Investigation of Microdiamonds Obtained by the Oxygen-Acetylene Torch Method

Abstract

The results of experiments on the synthesis of micro- and nano-diamonds by an oxy-acetylene torch on the surface of the pre-deposited copper thin films are presented in this article. The influence of thickness of a buffer copper film and the ratio of the concentrations of oxygen and acetylene on the structure of the deposited samples has been studied in the course of the conducted experiments. The studies by Raman scattering and scanning electron microscopy showed that the synthesis of micro- and nano-diamonds occurs under certain experimental conditions. From the results of the analysis of the obtained samples by the methods of Raman scattering and scanning electron microscopy, it was determined that the deposition time of the copper films and consequently its thickness mainly influence on the structure formation of diamond crystals. On copper films grown for 30 min, the Raman scattering method showed a shift of the diamond peak from the standard (1332 cm‒1) to the low-frequency band (1331.3 cm‒1), which may occur after the presence of stress in the crystals. The results of the investigation showed that with increasing of synthesis time take place smoothing of the facets of crystallites (scanning electron microscopy) and decrease in intensity of the diamond peaks (Raman scattering method).

Microstructure and tribological study of TiAlCN and TiTaCN coatings

“…Hard protective coatings greatly contribute to increasing wear resistance and increasing the service life of components and machine structures that are constantly subjected to mechanical and chemical degradation due to wear processes [ [1], [2], [3]]. The use of hard protective coatings such as TiC [4], TiN [5], TiCN [6], TiAlN [7], TiSiC [8], thin multi-layer coatings [9], diamond-like films [ [10], [11]], and others are a suitable way to protect machine parts or tools from environmental hazards and wear. In these works, it is noted that coatings based on titanium carbides and nitrides provide good wear resistance due to a combination of ductility and hardness, and high adhesion to the substrate.…”

Comparative Study of Tribological and Corrosion Characteristics of TiCN, TiCrCN, and TiZrCN Coatings

“…Hard protective coatings greatly contribute to the wear and corrosion resistance of metals/metal alloys [1][2][3][4][5]. The use of hard protective coatings such as TiC [6], TiN [7], TiCN [8], TiAlN [9], TiSiC [10], Al 2 O 3 [11], ZrTiCN [12], diamond-like films [13,14], and others is a suitable way to protect machine parts or tools from the harmful effects of the environment and wear. In these works, it is noted that coatings based on titanium carbides and nitrides provide good wear and corrosion resistance due to a combination of ductility and hardness, and high adhesion to the substrate.…”