Effect of zirconia (3 mol% yttria) additive on mechanical properties and structure of alumina ceramics

Grigoryev, O. N.; Фирстов, С. А.; Babiy, O. A.; Orlovskaya, Nina; Homenko, G. E.

doi:10.1007/bf00376289

Cited by 16 publications

(6 citation statements)

References 7 publications

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“…Because of its high strength and fracture toughness, partially stabilized zirconia has been commonly used as a reinforcement for many ceramics,26, 27 including the bioactive HA 19, 20. However, a deleterious reaction between HA and ZrO 2 to form tricalcium phosphate [TCP, Ca 3 (PO 4 ) 2 ] and fully stabilized ZrO 2 occurs according to the following formula.…”

Section: Methodsmentioning

confidence: 99%

Combined hepatocellular and cholangiocarcinoma

Jarnagin

Weber

Tickoo

et al. 2002

Cancer

308

107

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The aim of this study was to clarify whether autoimmunity against P/Q‐type voltage‐gated calcium channels (VGCCs) in the cerebellum was associated with the pathogenesis of paraneoplastic cerebellar degeneration (PCD) with Lambert‐Eaton myasthenic syndrome (LEMS). We used human autopsy cerebellar tissues from three PCD‐LEMS patients and six other disease patients including one with LEMS as the controls. We compared cerebellar P/Q‐type VGCC in these patients and controls for the amount and ratio of autoantibody‐channel complex using an 125I‐ω‐conotoxin MVIIC‐binding assay with Scatchard analysis, and their distribution using autoradiography. The quantity of cerebellar P/Q‐type VGCC measured by Scatchard analysis were reduced in PCD‐LEMS patients (63.0 ± 7.0fmol/mg, n = 3), compared with the controls (297.8 ± 38.9fmol/mg, n = 6). The ratio of autoantibody‐VGCC complexes to total P/Q‐type VGCCs measured by immunoprecipitation assay were increased in PCD‐LEMS patients. We analysed cerebellar specimens by autoradiography using 125I‐ω‐conotoxin MVIIC, which specifically binds to P/Q‐type VGCCs. In PCD‐LEMS cerebellum, the toxin binding sites of P/Q‐type VGCCs were markedly reduced compared with controls, especially in the molecular layer, which is the richest area of P/Q‐type VGCCs in the normal cerebellum. This suggests that P/Q‐type VGCCs of the cerebellar molecular layer is the immunological target in developing PCD‐LEMS.

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Section: Methodsmentioning

confidence: 99%

Combined hepatocellular and cholangiocarcinoma

Jarnagin

Weber

Tickoo

et al. 2002

Cancer

308

107

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“…It has been postulated that a homogeneous dopant distribution in the microstructure of TZP ceramics is vital for preventing the t ‐to‐ m Martensitic phase transformation, 11 which would deny the transformation toughening mechanism, although there were reports that an inhomogeneous stabilizer distribution, such as the “core–shell” structure, 15,16 could enhance the transformability to result in better fracture toughness. However, TZP ceramics made through coated powder did not exhibit such core–shell grains 17 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Powder Coating on Stabilizer Distribution in CeO₂‐Stabilized ZrO₂ Ceramics

Fang

Wang

et al. 2005

Journal of the American Ceramic Society

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The phase and microstructure relationship of 12 mol% CeO 2stabilized ZrO 2 ceramics prepared from coated powder was investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersed Xray spectroscopy (EDS). As compared with the sample prepared with co-precipitated method, which exhibited a similar grain size distribution, the EDS analysis revealed that the powder coating induced a wide distribution of CeO 2 solubility, which decreases monotonically with the increase of grain size. This variation of stabilizer content from grain to grain rendered many large grains in the monoclinic phase. Stronger cerium segregation to grain boundaries was observed between large grains, which often form thin amorphous films there. The inhomogeneous CeO 2 distribution keeps more tetragonal ZrO 2 grains close to the phase boundary to facilitate the transforming toughness. Addition of an Al 2 O 3 precursor in coated powders effectively raises the overall CeO 2 stabilizer content in the grains and preserves more transformable tetragonal phase in the microstructure, which further enhanced the fracture toughness. The dependence of CeO 2 solubility on grain size may be explained in a simple coating-controlled diffusion and growth process that deserves further investigation. 1929J ournal

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“…Partially stabilized zirconia has been commonly used as a reinforcement for many ceramics because of its high strength and fracture toughness. [8][9][10][11][12][13] Bioinertness is another merit of the ZrO 2 . 14 However, extensive reaction between the HAp and the ZrO 2 to form TCP and fully stabilized ZrO 2 is a big disadvantage of this approach.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of Hydroxyapatite Bioceramic by Addition of ZrO2 Coated with Al2O3

Kong

Kim

et al. 1999

Journal of the American Ceramic Society

127

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The mechanical properties of hydroxyapatite (HAp) bioceramic material were improved significantly by adding tetragonal-zirconia-polycrystalline (TZP) powder coated with Al 2 O 3 . The coating was done by dispersing the TZP powder in a boehmite suspension and adjusting the pH to cause heterocoagulation. The coating effectively reduced the deleterious reaction between the HAp and the TZP that tended to form tricalcium phosphate (TCP) and fully stabilized cubic zirconia. When 15 vol% zirconia and 30 vol% alumina were added to the HAp by the coating method, the strength and the fracture toughness of the composite were 300 MPa and 3 MPa⅐m 1/2 , respectively, which are about 3 times higher than those of pure HAp.

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Effect of zirconia (3 mol% yttria) additive on mechanical properties and structure of alumina ceramics

Cited by 16 publications

References 7 publications

Combined hepatocellular and cholangiocarcinoma

Combined hepatocellular and cholangiocarcinoma

Effect of Powder Coating on Stabilizer Distribution in CeO₂‐Stabilized ZrO₂ Ceramics

Reinforcement of Hydroxyapatite Bioceramic by Addition of ZrO2 Coated with Al2O3

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Effect of zirconia (3 mol% yttria) additive on mechanical properties and structure of alumina ceramics

Cited by 16 publications

References 7 publications

Combined hepatocellular and cholangiocarcinoma

Combined hepatocellular and cholangiocarcinoma

Effect of Powder Coating on Stabilizer Distribution in CeO2‐Stabilized ZrO2 Ceramics

Reinforcement of Hydroxyapatite Bioceramic by Addition of ZrO2 Coated with Al2O3

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Effect of Powder Coating on Stabilizer Distribution in CeO₂‐Stabilized ZrO₂ Ceramics