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Tribological properties of laser cladding TiB_2 particles reinforced Ni-base alloy composite coatings on aluminum alloy

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Rare Metals 2015年第11期34卷 789-796页

作者： Long He ye-fa tan Xiao-Long Wang Qi-Feng Jing Xiang Hong College of Field Engineering PLA University of Science and Technology

To improve the wear resistance of aluminum alloy frictional parts, Ti B2particles reinforced Ni-base alloy composite coatings were prepared on aluminum alloy 7005 by laser cladding. The microstructure and tribological properties of the composite coatings were investigated. The results show that the composite coating contains the phases of Ni Al, Ni3Al, Al3Ni2, TiB2, TiB, TiC, CrB, and *** microhardness is HV0.5855.8, which is 15.4 % higher than that of the Ni-base alloy coating and is 6.7 times as high as that of the aluminum alloy. The friction coefficients of the composite coatings are reduced by 6.8 %–21.6 % and 13.2 %–32.4 % compared with those of the Ni-base alloy coatings and the aluminum alloys, while the wear losses are 27.4 %–43.2 % less than those of the Ni-base alloy coatings and are only 16.5 %–32.7 % of those of the aluminum alloys at different loads. At the light loads ranging from 3 to 6 N, the calculated maximum contact stress is smaller than the elastic limit contact stress. The wear mechanism of the composite coatings is micro-cutting wear, but changes into multi-plastic deformation wear at 9 N due to the higher calculated maximum contact stress than the elastic limit contact stress. As the loads increase to 12 N, the calculated flash temperature rises to 332.1 °*** composite coating experiences multi-plastic deformation wear, micro-brittle fracture wear, and oxidative wear.

关键词： Ti B2 Ni-base alloy Laser cladding Composite coati

Effects of process parameters on microstructure and wear resistance of TiN coatings deposited on TC11 titanium alloy by electrospark deposition

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Transactions of Nonferrous Metals Society of China 2017年第8期27卷 1767-1776页

作者： Xiang HONG Ke FENG ye-fa tan Xiao-long WANG Hua tan College of Field Engineering PLA University of Science and Technology Nanjing 210007 China

In the present study,the effects of process parameters(output voltage x,nitrogen flux l and specific strengthening time s)on the microstructure and wear resistance properties of TiN coatings prepared by electrospark deposition(ESD)were *** microstructure of the coatings was characterized for thickness(TOC),content of TiN(CON)and porosity(POC).A statistical model was developed to identify the significant factors affecting the microstructure and wear resistance of the *** results show that the output voltage x and nitrogen flux l present significant effects on majority of the evaluation indexes such asTOC,friction coefficient(COF)and wear mass loss(Id),while the specific strengthening time s has a significant effect on POC and asmall effect on the other *** optimal process parameters were obtained as follows:output voltage(x,60V),nitrogen flux(l,15L/min)and specific strengthening time(s,3min/cm2).The variation of wear mass loss(Id)by the variation of the outputvoltage(x)and nitrogen flux(l)is attributed to the change of wear mechanisms of TiN *** main wear mechanism of TiNcoating prepared under optimal process parameters is micro-cutting wear accompanied by micro-fracture wear.

关键词： electrospark deposition (ESD) TiN coating wear resistance statistical model process parameters

TiC颗粒增强镍基合金复合涂层的摩擦学性能(英文)

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中国有色金属学会会刊：英文版 2013年第6期23卷 1681-1688页

作者：蔡滨谭业发何龙谭华高立解放军理工大学野战工程学院南京210007

运用等离子喷涂技术制备了TiC颗粒增强镍基合金复合涂层,分析了TiC颗粒增强镍基合金复合涂层的微观结构,研究了其摩擦磨损行为与机理。结果表明:TiC颗粒增强镍基合金复合涂层主要由γ-Ni,CrB,Cr7C3和TiC构成;复合涂层与基底材料间形成... 详细信息

