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Camerini R.V.,Federal University of Rio Grande do Sul | Camerini R.V.,Jomon Industria de Artefatos Ceramicos Ltda | De Souza R.B.,Federal University of Rio Grande do Sul | De Souza R.B.,Jomon Industria de Artefatos Ceramicos Ltda | And 3 more authors.
Wear | Year: 2011

Micro-abrasive wear test, also called ball cratering test, is normally used to investigate the wear behavior of hard bulk materials or wear-resistant coatings. In this work, this test was used to investigate the wear behavior of metallic samples. The results showed that the embedment of abrasive particles and the formation of grooves in the crater's surface may induce to artificially small wear coefficient when the test is applied to ductile materials. Surface grooving was observed when the normal force applied by the sphere was higher than a critical value. This critical value depends on the hardness and mechanical strength of the material being tested. © 2011 Elsevier B.V. Source


Pereira D.,Federal University of Rio Grande do Sul | Pereira D.,Jomon Industria de Artefatos Ceramicos Ltda | Biasibetti G.R.S.,Federal University of Rio Grande do Sul | Biasibetti G.R.S.,Jomon Industria de Artefatos Ceramicos Ltda | And 3 more authors.
Materials and Manufacturing Processes | Year: 2014

In this study, we have investigated the sintering of mullite by three different methods: (i) reaction sintering by thermal decomposition of kaolinite, followed by reaction with alumina; (ii) reaction sintering of mullite by solid state reaction of pure silica and alumina; (iii) sintering of commercial electrofused mullite powder. In all the cases, the mixtures of powders were compacted by dry pressing and sintered at temperatures between 1000°C and 1600°C using a resistive furnace. The phase identification was performed by X-ray difractometry, and the microstructure was studied by scanning electron microscopy. Density and porosity were obtained using the Archimedes method. The flexural strength and the Vickers hardness were measured to evaluate the mechanical properties. Sintered ceramic bodies with a high content of mullite were produced following the three investigated routes. In both the second and third methods a residual phase of alumina was observed on the sintered bodies. The higher values of density and bending strength were achieved by specimens produced by the first method and sintered at 1600°C. © 2014 Taylor & Francis Group, LLC. Source

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