Heater made of molybdenum
Molybdenum possesses high heat resistance which allows reaching a working temperature of more than 2000 °C. Molybdenum heater is very hard and can long-term work in aggressive liquid and gaseous environments without fracture. Molybdenum heater has high module of elasticity, low linear expansion thermal coefficient. These properties give a possibility to use it in the harshest manufacturing conditions. Molybdenum is more lightweight than tungsten almost twice. That is why molybdenum products have a higher strength-to-density ratio (at a temperature of not more than 1370°С).
Molybdenum reacts with salt, sulfuric acids only at a temperature of 80−100°C. Nitric, chloronitric acids dissolve molybdenum only at a temperature of 100 °C. It is resistant in cold alkali solutions, but it slowly fractures in hot alkali solutions. Additives of carbon, oxygen, silicon, aluminium, nitrogen, iron, sulfur, calcium and phosphorus that are included in commercial molybdenum significantly increase molybdenum properties. The main part of these additives makes molybdenum more brittle. The most detrimental additive is oxygen. If it constitutes 0.0008−0.004%, easy-melting oxides can lead to sharp increase of material brittleness that obstructs metal flow (especially if there are present carbon and nitric). With increasing of oxygen percentage (more than 0.015%), molybdenum becomes brittle and cannot be pressure treated.
Physical properties of molybdenum
|Temperature of characteristic receiving in °С||20°С|
|Coefficient of linear thermal expansion α [1/°С]||4.9x10-6|
|Specific heat at 20 °C [J/(kg/deg)]||0.256|
|Heat conductivity K [V/m*K]||142|
|Specific electric resistance R Оhm-mm2/m||0.054|
Virtually the only one demerit is high self-cost of molybdenum heaters, as long as molybdenum relates to rare-earth elements and it is hardly isolated in a pure state. Besides, it is refractory and hardly processed metal.
Molybdenum heaters are available in any configuration and size. Usually, they look like riveted shells of strip, flat, spiral or cylindrical shape made out of bands and sheets. They can have a bottom in which exists a hole for hydrogen (gas extraction) through a pipe of baked area. Tolerances and sizes comply with customer’s drawings. Manufacturing technology of heaters made of high-quality tungsten, molybdenum-tungsten (MoW30), or molybdenum is guaranteed by operational reliability and perfect heat resistance. Cost of heater depends on configuration complexity, sizes and additional requirements that are previously discussed.
Molybdenum heaters are the parts of hydrogenous or vacuum electric resistance furnaces. They can also be the parts of induction baking furnaces, which working temperature is more than 2000 °C. Such heaters are indispensable for sapphire and glass melting, single-crystal growing, baking of powder products etc.
Molybdenum heater supplier
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All products are certificated. Quality is guaranteed by rigorous technology compliance of a manufacture. Molybdenum heater is always in stock. There is the best molybdenum heater price from molybdenum heater supplier. Buy molybdenum heater in a moment! Our managers are always ready to give a knowledgeable assistance relatively choosing of products. You can easily buy molybdenum heater by connecting us with a convenient way for you. Phone numbers, e-mail addresses of the closest company’s offices are noted in section «Contacts». We offer the best molybdenum heater price from supplier. Order a service «Call-back» and our manager will help you to choose products that will fit your individual requirements. A quality complies with GOST (all-Union State Standards) and International Standards.