目的探究Cr/CrN/Cr/CrAlN多层膜的最佳调制比。方法利用电弧离子镀技术,在TC4钛合金上制备了不同调制比的Cr/CrN/Cr/CrAlN多层膜。利用扫描电子显微镜观察膜层表面和截面形貌;用Image-Pro分析软件对表面的大颗粒进行定量分析;利用X射线...目的探究Cr/CrN/Cr/CrAlN多层膜的最佳调制比。方法利用电弧离子镀技术,在TC4钛合金上制备了不同调制比的Cr/CrN/Cr/CrAlN多层膜。利用扫描电子显微镜观察膜层表面和截面形貌;用Image-Pro分析软件对表面的大颗粒进行定量分析;利用X射线衍射法表征膜层的晶体结构;采用维氏硬度计测量膜层的显微硬度;采用划痕试验仪测量膜层与基体之间的结合力(临界载荷);通过基片弯曲法测量并计算得到膜层的残余应力;利用根据ASTM G76-05标准特制的AS600-喷砂试验机进行了抗冲蚀性能测试;采用三维表面轮廓仪测量冲蚀坑深度。结果膜层表面质量和生长取向与L_(Cr/CrN):L_(Cr/CrAlN)调制比密切相关,随着Cr/CrN比例的增加,膜层表面质量越来越好,择优取向由(111)晶面转为(200)晶面。多层膜的硬度随Cr/CrN比例的增加,呈下降趋势,结合力、残余应力和韧性则随之呈先升后降的趋势,并在L_(Cr/CrN)∶LCr/Cr Al N为1∶2时,达到最佳。多层膜的抗砂粒冲蚀性能变化与力学性能变化一致,在L_(Cr/CrN)∶L_(Cr/CrAlN)为1∶2时达到最佳,其抗冲蚀能力是TC4基材的3倍以上,多层膜呈典型的脆性断裂失效形式。结论在调制比L_(Cr/CrN)∶L_(Cr/CrAlN)=1∶2时,膜层获得最佳的抗冲蚀性能。展开更多
Cr/CrN multilayer coatings with bilayer periods in the range from 1351 to 260 nm were prepared on 304 stainless steel substrates by arc ion plating to study the microstructure and properties of multilayer coatings and...Cr/CrN multilayer coatings with bilayer periods in the range from 1351 to 260 nm were prepared on 304 stainless steel substrates by arc ion plating to study the microstructure and properties of multilayer coatings and stimulate their application.SEM results confirm the clear periodicity of the Cr/CrN multilayer coatings and the clear interface between individual layers.XRD patterns reveal that these multilayer coatings contain Cr,CrN and Cr_2N phases.Because Cr layer is softer than its nitride layer,the hardness decreases with the shortening of the bilayer period(or increasing volume fraction of Cr layer).The Cr/CrN multilayer coating with 862 nm period possesses the highest indentation toughness due to a proper individual Cr and nitride layer thickness.However,for the Cr/CrN multilayer with the bilayer period of 1351 nm,it possesses the lowest toughness due to more nitride phase.The indentation toughness of Cr/CrN multilayer coatings is related with their bilayer period.A coating with a proper individual Cr and nitride layer thickness possesses the highest indentation toughness.展开更多
文摘目的探究Cr/CrN/Cr/CrAlN多层膜的最佳调制比。方法利用电弧离子镀技术,在TC4钛合金上制备了不同调制比的Cr/CrN/Cr/CrAlN多层膜。利用扫描电子显微镜观察膜层表面和截面形貌;用Image-Pro分析软件对表面的大颗粒进行定量分析;利用X射线衍射法表征膜层的晶体结构;采用维氏硬度计测量膜层的显微硬度;采用划痕试验仪测量膜层与基体之间的结合力(临界载荷);通过基片弯曲法测量并计算得到膜层的残余应力;利用根据ASTM G76-05标准特制的AS600-喷砂试验机进行了抗冲蚀性能测试;采用三维表面轮廓仪测量冲蚀坑深度。结果膜层表面质量和生长取向与L_(Cr/CrN):L_(Cr/CrAlN)调制比密切相关,随着Cr/CrN比例的增加,膜层表面质量越来越好,择优取向由(111)晶面转为(200)晶面。多层膜的硬度随Cr/CrN比例的增加,呈下降趋势,结合力、残余应力和韧性则随之呈先升后降的趋势,并在L_(Cr/CrN)∶LCr/Cr Al N为1∶2时,达到最佳。多层膜的抗砂粒冲蚀性能变化与力学性能变化一致,在L_(Cr/CrN)∶L_(Cr/CrAlN)为1∶2时达到最佳,其抗冲蚀能力是TC4基材的3倍以上,多层膜呈典型的脆性断裂失效形式。结论在调制比L_(Cr/CrN)∶L_(Cr/CrAlN)=1∶2时,膜层获得最佳的抗冲蚀性能。
基金Project(51171118)supported by the National Natural Science Foundation of ChinaProject(2012-4)supported by the Liaoning Provincial Key Laboratory of Advanced Materials,Shenyang University,China
文摘Cr/CrN multilayer coatings with bilayer periods in the range from 1351 to 260 nm were prepared on 304 stainless steel substrates by arc ion plating to study the microstructure and properties of multilayer coatings and stimulate their application.SEM results confirm the clear periodicity of the Cr/CrN multilayer coatings and the clear interface between individual layers.XRD patterns reveal that these multilayer coatings contain Cr,CrN and Cr_2N phases.Because Cr layer is softer than its nitride layer,the hardness decreases with the shortening of the bilayer period(or increasing volume fraction of Cr layer).The Cr/CrN multilayer coating with 862 nm period possesses the highest indentation toughness due to a proper individual Cr and nitride layer thickness.However,for the Cr/CrN multilayer with the bilayer period of 1351 nm,it possesses the lowest toughness due to more nitride phase.The indentation toughness of Cr/CrN multilayer coatings is related with their bilayer period.A coating with a proper individual Cr and nitride layer thickness possesses the highest indentation toughness.
