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

doi:10.15541/jim20150106

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 8

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

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

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

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

Fig. 3 SEM images of uncoated tool wear

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

Fig. 5 SEM image of TiSiN coated tool wear

Fig. 6 Variation rougness of workpiece surface

References 14

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

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