Abstract
ZrB 2 -SiC-MoSi 2 ceramic (ZSM) was successfully prepared by SPS sintering process. The micro-structure and mechanical property were characterized, the oxidation behavior of ZSM was mainly studied at 1500 °C in air. Compared to ZrB 2 -SiC ceramic (ZS), the mechanical property of ZSM was improved significantly. MoB phase increasing the mechanical and chemical bonding force between different phases was formed in ZSM during SPS sintering. After 10 h oxidation at 1500 °C in air, oxide layer thickness of ZSM was thinner than ZS, oxidation resistance of ZSM was better than ZS.
Highlights
In recent years, ZrB2-SiC ceramic have become one of the most attractive candidate materials for the thermal protection system of the generation hypersonic vehicles due to its high melting points, high strength, high thermal conductivity and relatively low density[1,2,3,4]
ZrB2-SiC-MoSi2 ceramic (ZSM) and ZrB2-SiC ceramic (ZS) were successfully prepared via spark plasma sintering (SPS) sintering process at 1900 0C and characterized
MoB phase increasing the mechanical and chemical bonding force between different phases was formed in ZSM during SPS sintering
Summary
ZrB2-SiC ceramic have become one of the most attractive candidate materials for the thermal protection system of the generation hypersonic vehicles due to its high melting points, high strength, high thermal conductivity and relatively low density[1,2,3,4]. During supersonic flight and re-entry process, ZrB2-SiC ceramic will serve in extremely harsh oxidative environment at high temperature. The oxidation behavior of ZrB2-SiC ceramic at high temperature was very important for its application. MoSi2 was found to be an effective additive to improve the sinterability and oxidation resistance of ZrB2 ceramic[14,15,16], the oxidation behavior of ZrB2-MoSi2 ceramic has been studied[17,18]. The oxidation behavior of ZrB2-SiC-MoSi2 ceramic at high temperature was rarely reported. ZrB2-SiC-MoSi2 ceramic (ZSM) was successfully prepared by spark plasma sintering (SPS), the mechanical property and oxidation behavior were characterized and compared with ZrB2-SiC ceramic (ZS) prepared at the same condition. The results could give technical support for the reliably application of ZSM in hash environment
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