Projeto, construção e validação de um tribômetro “ball-cratering” de configuração mecânica “esfera-fixa”
Design, building and validation of a “ball-cratering” wear test equipment with “fixed-ball” mechanical configuration
Marcelo de Matos Macedo, João Henrique de Andrade Lima, Cláudio Moreira de Alcântara, Wilian da Silva Labiapari, Ronaldo Câmara Cozza
Resumo
O objetivo deste trabalho foi projetar, construir e validar um tribômetro para ensaios de desgaste micro-abrasivo, de configuração mecânica “ball-cratering” – “esfera-fixa”. Após o projeto e construção do equipamento, ensaios foram conduzidos com corpos-de-prova de aço-inoxidável ferrítico P410D com diferentes durezas; como contra-corpo, foi utilizada uma esfera de aço AISI 52100 e a lama abrasiva foi preparada com carbeto de silício preto – SiC e água destilada. Após a finalização dos ensaios, todas as crateras de desgaste foram analisadas por microscopia óptica, com o objetivo de medir o diâmetro das mesmas e calcular os respectivos volumes de desgaste. A validação do equipamento foi realizada com base no comportamento do volume de desgaste em função da dureza do corpo-de-prova e pela fundamentação teórica junto à Equação de Archard. O tribômetro apresentou excelente “reprodutibilidade”, caracterizada pelos baixos valores de desvios-padrão dos volumes de desgaste. A “funcionalidade” do mesmo foi condizente com a conceitualização científica provinda da Equação de Archard, em referência a capacidade do equipamento em gerar menores volumes de desgaste para maiores durezas superficiais.
Palavras-chave
Abstract
The purpose of this work was design, build and validate a ball-cratering wear tests tribometer of fixed-ball mechanical configuration. After the design and construction, micro-abrasive wear tests were conducted with specimen of P410D ferritic stainless steel of different hardness levels; as counter-body, was used a AISI 52100 steel and the abrasive slurry was prepared with black silicon carbide and distilled water. Finalizing the experiments, all wear craters were analyzed by optical microscope, with the aim of measure their diameters and calculate the respective wear volumes. The validation of the equipment was conducted based on the behavior of the wear volume as a function of the hardness and by Archard Equation theoretical foundation. The tribometer presented an excellent reproducibility, characterized by low values of wear volumes standard-deviation. Its functionality was consistent with the scientific conceptualization from Archard Equation, in reference of equipment capacity to generate low wear volumes related to high superficial hardnesses.
Keywords
Referências
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Submetido em:
17/11/2019
Aceito em:
16/11/2021
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