The interaction between composite materials based on aluminum nitride and a phosphate binder (PB) and a CaCl2 – KCl molten salt solution is studied as a function of time (10 – 220 h) by a gravimetric method. The test specimens studied were sintered (AlN + PB)-based composite, hot-pressed Y2O3-doped aluminum nitride, graphite, and (AlN + PB)-coated graphite. The concentration of aluminum and phosphor in the molten phase tend to increase with time; presumably, Al and P occur in solution in the form of calcium aluminates, phosphates, or alumophosphates. Of the two processes — dissolution of the phosphate binder and oxidation of the aluminum nitride matrix — the former is prevailing.
Refractories and Industrial Ceramics – Springer Journals
Published: Oct 13, 2004
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