Nitriding of Metal Droplets in Synthesis of Intermetallic Matrix Composite Coatings by Reactive RF Plasma Spraying

Y. TsunekawaM. Okumiya


This paper presents a novel in situ production method of intermetallic matrix composites by reactive RF plasma spraying with premixed elemental powders. RF plasma spraying, which is characterized by high temperature and low velocity of the plasma flame, is suitable to synthesize in situ composites without preparing any ceramic fibers or particles. The flight velocity of molten titanium (Ti) droplets in the plasma flame is 39-47 m/s; it is approximately 1/3 of that in DC plasma flame at low pressure. Typical splat morphology of impinged Ti droplets on a stainless steel substrate is a disk-type with an outer peripheral fringe. If nitrogen (N2) partial pressure in the plasma gas increases or supplied Ti powder size becomes finer, the splats containing prominent dots with smaller flattening ratio appear along with the plain disk-type. An increase in N content is recognized in all the splats sprayed with higher N2 partial pressure or finer Ti powder, especially the splats containing prominent dots, which correspond to TiN, are twice as high N content as that in the plain disk-type. Aluminum (Al) splats are classified into two categories: a disk-type with an irregular outer periphery and a semi- massive-type. Oxygen exists on the spl...Continue Reading

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