G - Physics – 21 – F
Patent
G - Physics
21
F
31/103
G21F 1/06 (2006.01) C04B 35/58 (2006.01)
Patent
CA 1192389
ABSTRACT OF THE INVENTION The invention relates to polycrystalline sintered compact based on europium hexaboride having a density of at least 85% of the theoretical density. The compacts comprise EuB6, from about 0.1to 10% by weight of B4C and, optionally, amorphous carbon, and have a total of Eu + B + C of at least 98.5% by weight. They have a homogeneous microstructure with mean grain sizes of less than 20 pm, in which, in addition to the crystalline phase EuB6-xCx, in which x has values of from 0 to 0.25, B4C can be detected as a separate, finely divided, crystalline phase. The sintered compacts can be manufactured from powder mixtures comprising europium hexaboride of stoi- chiometric composition and additions of boron carbide and/or mixtures of a carbon-containing material and a boron com- ponent by means of hot pressing in graphite moulds, by means of isostatic hot pressing in casings that can be sealed so that they are gas-impermeable, or by means of pressureless sintering. -25-
443875
Bechler Eckhart
Knoch Heinrich
Lipp Alfred
Schwetz Karl A.
Elektroschmelzwerk Kempten G.m.b.h.
Ridout & Maybee Llp
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