Microindentation fracture behavior of surface modified alumina ceramic using glass infiltration

Influence of glass phase on Al2O3 fiber-reinforced Al2O3 composites processed by slip casting

“…XRD peaks shifts indicating residual compression are reported in other studies [9,14] where low coefficient of thermal expansion (CTE) glass is used for infiltration. However for the La-3 glass composition used in the present study, the CTE measured by dilatometer was found to be ∼7.6 × 10 −6 / • C which was in proximity to alumina ceramics (8.1 × 10 −6 / • C) [9,13]. Fig.…”

“…Dense ceramic is achievable through glass infiltration process in porous ceramics [5][6][7]. The glass infiltration technique can improve the mechanical properties of the ceramic by increasing the density and by generation of compressive residual stress on the surface and the blunting of fine surface cracks produced during the sintering and machining process [4,8,9]. The most commonly used technique to obtain a porous ceramic or 'preform' involves pre-sintering, i.e.…”

Mechanical properties of pressure-less sintered zirconia–magnesium aluminum silicate glass composite

“…The MAS glass was fabricated by melting the mixture of magnesium oxide (MgO; 29.98 mol%), Al 2 O 3 (9.98 mol%), and silicon dioxide (SiO 2 ; 60.02 mol%) in a platinum crucible at 1600 C for 2 h in air and then quenched in water at room temperature. The coefficient of thermal expansion (CTE) of glass (25-1000 C) was calculated as 5 Â 10 À6 / C. 11 This MAS glass was crushed into fine powder (-200 mesh size) using an Al 2 O 3 pestle and mortar. The ZrO 2 powder was blended with 10 wt% MAS glass powder in ethanolic medium for 30 min.…”

Effect of Pore Characteristics in Slip Cast Alumina on Glass Infiltration and Mechanical Properties of the Composites

“…Fracture toughness value of glass-infiltrated CT8_50 and CT8_75 samples was comparable to that reported in the literature. 10,26,32 It was observed that fracture toughness increased with increase in content of coarser alumina particles. 30,31 It was attributed to residual porosity, as well as tensile (circumferential) thermal residual stress arising from slightly higher thermal expansion coefficient of glass than alumina.…”

“…In addition, ceramics exhibit superior wear resistance, low thermal conductivity and good chemical resistance. 9,10 In glass-infiltrated ceramics, the three dimensional network of interlocking ceramic and glass develops high resistance to crack propagation, resulting in improved fracture toughness. Unfortunately, ceramics also are brittle, have low tensile strength, and are prone to degradation in a moist environment.…”