Microstructure and fracture toughness of a spark plasma sintered Al2O3-based composite with BaTiO3 particulates

Rattanachan, Sirirat; Miyashita, Yukio; Mutoh, Yoshiharu

doi:10.1016/s0955-2219(02)00294-7

Cited by 28 publications

(13 citation statements)

References 21 publications

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“…3 [9,10]. The influence of GS on the hardness H at d > dc (critical grain size) is here considered to represent the motion of dislocations and is given by the Hall-Petch equation: Fig.…”

Section: Methodsmentioning

confidence: 99%

Grain-size effects on the hardness of nanograin BaTiO3 ceramics

et al. 2007

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Dense nanocrystalline BaTiO 3 (BT) ceramics with grain size (GS) 50 nm were successfully prepared by spark plasma sintering (SPS) method. The nanoindentation experiment was used to test the hardness of different GS BT ceramics. It was found that the hardness of 50 nm nanograin BT ceramics increased 82% than that of 1.2 μm BT ceramics fabricated by conventional sintering (CS) process. Dislocation pinning resulting from the increase of grain boundary by ultrafine GS are believed to be the dominant factor in raising strength. Restriction on dislocation generation and mobility due to the domain wall motion and sliding imposed by ultrafine GS are expected to be exceptionally important. At the same time, the large stress in nanograin BT ceramics may also play a role in producing high strength. These differences of the hardness behavior between BT ceramics are attributed to the variation of the resultant microstructure, especially the GS of the ceramics.

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“…3 [9,10]. The influence of GS on the hardness H at d > dc (critical grain size) is here considered to represent the motion of dislocations and is given by the Hall-Petch equation: Fig.…”

Section: Methodsmentioning

confidence: 99%

Grain-size effects on the hardness of nanograin BaTiO3 ceramics

et al. 2007

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“…The difference in elastic constant thus plays an important role on the interactions between crack and inclusions. The crack tends to propagate into the phase with lower elastic modulus [18] and the crack is thus attracted to the Ti 3 SiC 2 inclusions, as demonstrated in Fig. 8.…”

Section: Toughening Mechanismmentioning

confidence: 96%

Toughening alumina with layered Ti3SiC2 inclusions

Chin

Tuan

Huang

et al. 2010

Journal of Alloys and Compounds

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“…A number of reports address the bonding at the interface between α-Al 2 O 3 and aluminum [10][11][12] . In addition, interfacial bonding 22,23) . These imply that the lattice matching of α-Al 2 O 3 with BaTiO 3 or the certain other phases is higher than that of γ-Al 2 O 3 .…”

Section: Delaminated Surfacementioning

confidence: 99%

Effect of Joining Conditions on the Shear Strength of Barium Titanate Joint Brazed with Molten Aluminum

2017

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The shear tests using barium titanate joint brazed with molten aluminum under several joining conditions were conducted to determine the optimum joining condition. The barium titanate joints brazed at 780 C had estimative strength, while those brazed at 720 C did not. The strengths of the joints brazed at 780 C became higher with increase in the heat holding time. Especially, the heat holding time for more than 24 h gave higher joint strength than the original shear strength of barium titanate. To discuss the bonding mechanism, the fractured surfaces of the joints were observed and the cross-sectional element distributions in the vicinity of the joint interface were investigated. The observations demonstrated that pieces and grains of the fractured barium titanate were strongly bonded to the aluminum layer at longer holding times. Meanwhile, from the oxygen distributions, relatively thick alumina layers that formed between barium titanate and aluminum at longer holding times were observed. These facts suggest that interfacial bonding is achieved through the formation of an alumina interlayer due to progressive oxidation of molten aluminum during joining process.

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Microstructure and fracture toughness of a spark plasma sintered Al2O3-based composite with BaTiO3 particulates

Cited by 28 publications

References 21 publications

Grain-size effects on the hardness of nanograin BaTiO3 ceramics

Grain-size effects on the hardness of nanograin BaTiO3 ceramics

Toughening alumina with layered Ti3SiC2 inclusions

Effect of Joining Conditions on the Shear Strength of Barium Titanate Joint Brazed with Molten Aluminum

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