Papers by Author: Y.S. Lin

Abstract: MnCO3 was added into ZnNb2O6 ceramics to obtain excellent microwave dielectric properties. The samples were prepared by conventional solid-state reaction method. The effects of the amount of MnCO3 on sintering temperatures, ceramic densities and contraction were systematically investigated. The crystalline structure of ceramic body was analyzed by XRD. The ceramic microstructure was observed by SEM. The dielectric properties of ZnNb2O6 ceramics were measured by a vector network analyzer at microwave frequency, which showed: er = 22.65, Q×f = 36700 GHz (loaded value) and tf = -40 ppm/°C.

Abstract: High speed milling is widely employed in die and mold machining, and the attentions had been gradually paid on the details during the process. Based on the high-speed milling experiments of hardened steel with different extended length of tool, cutting force, cutting vibration, tool wear and surface roughness were measured and analyzed in this paper. It was founded that cutting force and vibration were not increasing straightly with the addition of extended length, but fell down when exceeded a certain value, and the surface quality improved at same time.