Abstract
In view of the good thermal insulation, good high-temperature phase stability, high thermal expansion coefficients and ferroelastic transformation of YTaO4 ceramics, which can be prepared as thermal insulation and anti-oxidation coating material on Ti6Al4V alloy (TC4). Herein, a bond coating (BC, NiCrAlY) and top coating (TC, YTaO4) were deposited on a TC4 surface via atmospheric plasma spraying (APS), the microstructure, multi scale mechanical properties and failure mode of TC were investigated. XRD results demonstrate YTaO4 coating has good phase stability below 900 ?, both average particle size and intrinsic strain are calculated by Williamson-Hall (W-H) method. The surface hardness, wear resistance and service life of YTaO4 coating deposited on TC4 is higher than that of pure TC4, and thermal shock tests results (> 300 times at 900 ?; 269 times at 1000 ?; 79 times at 1100 ?) exhibits YTaO4 coating has an excellent protective effect against thermal shock and oxidation for TC4.
NSTL
Elsevier