Pd40Ni40P20非晶合金在350~450℃空氣之氧化

The Oxidation of a Pd40Ni40P20 Bulk Amorphous Alloy at 350 ~ 450 ℃ in Dry Air

本研究探討鈀基Pd40Ni40P20非晶合金在350 ~ 450℃空氣下的氧化行為。研究結果顯示，鈀基非晶合金之氧化動力學在350 ~ 450℃中遵守拋物線型定律，且氧化速率隨溫度上升而加快；由穿透電鏡分析得知，鈀基非晶合金氧化後主要生成單一的氧化鎳（NiO）層，並在氧化層下方有鈀磷的富集層生成，顯示氧化物的生成主要是由鎳離子外擴散所致。此外，由XRD分析得知，非晶合金在390℃氧化10分鐘後基材即有Pd3P及Ni3P兩種結晶相生成，顯示非晶合金基材於氧化初期已有結晶相變化的發生。

The oxidation behavior of a Pd40Ni40P20 (in at.%) bulk-metallic glass (BMG) was studied over the temperature range of 350 ~ 450 ℃ in dry air. The oxidation kinetics of the BMG alloy generally followed the parabolic rate law, with its oxidation rate increasing with temperature. Based on transmission electron microscopy (TEM) analyses, an NiO layer formed on the BMG surface after the oxidation, and a Pd-rich layer formed beneath the scales. After a short-term oxidation at 390 ℃ for 10 min, the amorphous substrate was transformed into two crystalline phases of Pd3P and Ni3P, indicating a phase transformation of the substrate at the initial-stage oxidation.