1000℃大気中におけるNi-Cr鋳造合金のトライボロジー特性（グレーズ酸化層のトライボロジー特性への影響）

概要

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Ni-Cr cast alloy showed the excellent tribological characteristics at 1000°C in air. In order to examine the relation between the tribological characteristics and the glaze oxide layer, detailed observation and chemical analysis of the layer was carried out. As a result, work hardening in the vicinity of base material interface and refinement of crystal grain within the glaze oxide layer were observed. These structures formation caused strength improvement and formation of harder layer than the base material. Finer crystal grain layer was formed at the outermost layer of the sliding surface, and this layer formation was attributed to decrease shear force. It is considered that, in addition to wear resistance due to the hard layer formation on sliding surfaces, low friction effect was generated by formation of the layer with low shear force on the hard layer, whereby the excellent tribological characteristics were obtained.