氮化处理金属陶瓷刀具的磨损形态和机理  

Wear morphological and mechanism of cermet tools with surface heat-treatment in nitrogen

作　　者：石增敏[1] 郑勇[2] 游敏[1] 丰平[1] 刘文俊[1] 

机构地区：[1]三峡大学机械与材料学院,湖北宜昌443002 [2]南京航空航天大学材料与科学技术学院,江苏南京210016

出　　处：《功能材料》2007年第A10期3941-3944,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目（50674057）;华中科技大学塑性成形模拟及模具技术国家重点实验室开放课题联合资助项目（05-13）

摘　　要：利用真空烧结工艺和表面氮化处理工艺，制备了纳米复合Ti（C，N）基金属陶瓷可转位刀片和功能梯度Ti（C，N）基金属陶瓷可转位刀片，详细研究了氮化处理对自制金属陶瓷刀具磨损形态和机理的影响,结果表明：自制刀片氮化处理前后的磨损形态有较大不同，显示了氮化处理后，刀片表面硬度的提高和表面层合金元素的变化，使得刀片的磨损机理和切削性能发生较大变化。氮化处理刀片切削正火态45^#钢、铸铁和奥氏体不锈钢时表现出较优的耐磨性。Nano-composite Ti（C, N）-based cermet indexable inserts and functionally gradient Ti（C, N）-based cermet indexable inserts were produced separately by vacuum sintering and surface heat-treatment with hot isostatic pressing （HIP） in nitrogen. The effect to wear morphological and mechanism of the newly fabricated cermet tools by the heat-treatment in nitrogen were investigated in detail. It was found that wear morphological of cermet tools changed after heat-treatment in nitrogen, which was due to the surface hardness being increased and the alternation of the elements in the surface layer. Comparing to the nano-composite Ti（C, N）-based cermet indexable inserts, the functionally gradient Ti（C, N）-based cermet indexable inserts exhibited a higher wear resistant for turning normalized medium carbon steel, quenched medium carbon steel and austenite stainless steel.

关 键 词：金属陶瓷 功能梯度 可转位刀片 磨损形态 

分 类 号：TG506[金属学及工艺—金属切削加工及机床]