Microstructure, mechanical properties and cutting performances of TiSiCN super-hard nanocomposite coatings deposited using CVD method under the guidance of thermodynamic calculations

Lianchang Qiu, Yong Du, Liying Wu, Shaoqing Wang, Jifei Zhu, Wei Cheng, Zhuopeng Tan, Lei Yin, Zikui Liu, Albir Layyous

Research output: Contribution to journalArticle

Abstract

A general strategy for the development of TiSiCN super-hard nanocomposite coatings was proposed in the present work. Subsequently, TiSiCN coatings with promising industrial applications for cutting tools were prepared from gaseous mixtures of TiCl4, SiCl4, CH3CN, NH3/N2 and H2 by a low pressure chemical vapor deposition (CVD) process under the guidance of established phase diagrams. The chemical compositions, microstructure, mechanical properties and cutting performances of TiSiCN coatings were investigated. No Si was doped into MT (moderate temperature)-Ti(C,N) with N2 addition while higher Si contents (2.87–6.43 at.%) were obtained by using NH3. The measured compositions and phase assemblages of TiSiCN coatings were reasonably described by thermodynamic calculations. TiSiCN coatings showed nanocomposite structures consisting of nanocrystalline TiCxNy and amorphous SiCxNy. A maximum hardness (44.9 ± 0.9 GPa), ratios of H/E and H3/E⁎2 (H-hardness, E*-effective elastic modulus) were obtained for TiSiCN coating with a Si content of 2.87 at.% and a grain size of 37.7 nm, indicating enhanced mechanical properties to those of the previous works. TiSiCN displayed a superior cutting performance compared to MT-Ti(C,N) during continuous wet turning of nodular cast iron (DIN GGG40). It also exhibits a better wear resistance than state-of-the-art thicker MT-Ti(C,N) + Al2O3 multilayer coating during dry milling of the same material. TiSiCN coatings with better performances could be designed with the aid of the CVD phase diagrams in this work.

Original languageEnglish (US)
Article number124956
JournalSurface and Coatings Technology
Volume378
DOIs
StatePublished - Nov 25 2019

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Chemical vapor deposition
Nanocomposites
nanocomposites
vapor deposition
Thermodynamics
mechanical properties
coatings
Coatings
Mechanical properties
thermodynamics
microstructure
Microstructure
Phase diagrams
hardness
Hardness
phase diagrams
Low pressure chemical vapor deposition
Nodular iron
Cutting tools
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Qiu, Lianchang ; Du, Yong ; Wu, Liying ; Wang, Shaoqing ; Zhu, Jifei ; Cheng, Wei ; Tan, Zhuopeng ; Yin, Lei ; Liu, Zikui ; Layyous, Albir. / Microstructure, mechanical properties and cutting performances of TiSiCN super-hard nanocomposite coatings deposited using CVD method under the guidance of thermodynamic calculations. In: Surface and Coatings Technology. 2019 ; Vol. 378.
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title = "Microstructure, mechanical properties and cutting performances of TiSiCN super-hard nanocomposite coatings deposited using CVD method under the guidance of thermodynamic calculations",
abstract = "A general strategy for the development of TiSiCN super-hard nanocomposite coatings was proposed in the present work. Subsequently, TiSiCN coatings with promising industrial applications for cutting tools were prepared from gaseous mixtures of TiCl4, SiCl4, CH3CN, NH3/N2 and H2 by a low pressure chemical vapor deposition (CVD) process under the guidance of established phase diagrams. The chemical compositions, microstructure, mechanical properties and cutting performances of TiSiCN coatings were investigated. No Si was doped into MT (moderate temperature)-Ti(C,N) with N2 addition while higher Si contents (2.87–6.43 at.{\%}) were obtained by using NH3. The measured compositions and phase assemblages of TiSiCN coatings were reasonably described by thermodynamic calculations. TiSiCN coatings showed nanocomposite structures consisting of nanocrystalline TiCxNy and amorphous SiCxNy. A maximum hardness (44.9 ± 0.9 GPa), ratios of H/E⁎ and H3/E⁎2 (H-hardness, E*-effective elastic modulus) were obtained for TiSiCN coating with a Si content of 2.87 at.{\%} and a grain size of 37.7 nm, indicating enhanced mechanical properties to those of the previous works. TiSiCN displayed a superior cutting performance compared to MT-Ti(C,N) during continuous wet turning of nodular cast iron (DIN GGG40). It also exhibits a better wear resistance than state-of-the-art thicker MT-Ti(C,N) + Al2O3 multilayer coating during dry milling of the same material. TiSiCN coatings with better performances could be designed with the aid of the CVD phase diagrams in this work.",
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Microstructure, mechanical properties and cutting performances of TiSiCN super-hard nanocomposite coatings deposited using CVD method under the guidance of thermodynamic calculations. / Qiu, Lianchang; Du, Yong; Wu, Liying; Wang, Shaoqing; Zhu, Jifei; Cheng, Wei; Tan, Zhuopeng; Yin, Lei; Liu, Zikui; Layyous, Albir.

