Microwave Sintering of Zirconia Materials: Mechanical and Microstructural Properties

Int J Applied Ceramic Tech

Moreno

et al. 2014

Self Cite

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.

Section: Characterization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Benavente

Int J Applied Ceramic Tech

Moreno

et al. 2014

Self Cite

“…A value of 95.2% has been determined for the MW samples at 1200 °C, which is relatively low for this type of material sintered under these conditions. It was expected that it would reach at least 97% [7]. However, this relative density value is still slightly above that of the CS sample that was sintered at 1300 °C.…”

Section: Resultsmentioning

confidence: 90%

“…Samples were introduced in a rectangular cavity that is automatically adjusted to optimize microwave absorption by the material and control the heating rates (100 °C/min) and sintering temperature (1200 and 1300 °C). Sintering parameters were previously introduced in the control software [7,8].…”

Section: Methodsmentioning

confidence: 99%

Mechanical Characterization of Conventional and Non-Conventional Sintering Methods of Commercial and Lab-Synthesized Y-TZP Zirconia for Dental Applications

Presenda

13th International Ceramics Congress - Part A

Peñaranda‐Foix

et al. 2014

Self Cite

Abstract. Ceramics for dental applications have become increasingly important in the last decades. Particularly, the introduction of yttria-stabilized zirconia tetragonal polycrystalline (Y-TZP) materials as an alternative to the manufacturing of dental implants and prosthesis has provided a powerful tool to meet the demands required for these replacements in terms of biocompatibility, toughness, hardness and optical properties. Several commercial Y-TZP materials are currently available on the market and strong efforts in research and development facilities are being carried out to improve processing of Y-TZP to fully consolidate odontological pieces. Novel processing methods for ceramic powder sintering, including Y-TZP, aim to reduce processing times and production costs significantly, while maintaining or even improving the resulting microstructure and mechanical properties of the material. One of these methods includes microwave sintering. The purpose of this study is to characterize and compare the resulting properties of Y-TZP materials after conventional sintering and the non-conventional method of microwave heating. In this work one commercial material and one laboratory-synthesized Y-TZP powder are considered. The results suggest that microwave sintering results, generally, in better mechanical properties of the material in terms of hardness and fracture toughness than conventional sintering.

“…The samples were sintered by hybrid microwave heating in air, assisted by SiC susceptor. All samples sintered by microwave heating (MW) using a heating rate of 100 ºC/min and samples sintered by conventional sintering (CS) underwent heating at a rate of 5 ºC/min [9]. Al 2 O 3 -15vol.% ZrO 2 samples were sintered by MW radiation at 1200, 1300 and 1400 ºC with a 1 min holding time at the maximum temperature.…”

Section: Methodsmentioning

confidence: 99%

Microwave Technique: A Powerful Tool for Sintering Ceramic Materials

Borrell¹,

Miranda

et al. 2014

CNANO

Microwave sintering has emerged in recent years as a promising technology for faster, cheaper and eco-friendlier processing of a wide variety of materials, which are regarded as significant advantages against conventional sintering procedures. The present investigation describes a technique for sintering two different ceramic materials by microwave heating: alumina-15vol.% zirconia and hydroxyapatite nanopowders. The results show that microwave sintering achieves higher density values, excellent mechanical properties and a homogeneous microstructure at lower sintering temperatures. The densities of microwave processed samples were close to the theoretical densities, and the near-netshape of the green body was preserved without significant dimensional changes. The main advantages of microwave heating can be summarized as follows: a more flexible process, reduced processing times and production costs, and environmental benefits. Thus, microwaves are a clear alternative to conventional heating methods, using up to 70% less energy throughout the whole sintering process.