Mechanical properties and microstructures of reaction sintered mullite–zirconia composites in the presence of an additive — dysprosia

Densification Study and Mechanical Properties of Microwave-Sintered Mullite and Mullite-Zirconia Composites

“…It can be noted that the uniform microstructure and better packing of grains of 10ZrM samples resulted in a maximum hardness of ∼10.24±0.61 GPa, compressive strength of ∼740±38 MPa and a moderately high indentation fracture toughness of ∼3.65±0.43 MPa·m 1/2 after sintering at 1500°C in microwave furnace. In contrast, grain growth and formation of more glassy phase in the grain‐boundary region caused by the prolong heating cycle of conventional sintering reduce the mechanical properties of mullite–zirconia composites 52 . Our microwave‐sintered zirconia‐reinforced mullite composites results clearly demonstrate that the mechanical properties are strongly influenced by the microstructure, and observed to be comparable if not better than those of earlier reported conventionally sintered samples with similar composition.…”

Effects of added aluminum chromium slag on the structure and mechanical properties of colored zirconia ceramics

“…As the aluminum chromium slag content grew, the relative density of samples sintered at different temperatures showed a declining trend. The relative density of ceramic composite depends on numerous characteristics, including the solid solution, secondary precipitated phase, lattice expansion, and micro‐crack formation 38 . These factors eventually determine porosity and structural compactness.…”

Development and evolution of a novel (Zr1-xSnx)O2 toughened alumina-mullite slip cast refractory: Effect of SnO2

“…Reaction sintering of stoichiometric 3:2 mullite occurs according to the following reaction; 3Al2O3(s) + 2ZrSiO4(s) + (CaO/TiO2/MgO)/heat = Al6Si2O13 + 2ZrO2 ………………. (1) where, CaO [14]; TiO2 [15][16][17][18]; MgO [19,20]; La2O3 [21]; Dy2O3 [22]; are some of the additives employed in the starting formulation mix, as sintering agents, that have been reported in the literature to enhance densification and/or mullitisation through liquid phase sintering from the dissociated zircon and lowering of the mullitisation temperature [14][15][16][17][18][19][20][21][22]. Among these reported additives, TiO2 additions up to 4wt.…”