A PROCESS FOR PREPARING NICKEL BASED NANOCOMPOSITE COATING CONTAINING PARTICLES OF YTTRIA STABILIZED CUBIC XIRCONIA-ALUMINA (NI-YZA) USEFUL FOR TRIBOLOGICAL APPLICATIONS AND NI-YZA NANOCOMPOSITE COATING PREPARED THEREBY

摘要

The present invention provides a novel nickel based nanocomposite coating containing embedded particles of 5 to 20 wt%, 8mol% yttria stabilized cubic zirconia, 80 to 95 wt% alumina (YZA) and a process for preparing the same. Nanosized YZA powder in the present invention is prepared by solution combustion process. Further, this nanoceramic powder is co-deposited with Ni for preparing nanocomposite coating from a nickel sulfamate bath on metal substrates. In the present invention, YZA particles are embedded in the nickel matrix, which have resulted in the improved tribological properties. Present invention also reveals synergistic combination of Ni-YZA, which gives nanocomposite coating having higher microhardness, lower friction coefficient and higher corrosion resistance when compared to Nickel coating.