窒化ケイ素の活性金属ろう付界面における侵食現象

概要

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To clarify the formation mechanism of the reaction layer, the behaviour of elements composing Si_3N_4 and brazing filler at the brazed interface was examined by SEM observation and EPMA analysis. The erosion depth of the brazed ceramic surface was also evaluated by surface roughness measurement, in order to examine the relation between the erosion depth and the brazing condition. The results of EPMA analysis suggested that Si_3N_4 was eroded with diffusion of Si and N to reaction layer. According to the erosion test using Ag-Cu-4 mass% Ti, the isothermal erosion depth of Si_3N_4 increased proportional to square root of brazing time in the temperature range of 1123 K to 1223 K. The temperature dependence of the rate constants fits an Arrhenius equation yielding activation energies of 127.5 kJ/mol.
社団法人溶接学会の論文
2000-05-05