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 language | English (US) |
|---|---|
| Article number | 124956 |
| Journal | Surface and Coatings Technology |
| Volume | 378 |
| DOIs | |
| State | Published - Nov 25 2019 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
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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 journal › Article
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.
UR - http://www.scopus.com/inward/record.url?scp=85072023117&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072023117&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2019.124956
DO - 10.1016/j.surfcoat.2019.124956
M3 - Article
AN - SCOPUS:85072023117
VL - 378
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
SN - 0257-8972
M1 - 124956
ER -