Semi Materials Co., Ltd.

Brazing and glass to metal sealing jigs of graphitelass

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Semi Materials Co., Ltd.
[Korea]

Address
Lojit venture bldg 4F, 22-2 Sunae-Dong, Bundang-Gu,  Sungnam-City Gyeonggi-do
Phone
82-31-7118978
Contact name
Mike. Jung

Description

When producing semiconductor encapsulations, glasswork and brazing connections, graphite jigs are used.
The greatest precision is needed in machining these parts.

The graphites used must exhibit low abrasion, high edge strength and particularly high resistance to oxidation and carbinising.

Glass sealing takes place in either continuous furnaces or in furnaces where graphite jigs are resistance heated.

Requirements
-uniform heat distribution
-specific electrical resistance, adjusted to the local current supply. to ensure correct heating
-high abrasion resistance

Grade recommendation
R6600N, R6600P
for jigs in continuous furnaces
R6650R, R6650N, R6650P
for jigs using direct electrical heating

Physical properties of purity graphite (averages)

Physical Property
R6600
R6650
Density (g/cm3)
1.79
1.85
Porosity(open) (%)
12
10
Hardness Rockwell B (HR)
90
10/150
90
5/100
E-Modulus(N/mm2)
12000
13500
Flexural Strength (N/mm2)
50
65
Compressive Strength (N/mm2)
120
150
Specific Electrical Resistance(mWm)
22
14
Thermal Expansion
(20~1000°C ; x10-6K-1)
4.9
5.0
Thermal Conductivity (W/mK)
55
90
Pressing Method
Isostatic Molded
WG : with grain.
AG : against grain.
If not stated otherwise, all values are measured with a test piece the axis of which is cut with grain.

Typical analysis
Element Concentration
-
code
Ash
Value
Al
B
Ca
Co
Cr
Cu
Fe
K
Mg
Mn
Na
Ni
P
S
Si
Ti
V
High purity
P
20ppm
<0.1
1
1
<0.1
<0.1
0.2
0.5
<1
0.15
<0.1
<1
<0.1
<0.3
<2
<2
0.5
0.2
Normal
purity
N
100ppm
-
Purified
R
500ppm
-


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