Effects of Cr Concentration on the Structure and the Electrical and Optical Properties of Ti-Al-Cr-N Thin Films Prepared by Means of Reactive Co-Sputtering
Abstract:Thin films of Ti-Al-Cr-N were deposited onto glass substrates by means of the reactive magnetron co-sputtering of pure Cr and TiAl alloy targets in an atmosphere of Ar and N2. This investigation was carried out by adjusting the Cr-target power in order to increase the Cr amount in the films. The crystal structure of the films was investigated via X-ray diffraction (XRD). The elemental composition of the coatings was determined using Auger electron spectroscopy (AES). The electrical resistivity was measured usi… Show more
“…The cutting inserts were pre-coated with a multifunctional electroconductive TiN coating of 3.8-4.0 µm thickness. The thickness of the coating was chosen based on practical experience, since coatings with a thickness of less than 1.8-2.0 µm exhibit uneven electroconductive properties when deposited on insulating ceramic samples [72]. At the same time, this classical composition of the TiN coating provides excellent wear-resistant properties [73].…”
This paper is devoted to the problem of wear resistance in square Si3N4 ceramic cutting inserts, which exhibit high hardness and strength, in combination with brittleness, in machining super alloys (e.g., a nickel-based alloy of Inconel 718 type) for aviation purposes, when subjected to increased mechanical and thermal loads. Microtextures were proposed to reduce the intensity of the contact loads on the pad between the cutting edge and the workpiece. The simulation of the mechanical and thermal loads demonstrated the superior ability of the faces with the preformed microgrooves (125 µm in width) compared to microwells (ø100 µm). The tense state was 4.97 times less, and there were 2.96 times fewer deformations. It was shown that they hamper the development of thermal fields at 900 °C. Two types of microtextures (210 µm-wide microgrooves and microwells 80 µm in diameter) were produced on the rake faces of the cutting inserts via an innovative and integrated approach (the electrical discharge machining of dielectrics using multifunctional and TiO2-assisted powder), and a conductive and wear-resistant TiN coating was deposited via magnetron vacuum plasma sputtering (95%N2/5%Ar). The failure criterion in turning was 400 µm. An increase of 30% in tool wear resistance was demonstrated.
“…The cutting inserts were pre-coated with a multifunctional electroconductive TiN coating of 3.8-4.0 µm thickness. The thickness of the coating was chosen based on practical experience, since coatings with a thickness of less than 1.8-2.0 µm exhibit uneven electroconductive properties when deposited on insulating ceramic samples [72]. At the same time, this classical composition of the TiN coating provides excellent wear-resistant properties [73].…”
This paper is devoted to the problem of wear resistance in square Si3N4 ceramic cutting inserts, which exhibit high hardness and strength, in combination with brittleness, in machining super alloys (e.g., a nickel-based alloy of Inconel 718 type) for aviation purposes, when subjected to increased mechanical and thermal loads. Microtextures were proposed to reduce the intensity of the contact loads on the pad between the cutting edge and the workpiece. The simulation of the mechanical and thermal loads demonstrated the superior ability of the faces with the preformed microgrooves (125 µm in width) compared to microwells (ø100 µm). The tense state was 4.97 times less, and there were 2.96 times fewer deformations. It was shown that they hamper the development of thermal fields at 900 °C. Two types of microtextures (210 µm-wide microgrooves and microwells 80 µm in diameter) were produced on the rake faces of the cutting inserts via an innovative and integrated approach (the electrical discharge machining of dielectrics using multifunctional and TiO2-assisted powder), and a conductive and wear-resistant TiN coating was deposited via magnetron vacuum plasma sputtering (95%N2/5%Ar). The failure criterion in turning was 400 µm. An increase of 30% in tool wear resistance was demonstrated.
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