Abstract
Abstract To develop more reliable solar thermal absorbing materials, MgAl 2 O 4 -Si 3 N 4 ceramics were in-situ synthesized via pressureless sintering method. The effects of Sm 2 O 3 on the phase composition, microstructure, densification, thermal shock resistance, oxidation resistance and solar absorptance were investigated. Results show that Sm 2 O 3 cannot only facilitate the densification for the composites via liquid phase sintering mechanism but also improve all above properties. After sintered at 1620 °C, bending strength and solar absorptance of the composite with 1 wt% Sm 2 O 3 were 339.4 MPa and 92.0%. No damage was found after thermal shock, and the bending strength experienced an improvement of 2.6%, which could be attributed to the well-grown grains and formation of glass phase. A dense oxide layer was found on the surface after oxidation at 1300 °C, which protected the sample from being oxidized. The oxidation kinetics of the composites transformed from passivation into activation when the Sm 2 O 3 content exceeded 2 wt%. These MgAl 2 O 4 -Si 3 N 4 composites should be a promising candidate for solar thermal absorbing material.
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