In: Surface and Coatings Technology, Vol. 378, 124956, 25.11.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructure, mechanical properties and cutting performances of TiSiCN super-hard nanocomposite coatings deposited using CVD method under the guidance of thermodynamic calculations

AU - Qiu, Lianchang

AU - Du, Yong

AU - Wu, Liying

AU - Wang, Shaoqing

AU - Zhu, Jifei

AU - Cheng, Wei

AU - Tan, Zhuopeng

AU - Yin, Lei

AU - Liu, Zikui

AU - Layyous, Albir

PY - 2019/11/25

Y1 - 2019/11/25

N2 - A general strategy for the development of TiSiCN super-hard nanocomposite coatings was proposed in the present work. Subsequently, TiSiCN coatings with promising industrial applications for cutting tools were prepared from gaseous mixtures of TiCl4, SiCl4, CH3CN, NH3/N2 and H2 by a low pressure chemical vapor deposition (CVD) process under the guidance of established phase diagrams. The chemical compositions, microstructure, mechanical properties and cutting performances of TiSiCN coatings were investigated. No Si was doped into MT (moderate temperature)-Ti(C,N) with N2 addition while higher Si contents (2.87–6.43 at.%) were obtained by using NH3. The measured compositions and phase assemblages of TiSiCN coatings were reasonably described by thermodynamic calculations. TiSiCN coatings showed nanocomposite structures consisting of nanocrystalline TiCxNy and amorphous SiCxNy. A maximum hardness (44.9 ± 0.9 GPa), ratios of H/E⁎ and H3/E⁎2 (H-hardness, E*-effective elastic modulus) were obtained for TiSiCN coating with a Si content of 2.87 at.% and a grain size of 37.7 nm, indicating enhanced mechanical properties to those of the previous works. TiSiCN displayed a superior cutting performance compared to MT-Ti(C,N) during continuous wet turning of nodular cast iron (DIN GGG40). It also exhibits a better wear resistance than state-of-the-art thicker MT-Ti(C,N) + Al2O3 multilayer coating during dry milling of the same material. TiSiCN coatings with better performances could be designed with the aid of the CVD phase diagrams in this work.

AB - A general strategy for the development of TiSiCN super-hard nanocomposite coatings was proposed in the present work. Subsequently, TiSiCN coatings with promising industrial applications for cutting tools were prepared from gaseous mixtures of TiCl4, SiCl4, CH3CN, NH3/N2 and H2 by a low pressure chemical vapor deposition (CVD) process under the guidance of established phase diagrams. The chemical compositions, microstructure, mechanical properties and cutting performances of TiSiCN coatings were investigated. No Si was doped into MT (moderate temperature)-Ti(C,N) with N2 addition while higher Si contents (2.87–6.43 at.%) were obtained by using NH3. The measured compositions and phase assemblages of TiSiCN coatings were reasonably described by thermodynamic calculations. TiSiCN coatings showed nanocomposite structures consisting of nanocrystalline TiCxNy and amorphous SiCxNy. A maximum hardness (44.9 ± 0.9 GPa), ratios of H/E⁎ and H3/E⁎2 (H-hardness, E*-effective elastic modulus) were obtained for TiSiCN coating with a Si content of 2.87 at.% and a grain size of 37.7 nm, indicating enhanced mechanical properties to those of the previous works. TiSiCN displayed a superior cutting performance compared to MT-Ti(C,N) during continuous wet turning of nodular cast iron (DIN GGG40). It also exhibits a better wear resistance than state-of-the-art thicker MT-Ti(C,N) + Al2O3 multilayer coating during dry milling of the same material. TiSiCN coatings with better performances could be designed with the aid of the CVD phase diagrams in this work.

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