摘要
用UMT－2M摩擦试验机，测试了升温和降温（22～600℃）条件下，在Si3N4陶瓷球／GH126镍基高温合金盘间添加高铼酸铅粉末前后的摩擦系数．利用X射线衍射（XRD）和扫描电镜（SEM）对磨屑成分和磨痕形貌进行了分析，并用UMT附带装置测量了磨痕表面与金属球间的接触电阻．结果表明：升／降温条件下高铼酸铅都具有良好的减摩作用，摩擦系数较未加润滑剂的试验明显降低．这是由于在摩擦表面形成了完整的减摩膜．尤其是600℃时高铼酸铅熔化，形成易于流动的熔融态减摩膜，使摩擦系数达最低值，且良好的减磨作用可以一直持续到22℃．
Extensive research efforts have been devoted to develop a new substance which could achieve effective lubrication in a broad temperature range. Pb（ReO4）2, composed of the double oxides of PbO and Re2OT, exists in low shear strength. The anti-friction behavior of Pb（ReO4）2 was tested by Universal Micro-Tribotester （UMT-2M） with ball （Si3N4） on disc （superalloy） at elevated and declined temperature in the range of 22 ℃ to 600℃. Composition of debris and morphologies of worn tracks were determined by X-ray diffraction （XRD） and scanning electron microscope （SEM）, and contact resistance between the worn surface and steel ball was measured by UMT. The results show that Pb（ReO4）2 is a superior lubricant at elevated and declined temperatures, and the friction coefficient is much lower than that without lubricant. The superior lubricating properties should be attributed to the formation of an anti-frictional surface film. And higher temperature could result in the formation of a more complete and durable film. For Pb（ReO4）2 melts at 566℃, the fused product is much easier to flow and generate a film which could separate the tribo-pairs perfectly. Subsequently, the lowest friction coefficient is gained at 600℃, and good lubrication can be maintained till to 22℃.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第11期1204-1208,共5页
Journal of Inorganic Materials
关键词
高铼酸铅
减摩
升温
降温
lead perrhenate
anti-friction
elevated temperature
declined temperature
