【机】 方向性凝固

文摘:用定向凝固液淬法制备了具有各种石墨形态的铸铁试样，借助于金相显微镜、SEM等对其进行了观察分析，发现界面推进速度对固液界面形貌及石墨形态均有影响，并考察了在界面推进速度相同的情况下，微量元素铈、硫对石墨形态的影响.

摘要阐述了真空熔炼、氢气保护下引法连续定向凝固工艺。

stacked double directional throttle valve

directional component

directional derivative

directional selection

solenoid directional valve

radio beacon without directional information

bi-directional dialog

error in bearing (tuning error, directional error)