Neutron absorber based on boron carbide and carbon and a process

Details Neutron absorber based on boron carbide and carbon and a process Neutron absorber based on boron carbide and carbon and a process

1978-11-15

1981-02-24

Kyle, Deborah L.

Compositions

X-ray or neutron shield

106 43, 106 56, 176DIG2, 250517, 250518, 250519, 264 291, G21F 106, C04B 3568

Patent

active

042526914

ABSTRACT:
The subject of the invention is thin large-area neutron-absorber plates having a volume composition of from 40 to 60% and preferably from 45 to 60% by volume of boron carbide, from 25 to 5% by volume and preferably 15 to 5% by volume of free carbon, the remainder being pores, a density of from 1.4 to 1.8 g/cm.sup.3, a flexural strength at room temperature of from 15 to 45 N/mm.sup.2, a compressive strength at room temperature of from 25 to 60 N/mm.sup.2, a modulus of elasticity at room temperature of from 10,000 to 20,000 N/mm.sup.2, and a resistance to ionizing radiation of at least 10.sup.11 rad, which plates may be produced by mixing boron carbide powder, containing at least 75% by weight of boron and a proportion of boron oxide of less than 0.5% by weight, and having a particle size distribution of at least 95% finer than 50 .mu.m and, optionally, graphite powder with a pulverulent organic resin binder and a wetting agent, shaping the mixture under pressure at room temperature, curing the resin binder at temperatures of up to 180.degree. C., and then coking the shaped plates with the exclusion of air at temperatures of up to approximately 1000.degree. C. with a controlled temperature increase.

REFERENCES:
patent: 3133887 (1964-05-01), Alliegro et al.
patent: 3153636 (1964-10-01), Shanta et al.
patent: 3810963 (1974-05-01), Benton et al.
patent: 3969124 (1976-07-01), Stewart
patent: 4156147 (1979-05-01), Naum et al.

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