Study on the crack resistance of CrBN composite coatings via nano-indentation and scratch tests

Qianzhi Wang, Fei Zhou, Mauro Callisti, Tomas Polcar, Jizhou Kong, Jiwang Yan

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Crack resistance of CrBN coatings in relation to B concentration was investigated via nano-indentation and scratch tests. A nano-composite structure consisting of CrN nano-grains embedded in amorphous BN (a-BN) matrix was observed by transmission electron microscope (TEM). XRD and XPS analyses revealed a decrease of crystallinity in coatings as B content increased from 16.4 to 27.2 at.%, which led to a hardness decrease from 28.9 GPa to 23.6 GPa. All CrBN coatings, regardless of composition, prevented radial cracks due to superior mechanical properties (H/E ≥ 0.077). However, owing to high compressive stress (3.27–4.74 GPa), circumferential cracks were found along indent edge, and the number of circumferential cracks was proportional to B concentration. Meanwhile, the critical load of initiating crack dropped from 17.9 to 13.4 N when B concentration raised from 12.8 to 22.2 at.%. The results of nano-indentation and scratch tests indicated that the crack resistance of CrBN coatings became poor when the B doping content increased. In here, the CrBN coating with 12.8 at.% B exhibited the best crack resistance.

Original languageEnglish
Pages (from-to)1103-1109
Number of pages7
JournalJournal of Alloys and Compounds
Volume708
DOIs
Publication statusPublished - 2017 Jun 25

Fingerprint

Composite coatings
Nanoindentation
Cracks
Coatings
Composite structures
Compressive stress
Electron microscopes
X ray photoelectron spectroscopy
Hardness
Doping (additives)
Mechanical properties
Chemical analysis

Keywords

  • Circumferential crack
  • CrBN
  • Nano-indentation
  • Residual stress
  • Scratch

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Study on the crack resistance of CrBN composite coatings via nano-indentation and scratch tests. / Wang, Qianzhi; Zhou, Fei; Callisti, Mauro; Polcar, Tomas; Kong, Jizhou; Yan, Jiwang.

In: Journal of Alloys and Compounds, Vol. 708, 25.06.2017, p. 1103-1109.

Research output: Contribution to journalArticle

Wang, Qianzhi ; Zhou, Fei ; Callisti, Mauro ; Polcar, Tomas ; Kong, Jizhou ; Yan, Jiwang. / Study on the crack resistance of CrBN composite coatings via nano-indentation and scratch tests. In: Journal of Alloys and Compounds. 2017 ; Vol. 708. pp. 1103-1109.
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