Relations between composition and microstructure of sialons

Cao, GZ; Metselaar, R Ruud; Ziegler, G.

doi:10.1016/0955-2219(93)90042-p

Cited by 18 publications

(8 citation statements)

References 8 publications

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“…Several studies investigating ␣Ј content demonstrated the dependence of fracture toughness and hardness. 11,18,21,22 Sheu 23 reported that, if materials similar to the ones of this study were used, an optimum in the ␣Ј content was ∼30%. A high flexural strength was obtained with these materials at room temperature (1100 MPa) and at 1400°C in air (700 MPa).…”

Section: Resultsmentioning

confidence: 73%

“…This tendency also is in agreement with data from the literature. 20,21,23,36 (2) High-Temperature Properties (A) Oxidation Resistance: The oxidation resistance is one of the most important factors influencing the mechanical be-havior and limiting the lifetime of Si 3 N 4 ceramics in long-term applications at elevated temperatures. The results of the oxidation tests performed are summarized in Table V, expressed as weight gain after 100 h at 1400°C.…”

Section: Resultsmentioning

confidence: 99%

“…Mixed ␣Ј/␤Ј-SiAlON ceramics have been the subject of many studies. [10][11][12][13][14][15][16][17][18][19][20][21][22] The system Y-Al-Si-O-N has been investigated very intensively regarding chemical composition, densification, microstructure, and mechanical properties. However, there are few data available about their long-term, hightemperature properties.…”

Section: Introductionmentioning

confidence: 99%

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High‐Temperature Properties of Mixed α′/β′‐SiAlON Materials

Klemm

Herrmann

Reich

et al. 1998

Journal of the American Ceramic Society

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The mechanical behavior of mixed ␣/␤-SiAlON materials was studied at elevated temperatures. Two different ␣/␤-SiAlON compositions along the Si 3 N 4 -Y 2 O 3 ؒ9AlN composition line in the Si 3 N 4 -Al 2 O 3 ؒAlN-YNؒ3AlN plane (␣-SiAlON plane) were prepared using three different raw-material mixtures. Six different materials were obtained with significantly lower values in ␣-SiAlON than expected. The high-temperature properties of the materials studied were influenced strongly by the chemical composition (␣ content and grain-boundary phase) of the SiAlONs. A high content of ␣-SiAlON was beneficial in terms of creep behavior of the materials. The same materials, however, were characterized by a considerably degradated fracture behavior at elevated temperatures in air because of a crack-growth process enhanced by the poor oxidation resistance of these materials. It was concluded that, despite some superior features of the materials studied, a long-term application of mixed ␣/␤-SiAlON materials at 1400°C in air is problematical. A combination of all properties required for such applications was not observed. For that reason, it is suggested that the real high-temperature potential of these materials in air should be limited to temperatures <1300°C.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High‐Temperature Properties of Mixed α′/β′‐SiAlON Materials

Klemm

Herrmann

Reich

et al. 1998

Journal of the American Ceramic Society

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“…SiAlON is a solid solution formed by replacing Si 4+ and N 3− by Al 3+ and O 2− in Si 3 N 4 lattice without changing the structure 1–6 . As an important engineering material, SiAlON ceramics have been widely investigated due to its excellent mechanical properties and high‐temperature durability.…”

Section: Introductionmentioning

confidence: 99%

Influence of stabilizing ions and sintering process on the thermal conductivity of α‐SiAlON ceramics

Zhang

et al. 2022

J Am Ceram Soc.

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α‐SiAlON ceramics with different stabilizing ions of Yb, Dy, Nd, Y, Ca, and binary stabilizing ions of (Yb + Ca) and (Yb + Nd) were prepared by spark plasma sintering at 1600°C and gas pressure sintering at 1800 and 1900°C, and their thermal conductivity was investigated. It was found that α‐SiAlON ceramics with larger and heavier stabilizing ions had lower thermal conductivity and the thermal conductivity could be further reduced by using binary stabilizing ions, which can be explained by phonon scattering from point defects. At the same time, the samples prepared at lower sintering temperatures showed smaller grain sizes and lower thermal conductivity. The relationship between the thermal diffusivity of samples and temperature was studied, where the dependence of inverse thermal diffusivity on temperature was better fitted by a quadratic fitting function than the usual linear one over a wide temperature range from 25 to 800°C.

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“…A majority of the studies so far have concentrated on compositions on or near the stoichiometric union Si 3 N 4 -M 2 O 3 ⅐9AlN in the said plane, which produces a two-phase material of ␣Јand ␤Ј-phases. 6,7 However, the other zones in the above-mentioned compositional plane which offer the formation of SiAlON polytypes in combination with ␣Ј-, ␤Ј-, or ␣Ј-/␤Ј-phase materials are relatively neglected. In one of our earlier publications, 8 we presented the phase relationships along the said plane in the Y-Si-Al-O-N system.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Two‐Phase SiAlONs in the Yttrium–Silicon–Aluminum–Oxygen–Nitrogen System

Bandyopadhyay

Maiti

2002

Journal of the American Ceramic Society

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The reaction sequences of formation of different SiAlON phases along the Si 3 N 4 -Y 2 O 3 ⅐9AlN-AlN⅐Al 2 O 3 concentration plane in the Y-Si-Al-O-N system have been studied through dilatometric investigations. The presence and stability of some crystalline phases greatly influence the nature of the liquid, which ultimately governs the sintering process. Detailed knowledge of the sintering of different phases is useful to highlight a useful compositional zone where good densification of the multiphase SiAlON ceramics may be achieved.

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Relations between composition and microstructure of sialons

Abstract: The relationship between composition and microstructure of sialon ceramics was studied. Fully dense yttrium-containing ~'-and o~ '+ t~'-

Cited by 18 publications

References 8 publications

High‐Temperature Properties of Mixed α′/β′‐SiAlON Materials

High‐Temperature Properties of Mixed α′/β′‐SiAlON Materials

Influence of stabilizing ions and sintering process on the thermal conductivity of α‐SiAlON ceramics

Synthesis of Two‐Phase SiAlONs in the Yttrium–Silicon–Aluminum–Oxygen–Nitrogen System

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