- Product Details
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Quick Details
-
Elongation (≥ %):
-
Test for reference
-
Place of Origin:
-
Hebei, China
-
Application:
-
Glass sealing
-
Grade:
-
kovar alloy
-
Ni (Min):
-
28.5%
-
Model Number:
-
kovar 4j29
-
Brand Name:
-
CHY
-
Curie point(Tc/ ℃):
-
430
-
Surface:
-
Bright
-
Density:
-
8.2g/cm3
-
Elastic Modulus(E/ Gpa):
-
138
-
Size:
-
Customized Size
-
Material content:
-
Ni-Fe-Co
-
Sample:
-
Avaliable
-
Technique:
-
Cold Drawing
-
Keyword:
-
kovar alloy 4j29 bar
Quick Details
-
Resistance (μΩ.m):
-
0.48
-
Powder Or Not:
-
Not Powder
-
Ultimate Strength (≥ MPa):
-
520
-
Elongation (≥ %):
-
Test for reference
-
Place of Origin:
-
Hebei, China
-
Application:
-
Glass sealing
-
Grade:
-
kovar alloy
-
Ni (Min):
-
28.5%
-
Model Number:
-
kovar 4j29
-
Brand Name:
-
CHY
-
Curie point(Tc/ ℃):
-
430
-
Surface:
-
Bright
-
Density:
-
8.2g/cm3
-
Elastic Modulus(E/ Gpa):
-
138
-
Size:
-
Customized Size
-
Material content:
-
Ni-Fe-Co
-
Sample:
-
Avaliable
-
Technique:
-
Cold Drawing
-
Keyword:
-
kovar alloy 4j29 bar
Product Paramenters
kovar Chemical composition, %
|
Ni
|
28.5~29.5
|
Fe
|
Bal.
|
Co
|
16.8~17.8
|
Si
|
≤0.3
|
|
Mo
|
≤0.2
|
Cu
|
≤0.2
|
Cr
|
≤0.2
|
Mn
|
≤0.5
|
|
C
|
≤0.03
|
P
|
≤0.02
|
S
|
≤0.02
|
|
|
kovar Physical properties
|
Density (g/cm
3
)
|
Resistivity at 20℃(Ωmm
2
/m)
|
Temperature Coefficient of Resistance
（20℃~100℃）X10
-5
/℃
|
Curie point
(Tc/ ℃)
|
Elastic Modulus
(E/ Gpa)
|
|
8.2
|
0.48
|
3.7~3.9
|
430
|
138
|
kovar Tensile strength, MPa
|
Status number
|
State
|
Wire
|
Strip
|
|
R
|
Soft
|
≤585
|
≤570
|
|
1/4I
|
1/4 Hard
|
585~725
|
520~630
|
|
1/2I
|
1/2 Hard
|
655~795
|
590~700
|
|
3/4I
|
3/4 Hard
|
725~860
|
600~770
|
|
I
|
Hard
|
≥850
|
≥700
|
kovar Coefficient of expansion
|
θ/℃
|
α
1
/10
-6
℃
-1
|
θ/℃
|
α
1
/10
-6
℃
-1
|
|
20~60
|
7.8
|
20~500
|
6.2
|
|
20~100
|
6.4
|
20~550
|
7.1
|
|
20~200
|
5.9
|
20~600
|
7.8
|
|
20~300
|
5.3
|
20~700
|
9.2
|
|
20~400
|
5.1
|
20~800
|
10.2
|
|
20~450
|
5.3
|
20~900
|
11.4
|
kovar Thermal conductivity
|
θ/℃
|
100
|
200
|
300
|
400
|
500
|
|
λ/ W/(m*℃)
|
20.6
|
21.5
|
22.7
|
23.7
|
25.4
|
Supply form and specification
|
Type
|
Size
|
|
|
|
Wire
|
D= 0.1~8mm
|
|
|
|
Strip
|
W= 5~250mm
|
T= 0.1mm~2.5mm
|
|
|
Foil
|
W= 10~100mm
|
T= 0.01~0.1mm
|
|
|
Bar
|
Dia= 8~100mm
|
L= 50~1000mm
|
|
|
sheet
|
width=50~900mm
|
Thick=0.1~10mm
|
|
Product Description
kovar
is often called glass sealing alloy in production and processing.
because of its similar expansion coefficient to glass.
After long-term use in aviation factories, the performance is stable. It is mainly used for the glass sealing of electric vacuuglass sealingm components and launch tubes, oscillation tubes, ignition tubes, magnetrons, transistors, sealing plugs, relays, integrated circuits, chassis, housing brackets, etc. In the application, the selected glass should match the expansion coefficient of the alloy. Strictly inspect its low-temperature tissue stability according to the use temperature. Appropriate heat treatment should be carried out during processing to ensure that the material has good deep drawing elongation. When forging materials are used, their air tightness should be strictly inspected.
Heat treatment process
|
Stress relief annealing
|
Heat to 470~540℃, keep for 1~2 h. Cool in the furnace
|
|
annealing
|
Heating to 750~900℃ in vacuum
|
|
Holding time
|
14 min~1h.
|
|
Cooling method
|
Cool down to 200 ℃ at a rate not exceeding 10 ℃/min
|
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