Aluminum-containing intergranular phases in hot-pressed silicon carbide

Abstract

Aluminum-containing intergranular phases, forming intergranular films and secondary phase particles at triple-junctions in SiC hot-pressed with aluminum, boron, and carbon additions, were studied by transmission electron microscopy. Statistical high-resolution electron microscopy study

Mullite Formation in Al2O3/SiO2/SiC Composites for Processing Porous Radiant Burners

“…This is suggested by the higher amorphous content of SiC-based samples 2 (Al 2 O 3 -SiO 2 -SiC) and 4 (SiC-Al 2 O 3 -SiO 2 ). Additionally, the presence of small peaks suggests formation of other minor crystalline phases from the tripe junctions of Al 2 O 3 -SiO 2 -SiC grains as recently reported in the literature [35].…”

Surface treatment effects on ceramic matrix composites: Case of a thermal sprayed alumina coating on SiC composites

“…Then, an evolution of the surface wettability as well as the interaction mode can be considered. As demonstrated by several authors, interactions between alumina and silicon carbide were detected according to the environmental temperature (to produce new arrangements of elements) [27][28][29] or to the presence of oxide layer (which can easily be imagined with thermal spraying process under atmospheric conditions) [30]. If it was not possible to detect oxide elements at the as sprayed SiC/alumina interface (CMC element being particularly stable under the temperature effect), this oxide layer has been particularly observed after thermal stresses by cyclic treatment on both materials (obtained after laser treatment or silicon bonding layer).…”

Elastic constants and tensile properties ofAl2OCby density functional calculations

“…There are several examples of this where Al 2 OC can be an interfacial phase, for example, in composites of SiC and Al 2 O 3 , 1 and most notably where SiC is sintered with Al, B, and C additives to make ABC-SiC, the toughest SiC ceramic reported to date. [2][3][4][5][6] Since the mechanical characteristics of Al 2 OC are unknown ͑the boundary films are too small, ϳ1 to 3 nm thick, for direct experimental measurement͒, it has been difficult to rationalize such unprecedented toughness levels in silicon carbides containing such intergranular Al 2 OC-type films. Accordingly, here we follow a computational route to determine elastic and ultimate strength properties of Al 2 OC, a wurtzite-type structure, and to ascertain if the properties of Al 2 OC conform to fracture mechanics expectations for the toughness of SiC ceramics.…”