基于PVD-TiN和TiSiN涂层的Al2O3/TiCN陶瓷刀具及其切削性能研究

doi:10.15541/jim20150106

无机材料学报 ›› 2015, Vol. 30 ›› Issue (10): 1089-1093.DOI: 10.15541/jim20150106 CSTR: 32189.14.10.15541/jim20150106

基于PVD-TiN和TiSiN涂层的Al₂O₃/TiCN陶瓷刀具及其切削性能研究

曾俊杰, 刘伟, 龙莹, 古尚贤, 李安琼, 伍尚华

(广东工业大学机电工程学院, 广州 510006)

收稿日期:2015-03-02 修回日期:2015-04-15 出版日期:2015-10-20 网络出版日期:2015-09-30
作者简介:曾俊杰(1990–), 男, 硕士研究生. E-mail: ghostjackzjj@163.com
基金资助:
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)

TiN and TiSiN Coated Al₂O₃/TiCN Ceramic Cutting Tools and Their Cutting Performance

ZENG Jun-Jie, LIU Wei, LONG Ying, GU Shang-Xian, LI An-Qiong, WU Shang-Hua

(School of Electromechanical Engineering, Guangdong University of Technology, Guanzhou 510006, China)

Received:2015-03-02 Revised:2015-04-15 Published:2015-10-20 Online:2015-09-30
About author:ZENG Jun-Jie. E-mail: ghostjackzjj@163.com

摘要/Abstract

摘要：

采用物理气相沉积(Physical vapor deposition, PVD)工艺在Al₂O₃/TiCN陶瓷刀具表面分别沉积了TiN和TiSiN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TiN和TiSiN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/TiCN陶瓷的刀具硬度。TiN涂层和TiSiN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TiN涂层刀具还伴随有粘结磨损; 刀具上的PVD-TiN和TiSiN涂层可以有效保护Al₂O₃/TiCN陶瓷刀具基体, 防止崩刃, 进而改善工件表面加工质量。

关键词: 连续切削, 切削性能, 涂层刀具

Abstract:

The TiN, TiSiN coatings were deposited on Al₂O₃/TiCN 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-TiN and TiSiN 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 TiN and TiSiN coated tools after turning tests were abrasion, meanwhile TiN 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.

Key words: continuous cutting, cutting performance, coated tools

中图分类号:

TQ174

曾俊杰, 刘伟, 龙莹, 古尚贤, 李安琼, 伍尚华. 基于PVD-TiN和TiSiN涂层的Al₂O₃/TiCN陶瓷刀具及其切削性能研究[J]. 无机材料学报, 2015, 30(10): 1089-1093.

ZENG Jun-Jie, LIU Wei, LONG Ying, GU Shang-Xian, LI An-Qiong, WU Shang-Hua. TiN and TiSiN Coated Al₂O₃/TiCN Ceramic Cutting Tools and Their Cutting Performance[J]. Journal of Inorganic Materials, 2015, 30(10): 1089-1093.

图/表 8

表1 灰铸铁HT250的化学成分及机械性能

Table 1 Chemical composition and mechanical properties of HT250 gray cast iron

Chemical composition
C	Si	Mn	S	P
3.16-3.30	1.79-1.93	0.89-1.04	0.094-0.125	0.12-0.17
Hardness		209 HB(RH=1)
Tensile strength		250 MPa

图1 TiN涂层的(a)截面形貌与(c)划痕测试结果和TiSiN涂层的(b)截面形貌与(d)划痕测试结果

Fig. 1 The morphology of the cross section and scratch test result of (a, c) TiN coating and (b, d) TiSiN coating

表2 Al2O3/TiCN复合陶瓷刀具与PVD涂层物理性能

Table 2 Physical properties of Al2O3/TiCN ceramic tool and PVD coating

Coatings	Hardness (HV_50g)	Costing thickness/μm	Critical load L_c/N
Un-coated	2050±17	-	-
TiN-coated	2487±24	2.2	43.7
TiSiN-coated	3289±27	1.9	44.1

图2 TiN、TiSiN涂层与无涂层Al2O3/TiCN复合陶瓷切削磨损曲线

Fig. 2 Flank wear VB of the uncoated, TiN coated and TiSiN coated tools

图3 无涂层刀具的SEM磨损形貌

Fig. 3 SEM images of uncoated tool wear

图4 TiN涂层刀具的SEM磨损形貌与EDS分析结果

Fig. 4 SEM image and EDS result of TiN coated tool wear

图5 TiSiN涂层刀具的SEM磨损形貌

Fig. 5 SEM image of TiSiN coated tool wear

图6 切削实验工件表面质量变化

Fig. 6 Variation rougness of workpiece surface

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基于PVD-TiN和TiSiN涂层的Al₂O₃/TiCN陶瓷刀具及其切削性能研究

TiN and TiSiN Coated Al₂O₃/TiCN Ceramic Cutting Tools and Their Cutting Performance

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