Performances and failure mechanism of semi-metallic friction materials doping rare earths

In order to improve performance of semi-metallic friction material,the specimens doped with rare earth(cerous nitrate) were prepared.The effects of rare earth(cerous nitrate) and post heat treatment on properties of friction materials were discussed,and failure mechanism of friction materials was also analyzed.The result showed that the existing of cerous nitrate could stabilize friction coefficient,lower wear rate and increase impact strength,and when the content of the cerous nitrate was 3.0 wt.%,the semi-metallic friction material possessed optimal performances.The different post heat treatments had an influence on the friction coefficient,wear rate and linear thermal expansion coefficient of semi-metallic friction material.The worn surface and fractured surface were observed and analyzed by scanning electronic microscopy(SEM).It was identified that the semi-metallic friction materials doped with cerous nitrate acted abrasive wear and adhesive wear at the low temperature,and abrasive wear,adhesive wear and fatigue wear of materials appeared at the high temperature.The fracture of materials might be the result of matrix cracking interacting with interface separation.     

浅谈汽车检测诊断技术的应用及发展方向

本文主要从汽车检测诊断概述、方法及标准、应用及其发展方向进行阐述。     

纯麻织物的酶处理

纯麻织物具有优良的吸湿，透气，滑爽等特点，但其刺痒感和抗折皱性差，影响其服用性能，本文通过小样与大车实验，用酶洗剂１５３８与微硅乳柔软剂２７１结合对纯织物进行处理，获得很好的效果，从根本上改善了纯麻织物的服用性能，处理后样品手感柔软丰满，外观挺括飘逸，风格可与市场有售的进口纯麻面料相媲美。     

油垫法开采在芒硝矿中的应用及效果分析

油垫法是以一口井为一个开采单元,利用油、水互不相溶和石油密度小,且石油不溶解盐类矿物的特性,使其在水溶开采顶部形成一个很薄的油垫层,将水与矿体隔开,以控制上溶,迫使溶解作用往水平方向进行。文章介绍了油垫法开采在芒硝矿中的实际应用及效果分析。     

用酶洗剂1538改善纯麻织物服用性能的工艺探讨

纯麻织物具有优良的吸湿、透气、滑爽等特点,但其刺痒感和抗折皱性差,影响其服用性能。本文通过小样与大车实验,用酶洗剂 1538与微硅乳柔软剂271结合对纯麻织物进行处理,获得很好的效果,从根本上改善了纯麻织物的服用性能。处理后样品手感柔软、丰满,外观挺阔飘逸,风格可与市场有售的进口纯麻面料相媲美。     

浮心连接技术在往复式注水泵中的推广应用

介绍了往复式注水泵的结构原理及柱塞、中间杆对中不良导致的问题。浮心连接技术将原螺纹硬连接改为铰链连接,可以克服对中不良导致的问题。在江苏油田矿业开发总公司推广使用该技术,取得了良好的效果。