汪逸安
,
李金许
,
乔利杰
金属学报
doi:10.3724/SP.J.1037.2011.00674
研究了电流及其极性对浸铜碳滑板摩擦磨损性能的影响. 利用SEM观察浸铜碳滑板磨损表面的形貌. 结果表明, 施加电流显著增加浸铜碳滑板的磨损量, 但降低摩擦系数. 浸铜碳滑板为正极时的磨损量比其为负极时的大, 而2种极性条件下的摩擦系数相近; 电流越大, 磨损表面损伤越严重; 正极磨损表面的氧化比负极剧烈. 磨损机理主要为磨粒磨损、黏着磨损和电弧烧蚀.
关键词:
电流
,
polarity
,
friction
,
wear
,
oxidation
胡智杰
物理测试
本文研究了Mo、Co、Nb等元素离子注入及薄膜沉积方法对TiN薄膜性能的影响。采用SRV磨损实验、表面形貌轮廓等方法研究分析了离子注入对TiN薄膜的摩擦系数、耐磨性能、显微硬度的影响规律。实验结果表明：磁过滤电弧镀的TiN薄膜的摩擦系数曲线与常规电弧镀TiN薄膜的摩擦系数曲线相差很大，且耐磨性能优于电弧镀TiN薄膜。采用离子注入可降低TiN薄膜的摩擦系数。在5N载荷磨损条件下，随注入剂量和注入元素的不同其摩擦系数变化较大。在30N载荷磨损条件下，样品摩擦系数均接近0.5。离子注入Mo、Co、Nb均可显著提高TiN薄膜的耐磨性，其中注入Mo的试样耐磨性最好。
关键词:
TiN
,
ion implantation
,
friction
,
wear
Liu Zhengyi Fu Jian Zhuang Yuzhi South China University of Technology
,
Guangzhou
,
China Correspondent:LIU Zhengyi professor
,
Dept.of Mechanical Engineering No.2
,
South China University of Technology
,
Guangzhou
,
China
金属学报(英文版)
The nature of“white layer”found in 55SiMnMo steel subjected to friction test has been stu- died using TEM,SEM,X-ray diffraction and EPMA techniques.It is shown that the struc- ture of the“white laver”on the rubbing surface is duplex,consisting of a special martensite and some austenite.This layer may be 25—50 μm thick.It is ultrafine,with grain diametric approximately 30 nm.Its micro-hardness may be as high as Hm 1500 and is capable of cut- ting glass.It has superb corrosion resistance and resists tempering.Its mierostructure and hardness undergo changes only when the steel is tempered above 500℃.
关键词:
friction
,
null
,
null
Y. H. Li
,
M. Krzyzanowski
,
J. H. Beynon and C. M. Sellars IMMPETUS( Institute for Microstructural and Mechanical Process Engineering: The University of Sheffield
,
Sheffield SI 3JD
,
UK)
金属学报(英文版)
In the last few years,substantial experimental simulation and mumerical modelling hare been carried out in IMMPETUS to characterise the interfacial heat transfer and friction conditions during hot forging and rolling of steels. Emphasis has been placed on the influence of the oxide scale which forms on the steel workpiece. In the present paper, the experimental methods used for investigating interfacial heat transfer and friction conditions are described. Theses include hot flat rolling of steel slabs and hot axi- symmetric forging of steel cylinders and rings.Temperature measurements and computations demon- strate that for similar conditions, similar conditions, the effective interfacial heat transfer coefficients (IHTC) derived for hot rolling are significantly higher than those for forging, mainly due to the contribution of scale cracking during rolling. On the basis of experimental observations and numerical analysis,physical models for interfacial heat transfer in forging and rolling have been established. In addition, hot" sandwich" rolling and hot tensile tests with finite element modelling have been carried out to evaluate the hot ductility of the oxide scale.The results indicate that the defomation, cracking and decohesion behaviour of the oxide scale depend on deformation temperature, strain and relative strengths of the scale layer and scale - steel interface.Finaly, friction results from hot ring compression tests and from hot rolling with forward/backward slip measurements are reported.
