Expendable salt core for casting

Abstract

An expendable salt core has the shape of a water jacket by, e.g., die casting using a salt of bromine and at least one of sodium and potassium, and a salt of carbonic acid and at least one of sodium and potassium. The expendable salt core is formed to contain at least one of potassium and sodium as a cation, and bromine and carbonic acid as anions. For example, the expendable salt core is formed by casting using a melt obtained by melting a salt mixture of sodium bromide and sodium carbonate.

1 - 9 . (canceled) 
   
   
       10 . An expendable salt core comprising:
 a molten salt containing bromine ions, carbonate ions, and at least one of sodium ions and potassium ions.   
   
   
       11 . An expendable salt core according to  claim 10 , wherein the molten salt contains sodium ions, bromine ions, and carbonate ions. 
   
   
       12 . An expendable salt core according to  claim 11 , wherein a molar ratio of carbonate ions in all the anions in the molten salt is about 30 mol %. 
   
   
       13 . An expendable salt core according to  claim 11 , wherein a molar ratio of carbonate ions in all the anions in the molten salt is about 50 mol % to about 80 mol %. 
   
   
       14 . An expendable salt core according to  claim 10 , wherein the molten salt includes potassium ions, bromine ions, and carbonate ions; and a molar ratio of carbonate ions in all the anions is about 30 mol %. 
   
   
       15 . An expendable salt core according to  claim 10 , wherein the molten salt includes potassium ions, bromine ions, and carbonate ions; and a molar ratio of carbonate ions in all the anions is about 50 mol % to about 90 mol %. 
   
   
       16 . An expendable salt core according to  claim 10 , wherein:
 the molten salt includes sodium ions, potassium ions, bromine ions, and carbonate ions;   a melting temperature of the molten salt falls within a range of about 600° C. to about 680° C.;   a molar ratio of potassium ions in all the cations is about 50 mol % to about 90 mol %; and   a molar ratio of carbonate ions in all the anions is about 40 mol % to about 80 mol %.   
   
   
       17 . An expendable salt core according to  claim 10 , wherein a plurality of granular crystals are provided in a parent phase in a dispersed state. 
   
   
       18 . An expendable salt core according to  claim 17 , wherein the granular crystals include carbonate ions and at least one of sodium ions and potassium ions.