Expansion
|
5.4×10-7(0°C
~100°C)
|
|
Thermal
Conductivity (20°C)
|
1.4W/m
°K
|
|
Specific
Heat (20°C)
|
670J/kg
°K
|
|
Softening
Point
|
1730°C,
lgη7.6
|
|
Annealing
Point
|
1180°C,
lgη13
|
|
Strain
Point
|
1075°C,
lgη14.5
|
|
Dielectric
Properties
|
(20°K
and 1MHZ)
|
|
Constant
|
3.75
|
|
Loss Factor
|
Less
than 4×10-4
|
|
Max Service Temperature
|
1200°C (2192°F)
|
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|
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