Effects of Microstructures and Compositions on Thermal Conductivity of Cast Iron

• Main Authors: Ping-Chang Young, 楊秉昌
• Other Authors: Jhewn-Kuang Chen
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/y98n4n

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 97 === Cast iron is widely used for its growing demands in high temperature environment, e.g. disc brakes, engine exhaust manifolds and cylinders, and so on. Thermal conduction properties of such castings are particularly important in these applications. The current research studies the effects of three factors upon thermal conductivity of cast irons including matrix phase, shape of graphite, and alloying elements patterns. Both room temperature and high-temperature thermal conductivity are measured to compare with theoretically predicted values. It is found that the calculated thermal conductivity matches well with the measured values. The matrix phase has little effects on thermal conductivity, while flake graphite greatly increases thermal conductivity of cast irons. Alloying elements affect thermal conductivity properties of cast irons mainly by modifications of their microstructures.