A new approach for toughening of ceramics

Chen, X.M.; Yang, Bingquan

doi:10.1016/s0167-577x(97)00107-9

Cited by 59 publications

(31 citation statements)

References 7 publications

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“…(2) When a crack expands to a LiNbO 3 grain, the piezoelectric LiNbO 3 will transform part of the fracture energy into electrical energy, and domain movement may be induced in the LiNbO 3 grain to further dissipate the fracture energy. Such a process is called ''piezoelectric energy dissipation toughening mechanism'' [3][4][5][6][7][8][9][10][11]. (3) LiNbO 3 partially reacts with HAp to form CaNb 2 O 6 , which belongs to central symmetric point groups, and possesses no piezoelectric effect.…”

Section: Density and Mechanical Propertiesmentioning

confidence: 99%

“…Based on the piezoelectric effect and domain wall motion, Chen et al [3] proposed a new toughening method, in which a piezoelectric and/or ferroelectric secondary phase is incorporated into a ceramic matrix as the toughening agent. When a crack propagates in the composite, a part of fracture energy, will be transformed into electrical energy or dissipated by a stress-induced domain movement, leading to an enhanced fracture resistance [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…When a crack propagates in the composite, a part of fracture energy, will be transformed into electrical energy or dissipated by a stress-induced domain movement, leading to an enhanced fracture resistance [3,4]. This approach has been successfully applied in various composite systems: Nd 2 Ti 2 O 7 /Al 2 O 3 [4], BaTiO 3 /3Y-TZP [5], Sr 2 Nb 2 O 7 /3Y-TZP [6], Nd 2 Ti 2 O 7 /8Y-FSZ [7], LiTaO 3 / Al 2 O 3 [8], BaTiO 3 /MgO [9], BaTiO 3 /La 2 Zr 2 O 7 [10], and PZT/glass [11].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Piezoelectric Materials Toughening Multi-walled Carbon Nanotubes/Hydroxyapatite Biocomposites

Zhao

Sun

Ouyang

et al. 2011

J Inorg Organomet Polym

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Multi-walled carbon nanotubes (MWCNTs)/ hydroxyapatite (HAp) biocomposites reinforced by lead zirconate titanate (PZT) or lithium niobate (LiNbO 3 ) were prepared at 950°C by hot pressing. The mechanical test results show that the MWCNTs/LiNbO 3 /HAp (CLH) composite has excellent flexural strength and fracture toughness, about 44 and 110% increase as compared with those of the MWCNTs/HAp (CH) composite. However, dense MWCNTs/PZT/HAp (CPH) composite could not be prepared due to serious evaporation of Pb. Based on indepth observation of microstructure by field-emission scanning electron microscopy, the toughening mechanism in the CLH composite was discussed.

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Section: Density and Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Piezoelectric Materials Toughening Multi-walled Carbon Nanotubes/Hydroxyapatite Biocomposites

Zhao

Sun

Ouyang

et al. 2011

J Inorg Organomet Polym

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“…The piezoelectric secondary phase toughening approach has been applied successfully to several systems: BaTiO 3 /Al 2 O 3 , Nd 2 Ti 2 O 7 /Al 2 O 3 [74]. Nd 2 Ti 2 O 7 as a secondary phase was able to coexist with an 8YSZ matrix, and the fracture toughness K Ic was scientifically improved by a Nd 2 Ti 2 O 7 addition.…”

Section: Zirconia -Baesed Electrolytesmentioning

confidence: 99%

Composite Oxide Electrolytes for Electrochemical Devices

Dudek¹

2008

Advances in Materials Sciences

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This work is focused on the comparative analysis of electrical, electrochemical and mechanical properties of composite ceramic oxide electrolytes, providing a brief overview of the materials having better performance than monophase ones in various high temperature electrochemical devices such as: solid oxide fuel cells, sensors for automotive industry, oxygen probes for controlling metal processing. Introduction of Al 2 O 3 inclusions into cubic yttria -zirconia solid solution (8YSZ) matrix, caused the improvement of electrical and mechanical properties compared to pure 8YSZ. The Nd 2 Ti 2 O 7 secondary phase was also able to coexist with 8YSZ matrix and the fracture toughness K Ic of 8YSZ ceramics was also significantly improved by Nd 2 Ti 2 O 7 addition.Heterophase oxide ionic conductors in the system Calcium zirconate -cubic calcia zirconia solid electrolytes seem to be promising solid electrolytes for application in electrochemical probes for controlling oxygen dissolved in molten steel. The ionic conduction limit for electrolytes based on CaZrO 3 is lower than that for calcia -stabilized zirconia (13CSZ). Hence CaZrO 3 -based materials perform better at low oxygen concentration at molten alloys.On the other hand composite layered ceramics involving Ce 0.8 Sm 0.2 O 2 /Bi 0.8 Eb 0.2 O 2 or Ce 0.9 Gd 0.1 O 2 /BaCe 0.8 Y 0.2 O 3 /Ce 0.9 Gd 0.1 O 1.95 system exhibited better electrolytic stability in gas atmospheres with low oxygen partial pressure at the temperatures 600-800 o C. These materials are successfully tested as electrolytes in solid oxide fuel cells. The gradient ceramic oxide electrolytes seems to overcome the limitation of applying them as solid electrolytes in solid oxide fuel cells for long time performance.

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“…In recent years, new ceramic matrix composites with piezoelectric secondary phase have been developed [3][4][5]. High fracture toughness of BaTiO 3 -Al 2 O 3 composite sintered by a spark plasma sintering method has been obtained, compared to the monolithic Al 2 O 3 [6].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of piezoelectric laminate for smart material and crack sensing capability

Rattanachan

Miyashita

Mutoh

2005

Science and Technology of Advanced Materials

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Piezoelectric laminate composite has been successfully fabricated as a smart material by a spark plasma sintering process. Fully or nearly fully dense BaTiO 3 /MgO (pre-sintered)/BaTiO 3 , BaTiO 3 /MgO with 10 vol% BaTiO 3 /BaTiO 3 laminates were sintered at 1300 8C with a holding time of 5 min under a pressure of 35 MPa. From EDS analysis, no reaction between BaTiO 3 and MgO layers was observed along the interface. Effects of cycle stress and stress intensity factor on the voltage response of the proposed laminates were investigated for confirmation of a crack detecting capability. The resultant relationship between crack length and voltage response range clearly showed that the proposed laminates have a crack sensing capacity. q

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A new approach for toughening of ceramics

Cited by 59 publications

References 7 publications

Microstructure and Mechanical Properties of Piezoelectric Materials Toughening Multi-walled Carbon Nanotubes/Hydroxyapatite Biocomposites

Microstructure and Mechanical Properties of Piezoelectric Materials Toughening Multi-walled Carbon Nanotubes/Hydroxyapatite Biocomposites

Composite Oxide Electrolytes for Electrochemical Devices

Fabrication of piezoelectric laminate for smart material and crack sensing capability

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