Preparation and anisotropic properties of textured structural ceramics: A review

Abstract

Ceramics are usually composed of randomly oriented grains and intergranular phases, so their properties are the statistical average along each direction and show isotropy corresponding to the uniform microstructures. Some methods have been developed to achieve directional grain arrangement and preferred orientation growth during ceramic preparation, and then textured ceramics with anisotropic properties are obtained. Texture microstructures give particular properties to ceramics along specific directions, which can effectively expand their application fields. In this review, typical texturing techniques suitable for ceramic materials, such as hot working, magnetic alignment, and templated grain growth (TGG), are discussed. Several typical textured structural ceramics including α-Al 2 O 3 and related nacre bioinspired ceramics, Si 3 N 4 and SiAlON, h-BN, MB 2 matrix ultra-high temperature ceramics, MAX phases and their anisotropic properties are presented.

Bioinspired alumina/reduced graphene oxide fibrous monolithic ceramic and its fracture responses

“…They also present much lower density than most structural materials, and have great potential applications in aviation, aerospace, and other high‐stress, high‐temperature operating conditions . However, their strong covalent bonds also completely prevent the ductile behavior of ceramics, and this feature has become its most prominent inferiority . Their lack of plasticity makes ceramic materials unpredictable and catastrophic failure occur once they are destroyed by external stress, thereby greatly limiting their extensive applications as structural components .…”

“…1,2 However, their strong covalent bonds also completely prevent the ductile behavior of ceramics, and this feature has become its most prominent inferiority. 3,4 Their lack of plasticity makes ceramic materials unpredictable and catastrophic failure occur once they are destroyed by external stress, thereby greatly limiting their extensive applications as structural components. 5 Therefore, reducing the brittleness of ceramics and improving their ductile behavior have become crucial toward developing damage-resistant ceramics.…”

Spark plasma sintering of ultrafine WC‐10Ni‐ZrC hardmetals: Effects of adding ZrC nano‐powder

“…In recent years, there have been some interesting works focused on how to improve the rigidity and strength of WC‐Ni hardmetals . Inter alia, some scientists improved the mechanical performance of WC‐based hardmetals by developing submicrometer or even nanometer WC powders, and/or by mixing certain additives of high rigidity/strength into the WC matrix . Also, specific fast sintering techniques and/or grain growth inhibitors (GGIs) have been used to develop ultrafine hardmetals .…”

Microstructural Evolution of H-BN Matrix Composite Ceramics With Amorphous La2O3-Al2O3-SiO2 Glass Phase During Hot Pressing

“…For h-BN matrix composite ceramics, there also have been some research results which can reveal the microstructures changing mechanisms [24][25][26][27][28]. Bo Niu et al investigated the effects of raw h-BN particle size on the textured microstructures of BN-MAS (magnesium aluminosilicate) composite ceramics.…”

“…Bo Niu et al investigated the effects of raw h-BN particle size on the textured microstructures of BN-MAS (magnesium aluminosilicate) composite ceramics. With the increase of raw h-BN particle size, h-BN grains tended to orientate with the direction perpendicular to the hot pressing direction, while the densi cation effect of MAS phase on BN-MAS composite ceramics decreased with increasing raw h-BN particle size due to the uneven dispersion of MAS phase [26,29]. Delong Cai et al researched the in uence of sintering process on the BN-MAS composite ceramics.…”