摘要
采用热压法CaF2作为添加剂,Al2O3/TiC(LT55)作为基体制备出了自润滑陶瓷刀具,并对其进行了干切削试验。在切削过程中,在刀具前刀面上能形成自润滑膜,从而使刀具具有减摩性能。用扫描电镜观察了前刀面和后刀面微观结构。LT55在切削加工45钢时,Al2O3/TiC/CaF2(ATF)自润滑陶瓷刀具前刀面的平均摩擦系数比未添加固体润滑剂的LT55陶瓷刀具显著降低,其主要原因是在ATF自润滑陶瓷刀具的前刀面上形成了一层固体润滑膜,这层润滑膜可起到减摩作用。自润滑刀具在切削过程中,自润滑膜经历生成、破损、脱落、再生成的循环过程,因此,ATF自润滑陶瓷刀具在其整个生命周期内都具有自润滑效果。自润滑刀具后刀面不存在固体润滑膜,具有较明显的磨料磨损特征。
An Al2O3/TiC （LT55） self-lubricating ceramic tool with the addition of CaF2 was produced by hot pressing. Dry cutting tests were carried out with respect to 45 steel and Al2O3/TiC/CaF2 （ATF） self-lubricating ceramic cutting tools. The friction of the ATF tool was reduced by forming a film on the tool rake face. The morphologies of the rake face and rear face of the tool cutting the steel in air were observed by a scanning electron microscope. It was found that the friction coefficient of ATF tool was lower than that of LT55 due to a lubricating film generated on the rake surface of ATF tool. The film follows the forming, destroying, falling off and reforming circle processes, therefore, ATF tool has self-lubricating function in its whole lifecycle. There was no a lubricating film on the rear face of the ATF tool, where existed a obvious wear feature.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2006年第10期1232-1237,共6页
Journal of The Chinese Ceramic Society
基金
青岛科技大学科研启动基金资助项目
关键词
陶瓷刀具
自润滑
干切削
摩擦磨损
self-lubricating
ceramic cutting tools
dry cutting
friction and wear
