Mechanical and Microstructural Properties of TiO 2 doped Zirconia Toughened Alumina (ZTA) Ceramic Composites at different TiO 2 contents (original) (raw)
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Ceramics International, 2015
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. www.elsevier.com/locate/ceramint Effects of TiO 2 addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina ceramic composite Effects of TiO 2 addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina ceramic composite
Effect of Titania and Magnesia on the Physical Properties of Zirconia Toughened Alumina
Materials Science Forum, 2016
ZTA based ceramic composite system is widely accepted as cutting tools for many of these harder and wear resistant workpiece materials. This is due to their beneficial mechanical properties i.e. high temperature strength, high hardness and ability to maintain its cutting edge shape at higher temperatures. Although a lot of works have focused on the effect of various sintering additives on the ZTA ceramic system, the effect of Magnesia (MgO) and Titania (TiO2) on ZTA has not yet been studied. In this work, the physical properties of Zirconia Toughened Alumina (ZTA) ceramic composite with MgO and TiO2 as additives was investigated. The composition of TiO2 varied from 0 wt% to 3.5 wt% whereby other materials such as Al2O3, Yttria Stabilized Zirconia (YSZ) and MgO were kept at constant weight percentage. Sintered samples were then tested and analyzed by XRD, Vickers hardness and high precision densimeter to investigate phase content, hardness value and densification respectively. Result...
Processing and properties of zirconia-toughened alumina ceramics
Bulletin of Materials Science, 1994
AlaO3:ZrO2 ceramics have been prepared from physically mixed puro oxide powders. The results indicate that careful processing of the starting powders and a two-stage sintering process can avoid expensive processing methods like hot pressing/hot isostatic pressing used for achieving high densification. The mechanical properties were measured and the resultant microstructure studied to explain the toughening behaviour of this material.
MECHANICAL PROPERTIES OF ZIRCONIA TOUGHENED ALUMINA PREPARED BY DIFFERENT METHODS
Le Journal de Physique Colloques, 1986
Resume -Des ceramiques alumineuses renforcees par de l a zircone ont Gte -preparees par deux procedes d i f f e r e n t~ a p a r t i r des memes matieres premieres (poudres). Le premier u t i l i s e l e broyage par a t t r i t i o n e t l a compression I chaud ; l e second, une dispersion 6lectrochimique, l e coulage en barbotine e t l e f r i ttage sans charge. L'influence des parametres d'elaboration sur les proprietes mecaniques des pieces denses e s t examinee. L'influence des teneurs en ZrOz e t Y203 e s t discutee.
IJERT-Structural and Mechanical Properties of Zirconia Toughened Alumina (ZTA) Composites
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/structural-and-mechanical-properties-of-zirconia-toughened-alumina-zta-composites https://www.ijert.org/research/structural-and-mechanical-properties-of-zirconia-toughened-alumina-zta-composites-IJERTV3IS20451.pdf The Zirconia toughened Alumina (ZTA) composites with 0-16 wt % of ZrO 2 were prepared by slurry method and sintered at temperature (T s) 1500°C and 1600°C for 2 hours. The density, porosity, structural properties and mechanical properties of Al 2 O 3-ZrO 2 composites with respect to ZrO 2 content as well as sintering temperature have been explored in the present work. About 2% higher density of 16 wt % ZTA has been achieved and the microstructures are highly homogeneous and finer with less porosity when compared to pure Al 2 O 3. The surface morphology of the samples was studied by using SEM. The effect of zirconia content on hardness and elastic modulus were investigated. At 1500°C, maximum hardness shows 15.79 GPa and at 1600°C, it is 19.76 GPa, which is observed for pure Alumina. However, at same temperatures, minimum hardness shows 11.24 GPa and 12.96 GPa, respectively, that is observed for 16 wt% ZrO 2. Elastic modulus also shows same behaviour as shown for hardness. Flexural strength increases with the increase of both zirconia content and sintering temperature. The approach adopted in the present study may provide an alternative to design Al 2 O 3-ZrO 2 composites with improved mechanical properties.
