Effect of LZSA glass-ceramic addition on the erosive wear of pressureless sintered alumina
Autor: | C. A. Faller, Oscar Rubem Klegues Montedo, Carlos Perez Bergmann, Pâmela Cabreira Milak, Agenor De Noni |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Materials science
Glass-ceramic Mining engineering. Metallurgy erosive wear General Engineering TN1-997 Engineering (General). Civil engineering (General) alumina composites law.invention law General Earth and Planetary Sciences Composite material TA1-2040 LZSA glass-ceramic General Environmental Science |
Zdroj: | REM-International Engineering Journal v.73 n.2 2020 REM-International Engineering Journal Fundação Gorceix (FG) instacron:FG REM: International Engineering Journal, Vol 73, Iss 2, Pp 179-188 (2020) |
Popis: | This study aims to evaluate the influence of the 11.6Li2O-16.8ZrO2-68.2SiO2-3.4Al2O3 (mol%) glass-ceramic addition (LZSA, 7 to 21 vol%) on the erosive wear of alumina in comparison to values of pure alumina obtained from the literature. Thus, composites were prepared from three commercial alumina of different initial particle sizes. Specimens were obtained by uniaxial pressing. Sintering temperatures and holding times were found to be different for each composite. The erosive wear test was carried out in an apparatus based on the standard ASTM G 76-4. The volumetric erosive wear (T vol) was correlated to the initial mean particle size of alumina, LZSA glass-ceramic content, average grain size of sintered alumina (AGS), porosity (P), elastic modulus, fracture toughness, natural defect size, and fracture energy based on a correlation matrix of statistical analyses. The experimental data of Tvol fit very well with P and AGS, individually, in a 3rd degree equation, except for composite AF21. Composite AF21, i.e. 21 vol% LZSA added to 0.5 µm mean particle size alumina (AF, fine alumina) and sintered at 1470 oC for 3 h, showed interesting results of T vol(2.05 × 10-8 m3·kg-1) related to the other investigated compositions, which varied from 1.90-4.37 × 10-8 m3·kg-1, and those existing in literature (0.55 × 10-8 to 10.78 × 10-8 m³·kg-1), mostly when considering the lower sintering temperature (1470 against 1600 oC). Thus, although the AC7 composite had shown the lowest Tvol value (1.90 × 10-8 at 1600 oC/7 h), the composite AF21 can be considered as the best result because of its lower sintering temperature and holding time (2.05 × 10-8 at 1470 oC/4 h). The formation of a viscous liquid phase, which crystallizes during the controlled cooling in the microstructure of the LZSA/alumina-based composites, improves the erosive wear of the alumina. |
Databáze: | OpenAIRE |
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