Comparative Investigations of AlCrN Coatings Formed by Cathodic Arc Evaporation under Different Nitrogen Pressure or Arc Current

Abstract

Tools and machine surfaces are subjected to various types of damage caused by many different factors. Due to this, the protecting coatings characterized by the best properties for a given treatment or environment are used. AlCrN coatings with different compositions, synthesized by different methods, are often of interest to scientists. The aim of the presented work was the deposition and investigation of two sets of coatings: (1) formed in nitrogen pressure from 0.8 Pa to 5 Pa and (2) formed at arc current from 50 A to 100 A. We study relationships between the above technological parameters and discuss their properties. Coatings formed at nitrogen pressure (pN2) up to 3 Pa crystallize both in hexagonal AlN structure and the cubic CrN structure. For pN2 > 3 Pa, they crystallize in the CrN cubic structure. Crystallite size increases with nitrogen pressure. The coatings formed at different arc currents have a cubic CrN structure and the crystallite size is independent of the current. The adhesion of the coatings is very good, independent of nitrogen pressure and arc current.

Influence of regeneration process parameters on geometry and defects of clearance surface of planer knives used in wood planing process

“…In some cases, wear in the form of cracks and material loss or abrasive wear may be so great that it requires an appropriate knife sharpening strategy [10,15], especially in the case of CrCN/CrN or AlCrN-coated planing blades. Those layers, formed by cathodic arc evaporation, have the critical force in the scratch test above 77 N and show HF1 class (according to Daimler-Benz test), which means they possess proper adhesion properties and are characterized by good wear resistance, as proved by an international team in [16,17].…”

“…These values in Figs. 16,17,18,19 are indicated by the dashed line and the preferred range (shaded area). The reference point here was the set of values of a given parameter obtained while conducting measurements for new knives, sharpened by the manufacturer.…”

“…However, considering that the calculated statistical test values for asymmetry (Z g1 ) and kurtosis (Z g2 ) mostly range between − 1.96 and + 1.96 (critical value of a normal distribution), the results can be considered acceptable evidence The following graphs (Figs. 17,18,19) show the variability of the distribution of measuring points determining the surface roughness in relation to the feed rate and the grinding wheel rotational speed, along with the grinding depth. The graphs show the basic statistics: 25% and 75% percentiles, the range defining the limit of outliers, defined as 1.5 of the interquartile range, as well as the median and mean values.…”

EFFECT OF ARC CURRENT ON MECHANICAL PROPERTIES OF AlCrN COATINGS DEPOSITED USING CATHODIC ARC EVAPORATION

“…The properties of the coatings depend not only on the method of their synthesis, but also on the technological parameters of the process: substrate temperature [1], reactive gas pressure [2,3], substrate bias voltage [4,5], but also the power during deposition (MS) or the arc current (CAE) [5,6]. Due to the better mechanical properties of coatings formed by the CAE method compared to MS [7], the former method is used more often.…”

Indentation of Thin Coatings: Theoretical and Experimental Investigation

“…This method is also used to study the mechanical properties of biological tissues [9]- [12]. In addition, in some cases, the use of this method provides predictable results when indenting material layers, when the penetration depth does not exceed 10% of its thickness [13]- [15]. However, with a significant difference in Young's moduli of the layers, the reconstructed value of Young's modulus can be noticeably underestimated or overestimated.…”