Low-temperature densification of ceramics and cermets by the intermediary stage activated sintering method
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Journal of Thermal Analysis and Calorimetry
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The article explores new concepts in order to
promote ceramic and cermet materials sintering at lower
temperatures between 1200 and 1300 C. The principle of
the new process method called intermediary stage activated
sintering (ISAS) involves the preparation of the ceramic
powder with dispersed doping agents, such as nanotubes
and fibers, which shape the pore structure at pressed pellets
with stable interconnected thin cylinders between the
grains. This feature resembles and extends the condition
found during the intermediary stage sintering, which
enhances the ions diffusion rate along tubular pores to
increase shrinkage. Carbon nanotubes (CNT) and nanofibers
are homogenized into cubic zirconia and alumina in
amounts ranging from 1 to 10 vol% at high-energy milling
devices and ultrasound disruptor under ethanol media. Ni,
Cu and Mo/MoO3 can be also added to provide tubular
channel filling. Sintering of uniaxially pressed pellets is
carried out in a dilatometer and tubular furnaces at
1200/1300 C under air, argon and controlled oxygen
partial pressure atmospheres. TG/DTA/MS analyses of
sample pellets reveal the oxidation and gas release temperature
and duration. The results demonstrate the ISAS
process concept is valid since it further increases the
ceramic final density by 8% of the theoretical density at
1200 C, leading to close the porosity at 1300 C, compared to 1500–1600 C temperatures at conventional
process. Short CNT and cellulose nanofiber were found to
be the best additives in this sense.
Como referenciar
RESTIVO, THOMAZ A.G.; DURAZZO, MICHELANGELO; MELLO-CASTANHO, SONIA R.H. de; MOREIRA, ANA C.; GRACIANO, SERGIO; TELLES, VICTOR B.; TENORIO, JORGE A.S. Low-temperature densification of ceramics and cermets by the intermediary stage activated sintering method. Journal of Thermal Analysis and Calorimetry, v. 131, n. 1, p. 249-258, 2018. DOI: 10.1007/s10973-017-6560-5. Disponível em: http://repositorio.ipen.br/handle/123456789/27912. Acesso em: 30 Dec 2025.
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.