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Article

Protective Coatings for Mining Conical Picks Considering Rock Strength and Rock Abrasivity

by
Kamil Mucha
1,* and
Andrzej N. Wieczorek
2
1
Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, A. Mickiewicza 30 Street, 30-059 Kraków, Poland
2
Faculty of Mining, Safety Engineering and Industrial Automation, Silesian University of Technology, Akademicka 2 Street, 44-100 Gliwice, Poland
*
Author to whom correspondence should be addressed.
Coatings 2025, 15(6), 637; https://doi.org/10.3390/coatings15060637
Submission received: 31 March 2025 / Revised: 15 May 2025 / Accepted: 23 May 2025 / Published: 25 May 2025
(This article belongs to the Section Corrosion, Wear and Erosion)

Abstract

The selection of mining cutting tools used on the cutting heads of roadheaders and shearers in hard coal mines is primarily based on the uniaxial compressive strength (UCS) of the rock. However, selecting cutting tools solely on the basis of a single parameter characterizing the rock has proven to be insufficient. Therefore, the aim of the presented study was to develop guidelines for the selection of cutting tools with appropriate protective coatings on the working parts, based not only on the mechanical strength properties of rocks, but also on their abrasivity. For the study, twelve rock samples were collected from five different Polish hard coal mines. For each rock type, the UCS (uniaxial compressive strength), BTS (Brazilian tensile strength), and chemical composition (determined using wavelength-dispersive X-ray fluorescence, WD-XRF) were measured, along with the rock abrasivity index Wz, determined using a proprietary method developed at the AGH University of Krakow. The test results were compared with the calculated specific pick wear, defined as the number of picks consumed (replaced) per 1000 m3 of excavated material. As a result, a classification of rocks based on their UCS and abrasivity was developed, along with recommendations for selecting conical picks with suitable protective coatings on the working parts.
Keywords: mining conical picks; rock strength; rock abrasivity; wear; protective coatings mining conical picks; rock strength; rock abrasivity; wear; protective coatings

Share and Cite

MDPI and ACS Style

Mucha, K.; Wieczorek, A.N. Protective Coatings for Mining Conical Picks Considering Rock Strength and Rock Abrasivity. Coatings 2025, 15, 637. https://doi.org/10.3390/coatings15060637

AMA Style

Mucha K, Wieczorek AN. Protective Coatings for Mining Conical Picks Considering Rock Strength and Rock Abrasivity. Coatings. 2025; 15(6):637. https://doi.org/10.3390/coatings15060637

Chicago/Turabian Style

Mucha, Kamil, and Andrzej N. Wieczorek. 2025. "Protective Coatings for Mining Conical Picks Considering Rock Strength and Rock Abrasivity" Coatings 15, no. 6: 637. https://doi.org/10.3390/coatings15060637

APA Style

Mucha, K., & Wieczorek, A. N. (2025). Protective Coatings for Mining Conical Picks Considering Rock Strength and Rock Abrasivity. Coatings, 15(6), 637. https://doi.org/10.3390/coatings15060637

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