Journal
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
Volume 13, Issue 3, Pages 345-350Publisher
UNIV FED SAO CARLOS, DEPT ENGENHARIA MATERIALS
DOI: 10.1590/S1516-14392010000300011
Keywords
microwave processing; alumina; sintering
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Funding
- FAPESQ/MCT/CNPq (State of Paraiba Research Foundation) [003/03, 004/06]
- CNPq (National Council for Science and Technology) [476382/04-1, 471415/04-9]
- FAPESP (State of Sao Paulo Research Foundation) [05/60095-9, 06/50121-5]
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Commercially available alumina powder with high-purity submicrometer particle size and narrow particle size distribution was fully densified by a microwave hybrid fast firing technique. The alumina compacts were surrounded by susceptor material, which helped the heating of the samples, and sintered in a microwave oven at a frequency of 2.45 GHz and a power level of 1.8 kW. The sintered samples reached densities of 99% in sintering cycles of 30 to 40 minutes, a much shorter time than conventional sintering processes. The sintered samples showed uniform microstructures with powder particle size/average grain size rations higher than 1:2.
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