Abstract
The products derived from the reaction between Si3N4 and Fe-Ni alloy have been investigated. Si3N4-alloy powder mixtures were isothermally heated under a N2 or Ar atmosphere at temperatures from 1123 to 1573 K. The reaction products were examined by X-ray diffraction.At low temperatures, Fe-Ni-Si solid solution was produced and the lattice constant of γ-phase decreased from 0.3591 to 0.3565 nm. At high temperature and on prolonged heating, silicides were formed by the disappearance of γ-phase. Prior to the occurrence of the iron silicide, nickel silicide was formed. Under the N2 atmosphere, Ni3Si was slightly produced at 1323 K and disappeared at 1373 K. Under the Ar atmosphere, Fe5Si3 and FeSi were produced in addition to Ni5Si2, Ni2Si and Fe3Si which were the reaction products under the N2 atmosphere, whereas the nitrides of Fe and Ni were not detected even under N2.
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