Characterization of (Nd,Y)-TZP ceramics prepared by a colloidal suspension coating technique

Zhang, Fei; Xu, Tao; Huang, Shuigen; Kan, Yanmei; Wang, Pei-Ling; Lü, Lin; Biest, Omer Van der

doi:10.1016/j.jeurceramsoc.2006.05.056

Cited by 16 publications

(19 citation statements)

References 13 publications

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“…The explanation of this interesting observation could be as follows: Compared to the co-precipitation method, the impregnation method leads to a selective enrichment of the ZrO 2 surface by Nd 3+ . The disordered structure or transition structure of Nd/ZrO 2 and oxygen vacancies, and/or defect centers in the surface have been reported to stabilize the tetragonal phase of ZrO 2 [8,11]. These vacancies and/or defect centers can easily form on the surface of ZrO 2 because there is a significant difference in the ionic radius between Nd 3+ (1.109 A) and Zr 4+ (0.89 A) [18].…”

Section: Resultsmentioning

confidence: 99%

“…The metastable tetragonal phase changes into the monoclinic phase with increasing temperature, and this transformation prevents applications of tetragonal ZrO 2 over a broad temperature range [5]. Many researchers have studied the mechanism of the phase transition of ZrO 2 [4,6] and the method for stabilization of the tetragonal phase, usually by alloying ZrO 2 with some oxides, such as CaO, MgO, and SiO 2 [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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UV Raman spectroscopic study on the surface phase of ZrO2 modified with Nd2O3

et al. 2011

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

UV Raman spectroscopic study on the surface phase of ZrO2 modified with Nd2O3

et al. 2011

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“…Hardness values are very similar to data presented by Vleugels for pressurelessly sintered NdY-TZP of the same composition. [7] Figure 2 shows the bending strength of TZP and ATZ materials. All materials show a flat maximum of bending strength at 2-4 h dwell at 1450 8C.…”

Section: Resultsmentioning

confidence: 99%

“…At longer dwell times the critical grain size is exceeded. Vleugels et al have shown a sharp decline in toughness of NdY-TZP at longer dwell >5 h. [7] Microstruc-R. Gadow and F. Kern/Novel Zirconia--Alumina Nanocomposites . .…”

Section: Resultsmentioning

confidence: 99%

Novel Zirconia–Alumina Nanocomposites Combining High Strength and Toughness

Gadow

Kern

2010

Adv Eng Mater

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Alumina toughened zirconia (ATZ) composites, combining a matrix of tetragonal zirconia polycrystals (TZP) and an alumina dispersion, are known for their high strength, toughness, and abrasion resistance. Depending on the type of stabilizing oxide in TZP the materials can be tailored to be either extremely strong (Y–TZP) or extremely tough (Ce–TZP) with a considerable cutback in the complementary property. Novel nanocomposite ATZ materials consisting of TZP co‐stabilized by neodymium and yttrium oxide (Nd–Y–TZP) combined with a reinforcement of 0–40 vol% alumina were produced to achieve high bending strength of 1200–1500 MPa at a toughness of 8–12 MPa·√m. TZP was produced by coating monoclinic nanopowder with 1.5 mol% yttria and 1.5 mol% neodymia. The powder was then blended with submicron size alumina and consolidated by hot pressing. Mechanical and microstructural properties were investigated.

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“…The former favors high strength and moderate toughness while the latter acts vice versa [8]. It has been shown in several publications that by a combination of small and large trivalent dopants such as yttria and neodymia or ytterbia and neodymia, TZP materials combining high strength and toughness can be produced [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Mechanical Properties in ED-Machinable Zirconia-Tungsten Carbide Composites with Yttria-Neodymia Co-Stabilized Zirconia Matrix

2018

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The electrical discharge machining-process (EDM) is a smart solution to optimize the manufacturing chain of customized and complex shaped ceramic components. To comply with the high requirements for the machine and mold design, it is necessary to improve the mechanical properties of ED-machinable ceramics. In this study, ceramic composites with a tetragonal zirconia matrix and tungsten carbide as electrically conductive dispersion were investigated. To improve the toughness of this high strength material, co-stabilized zirconia coated with yttria and neodymia as dopants were used in the compositions with 1.5/1.5 and 1.75/1.25 mol %. These recipes were compared to commercial 3Y-TZP as a reference matrix material combined with the same WC raw powder. The electrically conductive phase content was varied from 20 to 28 vol %. For all compositions, the ceramic blanks were hot pressed at identical dwell and pressure, but with various sintering temperatures (1300 °C to 1450 °C) and then tested with respect to the mechanical and electrical properties. By variation of the stabilizer system, a significantly higher toughness of up to 11.3 MPa√m compared to 5.3 MPa√m for 3Y-TZP-20WC is achieved while the bending strength stays at a comparable high level of >1500 MPa.

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Characterization of (Nd,Y)-TZP ceramics prepared by a colloidal suspension coating technique

Cited by 16 publications

References 13 publications

UV Raman spectroscopic study on the surface phase of ZrO2 modified with Nd2O3

UV Raman spectroscopic study on the surface phase of ZrO2 modified with Nd2O3

Novel Zirconia–Alumina Nanocomposites Combining High Strength and Toughness

Enhanced Mechanical Properties in ED-Machinable Zirconia-Tungsten Carbide Composites with Yttria-Neodymia Co-Stabilized Zirconia Matrix

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