Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1983-12-19
1986-09-30
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 96, 264 65, 264332, 252478, C04B 3556, C04B 3558, C04B 3568
Patent
active
046147241
ABSTRACT:
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 EuB.sub.6, from about 0.1 to 10% by weight of B.sub.4 C 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 .mu.m, in which, in addition to the crystalline phase EuB.sub.6-x C.sub.x, in which x has values of from 0 to 0.25, B.sub.4 C can be detected as a separate, finely divided, crystalline phase.
The sintered compacts can be manufactured from powder mixtures comprising europium hexaboride of stoichiometric composition and additions of boron carbide and/or mixtures of a carbon-containing material and a boron component 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.
REFERENCES:
patent: 4265666 (1981-05-01), Contre et al.
Hollenberg et al.; "Hot Pressing of EuB.sub.6 ", Ceramic Bulletin, vol. 60, 1981, pp. 478-480.
Chemical Abstracts, vol. 93, p. 614, No. 56143m, K. A. Schwetz et al. in Ceramurgia International, vol. 5 (1979), pp. 105-109.
Chemical Abstracts, vol. 92, p. 547, No. 30513m, D. E. Mahagin.
Chemical Abstracts, vol. 88, p. 507, No. 160088c, U. Wehmann et al.
G. W. Hollenberg et al. in American Ceramic Society Bulletin, vol. 60 (1981), pp. 478-480.
K. Schwetz et al. in "Atomwirtschaft", vol. 18 (1973), pp. 531-534.
H. Spenke in "Atomwirtschaft", Mar. 1972, pp. 161-164.
E. W. Hoyt et al. in General Electric Report GEAP-3332, Contract No. AT(04-3)-189, Jun. 6, 1960.
A. E. Pasto et al. in Trans. Amer. Nucl. Soc., vol. 26 (1977), p. 176.
Bechler Eckhart
Knoch Heinrich
Lipp Alfred
Schwetz Karl A.
Bell Mark L.
Elektroschmelzwerk Kempten GmbH
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