Co69Fe4Ni1Mo2B12Si12非晶薄帶在450℃~600℃之空氣氧化行為研究

Air Oxidation Behavior of a Co69Fe4Ni1Mo2B12Si12 Amorphous Ribbon

本研究探討20μm厚度的鈷基非晶薄帶（Co69Fe4Ni1Mo2B12Si12，at.%）在450 ~ 600℃乾空氣中之氧化行為，研究結果顯示，在各溫度下之氧化動力學呈現複雜而多段拋物線的趨勢，且氧化速率隨溫度上升而增快。由TEM分析得知，鈷基非晶合金氧化後其氧化層主要為CoO，再經由XRD分析得知，其基材有Co2B、Co3B及純鈷（HCP）等結晶相產生，顯示非晶合金經高溫氧化後之基材有相變化發生。

The oxidation behavior of a 20 μm-thick Co-based amorphous ribbon (2705M, Co69Fe4Ni1Mo2B12Si12 in at.%) was studied over the temperature range of 450 ~ 600 ℃ in dry air. The oxidation kinetics of the Co-based alloy at three selected temperatures generally followed a complex multi-stage parabolic-rate law, of which the oxidation rates increased with increasing temperature. In general, the scale formed on the Co-based alloy consisted of an exclusive cubic- CoO. Based on XRD analyses, three crystalline phases of Co2B, Co3B and hcp-Co were detected, indicating that phase transformation of the amorphous substrate occurred.