We aim to fabricate a high-energy ball milling apparatus and utilize a specific phase-change material (PCM) as its main heat-control system. For that, we look for PCMs that can handle temperatures up to 300 degrees Celcius.
The thermal oils that are used for high temperature heat transfer, such as Theminol boil somewhere near 400 C and may be possibilities. Shell and BP have data sheets for these oils.
There is quite a large number of PCMs that operate above 300C. Really, any material that melts is a phase change material, so above 300C you're mainly looking at lower temperature metal alloys and salts. For reference here's a material review i wrote a few years back (preprint copy is available at the link). Most commercial applications focus on lower temperatures, though, so I'm not familiar with any current companies specializing in higher temperature materials for PCM applications.
Article A review of phase change materials for vehicle component the...
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