Insert Layer Design Using Residual Stress in Si_3N_4/Steel Joining as Parameter(Mechanics, Strength & Structural Design)

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The present paper investigates the complex relation among insert layer and cracking susceptibility in simple brazed Si_3N_4/steel joints. The relation among insert metal chemistry, hardness (yield stress), microstructure and thickness of the insert layer, and cracking susceptibility was evaluated using a series of binary Cu-X insert metals (Cu-5wt.%Cr, Cu-1wt.%Nb, Cu-3wt.%V, Cu-5wt.%Ti and Cu-10wt.%Zr). The use of higher yield stress insert metal increased the critical insert layer thickness at which cracking occurred in Si_3N_4/steel joints. These results were consistent with the mechanical modelling results presented previously. Crack free joints could be made using Cu-5wt.%Cr insert metal in a simple brazing operation, when the diameters of the silicon nitride and steel substrates were*10mm, and the insert layer thickness was around 0.2mm. When the diameter of the ceramic and metal substrates was*15mm, a special low expansion-high ductility (LE-HD) joining technique produced crack free joints. This technique involved the combination of a 5mm thick layer of tungsten insert metal with two ductile, 0.4mm thick layers of Cu-5wt.%Cr insert metal.
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