Kovar(4J29) studs is a metal rod or bar with threads on both sides. It also known as double-headed screws or studs, used to connect two parts together. General for mining machinery, bridges, cars, motorcycles, boiler steel structure, hanging tower, large span steel structure and large buildings.
We tend to use studs when the parts need to remove frequently, because the thread will be worn if install and remove often, then we need to change the studs.
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).
4J29 Application and special requirements:
The alloy is a typical international common Fe-Ni-Co hard glass sealing alloy. Long-term use of aviation factory, stable performance. Mainly used for electric vacuum components such as the launch tube, oscillation tube, ignition tube, magnetron, transistor, sealing plug, relay, integrated circuit leads, chassis, shell, bracket and other glass seal. In the application should be selected glass and alloy expansion coefficient to match. According to the use of temperature to strictly test its low temperature tissue stability. In the processing process should be appropriate heat treatment to ensure that the material has a good deep drawing performance. When the use of forging materials should be strictly tested its air tightness.
Kovar Chemical Composition:
Kovar Physical Properties:
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