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Boron fade
Author(s) -
Schüler Peter,
Werner Dietrich
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198901688
Subject(s) - boron , annealing (glass) , inert gas , boron oxide , metallurgy , atmosphere (unit) , oxide , materials science , diborane , oxygen , chemistry , physics , composite material , thermodynamics , organic chemistry
At high temperatures of 900°C or more boron contained in steel escapes readily into an inert atmosphere as many scientists have already observed. The authors have investigated by theoretical analysis of the possible reasons for boron losses of unalloyed and low alloyed steels in an CH 4 /H 2 ‐atmosphere at 1000°C and 1 bar, i.e. boron volatilizes in elemental form, in form of boron oxide (B 2 O 3 ) or as diborane (B 2 H 6 ). It was proved that boron escapes from steel primarily as boron oxide, even if the atmosphere does not contain oxygen. Traces of oxygen in an annealing atmosphere seem to be sufficient to combine with the total boron content of the steel when being in the order of up to 100 ppm. A boron containing source such as boron oxide in sufficient amount in the annealing atmosphere can compensate boron losses of steels.