Oscillatory pressure-assisted sinter forging for preparation of high-performance SiC whisker reinforced Al₂O₃composites

Abstract

In this work, a novel process, oscillatory pressure-assisted sinter forging (OPSF), for the preparation of high-performance ceramic composites was reported. Compared with the samples made by conventional sinter forging (SF) and hot oscillatory pressing (HOP), the SiC whisker reinforced Al 2 O 3 composites (SiC w -Al 2 O 3 ) prepared by OPSF at the same temperature exhibited a higher density and significantly improved the mechanical properties. The improvements in densification and performance are attributed to simultaneous enhanced shear deformation at both macro-and micro-scales, resulting from the combination of die-free configuration and oscillatory pressure of OPSF. And the strength of grain boundary is greatly increased when the temperature reaches 1600 ℃ of OPSF, due to that the grain-boundary sliding became pronounced at higher temperatures. The current results shed light on a powerful technique for preparing ceramic composites, which is likely applicable to other systems.

Ultrafast high-temperature sintering of high-entropy oxides with refined microstructure and superior lithium-ion storage performance

“…The sintering phenomenon is widely acknowledged to involve a dynamic interplay between two opposing mechanisms, namely coarsening and densification [41]. Specifically, at lower temperatures, the coarsening is principally driven by the prevalence of surface diffusion.…”

The enhanced mechanical properties of SiC nanowires/Ba 0.75Sr 0.25Al 2Si 2O 8 ceramics with embedded SiO 2 interface

“…The introduction of reinforcements is an effective approach to improve the strength and toughness of ceramics [11][12][13][14]. Typical reinforcements include zerodimensional (0D) ceramic particles (e.g., SiC particles and Si3N4 particles) [15,16], one-dimensional (1D) nanotubes (e.g., carbon nanotubes and BN nanotubes) [17,18], nanowires (e.g., carbon nanowires and SiC nanowires (SiCnws)) [19][20][21], twodimensional (2D) (e.g., graphene and BN nanosheets [22][23][24]).…”