Synthesis of zirconia toughened alumina (ZTA) fibers for high performance materials

Pfeifer, Stephanie; Demirci, Pinar; Duran, Rueya; Stolpmann, Heiko; Renfftlen, Achim; Nemrava, S.; Niewa, Rainer; Clauß, Bernd; Buchmeiser, Michael R.

doi:10.1016/j.jeurceramsoc.2015.10.028

Cited by 54 publications

(14 citation statements)

References 24 publications

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“…The mechanical stability of fibrous ceramics can be increased by applying ceramic fibre with adequate stability and mechanical properties, such as alumina or zirconia. The incorporation of 20–30 wt% ZrO 2 in an Al 2 O 3 matrix leads to a ceramic composite called zirconia-toughened alumina (ZTA) featuring considerably enhanced hardness [ 19 , 20 , 21 , 22 ] and fracture toughness [ 23 , 24 ] compared to pure alumina and zirconia. Both Al 2 O 3 and ZrO 2 ceramic fibres can be synthetized from an electrospun precursor [ 25 ] in a simple manner, but only a few papers have been published on the production of ZTA composite fibres so far [ 21 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

et al. 2022

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This paper investigated a synthesis process for highly porous Al2O3, Y-ZTA, and Ce-ZTA ceramic nanocomposites with gradient microstructure and improved mechanical properties. Ceramic nanofibres were synthesized as the starting material. The gradient microstructure was developed during spark plasma sintering using an asymmetric graphite arrangement that generated significant temperature differences (80–100 °C) between the opposite sides of the samples. Structural and mechanical properties of the fibrous ceramic composites were investigated. The effect of the temperature gradient on properties was also discussed. While the asymmetric configuration resulted in a gradient porosity, reference samples fabricated in standard graphite configuration were uniformly porous. The gradient structure and the ZrO2 addition led to improved hardness and compression strength of the sintered samples. However, the opposite sides of the samples exhibited considerable variations in both microstructure and in terms of properties. The upper part of the Ce-ZTA ceramic showed a highly porous structure with 18.2 GPa hardness, while the opposite side was highly densified with 23.0 GPa hardness. Compressive strength was 46.1 MPa and 52.1 MPa for Y-ZTA and Ce-ZTA sintered at 1300 °C, respectively, despite their high porosity. The research provided a promising approach to prepare highly porous ZTA composites with high strength for a wide range of applications.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

et al. 2022

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“…As a ceramic reinforcing phase, ZTA has been widely used in the field of making cermets. It was found in the study that the toughness of ZTA is greater than 12MPa m 1/2 , which is several times than pure Al 2 O 3 ceramics [5,6].The ZrO 2 contained in ZTA undergoes a phase transition of t-ZrO 2 →m-ZrO 2 when subjected to stress, and compressive stress is generated at the crack tip during phase transformation, so that the crack closes under the tensile loading [7,8]. Moreover, the coefficient of thermal expansion (CTE) of ZTA is closer to the iron matrix [9].…”

Section: Introductionmentioning

confidence: 83%

Microstructure and mechanical properties of Fe-ZTA cermet prepared by vacuum hot-pressed sintering

Sun

Jiang

Sun

et al. 2020

Mater. Res. Express

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The cermet based on metallic iron with zirconia toughened alumina (ZTA) as the reinforcing phase was prepared by vacuum hot-pressed sintering. The ZTA particles were subjected to electroless nickel plating to improve the interfacial bonding ability of ZTA and Fe matrix. In this paper, after electroless nickel plating, the effects of different particle sizes and different contents of ZTA particles on the grinding properties of Fe-based ZTA (Fe-ZTA) cermets were investigated. The results show that the ZTA particles are tightly bound to the Fe matrix. An interface layer is formed between the ZTA particles and the Fe matrix and it can improve the grinding ability of the Fe-ZTA cermet. By reducing the particle size and the content of ZTA particles, the friction coefficient between Fe-based ZTA cermet and the machined surface can be increased, and the surface roughness of the machined surface will reduce. When the ZTA particle size is F14 and the iron binder content is 40%, the friction coefficient between the Fe-ZTA cermet and the steel bar is 0.4981, the surface roughness of steel bar is 40.164 μm, the grinding ratio is 685.952.

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“…Sie wird bis heute fortgeführt. [3][4][5][6][7] Inzwischen arbeiten die Forscher:innen auf industrienahen Pilotanlagen. DITF…”

Section: Aus Keramik Fasern Herstellenunclassified

Werkstoffe: Oxidkeramische Fasern

Clauß¹,

Pfeifer²,

Reinders³

et al. 2021

Nachr Chem

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Synthesis of zirconia toughened alumina (ZTA) fibers for high performance materials

Cited by 54 publications

References 24 publications

Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

Microstructure and mechanical properties of Fe-ZTA cermet prepared by vacuum hot-pressed sintering

Werkstoffe: Oxidkeramische Fasern

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