铬钛共渗及渗层耐磨性分析

通过表面铬钛渗层改性处理,可提高钢的表面硬度和耐磨性,从而提高工件的表面性能。对钢的铬钛共渗及其耐磨性进行分析研究,并与铬和钛的单渗层进行性能对比。结果表明,铬钛共渗层由混合铬碳化合物和TiC构成,这使得铬钛共渗层具有比铬和钛的单渗层更好的耐磨性。

金刚石锯片失效分析和强化方法

本文分析了金刚石锯片刀头失效的主要原因。采用扫描电子显微镜、能谱仪、硬度仪、光学显微镜等手段对金刚石锯片的刀头材料、微观组织及其与锯片耐磨性进行研究。研究结果表明,通过添加微量稀土合金元素后,细化了胎体合金晶粒组织,改善了胎体与金刚石的结合状况,可使胎体金属对金刚石的包镶致密、把持力明显增大;添加富铈稀土和铬合金元素的锯片胎体耐磨性都有提高,其中添加富铈稀土效果尤为明显。多种添加物的添加,其对耐磨性的增加作用也有叠加,其中添加稀土与铬合金元素的锯片磨损系数降低,提高了胎体合金的耐磨性,使其耐磨率降低了20%。

湘南香草铀矿床地球化学特征的探讨

文章结合工作实践,在系统的取样分析基础上,分析研究了湘南香草铀矿床的地质概况及矿化特征,探讨了铀与伴生元素地球化学的特征及各伴生元素矿化度的分布规律,并提出铀矿化富集具多期、多源、多成因的特点。以期能为铀矿找矿具有理论指导的意义。

Structure and property of Cu-based thermosensitive nanocomposite

The Cu-based thermosensitive nanocomposites are made by high energy ball milling. The microstructures and properties of Cu-based thermosensitive nanocomposites are studied by transmission electron microscopy(TEM) and themosensitivity test. The effects of milling time on the microstructures and the thermosensitivity of Cu-based nanocomposite material are researched. The results show that the Cu-based nanocomposite can be made by high energy ball milling. As the milling time increases, the copper particle size decreases in the nanocomposite, then the thermoexpansivity of nanocomposite increases. The nanocomposite is of best thermoexpansivity when the milling time is up to 100 h. At 35- 45 ℃, the nanocomposite shows good thermosensitivity.