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Manufacture of Toughened Al2O3-Based Composites by the Combination of RBAO and SPS Processes

Rocha-Rangel Enrique, Calles-Arriaga Carlos A., López-Hernández Juan, Rodríguez-García José A.

Archives of Metallurgy and Materials

2023

Vol. 68, iss. 1

249--255

The effect of additions of silver or titanium (0.5 or 3 vol.%) microparticles on the microstructure, as well as some physical properties of Al2O3-based composites, were studied. The processing method for the manufacturing of alumina-based composites was a combination of RBAO and SPS processes. After the SPS process, bodies with almost full density were obtained. Observations by optical microscopy show a very fine and homogenous microstructure in all samples. Concerning mechanical properties, the addition of metals on alumina increases its fracture toughness significantly (112% for the sample with additions of silver, while the composite with additions of titanium fracture toughness increases by 72%). In terms of optical properties, both silver and titanium improve the absorbance in the visible range.

Synthesis of SrTiO3 by the Calcination of SrCO3 and TiO2 Mixtures Intensively Ground by Means of High Energy Milling

Rocha-Rangel Enrique, Pech-Rodríguez Wilian J., López-Hernández Juan, Calles-Arriaga Carlos A., Armendáriz-Mireles Eddie N., Castillo-Robles José A., Rodríguez-García José A.

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 2

621--626

A SrTiO3 electroceramic with perovskite structure was produced by the calcination of a mixture of SrCO3 and TiO2 intensively grounded by high energy milling. For this purpose, raw materials were mixed in stoichiometric amounts in a planetary type mill; the obtained powder mixture was calcined for 2 h at temperatures between 800 and 1300°C. Samples resulting from the calcination were characterized by XRD, FTIR, SEM analysis and electrical measurements. From XRD, it was determined that the SrTiO3 formed presents the cubic structure of perovskite. The complete reaction for SrTiO3 compound formation occurs at 1200°C. Micrograph observations indicate the presence of a homogeneous microstructure with tiny grain size. The measured values of electrical resistivity were within the typical range of insulating materials.