电弧喷涂锡基巴氏合金层的磨损性能

针对电弧喷涂巴氏合金涂层组织的特殊性,研究在润滑条件下巴氏合金涂层的摩擦磨损性能,对该涂层的工程应用具有重要的参考价值.利用环块摩擦磨损试验分别对比了电弧喷涂、铸造以及堆焊方法制备的巴氏合金层与碳钢和铸铁构成摩擦副的磨损表现.借助于扫描电子显微镜、x 射线能谱以及x 射线衍射,分析了巴氏合金涂层的微观组织结构和磨损表面形貌,研究了其组织变化与耐磨性能之间的关系.实验结果表明：在润滑条件下,电弧喷涂巴氏合金涂层具有比铸造巴氏合金更好的减磨性能;选择合适的工艺参数可以制备组织致密、结合强度高,且具有很好磨损性能的巴氏合金涂层.     

M2高速钢强脉冲离子束表面改性及其耐磨耐蚀性

针对陶瓷梯度涂层性能优良,在大气氛围下等离子喷涂制备涂层会受到空气氧化这一情况,在可控气氛（Ar气）中采用等离子喷涂的方法制取了NiCrBSi/Al₂O₃的梯度涂层,并且与大气条件下制取的NiCrBSi/Al₂O₃的梯度涂层进行对比.借助扫描电子显微镜（SEM）、x 射线衍射仪（XRD）对涂层的组织分布、相结构进行分析.结果表明：在Ar气和大气中梯度涂层的组织内部都没有明显的界面,实现了组织的连续变化;在Ar气中制取的梯度涂层的组织更加致密,被氧化的程度更低,质量更好.     

Wear Performance of Laser Surface Hardened GCr15 Steel

In order to assess the new tribological properties of laser surface hardened GCr15 steel, the wear resistance between specimens treated with laser and those of conventionally hardened under dry sliding conditions was compared. The change of wear mechanisms in laser hardened GCr15 resulted in a distinct difference in wear rates. The results showed that quenched zones not only had sufficient depth of hardening and higher hardness, but had more retained austenite and finer carbides because of a higher degree o...     

近α钛合金砂带磨削的磨粒磨损研究

针对锆刚玉磨料砂带和近α钛合金工件材料的特点,通过三维体式显微镜对锆刚玉磨料砂带干式磨削近α钛合金时的磨粒磨损面积、磨粒高度、磨损量和金属去除量进行了研究;同时采用扫描电子显微镜和能量分散光谱扫描对磨粒磨损形态进行研究;并分析不同磨粒磨损阶段对磨削工件表面的影响。研究表明:磨粒磨损形态有脱落,磨耗和破碎,主要以磨耗磨损为主;砂带线速度vs、进给速度vw和磨削深度ap增大均使砂带磨粒磨损加剧。在低切削速度、低进给量、低切削深度下锆刚玉磨料砂带加工钛合金时的切削加工性最好,因此锆刚玉磨料砂带适用于钛合金的干式磨削加工。     

抽油杆多功能保护器的研制

油田进入高含水开发后期,低沉没度井数不断增加,油田地质条件日趋恶劣,油套管柱扭曲变形,抽油井的杆管工况恶化,杆管偏磨问题日益突出。鉴于此,研制开发了DCB-22型抽油杆多功能保护器。该工具具有中途吸震、自磨、自动旋转、自动偏移的功能,较好地解决了杆管偏磨、抽油杆柱震荡和脱扣等问题,在杆管偏磨防治技术方面取得了较大的进展和较好的经济效益。     

四辊冷轧机基于机理与工况相结合的工作辊磨损模型研究

在大量的现场试验与理论研究的基础上,充分考虑到冷轧生产过程中的设备与工艺特点,将磨损机理与轧制过程中实际磨损数据的测量结果有机结合,建立了一套既考虑机理又考虑工况、不但适用于对称磨损而且适用于不对称磨损的工作辊预报模型,并将其应用到宝钢冷轧薄板厂1220五机架冷连轧机的生产实践,有效的保证了工作辊磨损的预报精度,为辊型设计、板形控制奠定了坚实的理论基础,提高了产品的板形质量,为企业创造了较大的经济效益,具有进一步推广应用的价值。     

Effects of Electric Potentials on Tribological Properties of SiC/HT200 Pairs in NaOH Solutions

On a self-developed circular-translation polishing machine, the influence of different electric potentials on the friction coefficient and wear properties of SiC/HT200 friction pair, which contacted as one electrode, were studied in NaOH solutions. The results show that the friction coefficient of SiC/HT200 pair is 0.25 under no externally applied potential; but it decreases to 0.23 while applying +3 V polarization potential on the pair; in contrast, it increases to 0.30 when applying -3 V polarization potential on the pair. And the polished SiC surface under +3 V potential is much smoother, while there are clear ploughing marks and adhesive region on the polished SiC surface under zero and -3 V potential, respectively. The mixed tribo-electrochemical friction model has been proposed and the mechanisms of the electric effects on the tribological properties of SiC/HT200 friction pair in NaOH electrolyte are addressed. Results and discussion show that the anodic passivation technique may be used for hastening the running-in process of SiC/Fe friction pairs, as well as for polishing SiC to increase its materials removal efficiency while maintaining good surface quality.     

渐开线花键副微动磨损疲劳寿命预估

为准确预估渐开线花键副微动磨损疲劳寿命,在假设微动磨损与微动疲劳共同作用的情况下,对某型机主减速器花键副的微动损伤机理进行研究.分析国内外现有的微动疲劳预测方法,在传统SWT法预估疲劳寿命的基础上,忽略疲劳发生的位置和方向,给出花键副的损伤累积计算方法,在给定工况下预估航空花键副微动磨损疲劳寿命.结果表明:花键副微动作用过程中,微动磨损与微动疲劳互相竞争互相抑制,最终导致花键副在两种微动模式共同作用下发生疲劳失效;花键副的疲劳寿命随着SWT值的增大而减小.提出的损伤累积模型能较准确地反映微动磨损对微动疲劳的作用,为花键副的设计和维修提供了数值参考,也为进一步研究考虑齿侧间隙时的花键副微动磨损疲劳寿命预估提供了依据.     

制动摩擦材料研究的现状与发展

对轮式车辆摩擦制动器摩擦材料的研究进行了综述,探讨了石棉摩擦材料、半金属摩擦材料、非石绵有机磨擦材料和金属摩擦材料的性能及其摩擦磨损机理,提出了环保与节能交进制动摩擦材料研究的发展趋势。     

Tribological properties of electroless Ni-P-SiC composite coatings in rolling/sliding contact under boundary lubrication

Ni-P-SiC composite coatings were prepared under a given bath composition and operation parameters of electroless plating. The tribological properties of the Ni-P-SiC composite coatings after annealing at 400℃ for 1 h were tested in rolling/sliding contact under boundary lubrication condition using a two-roller tribometer. The measurement contained friction coefficient, contact surface temperature, contact electrical resistance, and wear rate of the Ni-P-SiC composite coatings under various slide to roll ratios, loads, and rolling speeds. For the simultaneous examination of the effect of the chosen parameters on the tribological properties of the Ni-P-SiC composite coatings, an orthogonal regression experimental design method was used.