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{"title":"2.0mm Bright Surface Precision Alloys , Low Expansion Alloys For Sealing Glass","imgUrl":"https:\/\/img.chinax.com\/nimg\/aa\/63\/67db9d18ff5d981c5ca9fb0a6db3-200x200-1\/2_0mm_bright_surface_precision_alloys_2c_low_expansion_alloys_for_sealing_glass.jpg","attrs":{"Brand Name":"OHMALLOY","Model Number":"4J29","Certification":"SGS, ISO","Place of Origin":"China(Shanghai)"}}
{"title":"Bright Surface Fe Ni Precision Alloys With Wooden Case \/ Spool Package","imgUrl":"https:\/\/img.chinax.com\/nimg\/e0\/3b\/7601a81b339f81c9f2ab8e64ec5c-200x200-1\/bright_surface_fe_ni_precision_alloys_with_wooden_case_2f_spool_package.jpg","attrs":{"Brand Name":"OHMALLOY","Model Number":"4J29","Certification":"SGS, ISO","Place of Origin":"China(Shanghai)"}}
{"title":"Vacuum Furnace Nickel Based Alloys For Glass - To - Metal Seal Vacuum Switch","imgUrl":"https:\/\/img.chinax.com\/nimg\/25\/fb\/09e8480230d1fad36bdaefae91db-200x200-1\/vacuum_furnace_nickel_based_alloys_for_glass_to_metal_seal_vacuum_switch_tube.jpg","attrs":{"Brand Name":"OHMALLOY","Model Number":"4J29","Certification":"SGS, ISO","Place of Origin":"China(Shanghai)"}}
{"title":"Glass Sealing Precision Alloys Kovar Alloy 4J29 With Ceramic Wire \/ Rod \/ Strip","imgUrl":"https:\/\/img.chinax.com\/nimg\/aa\/63\/67db9d18ff5d981c5ca9fb0a6db3-200x200-1\/glass_sealing_precision_alloys_kovar_alloy_4j29_with_ceramic_wire_2f_rod_2f_strip.jpg","attrs":{"Brand Name":"OHMALLOY","Model Number":"4J29","Certification":"SGS, ISO","Place of Origin":"China(Shanghai)"}}
{"title":"Customize Jumper Resistor \/ Extension Compression Spring For Computer , Car","imgUrl":"https:\/\/img.chinax.com\/nimg\/2b\/b1\/8a8f0bc67f32e94b8416082164be-200x200-1\/customize_jumper_resistor_2f_extension_compression_spring_for_computer_2c_car.jpg","attrs":{"Brand Name":"OHMALLOY","Model Number":"jumper resistor","Certification":"ISO9001-2008","Place of Origin":"China(Shanghai\uff09"}}
Kovar is a nominal 29%Ni-17%Co-54%Fe alloy that is a well-known glass-sealing alloy suitable for sealing to hard glasses. Kovar has a nominal expansion coefficient of approximately 5 ppm/°C and inflection temperature of ~450 °C (840 °F).
Kovar (ASTM F15) has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials. This alloy has found wide application in power tubes, microwave tubes, transistors, and diodes. In integrated circuits, it has been used for the flat pack and the dual-in-line package.
Chemical Composition
Grade
C%
P%
S%
Mn%
Si%
Cu%
Cr%
Mo%
Ni%
Co%
Fe%
Kovar
Max 0.03
Max 0.020
Max 0.020
Max 0.50
Max 0.30
Max 0.20
Max 0.20
Max 0.20
28.5-29.5
16.8-17.8
Bal.
Specifications
Grade
UNS
Werkstoff Nr.
ASTM
Kovar
K94610
1.3981
F15
Physical Properties
Grade
Density
Melting Point
Kovar
8.17 g/cm3
1449°C
Mechanical Properties
Grade
Tensile Strength N/mm²
Soft
1/4 Hard
1/2 Hard
3/4 Hard
Full Hard
Kovar Strip
<570
520-630
590-700
600-770
>700
Kovar Wire
<585
585-725
655-795
725-860
>860
Coefficient of Expansion
Alloy
Linear Coefficient of Thermal Expansion ā,10-6/℃
20-200℃
20-300℃
20-400℃
20-450℃
20-500℃
20-600℃
20-700℃
20-800℃
Kovar
5.9
5.3
5.1
5.3
6.2
7.8
9.2
10.2
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter,Trading Company
Year Established:
2008
Total Annual:
4000000-6000000
Employee Number:
20~50
Ecer Certification:
Verified Supplier
Ohmalloy Material Co.,Ltd is a high-tech enterprise which specialized in making all kinds of alloy such as high resistance alloy, low-resistance copper nickel alloy, precision alloy, FeCrAl alloy and thermocouple Alloy.
Ohmalloy Material Co.,Ltd have a full production line from melting, surface... Ohmalloy Material Co.,Ltd is a high-tech enterprise which specialized in making all kinds of alloy such as high resistance alloy, low-resistance copper nickel alloy, precision alloy, FeCrAl alloy and thermocouple Alloy.
Ohmalloy Material Co.,Ltd have a full production line from melting, surface...