基于PVD-TiN和TiSiN涂层的Al_2O_3/TiCN陶瓷刀具及其切削性能研究  

TiN and TiSiN Coated Al_2O_3/Ti CN Ceramic Cutting Tools and Their Cutting Performance

作　　者：曾俊杰[1] 刘伟[1] 龙莹[1] 古尚贤 李安琼 伍尚华[1] 

机构地区：[1]广东工业大学机电工程学院,广州510006

出　　处：《无机材料学报》2015年第10期1089-1093,共5页Journal of Inorganic Materials

基　　金：广东省引进领军人才专项资金(400120001);广东省高等学校科技创新重点项目(501120021)~~

摘　　要：采用物理气相沉积(Physical vapor deposition,PVD)工艺在Al2O3/Ti CN陶瓷刀具表面分别沉积了Ti N和Ti Si N涂层。通过扫描电子显微镜(SEM)观察涂层微观结构,采用显微硬度计和划痕仪分别表征涂层硬度和测量涂层与基体的结合强度。通过对涂层刀具进行连续干切削灰铸铁实验,研究Ti N和Ti Si N涂层对刀具磨损特征的影响并探讨其磨损机理,同时研究了涂层对工件加工表面质量的影响。结果表明:PVD涂层可显著提高Al2O3/Ti CN陶瓷的刀具硬度。Ti N涂层和Ti Si N涂层可分别提高刀具表面硬度25%和65%,从而增加刀具耐磨性。两种涂层刀具在连续切削灰铸铁实验中主要的失效机理均是挤压变形下的磨粒磨损,其中Ti N涂层刀具还伴随有粘结磨损;刀具上的PVD-Ti N和Ti Si N涂层可以有效保护Al2O3/Ti CN陶瓷刀具基体,防止崩刃,进而改善工件表面加工质量。The Ti N, Ti Si N coatings were deposited on Al2O3/Ti CN matrix by physical vapor deposition（PVD） technique. The microstructure, hardness and adhesion evaluation of the coatings were studied by scanning electron microcope（SEM）, micro-hardness tester and scratch test, respectively. Turning tests were carried out on both uncoated and coated tool in gray cast iron turning under dry environment. Cutting performance, wear mechanism and machining quality of the uncoated and coated matrix were investigated. The results show that PVD-Ti N and Ti Si N coating can distinctly improve the hardness of cutting tool by 25% and 65%, respectively, leading to the tool life being enhanced. The dominant wear mechanism of Ti N and Ti Si N coated tools after turning tests were abrasion, meanwhile Ti N coated tool was accompanied by adhesive wear. Compared with the un-coated tools, the PVD coated tools showed no chipping and significant improvement in surface roughness of the finish parts.

关 键 词：连续切削 切削性能 涂层刀具 

分 类 号：TQ174[化学工程—陶瓷工业]