Densification and mechanical properties of fine-grained Al2O3–ZrO2 composites consolidated by spark plasma sintering

Meng, Fancheng; Liu, Cheng; Zhang, Fan; Zhang, Tian; Huang, Weijiu

doi:10.1016/j.jallcom.2011.09.015

Cited by 68 publications

(21 citation statements)

References 28 publications

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“…ZrO 2 –Al 2 O 3 nanocomposites are often obtained by the sintering of compactified powders [11,26,27,28,29]. The microstructure of a ceramic depends upon the structure of the initial materials used for its synthesis, the dopant distribution used, the heating rate, and the sintering mechanism used.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

et al. 2018

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A novel method to obtain Al2O3–ZrO2 nanocomposites is presented. It consists of the co-precipitation step of boehmite (AlO(OH)) and ZrO2, followed by microwave hydrothermal treatment at 270 °C and 60 MPa, and by calcination at 600 °C. Using this method, we obtained two nanocomposites: Al2O3–20 wt % ZrO2 and Al2O3–40 wt % ZrO2. Nanocomposites were characterized by Fourier transformed infrared spectroscopy, Raman spectroscopy, X-ray diffraction, and transmission electron microscopy. Sintering behavior and thermal expansion coefficients were investigated during dilatometric tests. The sintering temperatures of the nanocomposites were 1209 °C and 1231 °C, respectively—approximately 100 °C lower than reported for such composites. We attribute the decrease of the sintering temperature to the specific nanostructure obtained using microwave hydrothermal treatment instead of conventional calcination. Microwave hydrothermal treatment resulted in a fine distribution of intermixed highly crystalline nanoparticles of boehmite and zirconia. Such intermixing prevented particle growth, which is a factor reducing sintering temperature. Further, due to reduced grain growth, stability of the θ-Al2O3 phase was extended up to 1200 °C, which enhances the sintering process as well. For the Al2O3–20 wt % ZrO2 composition, we observed stability of the zirconia tetragonal phase up to 1400 °C. We associate this stability with the mutual separation of zirconia nanoparticles in the alumina matrix.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

et al. 2018

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“…Spark plasma sintering (SPS) is a suitable sintering technique to obtain materials with ultrafine microstructure and high densification, which improve mechanical and tribological properties. This method has attracted considerable attention in comparison with other sintering processes due to advantages such as higher heating and cooling speed, high applied pressure and short dwell time that maintain the grain size and save energy …”

Section: Introductionmentioning

confidence: 99%

Wear behavior of conventional and spark plasma sintered Al₂O₃‐NbC nanocomposites

Alecrim

Ferreira

Salvador

et al. 2017

Int J Applied Ceramic Tech

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This study aims to investigate the dry sliding wear behavior of Al 2 O 3 -5vol.% NbC nanocomposites sintered by two different consolidation techniques: conventional sintering (CS) and spark plasma sintering (SPS) at temperatures ranging from 1450 to 1600°C. The dry sliding wear tests were performed on a tribometer with a ball-on-disc configuration using an Al 2 O 3 ball as a counterpart material, with a normal contact load of 15 and 30 N, a sliding distance of 2000 m and a sliding speed of 0.1 m/s at room temperature and ambient environment. The sintering methods, mechanical properties and applied load acted directly on the wear mechanism of the nanocomposites. The samples sintered by SPS exhibited higher densification and hardness, in addition to a lower friction coefficient and wear rate. Based on the wear rate, these nanocomposites exhibited a moderate regime with 15 N of load, and several regimes when 30 N of applied load was used. The main wear mechanisms observed were plastic deformation, abrasion and grain pull-out. The excellent results show that Al 2 O 3 -NbC nanocomposites are ideal for the manufacture of new products such as cutting tools. K E Y W O R D Salumina-niobium carbide, ceramic-matrix composite, cutting tools, sliding wear, spark plasma sintering

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“…Por fim, ao se comparar os valores de resistência obtidos com os da literatura observa-se alguma discrepância. A bibliografia (XING et al, 1998;CUTLER;HURFORD, 1999;XU et al, 2001;DENG et al, 2005;ZHANG et al, 2006) Quando se compara os resultados de dureza e tenacidade à fratura da Al 2 O 3 -TiC com os da literatura TANG, 1995;XING et al, 1998;CUTLER;HURFORD, 1999;XU et al, 2001;DENG et al, 2005;ZHANG et al, 2006) LIU et al, 2002;MACHADO et al 2011;MENG et al, 2012 A partir do mapeamento químico da Fig. 79 observa-se além dos principais elementos químicos correspondentes a cada ferramenta, Al, Ti, Zr, resíduo de Ca da alumina (15 ppm) e a presença de Fe e Mn do ferro fundido cinzento dentro da região lascada do inserto de FGM AlTiC, portanto logo se imagina lascas da ferramenta saindo por adesão (attrition) junto com o cavaco em condições propícias de elevada temperatura e pressão (TRENT; WRIGHT, 2000;MACHADO et al, 2011).…”

Section: Ensaios Mecânicosunclassified

Fabricação de ferramentas de corte em gradação funcional por Spark Plasma Sintering (SPS).

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Densification and mechanical properties of fine-grained Al2O3–ZrO2 composites consolidated by spark plasma sintering

Cited by 68 publications

References 28 publications

Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

Wear behavior of conventional and spark plasma sintered Al₂O₃‐NbC nanocomposites

Fabricação de ferramentas de corte em gradação funcional por Spark Plasma Sintering (SPS).

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Densification and mechanical properties of fine-grained Al2O3–ZrO2 composites consolidated by spark plasma sintering

Cited by 68 publications

References 28 publications

Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

Mechanism of Reduced Sintering Temperature of Al2O3–ZrO2 Nanocomposites Obtained by Microwave Hydrothermal Synthesis

Wear behavior of conventional and spark plasma sintered Al2O3‐NbC nanocomposites

Fabricação de ferramentas de corte em gradação funcional por Spark Plasma Sintering (SPS).

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Wear behavior of conventional and spark plasma sintered Al₂O₃‐NbC nanocomposites