The Effect of Grain Size on the Toughness of Sintered Si3N4

Matsuhiro, Keiji; Takahashi, T.

doi:10.1002/9780470310557.ch31

Cited by 34 publications

(4 citation statements)

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“…The volume fraction of grains with a diameter of 0.5-1 m is virtually invariable among all sample types, whereas that of grains with a diameter of Ͻ0.5 m decreases and the content of large grains increases with additions of ESP powder. In keeping with many findings, 9,14,21,22,24 the K IC values approximately correspond to the large grain content (Ͼ1 m).…”

Section: (3) Mechanical Characterizationsupporting

confidence: 87%

Relationship between Microstructure and Mechanical Performance of a 70% Silicon Nitride–30% Barium Aluminum Silicate Self‐Reinforced Ceramic Composite

White

2001

Journal of the American Ceramic Society

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The abnormal grain growth of ␤-Si 3 N 4 was observed in a 70% Si 3 N 4 -30% barium aluminum silicate (70%-Si 3 N 4 -30%-BAS) self-reinforced composite that was pressureless-sintered at 1930°C; Si 3 N 4 starting powders with a wide particle-size distribution were used. The addition of coarse Si 3 N 4 powder encouraged the abnormal growth of ␤-Si 3 N 4 grains, which allowed microstructural modification through control of the content and size distribution of ␤-Si 3 N 4 nuclei. The mechanical response of different microstructures was characterized in terms of flexural strength, as well as indentation fracture resistance, at room temperature. The presence of even a small amount of abnormally grown ␤-Si 3 N 4 grains improved the fracture toughness and minimized the variability in flexural strength.

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Section: (3) Mechanical Characterizationsupporting

confidence: 87%

Relationship between Microstructure and Mechanical Performance of a 70% Silicon Nitride–30% Barium Aluminum Silicate Self‐Reinforced Ceramic Composite

White

2001

Journal of the American Ceramic Society

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“…From the microstructural point of view, these results are in agreement with the literature for this type of material, since there is a welldefined relationship between microstructure and fracture toughness as a function of how it interacts with cracks through the mechanisms of deflection, separation of grains and branching of cracks and where there are two key parameters in the microstructure that give indications of how they act as it is size and shape relationship of the β-Si 3 N 4 phase. The effect of grain size on the toughness has already been studied by others (Matsuhiro &Takahashi, 2008), who reported that the polycrystalline Si 3 N 4 with the same relation of form, the samples that had a bigger grain size presented a greater Figure 7. Variation of the hardness with respect to the applied load in the indentation: a) sample Si 3 N 4 -A with and without post-heat treatment; b) sample Si 3 N 4 -B with and without post-heat treatment Carrasquero-rodríguez e.J., MinChala-Marquino J.M., roMero-roMero B.r., lópez-lópez l.M., FaJardo-seMinario J.i.…”

Section: Fracture Toughness (Kc)mentioning

confidence: 72%

Determination of fracture toughness and elastic module in materials based silicon nitride

Rodriguez

Minchala-Marquino

Romero

et al. 2019

iit

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The knowledge of the mechanical properties of any material subjected to loads is necessary for its use in structural applications. Silicon nitride (Si3N4) ceramics are well-known materials used in engineering applications due to their outstanding combination of high strength and fracture toughness. The most studied mechanical properties of Si3N4 are hardness, fracture toughness and mechanical resistance. Recent advances in the production processes that incorporate high purity rare earth elements as sintering additives have improved these mechanical properties. Using Vickers indentation method, the elastic module and fracture toughness of Si3N4 based materials modified with La2O3, Y2O3 and Al2O3 were determined as a function of the cracking system type that prevails under the effect of load. The results indicate that adding rare earth to the matrix increased the fracture toughness the Si3N4 base ceramic Samples containing La2O3+Y2O3 showed higher values of fracture toughness than the ones with Al2O3+La2O3, regardless of the equation used in the calculations. Meanwhile the elastic module decrease approximately 100 GPa for both types of nitrides by the effect of the temperature.

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“…In the 1970s, Lange found that pillar-like b-Si 3 N 4 formed during sintering could improve its fracture toughness [1,2]. Late in the 1980s, the processing of in situ toughened Si 3 N 4 was put forward definitely [3][4][5]. In situ toughened Si 3 N 4 has become the hotspot of scientific research because of its excellent performance and low cost.…”

Section: Introductionmentioning

confidence: 98%

Designing expert system for in situ toughened Si3N4 based on adaptive neural fuzzy inference system and genetic algorithms

Zeng

Zhang

et al. 2009

Materials & Design

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The Effect of Grain Size on the Toughness of Sintered Si3N4

Cited by 34 publications

References 0 publications

Relationship between Microstructure and Mechanical Performance of a 70% Silicon Nitride–30% Barium Aluminum Silicate Self‐Reinforced Ceramic Composite

Relationship between Microstructure and Mechanical Performance of a 70% Silicon Nitride–30% Barium Aluminum Silicate Self‐Reinforced Ceramic Composite

Determination of fracture toughness and elastic module in materials based silicon nitride

Designing expert system for in situ toughened Si3N4 based on adaptive neural fuzzy inference system and genetic algorithms

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