Mechanical properties of alumina/zirconia composites

Effects of flake-shape and content of nano-mullite on mechanical properties and fracture process of corundum composite ceramics

“…In order to achieve a low sintering temperature, a high content of 25% mullite is necessary, where the optimal sintering temperature is reduced to1550° C. Accordingly, the flexural strength and fracture toughness are 263.7 MPa and 5.0 MPa•m 1/2 , respectively. Comparatively, the mechanical performances are higher than those reported in the open literature [29][30][31]36]. Figure 13 shows the effects of mullite content and sintering temperature on critical crack size and work of fracture.…”

“…The mechanical properties of alumina ceramics are dependent on various factors, such as particle size of raw materials [28][29][30][31], sintering method [-32-35] and grain size of the final ceramics [35][36][37][38]. Hu et al studied the relationship between sample grain size and fracture toughness from mechanics point of view [39,40].…”

“…Hu et al studied the relationship between sample grain size and fracture toughness from mechanics point of view [39,40]. Using the traditional sintering methods, it is still a challenge to obtain alumina ceramics with excellent mechanical properties, if the average particle size of raw material is greater than 10 μm [32,36]. Fillers with high aspect ratios, such as mullite whiskers and carbon nanotubes, are often used to enhance the mechanical properties of alumina ceramics, due to the effects of pulling out, breaking, and bridging [41][42][43].…”

Bioactive Glass Coated Zirconia for Dental Implants: a review

“…Zirconium, which is a transition metal [56,68] with greywhite color [69][70][71][72][73], can be used to make zirconia implant. Segments of the metal implant can be uncovered by recession of gingiva and the loss of apical bone, which this can disclose a discolored overlying gingiva [74][75][76][77]. These concerns make an opportunity to use the zirconia ceramics because they enjoy great aesthetic, biological and mechanical characteristics and they also lack electrically corrosion.…”

Statistical homogenization of polycrystal composite materials with thin interfaces using virtual element method

“…Modern composites materials are conceived to fulfil specific design requirements calling for the need of materials with increasingly high performances in terms of stiffness, strength, fracture toughness and lightness, among others. Special attention has been devoted in the last decades to advanced ceramics, namely composites with ceramic (CMC) or metal matrix (MMC) [1,2] which are gradually more used for a wide range of challenging applications, ranging from bioengineering, with the production of biocompatible ceramics for prosthesis and artificial organs [3], aerospace, defence, automotive [4] up to mechanical engineering for the production of wearing parts, seals, low weight components and fuel cells, and cutting tools with distinguished thermo-mechanical and wear properties [5]. Often ceramic composites exhibit a peculiar microstructure, characterized by polycrystals interconnected by a second-phase interphase of small thickness in comparison to the grain diameter.…”