TY - JOUR
T1 - Fracture toughness and sliding properties of magnetron sputtered CrBC and CrBCN coatings
AU - Wang, Qianzhi
AU - Zhou, Fei
AU - Ma, Qiang
AU - Callisti, Mauro
AU - Polcar, Tomas
AU - Yan, Jiwang
N1 - Funding Information:
This work has been initiated by a Japan-China joint research project and partially supported by a research grant from Keio Leading-edge Laboratory of Science and Technology (KLL) in Keio University . In addition, this work has been supported by National Natural Science Foundation of China (Grant No. 51375231 , No. 51705245 ), Scientific Research Foundation for the Introduced Talent, Nanjing University of Aeronautics and Astronautics (Grant No. 1005-YAH16043 ), Natural Science Foundation of Jiangsu Province (Grant No. BK20170794 ) and The Tribology Science Fund of State Key Laboratory of Tribology (Grant No. SKLTKF17B05 ). We would like to acknowledge them for their financial support.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/6/15
Y1 - 2018/6/15
N2 - CrBC and CrBCN coatings with low and high B contents were deposited on 316L steel and Si wafers using an unbalanced magnetron sputtering system. Mechanical properties including hardness (H), elastic modulus (E) and fracture toughness (K Ic ) as well as residual stresses (σ) were quantified. A clear correlation between structural, mechanical and tribological properties of coatings was found. In particular, structural analyses indicated that N incorporation in CrBC coatings with high B content caused a significant structural evolution of the nanocomposite structure (crystalline grains embedded into an amorphous matrix) from nc-CrB 2 /(a-CrB x , a-BC x ) to nc-CrN/(a-BC x , a-BN). As a result, the hardness of CrBC coating with high B content decreased from 23.4 to 16.3 GPa but the fracture toughness was enhanced. Consequently, less cracks initiated on CrBCN coatings during tribological tests, which combined with the shielding effect of a-BN on wear debris, led to a low friction coefficient and wear rate.
AB - CrBC and CrBCN coatings with low and high B contents were deposited on 316L steel and Si wafers using an unbalanced magnetron sputtering system. Mechanical properties including hardness (H), elastic modulus (E) and fracture toughness (K Ic ) as well as residual stresses (σ) were quantified. A clear correlation between structural, mechanical and tribological properties of coatings was found. In particular, structural analyses indicated that N incorporation in CrBC coatings with high B content caused a significant structural evolution of the nanocomposite structure (crystalline grains embedded into an amorphous matrix) from nc-CrB 2 /(a-CrB x , a-BC x ) to nc-CrN/(a-BC x , a-BN). As a result, the hardness of CrBC coating with high B content decreased from 23.4 to 16.3 GPa but the fracture toughness was enhanced. Consequently, less cracks initiated on CrBCN coatings during tribological tests, which combined with the shielding effect of a-BN on wear debris, led to a low friction coefficient and wear rate.
KW - Ceramic bearings
KW - CrBCN
KW - Fracture toughness
KW - Sliding properties
KW - Wear mechanism
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U2 - 10.1016/j.apsusc.2018.02.276
DO - 10.1016/j.apsusc.2018.02.276
M3 - Article
AN - SCOPUS:85043387338
SN - 0169-4332
VL - 443
SP - 635
EP - 643
JO - Applied Surface Science
JF - Applied Surface Science
ER -