Thermal properties of the nitrogen-rich Ca-α-Sialons

Cai, Yanbing; Nygren, Mats; Shen, Zhijian; Grîns, Jêkabs; Esmailzadeh, S.

doi:10.1016/j.jeurceramsoc.2009.07.015

Cited by 1 publication

(2 citation statements)

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“…Pellets of the mixtures, compacted using a steel die, were hot pressed in BN‐coated graphite dies in nitrogen atmosphere in a graphite‐resistance furnace at 2073 K for 4 h under 35 MPa uniaxial pressure. Details of the sintering process, phase assemblages after sintering, and thermal stability of the phases are presented in Cai and colleagues 20–22,39 . The densities of the hot‐pressed samples were measured by the Archimedes method in water.…”

Section: Methodsmentioning

confidence: 99%

“…Details of the sintering process, phase assemblages after sintering, and thermal stability of the phases are presented in Cai and colleagues. [20][21][22]39 The densities of the hotpressed samples were measured by the Archimedes method in water. Microstructural observations of polished and fractured surfaces were carried out by scanning electron microscopy (SEM, JEOL JSM 880, Tokyo, Japan) and transmission electron microscopy (TEM, JEOL JEM 4010).…”

Section: Methodsmentioning

confidence: 99%

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High-Temperature Mechanical Spectroscopy of Nitrogen-Rich Ca-α-SiAlON Ceramics

Mazaheri

Mari

Schaller

et al. 2011

Journal of the American Ceramic Society

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Nitrogen‐rich Ca–α‐SiAlON ceramics made with different starting powder compositions have been studied by high‐temperature mechanical spectroscopy in parallel with compressive deformation in a spark plasma sintering equipment. The mechanical loss spectra measured upon heating show a relaxation peak at about 1150 K and a high‐temperature exponential background at higher temperatures (>1400 K), which are attributed to the α‐relaxation in the glassy phase and to grain‐boundary sliding, respectively. A theoretical interpretation of the results shows that the peak position is mainly a function of glass viscosity. The amplitude of the peak is not only affected by the glassy phase quantity but also depends on the restoring force due to grain elasticity. Therefore, despite a higher amount of glassy phase specimens containing elongated grains may show a lower peak. The amplitude of the internal friction peak corresponding to α‐relaxation can be used to predict the compression creep of silicon‐nitride‐based ceramics.

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Section: Methodsmentioning

confidence: 99%