Sintering behavior and thermal expansion of zirconia–titanium composites

Abstract

The dilatometric and thermogravimetric methods were used to investigate the sintering conditions of 3Y-ZrO 2 and 3Y-ZrO 2 -Ti composites. For the materials preparation, the nanometric zirconia stabilized by 3 mol% Y 2 O 3 powder and micrometric titanium powder (3 and 10 vol%) were used. The green body samples were formed by slip casting method. The morphology of samples microstructures was determined by SEM observations. The stereological analysis of zirconia and zirconia-titanium composites was carried out using computer program. The density was measured using the Archimedes method. The hardness of sinters was also investigated. Addition of Ti into ZrO 2 influenced the sintering behavior and thermal expansion of obtained composites. The analysis of the sintering process and characteristic temperatures confirmed the increase of onset and final temperature of shrinkage with the increase in Ti content. The changes of the thermal expansion curves for the pure zirconia and 3Y-ZrO 2 -Ti composites were the result of the aTi ? bTi transformation and the transition temperature of the zirconia m ? t transformation. The zirconia and composite samples were characterized by relative density about 98%, close to theoretical density. The slight growth of zirconia grains was observed.

A dynamic analysis of the aluminum titanate (Al2TiO5) reaction-sintering from alumina and titania, properties and effect of alumina particle size

“…Simultaneous thermogravimetric (TG) and differential thermal analysis (DTA) was performed on starting mixtures on Netzsch STA 409c equipment, at 10 °C min −1 heating rate in air atmosphere up to 1450 °C. To understand the sintering behavior, thermomechanical analysis on vertical prismatic sample (20.0 × 3.5 × 3.5 mm 3 ) was also performed, with a 5 °C min −1 heating rate in air atmosphere up to 1450 °C (TMA Rigaku Evo plus II, Japan); this has been recently carried out for ceramic based composites [21][22][23].…”

Sintering Behavior, Thermal Expansion, and Environmental Impacts Accompanying Materials of the Al2O3/ZrO2 System Fabricated via Slip Casting

“…Based on the results, it can be concluded that the ceramic fittings from Series I-0 vol.% of ZrO 2 and Series IV-100 vol.% of ZrO 2 had a very high relative density above 99%. It was noted that the relative density values for the samples containing 100 vol.% of ZrO 2 are slightly higher than the sample density values studied by Lada and her team [43]. In their work, they obtained samples (100 vol.% ZrO 2 ) produced via slip casting with a density of 98%.…”

“…In their work, they obtained samples (100 vol.% ZrO 2 ) produced via slip casting with a density of 98%. The differences in values may be due to the type of ZrO 2 powder used, the solid phase content of the slurry used, or the sintering process [ 43 ]. Based on the remaining density measurement results, the composites from the Al 2 O 3 /ZrO 2 system (Series II and III) were found to have a lower relative density than samples containing only Al 2 O 3 or ZrO 2 .…”

Al2O3/ZrO2 Materials as an Environmentally Friendly Solution for Linear Infrastructure Applications

“…The values obtained for Series IV (100 vol.% ZrO 2 ) are also higher compared to literature data [ 34 ]. In the work of Łada et al, a hardness equal to 11.87 ± 0.36 GPa was obtained for ZrO 2 shapes (TZ-3YS-E) formed by slip casting and sintered at 1450 °C [ 45 ]. The high hardness values obtained in our own research both for the samples of 100% Al 2 O 3 and ZrO 2 ceramics and Al 2 O 3 /ZrO 2 composites were most likely caused by the manufacturing method adopted—centrifugal slip casting.…”