Goran Heffer
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View article: Influence of sample speed and impact angle on the wear of boride coatings in the mass of free abrasive particles
Influence of sample speed and impact angle on the wear of boride coatings in the mass of free abrasive particles Open
This paper presents a study on the wear of boride coatings applied to a C45E steel substrate, tested in the mass of free abrasive particles (Ottawa sand, AFS 50/70), with respect to the sample speed (v) and the impact angle (a) between the…
Microstructural analysis of flame-sprayed and PTA-deposited nickel-based self-fluxing alloy coatings Open
In this paper, the results of microstructural analyses, including optical microscopy, scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction analysis, of the Ni-based self-fluxing alloys NiCrBSi, NiCrBSi–WC,…
View article: A Low-Cost Global Navigation Satellite System Positioning Accuracy Assessment Method for Agricultural Machinery
A Low-Cost Global Navigation Satellite System Positioning Accuracy Assessment Method for Agricultural Machinery Open
The high-precision positioning and navigation of agricultural machinery represent a backbone for precision agriculture, while its worldwide implementation is in rapid growth. Previous studies improved low-cost global navigation satellite s…
View article: Resistance of modified material surfaces for agricultural tillage tools to wear by soil particles
Resistance of modified material surfaces for agricultural tillage tools to wear by soil particles Open
Agricultural tillage tools are exposed to various forms of wear during operation. Abrasive wear by soil particles is the most important wear form, and the most exposed to it are representatives of tools whose working parts are in direct co…
Effect of speed and impact angle on solid particle erosion of vanadium carbide coatings produced by thermo-reactive diffusion technique Open
This paper presents research of the solid particle erosion of conventionally and duplex treated vanadium carbide (VC) coatings produced on the C45E steel substrate by the thermo-reactive diffusion (TRD) technique. The Response Surface Meth…
View article: Influence of an uneven surface on the vibration occurrence affecting the tractor operator
Influence of an uneven surface on the vibration occurrence affecting the tractor operator Open
The paper presents a study of the influence of an uneven surface and number of tractor hours on vibration that is transmitted to the operator's hand-arm system during operation. The study was conducted on the asphalt, gravel and grass trav…
View article: Comparison of abrasion resistance of boron- and vanadium-based coatings
Comparison of abrasion resistance of boron- and vanadium-based coatings Open
This research focuses on testing of abrasion resistance of boron- and vanadium-based coatings. Coating of samples with vanadium was completed by classic and duplex procedure with previous carburization. The samples were abraded by applying…
Wear of Induction Cladded Coating in the Abrasive Mass at Various Speeds and Impact Angles Open
The wear of induction cladded coating during motion was investigated through the abrasive mass at a speed of 1.0 to 3.0 m/s and the impact angle of abrasive particles with a worn surface of 0° to 90°. Cladding was performed by using Ni-Cr-…