US PATENT SUBCLASS 75 / 235
.~.~.~.~ Oxide of Aluminum(Al), Beryllium(Be), Magnesium(Mg), Alkaline earth metal, Scandium(Sc), Yttrium(Y), Lanthanide metal, Actinide metal, Titanium (Ti), Zirconium(Zr), or Hafnium(Hf)

Current as of: June, 1999
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75 /   HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES

300  DF  COMPOSITIONS {5}
228  DF  .~ Consolidated metal powder compositions {4}
230  DF  .~.~ With nonmetal constituent - Silicon(Si) considered a metal (e.g., cermet, etc.) {5}
232  DF  .~.~.~ Oxide containing {3}
235.~.~.~.~ Oxide of Aluminum(Al), Beryllium(Be), Magnesium(Mg), Alkaline earth metal, Scandium(Sc), Yttrium(Y), Lanthanide metal, Actinide metal, Titanium (Ti), Zirconium(Zr), or Hafnium(Hf)

DEFINITION

Classification: 75/235

Oxide of Aluminum (Al), Beryllium (Be), Magnesium (Mg), Alkaline earth metal, Scandium (Sc), Yttrium (Y), Lanthanide metal, Actinide Metal, Titanium (Ti), Zirconium (Zr), or Hafnium (Hf):

(under subclass 232) Composition in which the oxide is restricted to one or more of alumina, beryllia, magnesia, lime, strontia, baria, titania, zirconia, hafnia, or an oxide of radium, scandium, yttrium, a lanthanide metal or an actinide metal, including thoria and uranium oxide.

(1) Note. Included herein are those oxides having a free energy of formation (F) at 1,000 C. of greater than 80 kilocalories per gram atom of oxygen. The following table, taken from U.S. Patent 3,377,143, is presented as a guide:

Oxide, F, Oxide, F, Oxide, F

Y2O 125, Hfo, 105, TiO, 95

CaO 122, CeO2, 105, TiO2, 85

La2O3, 121, Al2O3, 104, SiO2, 78

BeO 120, ZrO2, 100, Ta2O5, 75

ThO2, 119, BaO, 97, V2O3, 74

MgO, 112, ZrSiO4, 95, NbO2, 70

UO2 105, Cr2O, O3, 62

SEE OR SEARCH CLASS

106, Compositions: Coating or Plastic,

85+, for inorganic settable compositions.

252, Compositions,

625+, for radioactive compositions in general.

264, Plastic and Nonmetallic Article Shaping or Treating: Processes,

0.5, for shaping or treating radioactive material.

501, Compositions: Ceramic,

94+, for a refractory ceramic composition having a matrix of one or more of the above oxides.