Wear resistant boron carbide compacts produced by pressureless sintering |
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| Affiliation: | 1. Instituto de Física, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, Rio Grande do Sul, Brazil;2. PGCIMAT, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, Rio Grande do Sul, Brazil;3. Instituto de Matemática, Estatística e Física, Universidade Federal do Rio Grande, 96203-900 Rio Grande, Rio Grande do Sul, Brazil;4. Departamento de Materiais, Escola de Engenharia, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, Rio Grande do Sul, Brazil;1. Center of Functional Nano-Ceramics, National University of Science and Technology MISiS, Moscow 119049, Russia;2. Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA;1. Department of Condensed Matter Physics, University of Sevilla, 41012 Sevilla, Spain;2. Department of Materials, University of Oxford, OX1 3PH, UK;1. Departamento de Física de la Materia Condensada, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain;2. School of Engineering, Brown University, Providence, RI 02912, USA |
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| Abstract: | Boron carbide compacts were produced by pressureless sintering at 2200 °C/2 h and 2250 °C/2 h in Ar atmosphere, using a starting powder with a particle size smaller than 3 µm. Effects of carbon addition (3.5 wt%) and methanol washing of the starting powder were investigated on the densification, Vickers hardness, and micro-abrasive wear resistance of the samples. The removal of oxide phases by methanol washing allowed the production, with no sintering additive, of highly densified (93.6% of theoretical density), hard (25.4 GPa), and highly wear resistant (wear coefficient =2.9×10–14 m3/N.m) boron carbide compacts sintered at 2250 °C. This optimized combination of properties was a consequence of a reduced grain growth without the deleterious effects associated to the carbon addition. Methanol washing of the starting powder is a simple and general approach to produce, without additives, high quality, wear resistant boron carbide compacts by pressureless sintering. |
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| Keywords: | A Sintering C Wear resistance C Hardness D Carbides |
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