Influence of microstructure on the erosive wear behaviour of Ca α-sialon materials

Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics

“…2b represent the center of the wear crater on zirconia worn surfaces, showing that the LT group presents least pit formation. Micropitting is caused by the presence of shallow lateral cracks beneath the wear surface, which can propagate parallel to but eventually intersect with the wear surface, leading to the dislodgement of flakes of zirconia [29]. In addition, micropits were mainly present around the center of the crater where the maximum load is achieved during sliding.…”

“…3d). The severe wear areas were frequently associated with cracks that would either evolve to deep penetrating partial cone cracks [26] or to shallow lateral cracks that lead to the spalling of a smeared zirconia layer and creating micropits with exposed grain facets [29]. …”

Silicon nitride and silicon carbide-based ceramics

“…Compared to Si 3 N 4 and SiC, sialon ceramics have greater phase complexity and more degrees of freedom for tailoring of microstructures and consequently mechanical properties. It was also found that a high α-sialon content coupled with low intergranular glass and pore contents gave an optimized hardness (Zhang et al, 2001;Zhang and Cheng, 2003). The microstructural-mechanical properties relation of the Ca α-sialon materials has been studied in detail previously (Zhang et al, 2001;Zhang and Cheng, 2003).…”

“…The elongated grain morphology can have at least two beneficial effects on erosion resistance of ceramic materials (Zhang et al, 2001): it can enhance crack deflection and bridging by blocking the crack path, forcing the crack to detour; and it can hinder grain dislodgment due to an interlocking effect. Grain boundary glass fills into the pores and facilitates the particle rearrangement during the sintering and also has the potential to absorb or cushion the stress induced from solid particle impact via viscous flow.…”

Mechanical and erosion-resistance properties of slag α-sialon ceramics

“…The ploughing mechanism is associated with the plastic smearing and cutting of the materials, while the repeated impact mechanism is responsible for initiating and propagating grain boundary microcracks. 8 Ceramics have high hardness and low toughness, and thus they are not easily plastically deformed, but cracks readily propagate to form a crack network. Therefore, the material removal rate is low at low angle impact and high at high angle impact.…”