Effect of sintering curves on the microstructure of alumina–zirconia nanocomposites
Ceramics International, 2014
Zirconia-toughened alumina (ZTA) ceramics of various compositions have high relevance in the field of mechanical engineering for cutting tools and wear parts as well as in biomedical applications for hip and knee implants. In this study a matrix of submicron size a-alumina is reinforced with 10 vol% unstabilized zirconia nanoparticles. The ZTA ceramics were consolidated by means of hot pressing at 1400-1550°C at 60 MPa axial pressure for 1 h in order to test the influence of the sintering conditions on the mechanical properties, microstructure and phase composition. Despite the conventional mixing and milling method used, ZTA nanocomposites of high homogeneity were obtained. Low sintering temperatures result in ultra-fine-grained materials with high hardness. High strength of 900-1050 MPa was observed over the whole sintering temperature range, while toughness rises with sintering temperature. A clear correlation between transformability of the tetragonal phase and toughness cannot be identified. Highest strength was found for ZTA with a low initial monoclinic content and high transformability. Increasing sintering temperatures led to only slight microstructural coarsening but to a migration of zirconia particles and rising monoclinic content. Associated with these effects, a gradual shift from transformation toughening to microcrack toughening was observed.
Effect of sintering additives on the properties of alumina toughened zirconia (ATZ)
MRS Communications
The effect of small amounts of copper oxide, manganese oxide, and stainless steel as sintering additives on the sintering behavior and mechanical properties of Alumina Toughened Zirconia (ATZ, 3Y-TZP with 20 wt% Al2O3) ceramic composites were evaluated and contrasted with that of undoped ATZ by using microwave sintering (MW) method. Green bodies were sintered at 1250°C, 1350°C, and 1500°C using a holding time of 5 min., with a heating rate of 30°C /min. In general, all ATZ samples exhibited a similar trend, as the results showed that the relative density and mechanical properties increased with increasing sintering temperature regardless of the addition of dopants. It was found that the addition of 0.2 wt% CuO, 0.5 wt% MnO2, and 0.2 wt% SS were beneficial in enhancing the densification and improving the mechanical properties of ATZ without inducing grain coarsening. The ATZ composite samples' relative density, tetragonal phase stability, microstructural evolution, Vickers hardne...
Materials, 2013
Alumina-zirconia (AZ) composites are attractive structural materials, which combine the high hardness and Young's modulus of the alumina matrix with additional toughening effects, due to the zirconia dispersion. In this study, AZ composites containing different amounts of zirconia (in the range 5-20 vol %) were prepared by a wet chemical method, consisting on the surface coating of alumina powders by mixing them with zirconium salt aqueous solutions. After spray-drying, powders were calcined at 600 °C for 1 h. Green bodies were then prepared by two methods: uniaxial pressing of spray-dried granules and slip casting of slurries, obtained by re-dispersing the spray dried granulates. After pressureless sintering at 1500 °C for 1 h, the slip cast samples gave rise to fully dense materials, characterized by a quite homogeneous distribution of ZrO 2 grains in the alumina matrix. The microstructure, phase composition, tetragonal to monoclinic transformation behavior and mechanical properties were investigated and are here discussed as a function of the ZrO 2 content. The material containing 10 vol % ZrO 2 presented a relevant hardness and exhibited the maximum value of K I0 , mainly imputable to the t → m transformation at the crack tip.
THE INFLUENCE OF SINTERING TECHNIQUE ON MICROSTRUCTURE AND PROPERTIES OF ZrO2/Al2O3 COMPOSITE
2020
The following paper presents the results of investigations on the microstructure and mechanical properties of sintered composites in the zirconia-alumina system, fabricated by various sintering techniques. The investigations were performed for a particulate composite consisting of two continuous ceramic phases – zirconia (TZP) and alumina (α-Al2O3), 50 vol.% each. Two different methods were used to produce the samples: pressureless sintering and the U-FAST technique. The microstructure of the obtained sintered composite samples was evaluated using a scanning electron microscope. In addition, the density of the sintered bodies, their hardness and fracture toughness were investigated to evaluate the mechanical properties. Based on the obtained results of the investigations, the influence of the sintering technique on the microstructure and mechanical properties of the sintered composites was determined.