MOLYBDENUM HCT
Foil Sheet Plate Wire Rod Fabricated Parts Pressed & Sintered Parts
In addition to pure molybdenum, Elmet offers HCT moly for use where retention of low temperature ductility after exposure to high temperatures is required. Its use is particularly applicable to resistance heating elements, lamp filament supports, sintering trays and electronic tube components.
Commercially pure molybdenum is invariably embrittled after use at high temperatures. This can result in unanticipated failures, especially where vibration or mechanical handling occurs. The loss of ductility is a direct result of the development of equiaxed grain structures resulting from the recrystallization process.
In contrast, recrystallized HCT moly develops interlocked, elongated grain structures which remain relatively ductile at room temperature and below.
This structure is achieved through small, controlled alloy additions and thermomechanical processing. The content of the residual alloy remains less than 200ppm. Ductility characteristics are dependent of the material form and physical dimensional parameters. Typically, thinner cross sections exhibit optimum properties. For design purposes, the density, heat capacity, thermal expansion and modulus of HCT are the same as pure molybdenum. The cold electrical resistivity is about 5% higher than the unalloyed material.