Cr2O3/CrN超硬複層膜之耐鋁湯熱損性研究

An Investigation of Thermal Loss of Cr2O3/CrN Duplex Coatings Corroded by Molten Aluminum

何偉友(W. Y. Ho) ； 許正勳(C. H. Hsu) ； 黃東浩(T. H. Huang)

《材料科學與工程》 36卷4期 (2004/12) Pp. 203-209

https://doi.org/10.6409/JMSE.200412.0203

摘要

一般鋁壓鑄模具與熔融金屬接觸常引發模具表面產生熱熔損的問題，利用PVD技術所得到的TiN及CrN鍍膜，雖然具良好抗磨耗和硬度性質，但是應用在鋁壓鑄模具上仍有缺點。本研究中，我們以鋁壓鑄模具材料為基材，並利用陰極電弧沈積(Cathodic arc deposition, CAD)法在試片表面沈積厚度3μm之Cr2O3/CrN超硬複層膜，來評估此製程之膜層對高溫鋁合金之抗熔損性行為。本實驗以SEM觀察試片破斷面型態和厚度，且利用XRD、XPS、ESCA分別對膜層進行結構鑑定，同時進行磨耗測試以及高溫鋁熔液浸蝕試驗。實驗結果發現，Cr2O3/CrN複合鍍層相較於單層CrN有較低的摩擦係數，且對A356鋁湯具良好的抗蝕性，對模具的使用壽命應有明顯的提昇。

關鍵字

陰極電弧沈積 ； Cr2O3/CrN複合鍍層 ； 浸蝕試驗

並列摘要

When applied to cast Al-alloy melt into molded parts, aluminum die casting was always faced harsh conditions, such as corrosion, erosion and surface damage problems. PVD coatings such as TiN and CrN have not been successfully applied to die casting industries so far even though these coatings possess excellent wear resistance and hardness properties. In this study, we evaluated Cr2O3/CrN duplex coating synthesized by PVD cathodic arc deposition (CAD) processes for potential applications in molding dies Cr2O3/CrN thin films were controlled at the thickness of 3μm Scanning electron microscopy (SEM) was used to investigate the cross section and thickness. X-ray diffraction (XRD). XPS and ESCA were used to analyze their microstructure. Wear tests, and molten Al alloy immersion tests were also conducted to evaluate the performance of Cr2O3/CrN thin films. The results demonstrated low frictional coefficient of Cr2O3/CrN thin films and excellent corrosion resistance in Al alloy melt There has been interest in applying such coatings to the molding dies in older to prolong the die life

並列關鍵字

Cathodic arc deposition ； Cr2O3/CrN duplex coatings ； Immersion test