Properties of Rare Metal Molybdenum
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- Category: Molybdenum knowledge
- Published on 09 September 2013
- Written by 陈桂兰
- Hits: 308
The boiling point and the conductive performance of molybdenum are outstanding. Coefficient of linear thermal expansion of titanium is small. It is easier to process molybdenum than processing tungsten.
The thermal conductivity and the specific heat of rare metal molybdenum are well collocated, which makes molybdenum become the natural choice for thermal shock resistance and thermal fatigue resistance. The melting point of molybdenum is next to that of tungsten, tantalum. But the density of molybdenum is much lower than that of tungsten and tantalum. So the specific strength (strength / density) is greater than that of tungsten, tantalum and other metals. Molybdenum can be used in fields which has key requirements to the weight.
The main disadvantages of molybdenum are the high temperature oxidation resistance performance is poor and ductility at room temperature ductility is poor. In order to foster strengths and circumvent weaknesses, for high temperature oxidation, people usually adopt the coating to control high temperature oxidation; As for the low temperature embrittlement, people improve the strength through alloy and adding carbide.
La-Mo alloy made of lanthanum and molybdenum shows outstanding creep resistance and high temperature deformation ability. At high temperature, these characteristics are especially obvious.
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