Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 1

Influence of atmosphere composition on the structure and properties of aluminum oxynitride coatings deposited by PLD method

10.15199/28.2016.1.4

nr katalogowy: 96775
10.15199/28.2016.1.4

This work presents studies on the influence of oxygen content in reaction atmosphere during pulsed laser deposition on the structure and properties of aluminium oxynitride films. The coatings were grown on monocrystalline Si substrates. Aluminium nitride bulk disk was used as a target. The film deposition took place at room temperature and pressure of 0.5 Pa with varying content of oxygen and nitrogen. Thickness and roughness of the coatings were measured by profilometer. The X-ray diffractometer (XRD) was used for phase analysis of the coatings. Chemical composition was evaluated using X-ray microanalysis (EDS) by means of scanning electron microscopy (SEM). The surface topography was examined using an atomic force microscopy (AFM). Hardness of the coatings was measured by means of nanoindentation. Adhesion was evaluated in microscratch tests and the morphology of the residual scratch was characterized by AFM. Results showed that it was possible to obtain coatings composed of oxynitrides with different stoichiometry. Mechanical properties of the obtained coatings, however, were significantly different from those demonstrated by ALON ceramic. The content of oxygen in the coatings had an influence on the decreasing hardness and Young’s modulus and improved adhesion. There was no influence on thickness and roughness but the lowest number of droplets was noticed in the coatings obtained in pure oxygen. Key words: aluminum oxynitride, thin ceramic film, pulsed laser deposition.1. INTRODUCTION Aluminum oxynitride ceramic, acronym ALON, has been focusing interest since the 1960s [1÷3]. It has a cubic crystal structure with a spinel-type lattice (space group: Fd3m) [3÷6]. Its general chemical composition is Al(64 + x)/3O32 - xNx, where 0 ≤ x ≤ 8 [7, 8]. The most stable and stoichiometric phase is represented by Al23O27N5 (when x = 5) [1]. ALON has excellent mechanical properties with high strength and high hardness [1, 3, 9] be[...]

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