Chemistry of inorganic compounds – Boron or compound thereof – Binary compound
Patent
1978-11-15
1980-03-25
Peters, G. O.
Chemistry of inorganic compounds
Boron or compound thereof
Binary compound
106 43, 264332, C04B 3552, C01D 3136
Patent
active
041950666
ABSTRACT:
A method of producing dense shaped articles of pure boron carbide that optionally contain 0.1 to 8% by weight of free carbon in the form of graphite is disclosed involving the steps of homogeneously mixing boron carbide in submicron powder form with small quantities of a carbon containing additive, forming the powder mixture into a shaped green body and then sintering the body in a controlled atmosphere and in the absence of external pressure at a temperature of about 2100.degree.-2200.degree. C. The shaped articles thus obtained are polycrystalline and, insofar as they correspond to the stoichiometric composition B.sub.4 C, single-phase; they have an average grain size of not more than 10 .mu.m, a density of at least 90% of the theoretical density of boron carbide and a flexural strength of at least 300 N/mm.sup.2. The fracture mode of the sintered articles is completely transcrystalline.
REFERENCES:
patent: 2027786 (1936-01-01), Ridgway et al.
patent: 2938807 (1960-05-01), Andersen
patent: 3914371 (1975-10-01), Benton et al.
patent: 4005235 (1977-01-01), Prochazka
Schwetz Karl A.
Vogt Georg
Elektroschmelzwerk Kempten GmbH
Peters G. O.
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