运用等离子喷涂技术制备了TiC颗粒增强镍基合金复合涂层,分析了TiC颗粒增强镍基合金复合涂层的微观结构,研究了其摩擦磨损行为与机理。结果表明:TiC颗粒增强镍基合金复合涂层主要由γ-Ni,CrB,Cr7C3和TiC构成;复合涂层与基底材料间形成了厚度为9.4μm的过渡层,达到了冶金结合。当TiC颗粒含量为30%(体积分数)时,复合涂层的摩擦系数和磨损率均最低,即其摩擦系数为0.33,较纯镍基合金涂层降低了30%;其磨损率为0.3×10-3mm3/m,是纯镍基合金涂层的1/3。当载荷在6～10N的范围内时,复合涂层呈轻微磨损,其磨损机理主要为粘着磨损;当载荷达到12N时,复合涂层产生严重磨损,其磨损机制转变为硬质相的脱落和转移层的层脱剥落。

关键词：等离子喷涂复合涂层 TiC颗粒镍基合金摩擦与磨损

Tribological properties of nanostructured Al_2O_3-40%TiO_2 multiphase ceramic particles reinforced Ni-based alloy composite coatings

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Transactions of Nonferrous Metals Society of China 2013年第9期23卷 2618-2627页

作者：何龙谭业发谭华周春华高立解放军理工大学工程兵工程学院南京210007

The Ni-based alloy composite coatings reinforced by nanostructured Al2O3-40%TiO2 multiphase ceramic particles were prepared on the surface of 7005 aluminum alloy by plasma spray technology. The microstructure and tribological properties of the composite coatings were researched. The results show that the composite coatings mainly consist of γ-Ni, α-Al2O3, γ-Al2O3 and rutile-TiO2 etc, and exhibit lower friction coefficients and wear losses than the Ni-based alloy coatings at different loads and speeds. The composite coating bears low contact stress at 3 N and its wear mechanism is micro-cutting wear. As loads increase to 6-12 N, the contact stress is higher than the elastic limit stress of worn surface, and the wear mechanisms change into multi-plastic deformation wear, micro-brittle fracture wear and abrasive wear. With the increase of speeds, the contact temperature of worn surface increases. The composite coating experiences multi-plastic deformation wear, fatigue wear and adhesive wear.

关键词： nanostructured A1203-TiO2 multiphase ceramic particles Ni-based alloy composite coating plasma spray friction wear

Tribological behavior and mechanisms of graphite/CaF_2/TiC/Ni-base alloy composite coatings

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Transactions of Nonferrous Metals Society of China 2013年第2期23卷 392-399页

作者：蔡滨谭业发何龙谭华王小龙解放军理工大学野战工程学院南京210007

In order to reduce the friction coefficients and improve the wear resistance of mechanical parts, which work in the severe friction and wear conditions at heavy loads, the graphite/CaFg/TiC/Ni-base alloy composite coatings were prepared by plasma spray and their tribological behavior and mechanisms were investigated. The results show that the friction coefficients of the composite coatings are in the range of 0.22-0.288, which are reduced by 25.9% to 53% compared with those of the pure Ni-base alloy coatings, and the wear rates of the former are 18.6%-70.1% less than those of the latter. When wear against GCr15 steel balls, a transferred layer mainly composed of ferric oxides, graphite and CaF2 may gradually develop on the worn surface of the composite coatings, which made the friction and wear between GCr15 steel ball and the composite coatings change into that between the former and the transferred layer. So the friction coefficients and the wear lubrication effect of the transferred layer. The main wear layer in friction process. rates of the composite coatings are greatly reduced because of the solid mechanism of the composite coatings is delamination of the transferred

关键词： plasma spray composite coatings Ni-base alloy graphite TiC CaF2 tribology

Effects of nitrogen flux on microstructure and tribological properties of in-situ TiN coatings deposited on TC11 titanium alloy by electrospark deposition

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Transactions of Nonferrous Metals Society of China 2015年第10期25卷 3329-3338页

作者：洪翔谭业发王小龙谭华徐婷解放军理工大学野战工程学院南京21000

In order to improve the tribological properties of titanium alloys,the in-situ TiN coatings were prepared by electrospark deposition（ESD） on the surface of TC11 titanium *** effects of nitrogen flux on the microstructure and tribological properties of TiN coatings were *** results show that the coating is relative thin when the nitrogen flux is small and mainly consists of Ti2N,α-Ti,Ti O and TiN phases,and the metastable phase of Ti2N is developed due to the rapid solidification of *** in excessive nitrogen flux condition,many micro-cracks and holes might be generated in the *** moderate nitrogen flux,the coating is mainly composed of TiN phase,and is dense and uniform（50-55 μm）.The average hardness is HV0.2 1165.2,which is 3.4 times that of the TC11 *** TiN coatings prepared in moderate nitrogen flux perform the best wear *** wear loss of the coating is 0.4 mg,which is 2/9 that of the TC11 *** main wear mechanisms of the coatings are micro-cutting wear accompanied by multi-plastic deformation wear.

