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solutes with very high melting points

  1. Jan 3, 2017 #1
    Does anyone know of any solutes (such as sodium chloride) that have VERY high melting points (preferably 1800C or higher)? They dont have to be water soluable but they need a solvent that can disolve them.
     
  2. jcsd
  3. Jan 3, 2017 #2
    if you put "melting points of compounds" in search , you get some helpful links .... http://www.gcsescience.com/imeltcomplz.htm ... nothing soluble , except by dissolving in weak acid .... zinc oxide 1975C
     
  4. Jan 3, 2017 #3

    Nidum

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    Have you looked at metal oxides ? Alumina in particular has a very high melting point and can be made into colloidal suspensions and dissolved by acids ?
     
  5. Jan 4, 2017 #4
    very awesome, thank you. Trying to machine a substance to form another molten material around and then be able to disolve it away so I can make complex internal structures that would be incredibly expensive to machine.
     
  6. Jan 4, 2017 #5

    Nidum

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    You need ceramic core materials for that . These are commercially available as either cement like materials which can be moulded or as solid blocks which can be machined . They will dissolve away in special etchant mixes . Different etchant mixes are made so that depending on which metal you are casting the core will etch away preferentially to the metal .

    These ceramic core materials are essentially the same ones as are used for the moulds when casting components like Nimonic turbine blades by the lost wax process .
     
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