Inorganic Materials: Applied Research, Feb 1, 2022
Abstract The results of a study of the tribotechnical properties of solid lubricating coatings ob... more Abstract The results of a study of the tribotechnical properties of solid lubricating coatings obtained on the VK6 hard alloy (94% WC + 6% Co) as a result of thermohydrochemical treatment (THCT) in a hydrosol based on silver graphite are presented. A multidimensional technological optimization of the composition of the medium and the temperature-time parameters of the THCT process was carried out according to the coefficient of friction of the obtained solid lubricating coatings. Using mathematical models, diagrams “process parameters–property” were constructed. Processing according to the optimal mode of THCT allows, in the absence of lubrication, to reduce the coefficient of friction of a hard-alloy surface by 3.5 times compared with an untreated one.
The quality of bearing production has an impact not only on their reliability and lifetime, but a... more The quality of bearing production has an impact not only on their reliability and lifetime, but also on the dynamic load of the working and living environment by excessive vibration and thus also noise. The intensity of the noise emitted by a bearing which is perceived by man characterizes the quality of its production. Reducing the dynamic load of mechanical systems and their components is reflected in the working environment by reducing noise emissions and immissions. The article proposes an objective method of bearing quality assessment based on measuring vibro-acoustic parameters of dynamic load of a new bearing using FFT analysis and the magnitude of the amplitude of bearing vibration acceleration and compares it with a subjective method that also uses the human auditory organ to assess bearing quality. The results of vibro-acoustic measurements were analysed in terms of vibration intensity and the noise of the produced bearings. The proposed objective methodology was compared with the subjective evaluation of the quality of bearings and the results of this methodology matched. The proposed methodology is applicable to all types of bearings, and it is possible to automate this methodology in the production process.
The results examination of the tribotechnical properties for solid lubricant coatings, obtained o... more The results examination of the tribotechnical properties for solid lubricant coatings, obtained on hard alloy ВК6 (94 %WC+6 %Co) by thermo-hydrochemical treatment (THCT) in a hydrosol based on silver graphite, are presented. The multidimensional technological optimization of the medium composition and the temperature-time parameters of the process was performed for the friction coefficient of the obtained solid lubricant films. The diagrams “property vs. process parameters” were plotted using the obtained mathematical expressions. Treatment with optimal regime permits decreasing the friction coefficient of the hard alloy surface in 3,5 as compared with untreated.
Inorganic Materials: Applied Research, Feb 1, 2022
Abstract The results of a study of the tribotechnical properties of solid lubricating coatings ob... more Abstract The results of a study of the tribotechnical properties of solid lubricating coatings obtained on the VK6 hard alloy (94% WC + 6% Co) as a result of thermohydrochemical treatment (THCT) in a hydrosol based on silver graphite are presented. A multidimensional technological optimization of the composition of the medium and the temperature-time parameters of the THCT process was carried out according to the coefficient of friction of the obtained solid lubricating coatings. Using mathematical models, diagrams “process parameters–property” were constructed. Processing according to the optimal mode of THCT allows, in the absence of lubrication, to reduce the coefficient of friction of a hard-alloy surface by 3.5 times compared with an untreated one.
The quality of bearing production has an impact not only on their reliability and lifetime, but a... more The quality of bearing production has an impact not only on their reliability and lifetime, but also on the dynamic load of the working and living environment by excessive vibration and thus also noise. The intensity of the noise emitted by a bearing which is perceived by man characterizes the quality of its production. Reducing the dynamic load of mechanical systems and their components is reflected in the working environment by reducing noise emissions and immissions. The article proposes an objective method of bearing quality assessment based on measuring vibro-acoustic parameters of dynamic load of a new bearing using FFT analysis and the magnitude of the amplitude of bearing vibration acceleration and compares it with a subjective method that also uses the human auditory organ to assess bearing quality. The results of vibro-acoustic measurements were analysed in terms of vibration intensity and the noise of the produced bearings. The proposed objective methodology was compared with the subjective evaluation of the quality of bearings and the results of this methodology matched. The proposed methodology is applicable to all types of bearings, and it is possible to automate this methodology in the production process.
The results examination of the tribotechnical properties for solid lubricant coatings, obtained o... more The results examination of the tribotechnical properties for solid lubricant coatings, obtained on hard alloy ВК6 (94 %WC+6 %Co) by thermo-hydrochemical treatment (THCT) in a hydrosol based on silver graphite, are presented. The multidimensional technological optimization of the medium composition and the temperature-time parameters of the process was performed for the friction coefficient of the obtained solid lubricant films. The diagrams “property vs. process parameters” were plotted using the obtained mathematical expressions. Treatment with optimal regime permits decreasing the friction coefficient of the hard alloy surface in 3,5 as compared with untreated.
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Papers by Ľubomír Šooš