2016年4月4日星期一

The Use of Tungsten in Vacuum Furnace Applications/:Shenzhen Sunrise Metal Industry Co.,Ltd 深圳市东升稀有金属有限公司

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By Dan Herring
Tungsten is used in vacuum furnaces (Fig. 1) when there is a need for structural integrity at elevated temperature and/or in situations where other materials may degrade, such as when lower melting point eutectics are a concern. One example of its use in is roller rail assemblies in which graphite wheels are positioned between molybdenum rails using tungsten axles (Fig. 2).
figure-2 sm
Figure 1 - Typical Vacuum Furnace Components (Photograph Courtesy of Plansee)Figure 2 - Combination Molybdenum/Graphite/Tungsten Hearth Rail Assembly in a Continuous Vacuum Furnace (Photograph Courtesy of C. I. Hayes, a Gasbarre Furnace Group Company)
Tungsten Applications in Vacuum Furnaces
Tungsten (chemical symbol W) is a member of the family of refractory metal (Mo, Nb, Re, Ta, W) and has the highest melting point and vapor pressure of this group. Due to this unique property, it is commonly used as a material of construction in specific areas of vacuum furnace hot zones operating above 1315ºC (2400ºF).
vacuum-furnaces-lg
Figure 3 - Typical High Temperature Vacuum Furnace (courtesy of Vac Aero International)
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