关键词:
interfacial heat transfer
,
null
,
null
,
null
,
null
,
null
HUANG Yi BAI Yuankai XU Jun LIN Xuerong Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China HUANG Yi
,
Associate Proessor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The change of temperature field on the friction facing during contact wearing for 3 wear-resistant alloys:Co-Cr-Ni-Si,Co-Cr-Mo and Co-Cr-W has been monitored by the infrared sensing thermography.Their flash temperature of the wearing area was measured.
关键词:
Co-base alloy
,
null
,
null
,
null
汪鑫
,
李倩
,
薛龙建
中国材料进展
doi:10.7502/j.issn.1674-3962.2017.01.07
自然界中很多动物,如壁虎、甲虫和树蛙等,主要利用可逆的黏附力在各种表面爬行.研究发现这些动物脚趾上的特殊微纳柱状结构(刚毛、平滑结构等)起到了至关重要的作用.一方面,这些微纳柱状结构及其精细亚结构保证了动物脚趾能与接触表面形成很多有效接触点,从而形成足够强的黏附力.产生的黏附力甚至可达动物体重的200倍.另一方面,这些微纳结构又可以保证动物能从黏附的表面迅速脱离.这种黏附能力依赖于结构而非接触材料的表面化学组成的特性,具有极高的科研价值和应用前景.
关键词:
仿生材料
,
干态黏附
,
湿态黏附
,
摩擦
,
柱状阵列
,
聚合物
,
壁虎
刘舒婕
,
李文生
,
杨效田
,
何玲
,
王大锋
,
何艳艳
中国有色金属学报
在不同温度下对45号钢基材上制备的高铝青铜等离子喷焊层进行热扩散处理,研究喷焊层与基体之间元素扩散对喷焊层组织及摩擦性能的影响.采用OM、XRD、SEM、EDS分析喷焊层表面、界面组织结构及Fe、A1元素界面扩散;采用拉伸法测定喷焊层结合强度;采用销-盘式摩擦磨损试验机测试喷焊层摩擦磨损性能.结果表明:热扩散处理使喷焊层组织成分偏析情况得到改善;喷焊层的冶金结合带变宽,产生明显的元素扩散现象,在650℃热扩散处理之后喷焊层结合强度达448.93 MPa;480℃热扩散处理后的喷焊层摩擦性能最稳定、磨损量最低,硬、软质相形态分布及Fe元素含量两种摩擦性能影响因素达到有机结合,获得最佳的耐磨减摩性能;喷焊层经热扩散处理后磨损机制均为以磨粒磨损为主,局部存在粘着磨损及疲劳磨损.
关键词:
高铝青铜
,
组织
,
性能
,
热扩散
,
界面扩散
,
摩擦
,
磨损
胡志德
,
晏华
,
王雪梅
,
唐锐
,
张平
,
杨健健
功能材料
doi:10.3969/j.issn.1001-9731.2013.18.013
从磁流变液的配方设计入手,采用四球摩擦磨损实验机研究了不同类型的固体润滑剂对磁流变液摩擦性能的影响,并考察了固体润滑剂在不同触变剂体系和不同基础油体系磁流变液中的配伍性,记录了摩擦系数随时间的变化曲线。结果表明,无机层状结构类固体润滑剂和高分子化合物类固体润滑剂的加入均能有效地改善磁流变液的润滑性能,其中 MoS2在无机层状结构类固体润滑剂中的润滑效果最佳,氮化硼的润滑效果最差。固体润滑剂在以 Si O 2为触变剂的磁流变液体系中的减摩效果优于以高岭土为触变剂的磁流变液体系。与硅油磁流变液体系相比,在矿物油磁流变液体系中聚四氟乙烯和氮化硼能能起到明显的润滑效果,MoS2和石墨的润滑效果变弱。
关键词:
固体润滑剂
,
磁流变液
,
触变剂
,
基础油
,
摩擦
