Microwave sintering of transparent alumina

Cheng, Jiping; Agrawal, Dinesh Kumar; Zhang, Yunjin; Roy, Rustum

doi:10.1016/s0167-577x(02)00557-8

Cited by 174 publications

(94 citation statements)

References 1 publication

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“…The creation of ceramic materials with high translucency has been done in the past by means of increasing the grain size during sintering. 5 Lager grains lead to a smaller number of grain boundaries, therefore reducing light scattering. For Y-TZP, it has been shown that larger grains are detrimental for both the mechanical properties and the stability of the tetragonal phase.…”

Section: Monolithic Zirconia Restorationsmentioning

confidence: 99%

Dental ceramics: a review of new materials and processing methods

et al. 2017

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The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics. The objective of this literature review is to discuss the main advantages and disadvantages of the new ceramic systems and processing methods. The manuscript is divided in five parts: I) monolithic zirconia restorations; II) multilayered dental prostheses; III) new glass-ceramics; IV) polymer infiltrated ceramics; and V) novel processing technologies. Dental ceramics and processing technologies have evolved significantly in the past ten years, with most of the evolution being related to new microstructures and CAD-CAM methods. In addition, a trend towards the use of monolithic restorations has changed the way clinicians produce all-ceramic dental prostheses, since the more aesthetic multilayered restorations unfortunately are more prone to chipping or delamination. Composite materials processed via CAD-CAM have become an interesting option, as they have intermediate properties between ceramics and polymers and are more easily milled and polished.

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Section: Monolithic Zirconia Restorationsmentioning

confidence: 99%

Dental ceramics: a review of new materials and processing methods

et al. 2017

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“…Microwave sintering has several advantages such as rapid and volumetric heating, improved production rate, enhancement in densification and grain growth prohibition of ceramics [17,18].…”

Section: Introductionmentioning

confidence: 99%

Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

Benavente

Salvador

Moreno

et al. 2014

Int J Applied Ceramic Tech

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Lithium aluminosilicate was fabricated by conventional and non-conventional sintering:microwave and spark plasma sintering, from 1200 to 1300 ºC. A considerable difference in densification, microstructure, coefficient of thermal expansion behavior and hardness and Young's modulus was observed. Microwave technology made possible to obtain fully dense glass-free lithium aluminosilicate bulk material (>99%) with near-zero and controlled coefficient of thermal expansion and relatively high mechanical properties 1 (7.1 GPa of hardness and 110 GPa of Young's modulus) compared to the other two processes. It is believed that the heating mode and effective particle packing by microwave sintering are responsible to improve these properties.

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“…Microwave sintering has several advantages such as rapid end volumetric heating, improved production rate, enhancement in densification and grain growth prohibition of ceramics [17][18][19]. This technique generally uses a frequency of 2.45 GHz resulting in relatively rapid heating rates with uniform grained microstructures and has been employed for the sintering of a wide variety of ceramics ranging from dielectric materials to transparent ceramics.…”

Section: Introductionmentioning

confidence: 99%

Improvement of microstructural properties of 3Y-TZP materials by conventional and non-conventional sintering techniques

Borrell

Salvador

Rayón

et al. 2012

Ceramics International

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Abstract3 mol% Y 2 O 3 -stabilized zirconia nanopowders were fabricated using various sintering techniques; conventional sintering (CS) and non-conventional sintering such as microwave (MW) and pulsed electric current-assisted-sintering (PECS) at 1300 ºC and 1400 ºC. A considerable difference in the densification behaviour between conventional and non-conventional sintered specimens was observed. The MW materials attain a 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 bulk density 99.4% theoretical density (t.d.) at 1300 ºC, while the CS materials attain only 92.5% t.d. and PECS 98.7% t.d. Detailed microstructural evaluation indicated that a low temperature densification leading to finer grain sizes (135 nm) could be achieved by PECS followed by MW with an average sintered grain size of 188 nm and CS 225 nm. It is believed that the high heating rate and effective particle packing are responsible for the improvements in these properties. *Manuscript Click here to view linked References

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Microwave sintering of transparent alumina

Cited by 174 publications

References 1 publication

Dental ceramics: a review of new materials and processing methods

Dental ceramics: a review of new materials and processing methods

Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

Improvement of microstructural properties of 3Y-TZP materials by conventional and non-conventional sintering techniques

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