In situ measurement of the shrinkage during microwave sintering

Marinel, Sylvain; Savary, Etienne

doi:10.1016/j.jmatprotec.2008.12.005

Cited by 18 publications

(10 citation statements)

References 6 publications

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“…In comparing the volumetric contraction of the samples also obtained from these two sintering methods, Marinel and Savary [19] also found similar results to those previously reported, however they evaluated copper oxide.…”

Section: Discussionsupporting

confidence: 85%

Surface roughness and volumetric contraction of a Y-TZP ceramic sintered by microwave energy and by resistive heating

Barchetta

Nanni

Miranda

et al. 2017

BDS

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124 ResumoObjetivo: avaliar uma cerâmica de zircônia estabilizada com óxido de ítrio (Y-TZP) sinterizada por um protocolo em micro-ondas quanto à contração volumétrica e a rugosidade superficial. Material e Métodos: Vinte e quatro discos (n = 24) de Y-TZP foram fresados em CAD / CAM para padronização do tamanho. A dimensões finais médias dos corpos de prova foram de 15 mm X 1,6 mm. As amostras foram divididas em 2 grupos (n = 12): protocolo de sinterização convencional por aquecimento resistivo (C -Controle) e protocolo de sinterização por microondas (MO -experimental). A caracterização das amostras foi realizada pela avaliação da rugosidade superficial, com um rugosímetro (parâmetros Ra e Rz) e da contração volumétrica, medida com um micrômetro manual. Os dados foram estatisticamente avaliados pelos testes de t-Studant e U-Mann-Whitney (α=0,05). Resultados: Os resultados de rugosidade foram: 0,25 μm ± 0,02 (Ra) e 2,68 μm ± 0,666 (Rz) para o MO; e 0,26 μm ± 0,04 (Ra) e 2,73 μm ± 0,461 (Rz) para o grupo C (Ra: p = 0,19; Rz: p = 0,81). A contração volumétrica foi de: MO (21,02% ± 2,70) e C (20,10% ± 0,52) (p = 0,274). Conclusão: os métodos de sinterização convencionais e de microondas são semelhantes, no que diz respeito à rugosidade superficial e retração de volume da cerâmica dental Y-TZP. ABsTRACTObjectives: The aim of this study was to evaluate a Y-TZP ceramic sintered by a microwave protocol on volume shrinkage and surface roughness. Material and Methods: Twenty four (N=24) Y-TZP discs were fabricated by milling in CAD/ CAM for size standardization. The mean final dimensions of the specimens were 15 mm X 1.6 mm. Samples were divided into 2 groups (n=12): conventional resistive heating sintering protocol (C -Control) and microwave sintering protocol (MO -experimental). For the characterization of the specimens, surface roughness (Ra and Rz parameters) was evaluated with a roughness tester, and volume shrinkage was measured with a hand micrometer. Data were statistically evaluated by Student's t and Mann-Whitney U tests (α=0.05). Results:The roughness results were: 0.25 μm ± 0.02 (Ra) and 2.68 μm ± 0.666 (Rz) for the MO samples; 0.26 μm ± 0.04 (Ra) and 2.73 μm ± 0.461 (Rz) for the C group (Ra: p = 0.19; Rz: p = 0.81). The shrinkage results was: MO (21.02% ± 2.70) and C (20.10% ± 0.52) (p = 0.274). Conclusion:The conventional and microwave sintering methods were similar regarding surface roughness and volume shrinkage of Y-TZP dental ceramic.

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Section: Discussionsupporting

confidence: 85%

Surface roughness and volumetric contraction of a Y-TZP ceramic sintered by microwave energy and by resistive heating

Barchetta

Nanni

Miranda

et al. 2017

BDS

View full text Add to dashboard Cite

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“…However pyrometric measurement requires a calibration procedure, which can be tricky in the case of a microwave oven. Different methods, such as optical dilatometry or telemetry [14][15][16], have been proposed to measure specimen shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Development of an instrumented and automated single mode cavity for ceramic microwave sintering: Application to an alpha pure alumina powder

et al. 2015

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“…Patents on microwave dilatometry date back to 1994 and were developed by Kimrey et al [23]; these instruments used a contact method for measuring thermal dilation. Most recent work by Marinel et al [24] and Barber et al [25] used non-contact methods. The dilatometer set-up developed for this study used a push-rod assembly (see Figure 1) due to ease of availability and to avoid issues with emissivity, which is a function of temperature.…”

Section: Microwave Hybrid Dilatometrymentioning

confidence: 99%

Effect of electric field (2.45 GHz) on sintering behavior of fully stabilized zirconia

Thridandapani

Folz

Clark

2015

Journal of the European Ceramic Society

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Numerous reports presented in the literature have shown that microwave sintering results in reduction of processing temperature/time required for densification in some materials when compared to conventional sintering. While faster sintering regimes may look promising, it is important to understand why microwaves appear to enhance the sintering phenomena. It is speculated that the electric field associated with microwave energy is enhancing flux, leading to accelerated densification. Enhancement in flux is a result of an increase in driving force, in the transport coefficient, or both. This study examines the sintering behavior of 8 mol % yttria-zirconia at various values of electric field intensity (frequency being constant, 2.45 GHz) to understand whether the driving force or transport coefficient terms in the flux equation lead to enhanced densification. The transport coefficient term shows an increasing trend with an increase in electrical field intensity. These results indicate that the underlying reason for the increase in the transport coefficient term is due to a shift in diffusion path, from volume to grain boundary diffusion.

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In situ measurement of the shrinkage during microwave sintering

Cited by 18 publications

References 6 publications

Surface roughness and volumetric contraction of a Y-TZP ceramic sintered by microwave energy and by resistive heating

Surface roughness and volumetric contraction of a Y-TZP ceramic sintered by microwave energy and by resistive heating

Development of an instrumented and automated single mode cavity for ceramic microwave sintering: Application to an alpha pure alumina powder

Effect of electric field (2.45 GHz) on sintering behavior of fully stabilized zirconia

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