Compositions: coating or plastic – Coating or plastic compositions – Molds and mold coating compositions
Patent
1976-03-04
1977-08-09
Douglas, Winston A.
Compositions: coating or plastic
Coating or plastic compositions
Molds and mold coating compositions
106 55, 106 732, B28B 734, C04B 3550
Patent
active
040408450
ABSTRACT:
This ceramic composition is produced from a mixture of yttrium oxide and heavy rare earth oxides having an atomic number of from 64-71 in selected proportions for the construction of crucibles and the lining of molds employed in making castings of reactive metals, such as titanium and alloys thereof. The elements utilized in the composition impart a minimum of contamination to the molten metal during the melting and casting phases and are produced from an ore with only the refinement steps necessary so as to secure maximum economy and yet insure the production of castings of the highest quality.
REFERENCES:
patent: 3588573 (1971-06-01), Chen et al.
patent: 3682766 (1972-08-01), Maher
Richerson David W.
Schuyler, II Donald R.
Bell Mark
Douglas Winston A.
Grudziecki Ronald L.
McFarland James W.
Omohundro Herschel C.
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