The suboxide of boron,
B6O
, has been prepared as a pure crystalline powder and in dense solid masses. The existence of
B6O
was substantiated from crystallographic, chemical, and density data. Information on x‐ray diffraction, chemical formation, oxidation resistance, and stability is also described.
B6O
was found to have a greater diamond pyramid hardness than boron carbide.
Subsolidus phase relations in the low‐Y2O3 portion of the system ZrO2‐Y2O3 were studied using DTA with fired samples and X‐ray phase identification and lattice parameter techniques with quenched samples. Approximately 1.5% Y2O3 is soluble in monoclinic ZrO2, a two‐phase monoclinic solid solution plus cubic solid solution region exists to ∼7.5% Y2O3 below ∼500°C, and a two‐phase tetragonal solid solution plus cubic solid solution exists from ∼1.5 to 7.5% Y2O3 from ∼500° to ∼1600°C. At higher Y2O3 compositions, cubic ZrO2 solid solution occurs.
Research studies have resulted in the development of an oxygen‐deficient zirconia material modified in a novel way to make it thermally stable and inert to molten titanium. It is possible to melt titanium in crucibles of this material with no significant increase in hardness. However, limitations regarding overheating and soaking must be taken into account.
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