Three different alumina–zirconia composites: Sintering, microstructure and mechanical properties

Pulgarín, Heidy Lorena Calambás; Albano, María P.

doi:10.1016/j.msea.2015.05.010

Cited by 16 publications

(9 citation statements)

References 15 publications

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“…Further raise of the sintering temperature to 1600°C resulted in a significant increase of the alumina particle size as a result of rapid grain growth, causing closure of the majority of the intergranular pores. The observed microstructural changes of the alumina particles are in agreement with those reported by Pulgarin and Albano [44]. The presence of molten SOD tends to fill the intergranular spaces, prevent irregular alumina grain growth, and diminish the porosity of the composite material, as seen in Figure 6.…”

Section: Morphological Analysessupporting

confidence: 90%

Effect of sintering temperature on the microstructures and mechanical properties of sodalite infiltrate all-ceramic material for dental restorations

Naji

Omar

Dabbagh

et al. 2017

Advances in Applied Ceramics

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Potassium bromide sodalite (KBr-SOD) zeolite has been developed to enhance the mechanical properties of these restorations using a direct in situ hydrothermal condition followed by the sintering process. The purpose of this study was to determine the effects of sintering temperature on the microstructures and mechanical properties of porous alumina (A) and zirconia-toughened alumina (ZTA) discs infiltrated by KBr-SOD. Hundred and twenty discshaped samples were sintered at various temperatures and prepared for biaxial flexural strength and Vickers microhardness tests. The results showed that sintering temperatures from 1100 to 1600°C for both A-SOD and ZTA-SOD samples has resulted in a significant improvement in the density (2.8 and 1.1%, respectively), flexural strength (257 and 254%, respectively), Vickers hardness (109 and 112%, respectively), and Weibull modulus (7.5 and 3%, respectively). The present study concludes that infiltrated SOD material sintered at 1600°C is suitable for the fabrication of all-ceramic dental prostheses with adequate mechanical properties.

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Section: Morphological Analysessupporting

confidence: 90%

Effect of sintering temperature on the microstructures and mechanical properties of sodalite infiltrate all-ceramic material for dental restorations

Naji

Omar

Dabbagh

et al. 2017

Advances in Applied Ceramics

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“…When more alumina was added, in A20 to A50, the modulus gradually declined to the lowest value at 50 vol% alumina. The obtained flexural modulus values are the first reported values for powder injected zirconia-alumina composites [3,6,11]. Compared to flexural modulus of zirconia-alumina systems formed by other fabrication methods, the flexural modulus values from the current study are lower since the technique allows less compaction.…”

Section: Flexural Propertiesmentioning

confidence: 49%

“…Studies on the system have been done using simple fabrications such as tape casting and pressing. These studies showed that variation of constituent ratio leads to changes in mechanical properties [6][7][8][9][10][11][12]. None of the past studies has utilized PIM for the fabrication of alumina-toughened zirconia.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of zirconia-alumina composites fabricated via powder injection molding

2021

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This study aimed to fabricate zirconia-alumina composites via powder injection molding and investigated the effects of alumina addition on microstructure as well as physical properties of the composites. Zirconia-alumina composites were prepared using polyethylene glycol (PEG) and polyvinyl butyral (PVB) as binders. The powder loading was fixed at 38 vol%, and PEG: PVB binder weight ratio was fixed at 80:20. Alumina content within ceramic component was varied at 0, 10, 20, 30, 40 and 50 vol% to observe the effect of alumina on the composite structures and properties. The injection molding was done at 190℃ followed by water debinding of PEG at 40℃. Thermal debinding of PVB at 450℃ was performed prior to sintering at 1450℃. From the density measurement via Archimedes’ method, the relative density of sintered samples was found to be highest at 10 vol% alumina and gradually lower at higher alumina content. The condition with highest density yielded the highest flexural modulus and flexural strength. XRD indicated that tetragonal zirconia phase coexisted with alumina when alumina was added. Above 20 vol% alumina, monoclinic zirconia was also detected. The increased porosity in samples with high alumina content, as confirmed in SEM morphological observation, correlated with lower flexural strength and lower flexural modulus. The results illustrated the feasibility of powder injection molding in the production of zirconia-alumina composites and the optimum condition in this study was 10 vol% alumina.

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“…Zirconia ceramics are usually fabricated via solid state sintering at high temperatures of around 1500-1600°C [1,7], which is a relatively expensive fabrication method that increases production costs. In order to lower the sintering temperature of ZrO 2 , additives are deliberately introduced such as Fe 2 O 3 , SiO 2 , Al 2 O 3 , TiO 2 , and others [8].…”

Section: Introductionmentioning

confidence: 99%

Processing of Concentrated Aqueous Zirconia-Bioglass Slips by Slip Casting

León¹,

Albano²,

Stábile³

et al. 2017

Ceramics - Silikaty

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Three different alumina–zirconia composites: Sintering, microstructure and mechanical properties

Cited by 16 publications

References 15 publications

Effect of sintering temperature on the microstructures and mechanical properties of sodalite infiltrate all-ceramic material for dental restorations

Effect of sintering temperature on the microstructures and mechanical properties of sodalite infiltrate all-ceramic material for dental restorations

Microstructure and properties of zirconia-alumina composites fabricated via powder injection molding

Processing of Concentrated Aqueous Zirconia-Bioglass Slips by Slip Casting

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