Microstructure and mechanical properties of titanium nitride coatings for cemented carbide cutting tools by pulsed high energy density plasma

With a newly-developed technique, pulsed high energy density plasma (PHEDP), TiN, TiCN, and (Ti,Al)N coatings were deposited onto silicon nitride and cemented carbide cutting tools. The structures of these coatings were systematically investigated in this paper. The average surface roughness (Ra) of the coated tools were ranged in 20~150 nm. The smooth surface of coated tools means that the coatings are promising candidate for cutting tools of high precision and it is in favor of reducing the fiction coefficients and flank wear of tools. The coating thickness varied, in the range of 3~20 µm, with the deposition conditions of the shot number of pulsed plasma, and the voltages between the inner and outer electrodes of the coaxial gun. The coating has a densified structure compared to the substrate structure and almost no pores and cracks exist in the coating surface. The grain sizes of the coating were small (<100nm), much finer than those of the substrate (>2 µm). Except for TiN-Si3N4 system, no apparent columnar grain structure as presented predominantly in typical vapor deposited coatings was observed. In fact, an equiaxed structure was presented, due to the pulsed mode of plasma bombardment and solid solution strengthening of C or Al into TiN lattices, resulting in disruption, through renucleation, of epitaxy on individual columns. A continuous and densified interface was observed. All these characteristics in structures promised an excellent performance of the coated tools.

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Titanium carbonitride films on cemented carbide cutting tool prepared by pulsed high energy density plasma

Applied Surface Science ◽

10.1016/j.apsusc.2006.10.069 ◽

2007 ◽

Vol 253 (11) ◽

pp. 4923-4927 ◽

Cited By ~ 12

Author(s):

Wenran Feng ◽

Chizi Liu ◽

Guangliang Chen ◽

Guling Zhang ◽

Weichao Gu ◽

...

Keyword(s):

Energy Density ◽

Cutting Tool ◽

High Energy ◽

Cemented Carbide ◽

High Energy Density ◽

Titanium Carbonitride ◽

Carbide Cutting Tool ◽

Density Plasma

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Wear-Resistant Titanium Carbonitride Coatings onto WC-Co Cutting Tools by Pulsed High-Energy Density Plasma

Journal of the American Ceramic Society ◽

10.1111/j.1551-2916.2005.00365.x ◽

2005 ◽

Vol 88 (7) ◽

pp. 1786-1791 ◽

Cited By ~ 3

Author(s):

Zhijian Peng ◽

Hezhuo Miao ◽

Longhao Qi ◽

Size Yang ◽

Chizi Liu

Keyword(s):

Energy Density ◽

Cutting Tools ◽

High Energy ◽

High Energy Density ◽

Titanium Carbonitride ◽

Wear Resistant ◽

Density Plasma

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Structure of the Coatings onto Ceramic Cutting Tools Deposited by Pulsed High Energy Density Plasma

High-Performance Ceramics III - Key Engineering Materials ◽

10.4028/0-87849-959-8.1207 ◽

2007 ◽

pp. 1207-1210

Author(s):

He Zhuo Miao ◽

Zhi Jian Peng ◽

Long Hao Qi ◽

Feng Shi ◽

Wen Jie Si

Keyword(s):

Energy Density ◽

Cutting Tools ◽

High Energy ◽

High Energy Density ◽

Density Plasma

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Effect of Gradient Energy Density on the Microstructure and Mechanical Properties of Ti6Al4V Fabricated by Selective Electron Beam Additive Manufacture

Materials ◽

10.3390/ma13071509 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1509 ◽

Cited By ~ 2

Author(s):

Ta-I Hsu ◽

Yu-Ting Jhong ◽

Meng-Hsiu Tsai

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Electron Beam ◽

Additive Manufacturing ◽

Energy Density ◽

High Energy ◽

High Energy Density ◽

Positive Effects ◽

Microstructure And Mechanical Properties ◽

Gradient Energy

Selective Electron Beam Additive Manufacturing (SEBAM) is a promising powder bed fusion additive manufacturing technique for titanium alloys that select particular area melting in different energy density for producing complexly shaped biomedical devices. For most commercial Ti6Al4V porous medical devices, the gradient energy density is usually applied to manufacture in one component during the SEBAM process which selects different energy density built on particular zones. This paper presents gradient energy density base characterization study on an SEBAM built rectangular specimen with a size of 3 mm × 20 mm × 60 mm. The specimen was divided into three zones were built in gradient energy density from 16 to 26.5 J/mm3. The microstructure and mechanical properties were investigated by means of scanning electron microscopy, X-ray diffraction, transmission electron microscopy and mechanical test. The α′ martensitic and lack of fusion were observed in the low energy density (LED) built zone. However, no α′ phase and no irregular pores were observed both in overlap energy density (OED) and high energy density (HED) built zones located at the middle and bottom of the specimen respectively. This implies the top location and lower energy density have positive effects on the cooling rate but negative effects on densification. The subsequence mechanical properties result also supports this point. Moreover, the intermetallic Ti3Al found in the bottom may be due to the heat transfer from the following melting layer. Furthermore, the microstructure evolution in gradient energy built zones is discussed based on the findings of the microstructure and thermal history correlation analysis.

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