The durability of the working elements of hammer crushers intended for coal grinding determines the efficiency of the equipment under use and the relevance of research in this field. The service life of hammers depends on the abrasive capacity and the particle size distribution of coal, as well as on the wear conditions of working surfaces. The application expedience of laboratory methods for material wear testing intended for the recommendations concerning the use of novel materials and technologies aimed at the strenghthening of working surfaces is substantiated. An installation for the implementation of interaction patterns between a coal lump and a working surface under the conditions of impact and friction accompanied by impact has been developed. Commercial PP-Np80Kh20R3T, PP-Np90G13N4 and T-590 grade surfacing alloys, as well as experimental 230Kh8F7S2G6 and 300Kh8F7S2G4 surfacing alloys have been taken as materials under investigation. The experimental surfacing alloys have the highest level of wear resistance. Electric slag surfacing onto hammers with the use of 230Kh8F7S2G6 grade alloy for crushing large-lump coal, as well as surfacing with the use of 300Kh8F7S2G4 for crushing medium-lump coal is recommended.
Gryadunov et al. (Sat,) studied this question.