TY - JOUR

T1 - High temperature fracture toughness of single-layer CrAlN and CrAlSiN hard coatings

AU - Drnovsek, Aljaz

AU - Vo, Hi

AU - Rebelo de Figueiredo, Marisa

AU - Kolozsvári, Szilárd

AU - Hosemann, Peter

AU - Franz, Robert

N1 - Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/3/15

Y1 - 2021/3/15

N2 - 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 °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 °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.

AB - 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 °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 °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.

UR - http://www.scopus.com/inward/record.url?scp=85100028570&partnerID=8YFLogxK

U2 - 10.1016/j.surfcoat.2021.126909

DO - 10.1016/j.surfcoat.2021.126909

M3 - Article

VL - 409.2021

JO - Surface & coatings technology

JF - Surface & coatings technology

SN - 0257-8972

IS - 15 March

M1 - 126909

ER -