Abstract
This paper describes experiments to measure the interfacial shear strengths of bonds formed between nickel, chromium and nichrome sheets hot pressed on to α-Al2O3 single crystal plaques. Nickel developed bonds of ∼8×103 psi (56 MN. m−2) in shear when pressing was carried out under non-reducing conditions at 1100° C, 1 tsi (15 MN. m−2) for 2 h: in the case of chromium, the effect of pressing temperature (1000 to 1300° C) pressing pressure (1/2 to 3 tsi [7.7 to 45 MN. m−2]) and pressing time (1/2 to 7 h) on the bond was investigated. Nickel-chrome alloys produced from alternate nickel and chromium strips showed bond strengths up to 20×103 psi (140 MN. m−2) whilst commercial nickel-chrome (containing a silicon impurity) was not as effective in bonding to alumina. In material prepared from alternate strips of nickel and chromium, the degree of alloy homogenisation was investigated using microprobe analysis and suggestions made as to the mechanism of the interfacial reactions with alumina.
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References
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C. A. Calow and I. T. Porter, in press.
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Calow, C.A., Bayer, P.D. & Porter, I.T. The solid state bonding of nickel, chromium and nichrome sheets to α-Al2O3 . J Mater Sci 6, 150–155 (1971). https://doi.org/10.1007/BF00550346
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DOI: https://doi.org/10.1007/BF00550346