Y-TZP dental ceramics: Sintering process improvement using microwave energy
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2018
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INTERNATIONAL CONGRESS ON CERAMICS, 7th; CONGRESSO BRASILEIRO DE CERÂMICA, 62.
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Conventional sintering techniques of yttria-tetragonal zirconia polycrystals (Y-TZP)
ceramics have presented limitations regarding the sintering time and temperature,
increasing the cost of the final dental and biomedical products. Herein, microwave
sintering comes to be an interesting alternative by providing fast heating, high
densification and grain size control, decreasing the total time to produce the ceramic.
The aim of this study was to compare the effect of microwave sintering of a pre-sintered
commercial dental Y-TZP ceramic and a Y-TZP produced from powders synthesized
in a laboratory scale by the copreciptation route. Densification, fracture toughness,
grain size and crystalline phase quantification of sintered samples were evaluated. The
synthetized and commercial (Vita Zahnfabrik, Germany) groups were submitted to
1450 °C and 1350 °C sintering temperature for 15, 30 and 60 minutes. Both groups
sintered at 1450°C for 15 minutes and 30 minutes showed the higher densification
results (98% concerning to theoretical density). All the samples sintered at 1350 °C
achieved 96TD% independent of the sintering time. XRD quantitative phase analysis
indicates that samples are formed by 89% tetragonal and 11% cubic phases (0,833
standard deviation), except for the group prepared from coprecipitated powders
sintered at 1450oC for 30 minutes, that presented 79% and 21% of tetragonal and
cubic phases, respectively. Therefore, microwave sintering allows the preparation of
dense ceramics with high tetragonal phase content. The sintering time and
temperature induced differences at the Y-TZP microstructure.
Como referenciar
SOLANO, A.; ARATA, A.; LIMA, N.B.; USSUI, V.; LAZAR, D.R.R. Y-TZP dental ceramics: Sintering process improvement using microwave energy. In: INTERNATIONAL CONGRESS ON CERAMICS, 7th; CONGRESSO BRASILEIRO DE CERÂMICA, 62., June 17-21, 2018, Foz do Iguaçu, PR. Abstract... p. 122-122. Disponível em: http://repositorio.ipen.br/handle/123456789/29683. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.