C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/128
C04B 35/00 (2006.01) C04B 35/563 (2006.01)
Patent
CA 1115506
ABSTRACT OF THE DISCLOSURE 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 2100-2200°C. The shaped articles thus obtained are polycrystalline and, insofar as they correspond to the stoichiometric composition B4C, single-phase; they have an average grain size of not more than 10 µm, a density of at least 90% of the theoretical density of boron carbide and a flexural strength of at least 300 N/mm2. The fracture mode of the sintered articles is completely transcrystalline.
316384
Schwetz Karl A.
Vogt Georg
Elektroschmelzwerk Kempten G.m.b.h.
Malcolm Johnston & Associates
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