真空熔煉氣氛對鈷鉻鉬合金之性質影響

Effects of Vacuum Melting Atmosphere on Properties of Co-Cr-Mo Alloys

陳又賢(You-Sian Chen)

指導教授 ： 陳貞光 ； 劉沖明

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2011年)

摘要

鈷鉻鉬合金由於優異的耐腐蝕性、耐磨耗性以及良好的機械性能，因此被廣泛運用於植入材料，如髖關節，牙齒和膝蓋假體等用途。本研究利用高週波鑄造機製作鈷鉻鉬合金試片，分為通入氬氣與未通入氬氣等兩組氣氛條件進行鑄造，接著進行材料之顯微組織觀察、硬度和磨耗實驗。其中，通入氬氣製作的鈷鉻鉬合金，具有優於真空鑄造鈷鉻鉬合金的強度和耐磨耗性質。本研究利用掃描式電子顯微鏡(SEM)與X光繞射儀(XRD)以及穿透式電子顯微鏡(TEM)對鈷鉻鉬合金進行晶體結構與析出物分析，並觀察磨耗後之材料表面，探討HCP/ FCC相成份比值與磨耗特性的關係。結果顯示，在氬氣氣氛中鑄造的鈷鉻鉬合金能使微結構中HCP相比例增加，因此在硬度和耐磨耗特性上具有較佳的表現。

關鍵字

生醫材料 ； 鈷鉻鉬合金 ； 高週波鑄造機 ； 硬度 ； 耐磨耗性

並列摘要

Co-Cr-Mo alloys are widely used as implant materials for applications such as hip, tooth and knee prostheses due to their excellent mechanical, corrosion and wear resistance properties. In this study, Co-Cr-Mo alloys are cast using a high frequency induction heating system. Two different atmospheres, namely argon protection and vacuum atmospheres are employed to investigate their effects on properties of Co-Cr-Mo alloys. Higher hardness and better wear resistant properties are observed in the alloy prepared under argon atmosphere than the alloy prepared in vacuum. SEM, XRD and TEM are employed to investigate the microstructures of these alloys. Surface structures of grinding test specimens are also observed. The ratio of HCP and FCC phases appears to affect the properties of these alloys greatly. The higher HCP/FCC ratio obtained in specimen prepared under Ar is shown to have higher hardness and improved wear resistant properties.

並列關鍵字

Biomaterials ； Co-Cr-Mo alloys ； High frequency induction heating system ； Hardness ； wear-resistant properties

參考文獻

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