Abstract
Novel 1:1 Yttria partially stabilized zirconia (PSZ) - aluminum borate (AB: Al11B4O33) ceramic composites were prepared and characterized by a simple direct sintering process of PSZ-mixtures. Sintering was performed below 1300?C to minimize the decomposition of borate. Phases were corroborated by XRD. SEM permitted to characterize the microstructure as interlocking needles of - rounded by PSZ grains. Porous microstructure configuration was achieved by the proposed processing route. Porosity was within 30% for samples thermally treated at 1200 and 1300?C. Mechanical behavior was evaluated by diametral compression. A fragile behavior was observed. Both strength and apparent Young modulus were evaluated being ?30 MPa and ?3 GPa respectively; values four times higher than the corresponding alumina-AB composite. This is more important when firing at higher temperature. The density of the obtained composites coupled with the mechanical behavior are the main characteristics of this novel composite with potential structural, insulating and filtering applications.
Highlights
IntroductionThe designing capability of properties and behaviors is enhanced by combining the combination of two or more different materials
Composite materials have an important industrial and technological role
Fine Zirconia powders started sintering above 1100 °C [4, 26], the aluminum borate (AB) powders sinters at a similar temperature, as studied elsewhere [21]
Summary
The designing capability of properties and behaviors is enhanced by combining the combination of two or more different materials. The properties of the composite will not always be the average between the pure material ones, rather, the properties can be considerably improved if appropriate design is performed [1]. In ceramics field, both mono-phasic and multiphasic ceramics present distinctive features and have been employed in many different fields, from structural ceramics, nuclear functions, biomaterials, energy materials, etc. The most employed dopants are yttrium, cerium, calcium and magnesium, but other cations are used (La, Gd, etc.).
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