Microstructural characteristics of TiB_2-TiC-NiAI composite coatings via PlasmaCladding Process

摘要

TiB_2-TiC NiAl composite coatings have been prepared via Plasma Cladding Process. The phase composition, microstructure and influence of Ni-AI content were investigated by X-ray diffraction, scanning electron microscopy and electron probe micro-analyser. The results show that the coating from Ti-B_4C consists of TiB_2 and TiC, while coatings from Ti-B_4C and Ni-AI mixed system consist of TiB_2, TiC and NiAl phases. TiB_2and TiC are homogenously distributed in the coating due to NiAl additives. TiB_2 exhibits hexagon or long strip shapes and TiC is tend to spherical shapes, while NiAl phase has no regular shape distributing among TiB_2 and TiC particles. The prepared TiB_2-TiC based composite coating shows higher density with the rising of NiAl content.