Iron-36%Nickel alloy has an extremely small thermal expansion coefficient at room temperatures. It is an essential material for precision measurement equipments, precision machine parts, etc.
Kovar, thermal expansion coefficient of which is adjusted equivalent to that of ceramics, is used for sealing.
Thermal expansion curve
Description of materials
[Basic composition]
- Invar (K-EL70) 36Ni-Fe
- Super invar(K-EL50) 32Ni-5Co-Fe
- Kovar (K-ET52) 29Ni-17Co-Fe
Characteristics
[Physical properties]
Coefficient of thermal expansion: Upper α20-60℃, lower α20-100℃
[Mechanical properties]
K-EL70、K-EL50 900℃ after heat treatment
K-ET52 1100℃ after heat treatment