Preparation and Cutting Performance of Diamond Coated Hard Alloy Cutting Tools for 7075 Aviation Al-alloy

doi:10.11901/1005.3093.2017.774

Chinese Journal of Materials Research

2019, Vol. 33

Issue (1): 15-26 DOI: 10.11901/1005.3093.2017.774

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Preparation and Cutting Performance of Diamond Coated Hard Alloy Cutting Tools for 7075 Aviation Al-alloy

Yibao WANG^1,²,Nan HUANG¹(

),Lusheng LIU¹,Ziyao YUAN¹,Peng LI¹,Wenxue ZHANG²(

),Xin JIANG¹(

)

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China

Cite this article:

Yibao WANG,Nan HUANG,Lusheng LIU,Ziyao YUAN,Peng LI,Wenxue ZHANG,Xin JIANG. Preparation and Cutting Performance of Diamond Coated Hard Alloy Cutting Tools for 7075 Aviation Al-alloy. Chinese Journal of Materials Research, 2019, 33(1): 15-26.

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Abstract

Diamond coatings were deposited on hard alloy cutting tool of WC-Co8% via hot filament chemical vapor deposition (HFCVD) technology. Two type of coatings, namely, monolayered coating consisted of microcrystalline with grain size of 1.2 μm and multi-layered coating consisted of nanocrystalline with grain size of 200 nm, were prepared by adjusting the methane concentration in the reaction chamber. Then the cutting performance of WC-Co8% cutting tools coated with the two coatings was comparatively assessed via machining 7075 aviation Al-alloy under dry cutting conditions without lubrication. The results show that after cutting for 2 h, coating partially spalled off and the tool edge became blunted for the tool with monolayer diamond coating, in the contrary, the tool edge remains intact and the coating does not fall off for the tool with multilayed diamond coating. Furthermore, Rockwell indentation test of flat samples of hard alloy with coatings revealed that the area of delamination induced by indentation for the multilayered coating is 1/5 to 1/10 of that for the monolayered one. Accordingly, the cracking resistance of the multilayered diamond coating should be better. It follows that the multilayered structure can be adopted to enhance the adhesion of diamond coatings to the substrate, thereby effectively increase the service performance of diamond coating tools.

Key words: surface and interface in the materials hot filament chemical vapor deposition diamond coating tool multilayer diamond cutting performance

Received: 29 December 2017

ZTFLH:

O484

Fund: National Natural Science Foundation of China(51202257);Shenyang Double-Huandred Project(Z17-7-027);Shenyang Double-Huandred Project(Z18-0-025)

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	Yibao WANG
	Nan HUANG
	Lusheng LIU
	Ziyao YUAN
	Peng LI
	Wenxue ZHANG
	Xin JIANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.774 OR https://www.cjmr.org/EN/Y2019/V33/I1/15

Table 1 Detials of diamond films deposited on WC-Co8% piece with different CH₄ Concentration

Fig.1 Two different diamond films

Table 2 Detials of diamond films deposited with different CH₄ on tools

Fig.2 SEM images of diamond films deposited at different mechane concentration (a) 1%; (b) 1.5%; (c) 2%; (d) 3%

Fig.3 Cross-sectional SEM images of diamond films deposited at different mechane concentration (a) 1%; (b) 1.5%; (c) 2%; (d) 3%

Fig.4 Growth rate of diamond films deposited at different mechane concentration

Fig.5 Fitting curve of Raman spectrum detected from the specimen (a) 1%; (b) 1.5%; (c) 2%; (d) 3%

Fig.6 I_Diamond/I_G of diamond films deposited with different mechane concentration

Fig.7 XRD partterns of diamond films deposited at different methane concentration (a) 1%; (b) 1.5%; (c) 2%; (d) 3%

Fig.8 FWHM of diamond films deposited at different methane concentration

Fig.9 Images of diamond tool (a) top; (b) edge; (c) object of tool; (d) groove

Fig.10 Edge and cross-sectional SEM images of monolayer and multilayer diamond tools (a) edge of monolayer diamond tool; (b) edge of multilayer diamond tool; (c) cross-section of monolayer diamond tool; (d) cross-section of multilayer diamond tool

Fig.11 Raman shift of monolayer and multilayer diamond tools

Fig.12 Image of the Rockwell C indentation with 60Kgf and 100Kgf on the different film (a) 60 Kgf on monolayer diamond film; (b) 60 Kgf on multilayer diamond film; (c) 100 Kgf on monolayer diamond film; (d) 100 Kgf on multilayer diamond film

Fig.13 Images of edge of tools after cut test 1 h,1.5 h,2 h No film tool (a) 1 h; (b) 1.5 h; (c) 2 h; Monolayer diamond film tool (d) 1 h; (e) 1.5 h; (f) 2 h; Multilayer diamond film tool (g) 1 h; (h) 1.5 h; (i) 2 h

Fig.14 SEM Images of edge of tools after cut test 1 h, 1.5 h, 2 h, No film tool (a) 1 h; (b) 1.5 h; (c) 2 h; Monolayer diamond film tool (d) 1 h; (e) 1.5 h; (f) 2 h; Multilayer diamond film tool (g) 1 h; (h) 1.5 h; (i) 2 h

Fig.15 SEM images and EDS of breakage of monolayer diamond film tool (a) edge; (b) breakage; (c) EDS of interface

Fig.16 Faliure analysis of different films (a) monolayer diamond film; (b) multilayer diamond film

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