表面合金涂层提高铸铁齿轮的接触疲劳强度研究  

A Research on the Contact Fatigue Strength of Cast Iron gear Drives with Ni-P-Co Alloy Coating

作　　者：李小周[1] 黄华梁[1] 

机构地区：[1]广西大学机械工程学院,广西南宁530004

出　　处：《机械传动》2002年第2期16-19,共4页Journal of Mechanical Transmission

摘　　要：接触疲劳破坏是铸铁齿轮的主要失效形式之一。本文研究在铸铁齿轮齿面涂镀Ni-P -Co合金层 ,以提高其接触疲劳强度 ,效果显著。同时 ,对合金涂层的表面形貌 ,次表面组织、纵剖面界面组织 ,表面粗糙度、涂层的硬度和疲劳点蚀坑形貌特征进行了分析。Cast iron is a material used for gear manufacture with good comprehensive performance and cheep price, which has extensive application in auto-mobile, tractor and agricultural machinery industry etc. Contact fatigue failure is the main failure type for cast iron gear. The autors researched the contact fatigue strength of Ni-P-Co alloy coating on the tooth surface of gears made of cast iron. With the help of Electron Microscope (EM) and Optical Microscope (OM), several studies on the alloying coating, such as surface shape, subsuper-ficical metellographic sturface, interface structure of longitudinal section, surface roughness, binding strength between alloy coating and matrix metal, element analysis of coating, micro-hardness and shape characteristic of fatigue pitting hole were carried out. The experimental results are analyzed and conclusion is as follows: contact fatigue life and strength of cast iron gears with Ni-P-Co alloy coating and air-cooling after heat-treatment with temperature of 450℃ are increased remarkably.

关 键 词：Ni-P-Co合金涂层 接触疲劳强度 抗点蚀能力 铸铁齿轮 

分 类 号：TG174.4[金属学及工艺—金属表面处理]