Bonding Behavior between Niobium and Reaction-Sintered SiC(Materials, Metallurgy & Weldability)

概要

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Reaction-sintered SiC containing 13 mass% Si is joined to Nb by solid state bonding in a vacuum. The joining strength of SiC/Nb joint increases to the saturated value of 88 MPa with increasing the joining temperature at the joining time of 1.8ks and the joining pressure of 1.96MPa. An increase in joining pressure raises the joining area at the interface of SiC/Nb joint. The change in joining time changes a little the joining strength of the joint at the constant joining temperature and pressure since the fracture takes place at the interface between the intermediate phase of Nb_5Si_3 and Nb. The intermediate phase is Nb_5Si_3 at joining temperatures below 1677K. The growth kinetic is expressed by Fick's law, and the activation energy for growth of Nb_5Si_3 is 456kJ/mol. The growth of NbSi_2 is preferential at joining temperatures above 1773K.
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