Composite powder prepared of calcium oxide stabilzed ZrO2(CSZ) and NiCr by vacuum sintering is studied,and the effect of additive TiO2 on its properties is discussed. The morphology and phases of the powder were measu...Composite powder prepared of calcium oxide stabilzed ZrO2(CSZ) and NiCr by vacuum sintering is studied,and the effect of additive TiO2 on its properties is discussed. The morphology and phases of the powder were measured and determined by SEM. EPMA, XRD methods and the testing of flowability, bulk density and microhard-ness. The results show that the metallic components in the powder are in homogeneous distribution , the flowability, bulk density and microhardness are superior to the ZrO2-NiCr powder prepared by mechanically mixing. All components in the coating made of the composite powder are well-distributed because of avoiding segregation in the middle of mixing. It proves that the composite powder is an excellent material for plasma spraying.展开更多
In order to improve the lifetime of continuous casting,ZrO_2-MoSi_2 composite powder used for plasmaspraying was prepared via spray drying and vacuum sintering.The microstructure and characteristics of the powder were...In order to improve the lifetime of continuous casting,ZrO_2-MoSi_2 composite powder used for plasmaspraying was prepared via spray drying and vacuum sintering.The microstructure and characteristics of the powder were investigated by particle size analysis,scanning electron microscopy and X-ray diffraction,respectively.The results show that the average viscosity and settlement rate are 60.43 mPas and 1.86%,respectively,when adding ammonium polyacrylate as a dispersant and polyvinyl alcohol as a binder.The powder obtained at the solid content of 70 wt.%,the dispersant amount of 1wt.%,the binder of 10 wt.%,and the sintering temperature of 1200 "C has the spherical agglomerate and a moderate size,which can be melted on the composite coating surface with a good compactness via plasma-spraying.展开更多
文摘Composite powder prepared of calcium oxide stabilzed ZrO2(CSZ) and NiCr by vacuum sintering is studied,and the effect of additive TiO2 on its properties is discussed. The morphology and phases of the powder were measured and determined by SEM. EPMA, XRD methods and the testing of flowability, bulk density and microhard-ness. The results show that the metallic components in the powder are in homogeneous distribution , the flowability, bulk density and microhardness are superior to the ZrO2-NiCr powder prepared by mechanically mixing. All components in the coating made of the composite powder are well-distributed because of avoiding segregation in the middle of mixing. It proves that the composite powder is an excellent material for plasma spraying.
文摘In order to improve the lifetime of continuous casting,ZrO_2-MoSi_2 composite powder used for plasmaspraying was prepared via spray drying and vacuum sintering.The microstructure and characteristics of the powder were investigated by particle size analysis,scanning electron microscopy and X-ray diffraction,respectively.The results show that the average viscosity and settlement rate are 60.43 mPas and 1.86%,respectively,when adding ammonium polyacrylate as a dispersant and polyvinyl alcohol as a binder.The powder obtained at the solid content of 70 wt.%,the dispersant amount of 1wt.%,the binder of 10 wt.%,and the sintering temperature of 1200 "C has the spherical agglomerate and a moderate size,which can be melted on the composite coating surface with a good compactness via plasma-spraying.
