High temperature fracture toughness of single-layer CrAlN and CrAlSiN hard coatings

SURFACE & COATINGS TECHNOLOGY

卷:409

Article

Drnovsek, Aljaz^1,2  Vo, Hi T.³  de Figueiredo, Marisa Rebelo¹  Kolozsvari, Szilard⁴  Hosemann, Peter^3,5  Franz, Robert¹ 

[1] Univ Leoben, Dept Mat Sci, Franz Josef Str 18, A-8700 Leoben, Austria

[2] Jozef Stefan Inst, Dept Thin Films & Surfaces, Jamova 39, Ljubljana 1000, Slovenia

[3] Univ Calif Berkeley, Dept Nucl Engn, 4105 Etcheverry Hall,MC 1730, Berkeley, CA 94720 USA

[4] Plansee Composite Mat GmbH, Siebenburgerstr 23, D-86983 Lechbruck, Germany

[5] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA

关键词: HT fracture toughness;    HT hardness;    Hard coating;    Finite element analysis;    Micro-cantilever;   

DOI  :  10.1016/j.surfcoat.2021.126909

来源: Elsevier

【 摘 要 】

Hardness and toughness are among of the most important physical properties of hard coatings and it is important to analyze them at temperatures present during coating applications. CrAlN and CrAlSiN are hard coating materials frequently used in high temperature applications. While both possess high oxidation resistance and thermal stability, they differ in their microstructure. In this work, the fracture toughness of magnetron-sputtered single-layer CrAlN and CrAlSiN hard coatings was determined up to 700 degrees C by in-situ scanning electron microscopy micro-cantilever deflection tests. The results show a decreasing trend of the fracture toughness with increasing temperature. While both coatings' fracture toughness trends are similar up to 400 degrees C, they diverge at higher temperatures. In general, the evolution of the fracture toughness with increasing temperature shows similarities to the observed changes in hardness in the same temperature range.

【 授权许可】

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