现代金属切削加工正向着高速、高精度和高效的方向发展,对刀具的性能有着越来越高的要求。利用表面技术对刀具表面进行改性,是提高刀具性能和寿命的有效途径。使用多弧离子镀膜技术在YG6硬质合金以及三刃立铣刀表面制备了Cr Al N/CrN/Cr...现代金属切削加工正向着高速、高精度和高效的方向发展,对刀具的性能有着越来越高的要求。利用表面技术对刀具表面进行改性,是提高刀具性能和寿命的有效途径。使用多弧离子镀膜技术在YG6硬质合金以及三刃立铣刀表面制备了Cr Al N/CrN/Cr、TiAlN/CrN/Cr、Cr Al N/TiAlN/CrN/Cr三组涂层,并对三种涂层的制备技术、微观结构与性能差异、及耐磨与切削寿命提高机制进行研究。X射线衍射分析表明,三种涂层均为面心立方结构,其中TiAlN涂层表现出(200)晶面择优取向,而CrAlN和Cr Al N/TiAlN涂层则表现出(111)面的择优取向。使用显微硬度计和划痕仪对涂层的显微硬度和结合力进行测试,结果表明Cr Al N/TiAlN多层涂层的显微硬度和膜基结合力分别为2651 HV和59.2 N,显著高于TiAlN和CrAlN涂层。采用高温摩擦试验机评价了三种涂层的摩擦学性能,结果表明Cr Al N/TiAlN多涂层的摩擦性能优于TiAlN涂层和CrAlN涂层,室温下其平均摩擦因数和磨损率分别为0.603和2.92×10^(-6)mm^(3)(N·m)^(-1)。当温度增加到400℃时,Cr Al N/TiAlN涂层的平均摩擦因数进一步降低为0.467,磨损率增加至1.31×10^(-5)mm^(3)(N·m)^(-1)。铣削试验结果显示,TiAlN涂层刀具、CrAlN涂层刀具和Cr Al N/TiAlN涂层刀具的铣削寿命相对于无涂层刀具分别提升了80%、140%和200%,被加工样件的表面粗糙度分别降低至462 nm、415 nm和402 nm。研究结果表明Cr Al N/TiAlN涂层在现代切削加工领域有着良好的应用潜力。展开更多
This study investigates the interfacial adhesion enhancement mechanisms of TiAlN coatings deposited on nitrocarburized 300M ultra-high-strength steel substrates.Through radio frequency(RF)magnetron sputtering technolo...This study investigates the interfacial adhesion enhancement mechanisms of TiAlN coatings deposited on nitrocarburized 300M ultra-high-strength steel substrates.Through radio frequency(RF)magnetron sputtering technology,TiAlN coatings(approximately 4μm thick)are fabricated on both pristine and plasma-nitrocarburized(PNC)substrates.Comparative analyses of phase composition,microstructure,and mechanical properties are conducted using field emission scanning electron microscope(FESEM),X-ray diffraction(XRD),nanoindentation,and scratch testing.Molecular dynamics(MD)simulations with Materials Studio(MS)software elucidate atomicscale interactions between TiAlN coatings and substrates.Results demonstrate that the PNC pretreatment generates a dual-phase structure(about 65μm thick)comprising theγ-Fe4N compound layer and a high-hardness diffusion layer,establishing a continuous hardness gradient at the coating-substrate interface.The PNC/TiAlN composite coating exhibits enhanced interfacial adhesion strength,attributed to mechanical interlocking from plasma-etched microvoids and optimized lattice matching.Scratch tests reveal a significant increase in critical load to 60 N for coating delamination in PNC/TiAlN systems compared with monolayer coatings.These improvements mitigate brittle spallation risks while maintaining superior hardness(29.26 GPa)and wear resistance.This paper provides atomiclevel insights into adhesion enhancement mechanisms and proposes a viable duplex surface engineering strategy for high-strength steel components.展开更多
TiN/TiAlN multilayer coatings were prepared by arc ion plating with separate targets. In order to decrease the unfavorable macroparticles, a straight magnetized filter was used for the low melting aluminium target. Th...TiN/TiAlN multilayer coatings were prepared by arc ion plating with separate targets. In order to decrease the unfavorable macroparticles, a straight magnetized filter was used for the low melting aluminium target. The results show that the output plasmas of titanium target without filter and aluminium target with filter reach the substrate with the same order of magnitude. Meanwhile, the number of macropartieles in TiN/TiAlN multilayer coatings deposited with separate targets is only 1/10-1/3 of that deposited with alloy target reported in literature. Al atom addition may lead to the decrease of peak at （200） lattice plane and strengthening of peak at （111） and （220） lattice planes. The measured hardness of TiN/TiAlN multilayer coatings accords with the mixture principle and the maximum hardness is HV2495. The adhesion strength reaches 75 N.展开更多
