Nitride Ceramics

Hampshire, Stuart

doi:10.1002/9783527603978.mst0119

Cited by 5 publications

(8 citation statements)

References 119 publications

(107 reference statements)

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“…The orientation relationship (OR) between AlN (P6 3 mc) and β‐Si 3 N 4 (P6 3 /m) also was investigated. It was found that the AlN crystallites forming adjacent to β‐Si 3 N 4 exhibit:

{0001}_{AlN} / / {0001}_{{Si}_{3} N_{4}}

…”

Section: Resultsmentioning

confidence: 99%

Ionic interdiffusion as interaction mechanism between Al and Si₃N₄

et al. 2019

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Al‐Si3N4 couples were heat‐treated at 850‐1150°C for 250 hours. The thickness of the interacted area was measured by scanning electron microscopy (SEM) and scanning/transmission electron microscopy (TEM/STEM). The interaction rate increases exponentially with inverse temperature, with an activation energy of 194.23 kJ/mol and diffusion pre‐coefficient of 5 × 10−9 m2/s, indicating that the interaction is diffusion‐dependent. As the results showed, the interfacial area is comprised of Al alloy channels, Si precipitates, and AlN grains. Al‐Si transfer through the solid solution (Si3‐xAlxN4‐y) at the interface of Al alloy and β‐Si3N4 grains controls the kinetic of the interaction. When concentration of Al in solid solution exceeds a certain amount, it undergoes a topotactic phase transformation to form Al1‐xSixN1+y (viz., AlN). Next, the Al1‐xSixN1+y grains detach from the β‐Si3N4 grains and subsequently new Al‐Si3N4 interfaces are established. These interfaces repeat the interaction process, continuing until all the reactant is depleted. Thus, the interaction kinetics consist of a sequence of associated parabolic stages, precluding the observation of parabolic kinetics.

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“…The orientation relationship (OR) between AlN (P6 3 mc) and β‐Si 3 N 4 (P6 3 /m) also was investigated. It was found that the AlN crystallites forming adjacent to β‐Si 3 N 4 exhibit:

{0001}_{AlN} / / {0001}_{{Si}_{3} N_{4}}

…”

Section: Resultsmentioning

confidence: 99%

Ionic interdiffusion as interaction mechanism between Al and Si₃N₄

et al. 2019

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“…Glassy grain boundary phases, which are always present in liquid-phase-sintered ceramics, have proved to be responsible for property degradation at high temperatures. [1][2][3] An alternative method of processing silicon nitride, which has recently attracted great interest, is to consolidate inorganic polymer ceramic precursors into amorphous ceramics, where the consolidation happens simultaneously with the polymer-toceramic transformation at temperatures lower than 1000°C. 4 -7 Typically, one begins with a liquid polymer precursor that is then cross-linked to form an infusible network and pyrolyzed, with a controlled heating rate and at an appropriate environmental atmosphere, into an amorphous ceramic network.…”

Section: Introductionmentioning

confidence: 99%

InSitu Densification Behavior in the Pyrolysis Consolidation of Amorphous Si‐N‐C Bulk Ceramics from Polymer Precursors

Wan

Gasch

Mukherjee

2001

Journal of the American Ceramic Society

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In situ consolidation of amorphous Si-N-C ceramics during pyrolysis of polymer precursor provides a way to consolidate bulk silicon nitride based ceramics at lower temperatures. Porosity evolution during polymer-ceramic conversion has been investigated to clarify the densification process. A densification mechanism based on surface reaction and pyrolysis accommodated by viscous flow has been proposed.

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“…On the other hand, reflections of β‐Si 3 N 4 were observed after the heat treatment at 1750°C (Fig. 2(b), (c)) due to the α→β phase transformation of Si 3 N 4 at a high temperature 12 . The formation of SiC peaks was completely suppressed by the application of the protective powder bed (Fig.…”

Section: Resultsmentioning

confidence: 96%

Pre‐Treatment of Si₃N₄ Filler Particles for the Improvement of Si₃N_4filler/Si–C–N_matrix Particulate‐Reinforced Composites

Lee

2008

Journal of the American Ceramic Society

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The surface of Si3N4 filler particles was modified by heat treatments before the onset of the precursor impregnation and pyrolysis process. The strength, Young's modulus, and hardness of Si3N4filler/Si–C–Nmatrix particulate‐reinforced composites (PRC) were improved up to 50%, 60%, and 71%, respectively, by the treatment. Si was formed at the surface of the Si3N4 filler particles by the treatment, which induced a strong bonding between the filler and the Si–C–N matrix during pyrolysis by a carbothermal reaction, thus improving the properties of the PRC.

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Nitride Ceramics

Cited by 5 publications

References 119 publications

Ionic interdiffusion as interaction mechanism between Al and Si₃N₄

Ionic interdiffusion as interaction mechanism between Al and Si₃N₄

InSitu Densification Behavior in the Pyrolysis Consolidation of Amorphous Si‐N‐C Bulk Ceramics from Polymer Precursors

Pre‐Treatment of Si₃N₄ Filler Particles for the Improvement of Si₃N_4filler/Si–C–N_matrix Particulate‐Reinforced Composites

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Nitride Ceramics

Cited by 5 publications

References 119 publications

Ionic interdiffusion as interaction mechanism between Al and Si3N4

Ionic interdiffusion as interaction mechanism between Al and Si3N4

InSitu Densification Behavior in the Pyrolysis Consolidation of Amorphous Si‐N‐C Bulk Ceramics from Polymer Precursors

Pre‐Treatment of Si3N4 Filler Particles for the Improvement of Si3N4filler/Si–C–Nmatrix Particulate‐Reinforced Composites

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Product

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Ionic interdiffusion as interaction mechanism between Al and Si₃N₄

Ionic interdiffusion as interaction mechanism between Al and Si₃N₄

Pre‐Treatment of Si₃N₄ Filler Particles for the Improvement of Si₃N_4filler/Si–C–N_matrix Particulate‐Reinforced Composites