Microstructure and mechanical properties of yttria stabilized zirconia/silicon carbide nanocomposites

Toughening and strengthening of ceramics composite through microstructural refinement

“…Ceramic-based nanocomposite is one of the particulate-reinforced composites in which the nano-sized particulate is dispersed within the matrix grains and/or at the grain boundaries [3]. Dispersion of zirconia (ZrO 2 ) grains in ceramics is an effective method to enhance the fracture toughness of the matrix either by taking advantage of the stress-induced martensitic transformation of ZrO 2 from the tetragonal to monoclinic phase, which absorbs the fracture energy, or by crack blending caused by microcracks and residual stress introduced owing to volumetric expansion during cooling of ZrO 2 grains [4].…”

Fracture toughness (KIC), hardness, sintering and grain growth behaviour of 8YSCZ/Al2O3 composites produced by colloidal processing

“…A reduction in grain boundary energy occurs when intergranular phases pin the grain boundaries. The effectiveness of using Al 2 O 3 to pin grain boundaries and limit grain growth can be estimated by Zener pinnig [5] which shows the dependence of the grain size of matrix on the volume and grain size of second phase.…”

“…Among zirconia phases, yttria-stabilized cubic zirconia (YSCZ) with fluorite structure is well known as a solid electrolyte that possesses high oxygen ionic conductivity and chemical stability over wide ranges of temperature and oxygen partial pressure and thus it is widely used as an oxygen sensor, thermal barrier and solid oxide fuel cell (SOFC) [5]. 0925 In these applications, not only high conductivity, but also better mechanical, chemical and electrical stability are required.…”

Deposition of Compositionally Graded Mullite/Alumina Coatings from Mixtures of SiCl4, AlCl3, CO2 and H2

“…Deposition of the mullite/alumina layer was started at 100 cm 3 min ±1 total flow rate in order to obtain an initial film composition of approximately 71±72 % alumina. The total flow rate was then increased from 100 cm 3 min ±1 to 600 cm 3 stage had a thickness of about 4 lm. In the second stage, the silicon tetrachloride mole fraction in the feed was slowly reduced in three steps from 5 10 ±4 to 0, and in this way, three additional layers of 3±4 lm thickness each were formed.…”