CF/CVD/树脂炭复合材料的摩擦性能

采用针刺炭纤维整体毡作为骨架，经CVD致密，树脂浸渍固化增密及炭化，石墨化后制得C/C复合材料，研究了CVD炭和树脂炭含量对摩擦性能的影响。实验结果表明：CVD炭具有典型显微组织是材料具有良好摩擦性能的保证；C/C复合材料中加入适量的树脂炭不会影响材料的摩擦性能；摩擦系数大小不一定和摩损率成对应关系。     

Tribological behaviour of C-alloyed transition metal dichalcogenides (TMD) coatings in different environments

W-S-C films were deposited by non-reactive sputtering from a carbon target incrusted with WS₂ pellets in the eroded zone. This process allows depositing coatings with a wide range of compositions, with a precise control of their carbon content. Before the deposition, a Ti interlayer was interposed between the film and the substrate to improve the final adhesion. The carbon content in W-S-C system was varied from 29 at.% to 70 at.%, which led to an hardness enhancement from 4 GPa up to 10 GPa where the maximum hardness was reached in films with a carbon content between 40 at.% and 50 at.%. The tribological behaviour of the coatings was evaluated by pin-on-disk testing, in environments with different humidity levels. Generally, the tribological performance of W-S-C coatings in environments with moderate to high humidity is better for coatings with high carbon content. Friction coefficients, as 0.05 or lower could be reached at low humidity ranges (<7%) to all compositions. However, for higher humidity values, friction coefficient increased up to 0.30 in the W-S-C film with low carbon content whereas it was kept approximately constant for the others compositions.     

Oriented overgrowth of vapour deposited tin on highly oriented PTFE substrates

The vapour deposition of tin on highly uniaxially oriented PTFE causes an oriented overgrowth of tin islands. The origin of this orientation is not clear. Classic epitaxy as well as graphoepitaxy seems to be an explanation for the occurring orientation. The appearance of this orientation was observed in a temperature range from −80 °C to 90 °C. An orientation by crystallization from the melt could not be achieved so far. In this short communication, a metal/polymer system is introduced which offers new possibilities to investigate the origin of oriented overgrowth. Received: 19 September 1997/Revised version: 30 October 1997/Accepted: 31 October 1997     

自升式钻井平台插桩深度计算及几个问题的探讨

在海上油气的勘探和开发中，自升式钻井平台发挥了很大的作用。自升式钻井平台就其基础类型不同分为桩基式和沉垫式2种。本文就桩基式钻井平台的桩靴在均一黏性土、砂土及粉土上的插桩深度计算方法及其强度参数的选取等问题进行探讨。     

新型摩擦阻尼器在重型机械振动控制中的应用

探讨了一种新型耗能摩擦阻尼器的耗能原理及其在重型机械振动控制中的应用.研究表明,该阻尼器除具有传统阻尼器的优点外,还克服了传统摩擦阻尼器只能提供恒定的摩擦力的缺点.同时,该阻尼器可以利用振源信号进行反馈控制,因此增大了耗能能力,提高了减振效果.有限元仿真分析证明,该新型摩擦阻尼器应用在重型机械上具有较好的减振效果.     

110keVN^注入α—Al2O3陶瓷材料的摩擦学研究

研究了Ｎ＾＋（１１０ｋｅＶ）注入α－Ａｌ２Ｏ前，后陶瓷材料表面摩擦，磨损行为，考察了样品划痕轨迹的ＳＥＭ形貌，讨论了离子注入陶瓷材料表面力学性能衣摩擦学性能的之间的相互关系。     

离子注入精密摩擦付的橡拟实验研究

精密摩擦付是每种具有转动或滑动动作的精密机械的关键零件。从使用的角度来看,它的质量直接决定着整机的技术指标。制造经久耐用的精密摩擦付对于提高整机性能有二重意义:其一,长寿命摩擦付自然延长整机的使用寿命,减少零件耗损与整机维修时间,有很大的经济意义;其二,对于特定的使用场合,机器一经启动,在相当长的时间内不可停机,长寿命精密摩擦付就更加显示出其重要性了。从制造的角度来看,精密摩擦付允许公差很小,只有     

机床爬行现象的机理分析

本文以摩擦原理对机床的爬行现象进行机理分析,并介绍一些消除爬行的有效方法。     

CCL中铜屑产生原因的分析和处理

通过分析CCL中铜屑产生的原因,阐明了CCL中铜屑的预防和发生铜屑的处理。     

模数法设计金属型铸造铝活塞保温冒口

根据保温冒口的散热特征,引用有效散热系数修正凝固模数,进一步修正金属型铸造的凝固比得出金属型保温胃口方程式.并设计了东风EQ140汽车活塞的保温冒口.浇注实验结果显示:铸造工艺出品率提高到84.9%,显著提高了冒口有效补缩效率.