关键词： titanium alloy TiN coating electrospark deposition friction and wear

Tribological behavior and mechanism of NiCrBSi-Y_2O_3 composite coatings

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Transactions of Nonferrous Metals Society of China 2013年第7期23卷 2002-2010页

作者：蔡滨谭业发谭华敬奇锋张中威解放军理工大学野战工程学院南京210007

The NiCrBSi-Y2O3 composite coatings were prepared on the surface of 45 carbon steel by plasma spray, the microstructure and tribological properties of the coatings were investigated. The results show that the NiCrBSi-Y2O3 composite coatings are mainly composed of γ-Ni, CrB, Cr7C3 and Y2O3. With addition of Y2O3, hard phases such as CrB, Cr7C3 emerge in composite coating, and the density of the composite coatings also increases. The NiCrBSi-0.5Y2O3 composite coating presents excellent tribological properties. Its friction coefficient is 0.175, which is about 37% of that of the pure NiCrBSi coating. The mass wear loss is 1.2 mg, which is reduced by 43% compared with the pure NiCrBSi coating. When the loads are 6-10 N, the NiCrBSi-0.5Y2O3 composite coating suffers from slight wear and the wear mechanisms are mainly adhesive wear accompany with slight micro-cutting wear and micro-fracture wear. As the load increases to 12 N, the wear mechanisms are adhesive wear and severe micro-cutting wear.

关键词： plasma spray composite coating NiCrBSi Y2O3 friction wear

碳纤维传动轴刚度不平衡胶接接头的失效行为研究

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玻璃钢／复合材料 2017年第9期 52-57页

作者：洪涛胡业发谭建刘灿朱勇武汉理工大学机电工程学院武汉430070 上汽通用五菱汽车股份有限公司技术中心柳州545000

建立了碳纤维传动轴刚度不平衡胶接接头的有限元模型,对扭转载荷下刚度不平衡胶接接头的失效行为进行分析,预测了胶接接头的失效扭矩和失效模式,并进行扭转实验证明有限元分析方法的有效性,最后研究了被粘物剪切模量比和壁厚比对刚度不... 详细信息

建立了碳纤维传动轴刚度不平衡胶接接头的有限元模型,对扭转载荷下刚度不平衡胶接接头的失效行为进行分析,预测了胶接接头的失效扭矩和失效模式,并进行扭转实验证明有限元分析方法的有效性,最后研究了被粘物剪切模量比和壁厚比对刚度不平衡胶接接头失效行为的影响,为工程上碳纤维传动轴胶接接头的设计提供了参考。

关键词：碳纤维传动轴胶接接头刚度不平衡失效行为

Tribological properties and wear prediction model of TiC particles reinforced Ni-base alloy composite coatings

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Transactions of Nonferrous Metals Society of China 2014年第8期24卷 2566-2573页

作者：谭业发何龙王小龙洪翔王伟刚解放军理工大学野战工程学院南京210007

TiC particles reinforced Ni-based alloy composite coatings were prepared on 7005 aluminum alloy by plasma spray. The effects of load, speed and temperature on the tribological behavior and mechanisms of the composite coatings under dry friction were researched. The wear prediction model of the composite coatings was established based on the least square support vector machine (LS-SVM). The results show that the composite coatings exhibit smaller friction coefficients and wear losses than the Ni-based alloy coatings under different friction conditions. The predicting time of the LS-SVM model is only 12.93%of that of the BP-ANN model, and the predicting accuracies on friction coefficients and wear losses of the former are increased by 58.74%and 41.87%compared with the latter. The LS-SVM model can effectively predict the tribological behavior of the TiCP/Ni-base alloy composite coatings under dry friction.

关键词： TiC particles Ni-based alloy composite coating least square support vector machine(LS-SVM) wear prediction model