Microstructure and Creep Behavior of a Si3N4–SiC Micronanocomposite

Kašiarová, Monika; Shollock, Barbara A.; Boccaccını, Aldo R.; Dusza, Ján

doi:10.1111/j.1551-2916.2008.02848.x

Cited by 14 publications

(15 citation statements)

References 32 publications

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“…Kagiarova et al [19] stated that the low value of the stress exponent is consistent with samples with low cavity concentration. According to the morphology of the investigated samples, the porosity increases by increasing copper and germanium concentration; accordingly the exponent stress factor would be increased too.…”

Section: Creep Behaviormentioning

confidence: 73%

Indentation Creep Behavior and Microstructure of Cu-Ge Ferrites

Zaki¹,

Abdel‐Daiem²,

Swilem³

et al. 2011

MSA

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Cu-Ge ferrite was prepared using the standard ceramic method. The creep rate of polycrystalline Cu1+xGexFe2-2xO4 ferrite has been measured as a function of time at room temperature. It is found that the indentation length increases with the increase of both time and applied load. A regime of individual creep curves is observed for the first and second stages. It is not possible to record the third stage of the curve as usually happened in an ordinary creep test, because fracture of the samples does not occur. The slope is found to increase with increasing germanium and copper content in the steady state region. The high value of n (stress exponent factor) indicates that the dislocation creep is the dominate mechanism. The porosity arrangements developed within the specimens were examined using optical microscope. The results are discussed with regard to models describing the role of the steady state creep rate of metals. The morphology of the samples shows that the porosity is increased by increasing both copper and germanium ions

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Section: Creep Behaviormentioning

confidence: 73%

Indentation Creep Behavior and Microstructure of Cu-Ge Ferrites

Zaki¹,

Abdel‐Daiem²,

Swilem³

et al. 2011

MSA

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“…As the best structural ceramics, SiC and Si 3 N 4 have been developed for decades and continue to be extended further . Specifically the SiC/Si 3 N 4 composites are of increasing interest because they should complement each other in the mechanical properties. With the sintering requirement of SiC/Si 3 N 4 composites the study of the phase relations at high temperature in SiC–Si 3 N 4 ceramic systems should be concerned.…”

Section: Introductionmentioning

confidence: 99%

“…The self‐diffusion coefficient of Si and C, also Si and N, is too low to get the fully dense ceramics without sintering aids. Rare‐earth oxides are often used as sintering aids for densification of SiC ceramics and SiC/Si 3 N 4 composites . In the present work rare‐earth oxides R 2 O 3 (R = La,Gd,Y) were chosen as the members of systems and they stand for La, typical light rare earth; Gd, medium rare earth; and Y, the representative heavy one with the similar property of other heavy rare earths, all of which typically generate a complete series.…”

Section: Introductionmentioning

confidence: 99%

Phase Relations in Si–C–N–O–R (R = La,Gd,Y) Systems

Chen

et al. 2011

J. Am. Ceram. Soc.

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R = La,Gd,Y) systems by XRD phase analyses of the solid-state reacted samples from powder mixtures of SiC, Si 3 N 4 , and R 2 O 3 . Subsolidus phase diagrams of these systems were presented and summarized. Within these systems in-situ SiO 2 impurity in the powder mixtures often cause the formation of some oxygen-richer rare-earth siliconoxynitrides, J-, K-, H-phases and extends the ternary systems SiC-Si 3 N 4 -R 2 O 3 into the quaternary systems SiC-Si 3 N 4 -SiO 2 -R 2 O 3 (Si-C-N-O-R). In these systems, the reaction of partial SiC participation and the formation mechanism of rare-earth siliconoxynitrides are discussed.

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“…Many researches have shown that SiC grains have an inhibitory effect on the secondary recrystallization of Si 3 N 4 grains and the inhibition effect increases with the increase of the size [9,11]. Therefore, the β-Si 3 N 4 grains would not grow too large to reduce the strength of materials.…”

Section: Tem Analysismentioning

confidence: 99%

Effect of Different Sintering Additives on the Microstructure, Phase Compositions and Mechanical Properties of Si3N4/SiC Ceramics

Qin¹,

Yang

et al. 2020

Preprint

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Y2O3 and CeO2 were chosen as additives to investigate the effect of different additives on the microstructure, composition of phases and mechanical properties of Si3N4/SiC ceramics using pressureless sintering. Si3N4/SiC ceramic without additives had a high density, while after adding Y2O3 and CeO2, the density and flexural strength of Si3N4/SiC ceramics were significantly decreased due to the increase of porosity. The main phase compositions of samples were β-Si3N4 and SiC. Moreover, the liquid phases Y-Si-O-N and Ce-Si-O-N were observed after adding Y2O3 and CeO2 respectively. It also indicated that for Si3N4/SiC composite ceramics, the high aspect ratio β-Si3N4 overlapped with each other and closely bonded with glass phase could improve flexure strength effectively. Besides, the SiC crystal grains mainly existed in grain boundary, which could inhibit the secondary recrystallization to avoid that the decrease of flexural strength caused by the overgrowth of β-Si3N4 grains.

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Microstructure and Creep Behavior of a Si₃N₄–SiC Micronanocomposite

Cited by 14 publications

References 32 publications

Indentation Creep Behavior and Microstructure of Cu-Ge Ferrites

Indentation Creep Behavior and Microstructure of Cu-Ge Ferrites

Phase Relations in Si–C–N–O–R (R = La,Gd,Y) Systems

Effect of Different Sintering Additives on the Microstructure, Phase Compositions and Mechanical Properties of Si3N4/SiC Ceramics

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