|
1109 |
|
Preparation and characterization of nickel clad h-BN composite powders for abradable sealing coating |
|
Jinghui Liu* / GRIPM advanced materials Co., Ltd., General Research Institute for Nonferrous Metals (GRINM), China Zhongyuan Yang / GRIPM advanced materials Co., Ltd., General Research Institute for Nonferrous Metals (GRINM), China Limin Wang/ GRIPM advanced materials Co., Ltd., General Research Institute for Nonferrous Metals (GRINM), China Jinghuai Zhang/ GRIPM advanced materials Co., Ltd., General Research Institute for Nonferrous Metals (GRINM), China Shikai Yan/ GRIPM advanced materials Co., Ltd., General Research Institute for Nonferrous Metals (GRINM), China Feng Lin/ GRIPM advanced materials Co., Ltd., General Research Institute for Nonferrous Metals (GRINM), China Jun Li/ Guizhou Liyang Aero-Engine Corporation, China |
|
Nickel clad hexagonal boron nitride (h-BN) powders were prepared by reducing nickel ions from a solution under hydrogen pressure in the presence of ammonia as a complexing agent, and plasma spraying was carried out to deposit the corresponding coating. The microstructure, morphology and phase composition of the powders and the coating were characterized by optical microscope (OM), Scanning Electronic Microscope (SEM) and X-ray Diffraction (XRD), respectively. The results show that alkali solution pretreatment and activation procession are necessary for acquiring a dense and uniform nickel coating on the surface of the h-BN particles, and the h-BN particles are distributed well throughout the coating with the porosity of about 26%, which indicate that the coating was potential for abradable sealing application. |