Abstract
Refractory alloys made of niobium with boron and silicon are potentially attractive for high-temperature structural applications due to their interesting properties such as high melting point, oxidation resistance and mechanical properties [2007Fer]. Information presented in literature comprises the quasibinary section NbB2-NbSi2 [1982Ste], the liquidus surface projection in the Nb rich region [2001Can, 2003Jun], a solidus surface projection, melting point data for the Nb-Nb5Si3-NbB region [2004Kat], isothermal sections and phase relations at various temperatures and composition ranges [1960Now, 2001Can, 2004Kat, 2004Rod, 2007Fer] as well as temperature-composition sections [2001Can, 2004Kat]. Crystal structure data are published in [1960Now, 1982Ste, 2001Can, 2003Jun, 2004Ito, 2004Kat, 2004Rod, 2006Beh]. Table 1 summarizes applied experimental techniques as well as temperature and composition ranges studied. Reviews concern phase equilibria [1963Eng] and crystal structures [1957Kud, 1957Now, 1959Now, 1963Now]. Future refinement of phase equilibria will be necessary, in particular, constitution of the liquidus and solidus surfaces in the whole range of compositions as well as experimental determination of invariant equilibria. Furthermore a study of thermodynamic properties of B-Nb-Si alloys will become the basis for thermodynamic modelling of phase equilibria and new practical applications of niobium borosilicides.
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