Abrasionsmekanismer i labtest och fält : Utvärdering av metoder för nötningsprovning av spetsar till pinnkultivatorer

Sammanfattning: In this master thesis two simplified and small-scale methods for two-body and three-body abrasive wear were examined. It was examined how representative the methods were compared to field-tested points in a cultivator for agriculture. A total of six points with different compositions were tested and ranked based on the test results. For the two-body test, a lathe and aluminium oxide abrasive paper with 125 μm grain size were used. For the three-body test, a lathe, paper cloth and sand with 200-700 μm grain size were used. The weight difference before and after the tests were measured and the samples were also analysed before and after the tests with scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). A ranking of the points could be established and the points with the highest wear resistance for the two tests were Marathon and Ferobide. Marathon consisted of cemented carbides in a cobalt matrix and Ferobide consisted of cemented carbides-regions in a matrix of iron, cobalt and chromium. Marathon had the highest wear resistance for the two-body test and Ferobide had the highest wear resistance for the three-body test. The tests were not a perfect representation of the field-test but there were similarities between them which shows that some parts of the tests were representative. The test that was the most representative compared to the field-test was the three-body test.