Cylindrical samples of AISI 1020 steel were nitrided, using the techniques of conventional plasma nitriding and cathodic cage. In the latter, the samples are kept at floating potential, inside of a cage that works as a cathode and to shield the samples from the cathodic potential. A systematic study was conducted in order to evaluate the efficiency of this technique in the elimination of edge effect, in comparison with conventional plasma nitriding. In addition, another comparative study of the phases obtained using the conventional plasma nitriding and nitriding with cathodic cage was performed. Two metallic cages were used, one made of austenitic stainless AISI 316 and other one made of AISI 1020 steel, to prove the effect of deposition in nitriding with cathodic cage. The samples which were nitrided by this new technique had shown nitriding rates, crystalline phases, and microhardness, similar to those samples which were nitrided conventionally. However, it was possible to confirm the elimination of edge effect through the characterization by optical microscopy and by microhardness test along the samples surfaces. The samples were characterized by optical microscopy, microhardness tests and X-ray diffraction.
Abstract-The ceramic industry has manufactured activities which require great physical effort on the part of its employees, enabling the appearances of Work-Related Musculoskeletal Disorders. Therefore, this article aims to realize the ergonomic diagnosis of a ceramics industry in the city of Teresina/Brazil. In this way, visits were carried out to this industry, applying the Couto's checklist to perform a biomechanical characterization of the labor sector, linking the possible musculoskeletal risks. The results showed that brick and tile catcher offer a great potential for musculoskeletal risks to their workers, while other sectors have virtually no risks. Therefore, some mitigation measures are suggested, as well as an overview of future steps for ergonomic improvement of the study target company.Index Terms-Work-related musculoskeletal disorders, ceramic industry, couto checklist.
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