Fabrication and properties of Al-infiltrated RBAO-based composites

Wu, Si; Gesing, Adam J.; Travitzky, Nahum; Claussen, Nils

doi:10.1016/0955-2219(91)90105-9

Cited by 46 publications

(72 citation statements)

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“…A liquid metal infiltration technique, first proposed by Wu et al 8 and Aghajanian et al, 9 was employed for preparing a biomimetic hydroxyapatite/silver composite, starting from a porous hydroxyapatite body. This processing technique enabled us to obtain a biomimetic ceramic/metal microstructure consisting of interpenetrating networks regardless of the differences in melting points or the poor wettability between the liquid silver metal and the hydroxyapatite phase.…”

Section: Materials Preparationmentioning

confidence: 99%

Study of the toughening mechanisms in bone and biomimetic hydroxyapatite materials using Raman microprobe spectroscopy

Pezzotti

Sakakura

2003

J Biomedical Materials Res

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A Raman microprobe spectroscopy characterization of microscopic fracture mechanisms is presented for a natural hydroxyapatite material (cortical bovine femur) and two synthetic hydroxyapatite-based materials with biomimetic structures-a hydroxyapatite skeleton interpenetrated with a metallic (silver) or a polymeric (nylon-6) phase. In both the natural and synthetic materials, a conspicuous amount of toughening arose from a microscopic crack-bridging mechanism operated by elasto-plastic stretching of unbroken second-phase ligaments along the crack wake. This mechanism led to a rising R-curve behavior. An additional micromechanism, responsible for stress relaxation at the crack tip, was recognized in the natural bone material and was partly mimicked in the hydroxyapatite/silver composite. This crack-tip mechanism conspicuously enhanced the cortical bone material resistance to fracture initiation. A piezo-spectroscopic technique, based on a microprobe measurement of 980 cm(-1) Raman line of hydroxyapatite, enabled us to quantitatively assess in situ the microscopic stress fields developed during fracture both at the crack tip and along the crack wake. Using the Raman piezo-spectroscopy technique, toughening mechanisms were assessed quantitatively and rationally related to the macroscopic fracture characteristics of hydroxyapatite-based materials.

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Section: Materials Preparationmentioning

confidence: 99%

Study of the toughening mechanisms in bone and biomimetic hydroxyapatite materials using Raman microprobe spectroscopy

Pezzotti

Sakakura

2003

J Biomedical Materials Res

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“…A small hysteresis is observed at temperatures above 900°C. Although the thermal strain increases with the content of Ni 3 Al, we saw very little dependence of hysteresis on composition.…”

Section: (6) Thermal Expansion Propertiesmentioning

confidence: 70%

“…The phases appear to be homogeneously distributed. The ligament diameter as measured by scanning electron microscopy ranged from about 3 to 5 m and was independent of the amount of Ni 3 Al in the composite. The grain size of alumina ranged from 5 to 10 m and was consistent with the manufacturer's description of the starting powder.…”

Section: Resultsmentioning

confidence: 99%

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Processing and Mechanical Properties of Al₂O₃/Ni₃Al Composites with Interpenetrating Network Microstructure

Skirl

Krause

Wiederhorn

et al. 2001

Journal of the American Ceramic Society

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Composites with microstructures of interpenetrating networks were manufactured by gas pressure infiltration of Ni 3 Al into porous preforms of aluminum oxide. Composites with Ni 3 Al contents of between 15% and 30% by volume were made and evaluated mechanically at temperatures between room temperature and 1000°C. The fracture strength, the fracture toughness, Young's modulus, and the thermal expansion coefficient were measured for each composite and test condition and were correlated with the microstructures of the composites. Composites with low Ni 3 Al contents had strengths below 400 MPa, presumably due to microcracking along the interface between the Ni 3 Al and the Al 2 O 3 . The composite with the highest content of Ni 3 Al, 30 vol%, had a mean fracture strength of 675 ؎ 16 MPa, a Weibull modulus of 23.9, and a room-temperature toughness of 9.2 ؎ 0.5 MPa⅐m 1/2 .

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“…By directed metal oxidation method, Al/Al 2 O 3 exhibiting a fracture toughness of 9.5 MPa m 1/2 is reported [7]. By gas pressure metal infiltration method, Al/Al 2 O 3 exhibiting a bending strength of 760 MPa and a fracture toughness of 5.8 MPa m 1/2 are reported [8]. In general, the improvement of fracture toughness is ascribed to the unoxidized ductile phases and always at the expense of high porosity.…”

Section: Introductionmentioning

confidence: 95%

Preparation and properties of high toughness RBAO macroporous membrane support

Fan

Zheng

et al. 2010

Ceramics International

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Fabrication and properties of Al-infiltrated RBAO-based composites

Cited by 46 publications

References 4 publications

Study of the toughening mechanisms in bone and biomimetic hydroxyapatite materials using Raman microprobe spectroscopy

Study of the toughening mechanisms in bone and biomimetic hydroxyapatite materials using Raman microprobe spectroscopy

Processing and Mechanical Properties of Al₂O₃/Ni₃Al Composites with Interpenetrating Network Microstructure

Preparation and properties of high toughness RBAO macroporous membrane support

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Fabrication and properties of Al-infiltrated RBAO-based composites

Cited by 46 publications

References 4 publications

Study of the toughening mechanisms in bone and biomimetic hydroxyapatite materials using Raman microprobe spectroscopy

Study of the toughening mechanisms in bone and biomimetic hydroxyapatite materials using Raman microprobe spectroscopy

Processing and Mechanical Properties of Al2O3/Ni3Al Composites with Interpenetrating Network Microstructure

Preparation and properties of high toughness RBAO macroporous membrane support

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Processing and Mechanical Properties of Al₂O₃/Ni₃Al Composites with Interpenetrating Network Microstructure