Investigation of Properties of the Zr,Hf-(Zr,Hf)N-(Zr,Hf,Me,Al)N Coatings, Where Me Means Cr, Ti, or Mo

Abstract

The article describes the results of the investigation focused on the properties of the Zr,Hf-(Zr,Hf)N-(Zr,Hf,Me,Al)N coatings, where Me means chromium (Cr), titanium (Ti), or molybdenum (Mo). These coatings have three-layer architecture, including adhesion, transition, and wear-resistant layers, while the latter, in turn, has a nanolayer structure. Despite the fact that the coatings under study have close values of hardness and critical fracture load LC2, there are noticeable differences in wear resistance during the turning of steel. The tools with the coatings under study demonstrated better wear resistance compared to an uncoated tool and the tool with the commercial ZrN coating. The best wear resistance was detected for a tool with the Zr,Hf-(Zr,Hf)N-(Zr,Hf,Ti,Al)N coating. The study of the pattern of cracking in the structure of the coatings has found that, during the cutting process, active cracking occurs in the coating with Cr, which leads to the fracture of the coating, while the process of cracking is noticeably less active in the coatings with Ti or Mo.

Evaluation of tribo-vibration characteristics of the finishing turning process of heat-resistant structural steel 20MnMoNi5-5

“…Increasing the wear resistance of cutting tools is a very urgent problem, which is solved in various ways: by creating new tool materials with improved physical, mechanical and cutting properties [1][2][3][4], by modifying the working edges of the tool with wear-resistant coatings [5][6][7][8], by assessment of the thermal load of the tool [23] and by selecting optimal technological operating modes for the tool [9][10][11]. One of the main factors that contribute to the intensification of wear processes of tool cutting materials is significant vibrations in the cutting system.…”

Influence of Niobium and Hafnium Doping on the Wear and Corrosion Resistance of Coatings Based on Zrn

“…Alternatively, a decrease in the coating hardness and grain growth occurs upon the addition of 0.5-4.2 at% Hf [32]. Finally, the Zr, Hf adhesive layer can be modified, which may affect the properties of a coating based on the (Zr,Hf)N system [33][34][35][36].…”