- 學位論文
鍍著於304不鏽鋼基材之氮氧化鋯薄膜相變化、機械性質與潤濕性研究
Phase Transition, Mechanical Properties and Wettability of Zr(N,O) thin films on AISI 304 stainless steel substrate
摘要
Nanocrystalline Zr(N,O) thin films were deposited on 304 stainless steel substrates using unbalanced magnetron sputtering (UBMS) system. The purpose of this study was to investigate the effect of oxygen flow rate (ranging from 0 to 2 sccm) on the composition, structure and properties of Zr(N,O) thin films. The oxygen contents of the thin films determined using X-ray Photoelectron Spectroscopy (XPS) increased significantly with increasing oxygen flow rate. From the observation of X-ray Diffraction (XRD), the dominant phases in the films were in a sequence of ZrN, c-Zr2ON2, and m-ZrO2 with increasing oxygen flow rate. The characteristics of the films can be divided into three zones: Zone I (ZrN), Zone II (Zr2ON2) and Zone III (m-ZrO2). Modified XRD sin2ψ method was used to respectively measure the residual stresses of ZrN, Zr2ON2 and m-ZrO2 phases. The residual stress in ZrN was relieved as the oxygen content increased. Zr2ON2 and m-ZrO2 were found to be low residual stress phases. The hardness of the Zr(N,O) films decreased with increasing the oxygen content due to the formation of the soft oxide phase. AES analysis show ed that there existed a ZrO2 interlayer between the Zr(N,O) film and the substrates for those samples deposited using O2/N2 mixing gas. Contact angle was used as an index to assess the wettability of the film on substrate. The contact angle was calculated from the measured surface energies of the related materials. The result of the contact angles revealed the lowest wettability between ZrO2 and SS304. This results showed well-correlated to those of the salt spray tests, indicating that the ZrO2 interlayer may account for the spallation of the Zr(N,O) films after salt spray tests.
並列摘要
本實驗使用非平衡磁控濺鍍系統，於304不鏽鋼基材製備奈米晶氮氧化鋯薄膜。在本研究中，將探討氧氣流量（自0到2 sccm）對氮氧化鋯薄膜的成分、結構以及性質之影響。藉由Ｘ光光電子能譜儀量測到氮氧化鋯薄膜的氧含量，隨著氧氣流量增加而明顯增加。從ｘ光繞射圖的觀察中則發現，伴隨著氧含量的增加，薄膜的主要相出現之順序為：面心立方晶之氮化鋯（ZrN），立方晶之氮氧化鋯（Zr2ON2），最後是單斜晶之二氧化鋯(ZrO2)，由這些薄膜的特徵可以將試片分為三區，各區分別以氮化鋯(Zone I)、氮氧化鋯(Zone II)、及二氧化鋯 (Zone III)為主相。使用改良式X光繞射之sin2ψ的方法來量測氮化鋯、氮氧化鋯及二氧化鋯個別相的殘餘應力，氮化鋯的殘餘應力隨著氧含量上升而得到釋放，而氮氧化鋯及二氧化鋯則為低應力相。氮氧化鋯薄膜之硬度因為隨著氧含量增加形成較軟的氧化相而下降。在歐傑電子能譜儀(ＡＥＳ)的分析中，發現所有通氧的試片存在著一層氧化鋯介層。本研究中，使用兩種材料間的接觸角來作為材料間可濕性的指標，接觸角是由材料的表面能計算所得，使用接觸角的方法發現，二氧化鋯在304不鏽鋼的附著性不佳，此結果說明鹽霧試驗之後，氮氧化鋯薄膜從基板上碎裂可能是由於二氧化鋯介層的影響。