RESIDUAL STRESS AND FRACTURE TOUGHNESS OF PIRAC TITANIUM NITRIDE COATINGS

Siyuan Wu, Guoyun Zhang, Shoujun Wu and Yu Su
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Siyuan Wu: College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling Shaanxi, 712100, P. R. China
Guoyun Zhang: #x2020;State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling Shaanxi, 712100, P. R. China
Shoujun Wu: College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling Shaanxi, 712100, P. R. China
Yu Su: College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling Shaanxi, 712100, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 04, 1-8

Abstract: In this work, residual stress and fracture toughness of titanium nitride coatings prepared by powder immersion reaction assisted coating (PIRAC) at 700∘C with different processing times are studied. Results show that the residual stress in the coatings is compressive stress and increases with processing times increasing. Indentation fracture toughness of the PIRAC coatings increased with processing times (coatings’ thickness) increasing. The fracture toughness of the coatings prepared at 700∘C with a processing time of 144h and 192h is 6.88±0.20MPa⋅m1∕2 and 9.15±0.15MPa⋅ m1∕2, respectively. Bending induced crack propagation in the coating shows multi-deflection mode which is beneficial to energy absorption and thus improved fracture toughness.

Keywords: Titanium nitride coating; PIRAC method; residual stress; fracture toughness (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500561

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