Comparative Study of Sliding, Scratching, and Impact-Loading Behavior of Hard CrB2 and Cr–B–N Films

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• 作者：Ph. V. Kiryukhantsev-Korneev ; J. F. Pierson ; M. Y. Bychkova…
• 刊名：Tribology Letters
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：63
• 期：3
• 全文大小：6,039 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Tribology, Corrosion and Coatings
  Surfaces and Interfaces and Thin Films
  Theoretical and Applied Mechanics
  Physical Chemistry
  Nanotechnology
  
• 出版者：Springer Netherlands
• ISSN：1573-2711
• 卷排序：63

文摘

CrB₂ and Cr–B–N films were deposited by magnetron sputtering of CrB₂ target in an argon atmosphere or in a gaseous mixture of argon and nitrogen. The films were characterized in terms of their adhesion strength, sliding, and impact wear resistance. Crack resistance of the films was evaluated by micro-indentations. The adhesion strength was studied by means of scratch testing. The wear tests were performed under different loads against chromium steel and WC–Co counterpart materials. In order to determine the film fatigue toughness, dynamic impact tests were carried out. The indentations, scars, wear tracks, and impact cavities on the film surface were examined using optical profilometry, as well as optical and scanning electron microscopy. Comparison of lifetimes of CrB₂ and Cr–B–N-coated cemented carbide mills in dry milling of D2 high-chromium steel was also performed. The obtained results show that the CrB₂ film has poor adhesion, low fracture toughness, and rapidly fails during sliding and dynamic impact tests. In contrast, the Cr–B–N films with nitrogen content between 7 and 11 at.% exhibited superior adhesion strength (critical load \(L_{{{\text{c}}_{2} }}\) = 70–90 N), good tribological properties (friction coefficient against WC–Co <0.4 and wear rate <2×10−6 mm3 N−1 m−1), and reduced impact wear. The lifetime of mills coated with Cr–B–N films was 1.3 and 2.0 times longer as compared to the tools coated with TiN and CrB₂ films and uncoated WC–Co tools, respectively.KeywordsCrB₂ and Cr–B–N filmsMagnetron sputteringFriction and wearCrack resistanceAdhesion strengthCyclic impact loadingCutting tools