N_2雰囲気下でのSi_3N_4とFe-Cr合金との反応

概要

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In relation to the joining of silicon nitride ceramics to metal, the reaction products and reaction mechanism between Si_3N_4 and Fe-Cr alloy have been investigated at temperatures from 873 to 1573 K under N_2 atmosphere. Using Si_3N_4/Fe-62.5 mass% Cr alloy powder mixtures, the reaction rates were determined by thermogravimetry, and the reaction products were identified by X-ray diffraction. Below 1273 K, the mass gain was observed, because chromium in alloy reacted with N_2 gas to produce Cr_2N and CrN. Above 1323 K, the initial gain and the subsequent loss in mass were observed. The mass loss resulted from the formation of Fe-Cr-Si solid solution and silicides of Fe or Cr. At higher temperatures and on prolonged heating, the reaction products changed in the following order: Cr_2N, Cr_2N+CrN, Cr_2N, Cr_2N+Fe_3Si, Cr_2N+Fe_3Si+X, Fe_3 Si +X, Cr_3Si +Fe_3Si +x, Cr_3Si +X. Unknown compound X, consisting of Fe, Cr, Si and N, was detected as both Cr_2N and Fe_3Si disappeared.
社団法人日本セラミックス協会の論文
1997-01-01