文摘现代金属切削加工正向着高速、高精度和高效的方向发展,对刀具的性能有着越来越高的要求。利用表面技术对刀具表面进行改性,是提高刀具性能和寿命的有效途径。使用多弧离子镀膜技术在YG6硬质合金以及三刃立铣刀表面制备了Cr Al N/CrN/Cr、TiAlN/CrN/Cr、Cr Al N/TiAlN/CrN/Cr三组涂层,并对三种涂层的制备技术、微观结构与性能差异、及耐磨与切削寿命提高机制进行研究。X射线衍射分析表明,三种涂层均为面心立方结构,其中TiAlN涂层表现出(200)晶面择优取向,而CrAlN和Cr Al N/TiAlN涂层则表现出(111)面的择优取向。使用显微硬度计和划痕仪对涂层的显微硬度和结合力进行测试,结果表明Cr Al N/TiAlN多层涂层的显微硬度和膜基结合力分别为2651 HV和59.2 N,显著高于TiAlN和CrAlN涂层。采用高温摩擦试验机评价了三种涂层的摩擦学性能,结果表明Cr Al N/TiAlN多涂层的摩擦性能优于TiAlN涂层和CrAlN涂层,室温下其平均摩擦因数和磨损率分别为0.603和2.92×10^(-6)mm^(3)(N·m)^(-1)。当温度增加到400℃时,Cr Al N/TiAlN涂层的平均摩擦因数进一步降低为0.467,磨损率增加至1.31×10^(-5)mm^(3)(N·m)^(-1)。铣削试验结果显示,TiAlN涂层刀具、CrAlN涂层刀具和Cr Al N/TiAlN涂层刀具的铣削寿命相对于无涂层刀具分别提升了80%、140%和200%,被加工样件的表面粗糙度分别降低至462 nm、415 nm和402 nm。研究结果表明Cr Al N/TiAlN涂层在现代切削加工领域有着良好的应用潜力。
基金supported by the National Major Science and Technology Projects of China(No.Y2022-Ⅲ-0004-0013)the National Natural Science Foundation of China(No.52272065)+3 种基金the Sicence and Technology Plan Project of Suzhou City(N0.SZKXM202301)the Technical Service Project of Suzhou University(No.2024xhx 140)the Suzhou University Doctoral Research Foundation(No.2023BSK013)the Natural Science Research Project in the Universities of Anhui Province(No.2023AH053390).
文摘This study investigates the interfacial adhesion enhancement mechanisms of TiAlN coatings deposited on nitrocarburized 300M ultra-high-strength steel substrates.Through radio frequency(RF)magnetron sputtering technology,TiAlN coatings(approximately 4μm thick)are fabricated on both pristine and plasma-nitrocarburized(PNC)substrates.Comparative analyses of phase composition,microstructure,and mechanical properties are conducted using field emission scanning electron microscope(FESEM),X-ray diffraction(XRD),nanoindentation,and scratch testing.Molecular dynamics(MD)simulations with Materials Studio(MS)software elucidate atomicscale interactions between TiAlN coatings and substrates.Results demonstrate that the PNC pretreatment generates a dual-phase structure(about 65μm thick)comprising theγ-Fe4N compound layer and a high-hardness diffusion layer,establishing a continuous hardness gradient at the coating-substrate interface.The PNC/TiAlN composite coating exhibits enhanced interfacial adhesion strength,attributed to mechanical interlocking from plasma-etched microvoids and optimized lattice matching.Scratch tests reveal a significant increase in critical load to 60 N for coating delamination in PNC/TiAlN systems compared with monolayer coatings.These improvements mitigate brittle spallation risks while maintaining superior hardness(29.26 GPa)and wear resistance.This paper provides atomiclevel insights into adhesion enhancement mechanisms and proposes a viable duplex surface engineering strategy for high-strength steel components.
基金Projects (50773015, 10775036) supported by the National Natural Science Foundation of China
文摘TiN/TiAlN multilayer coatings were prepared by arc ion plating with separate targets. In order to decrease the unfavorable macroparticles, a straight magnetized filter was used for the low melting aluminium target. The results show that the output plasmas of titanium target without filter and aluminium target with filter reach the substrate with the same order of magnitude. Meanwhile, the number of macropartieles in TiN/TiAlN multilayer coatings deposited with separate targets is only 1/10-1/3 of that deposited with alloy target reported in literature. Al atom addition may lead to the decrease of peak at （200） lattice plane and strengthening of peak at （111） and （220） lattice planes. The measured hardness of TiN/TiAlN multilayer coatings accords with the mixture principle and the maximum hardness is HV2495. The adhesion strength reaches 75 N.
