磨损

Approaches of increasing wearability of materials under sand slurry wear condition were to reduce the micro-cutting of matrix structure and cut down the desquamating of carbide particles.

提出了在泥沙磨损条件下提高材料耐磨性的途径：一方面是如何减少基体组织的显微切削磨损；另一方面是如何使碳化物不易脱落，更好地起到保护基体的作用。

Copper nanoparticles were modified by surface modifier, methyl - methylacrylate, and minified by use of fluid-flow comminuted method, the disper sity and dispersion stability of the modified copper nanoparticles as additive i n CD 15W/40 engine oil were evaluated by high velocity centrifuger; its morpholo gy and particle size were tested by TEM and XRD analysis; and its tribological p roperty in CD 15W/40 engine oil was investigated by ball on pan tribo-tester.

采用化学改性法与液流粉碎机械法对纳米铜微粒进行了表面改性和分散研究，采用高速离心机考察了表面改性后纳米铜微粒作为添加剂在CD15W/40柴油机油中的分散性及分散稳定性，采用TEM、XRD测试了表面改性纳米铜微粒的形貌及粒径大小，采用球盘磨损试验机考察了表面改性纳米铜微粒作为CD15W/40全配方调配油添加剂的摩擦学性能，用SEM、EDS观察了磨损表面的形貌、线扫描、面分布及元素含量，分析了纳米铜微粒在摩擦过程中的减摩润滑机理。结果表明：甲基丙烯酸甲酯化学改性结合液流粉碎方法处理后纳米铜微粒的粒径进一步均匀、细化，平均粒径为24nm，并在CD15W/40油中分散性好，悬浮稳定时间长。

Sulphurized-nitrided compound layer is prepared on the surface of drilling pipe joint material 35CrMo steel by the application of ion nitriding and ion sulfurizing technology.

应用离子渗氮与离子渗硫技术，在钻杆接头材料35CrMo钢表面制备了硫氮复合处理层。采用M-200环块磨损试验机，对比研究了原始渗氮表面与硫氮复合表面在干摩擦条件下的抗磨损性能。

Finally, the numerical simulation approach of tool wear was studid on the basis of numerical simulation of SPIF, and the process parameters on the impact of the tool wear were researched.

最后，在渐进成形数值分析的基础上，探讨了对工具头磨损进行数值模拟分析的方法和流程，并通过仿真，研究了工艺参数对工具磨损的影响关系。

Below 300 300 to 1200 Ordinary Portland or Portland blastfurnace Ordinary Portland or Portland blastfurnace Sulphate resisting Supersulphated Sulphate resisting or Supersulphated High alumina Sulphate resisting or Supersulphated High alumina Sulphate resisting or Supersulphated with adequate protective coating High alumina Minimum cement content (kg m-3) Type of cement Maximum size of aggregate 37.5 240 290 240 270 290 290 330 330 330 330 19.0 280 330 280 310 330 330 370 340 370 370 9.5 330 380 330 360 380 380 420 410 420 420 0.55 0.50 0.55 0.50 0.50 0.45 0.45 0.40 0.45 0.35 Maximum water-cement ratio 0.5 to 1.0 1.0 to 2.0 1200 to 2500 2500 to 5000 Over 2.0 Over 5000 Wear

这些气 穴通常由具有格外高能量的水蒸气所填充，与混凝土表面的反复接触导致形成凹陷和孔洞，即气蚀。既然高质混凝土也不能抵抗这种劣化，因此最好的补救是通过制造平滑水流来消除气蚀。在所有必须的地方，关键的面上衬以高抗气蚀性的材料。通常，混凝土抗腐蚀和磨损的能力随强度增加而提高。采用硬韧的集料可改善混凝土的抗磨损性。

Pump wear and tear maintenance: Pump body is absorbing the major section of wear surface arc-shaped face.

泵体的磨损维修：泵体内表面磨损主要是吸油区段圆弧形工作面。

With increasing the speed and axle load of railway,the wear of wheel/rail is becoming more and more serious.

随着列车运行速度和轴重的提高，轮轨系统的磨损越来越严重，其中曲线半径、轴重和运行速度是影响轮轨磨损的重要因素。

The Circulation-hydrogenation Compressor Model BLC-305/A is an important equipment with Hydrogenation devices, which is imported by Lanzhou Petrochemical Company Refinery. Due to high-speed rolling periodically, the spare parts of this compressor, to a varying extent, show a lot of signs of wear and tear. Especially, the axle sleeve of the rotor axle of the compressor is so worn to the greatest degree that its work efficiency decreases by a big margin. Machinery Factory of Lanzhou Petroleum Processing and Chemical Complex has undertaken this task to repair the rotor.

BCL—305/A型循环加氢压缩机是兰州石化炼油厂从国外引进的一台用于加氢装置的重要设备，该设备经长周期的高速运转，零部件均有不同程度的磨损，特别是压缩机转子轴上的轴套磨损程度最大，使整机效率大幅度下降，兰炼机械厂承担了这项转子修复任务。

Bankston et al. reported wear of 0.08 mm a year with a cemented all-polyethylene implant, a rate that increased to 0.10 mm a year with the addition of metal backing.

Bankston等报告骨水泥固定全聚乙烯假体的年磨损为0.08mm，而加金属外壳后平均磨损增至0.10mm。

For preventing the stator from wearing and tearing , close ring and balance cover etc are made up to the stator , and the available spare parts are changed after the wear .

为防止定子磨损，定子上装有密封环、平衡套等，磨损后可用备件更换。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