expansion alloy 4J29

Domestic and foreign approximate grades (Chinese)

• United States: Kovar (UNS K94610)
• Germany: 1.3981
• Japan: Pernifer 2918
• France: NILO K
• international standards: ASTM F15

chemical composition
4 J29 alloy is as follows:
-Nickel (Ni):29%
-Cobalt (Co):17%
-Iron (Fe): balance
-Other elements: trace elements such as carbon (C), manganese (Mn), silicon (Si)

physical properties
-Density: 8.2 g/cm & sup3;
-Melting point: 1450°C
-Coefficient of thermal expansion: approximately 5.5 x 10 "/°C in the temperature range of 20 - 400°C

mechanical properties
-Tensile strength: about 450 MPa
-Yield strength: about 310 MPa
-Ductility: Good, suitable for drawing and forming processing
-Hardness: HV 150 - 200

Application areas
-electronic packaging: packaging materials for transistors, diodes, integrated circuits.
-Optics: Suitable for use in optical and electronic devices, providing sealing and thermal stability.
-Vacuum Devices: Used in vacuum tubes and laser devices, it can provide hermetic packaging.

Supply Specifications
-shape: bar, plate, strip, pipe, etc.
-size: customized according to customer needs