Preparation and mechanical properties of Al2O3/Al laminated ceramic matrix composites

Abstract

Three series of Al 2 O 3 /Al laminated ceramic matrix composites, named SPA, SPV and HP, were fabricated by different methods. SPA and SPV were prepared using Al 2 O 3 slices and Al slurry via screen printing and subsequent heat treatment in air or vacuum. HP samples were made by hot pressing the layered stack of Al foils and Al 2 O 3 slices . SEM and XRD were applied to analyze the microstructure and the interlayer crystal phase. The bending strength, fracture toughness and fracture work of the samples made by the three methods were measured and compared. The results show that the composites have much better toughness and higher fracture work than the Al 2 O 3 slice. Among the samples made by the three methods, the samples made by hot pressing have the optimum mechanical performance. The displacement-load curves and fracture mechanism were analyzed.

Improved ablation resistance and thermal insulation performances of polyimide composites by introducing albite/glass powder composition

“…This strategy is to add a ceramic precursor to the resin to reduce the carbon loss of the resin in two ways: (1) the ceramization reaction of ceramic precursor and the activated carbon produced by the decomposition of the resin at high temperature can fix carbon atoms; (2) the ceramic structure formed at high temperature can prevent the activated carbon generated by the decomposition of the resin from contacting air, thereby reducing the carbon loss. In 2012, Huang and co-workers 17,18 used aluminosilicate ceramic precursors as fillers and achieved the preparation of carbon-based ceramic composites with a high char yields for the first time through the ceramization-carbon fixation strategy. Subsequently, Chen group 19,20 and Shi group, 21 respectively, used this strategy to prepare carbon/phenolic resin-based ZrB 2 composites and boron-modified phenolic resin-based MgO-Al 2 O 3 -SiO 2 composites with high char yields.…”