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首页> 美国政府科技报告 >Reactive Synthesis and Characterization of MoSi2/SiC Using Low Pressure PlasmaDeposition and 100% Methane
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Reactive Synthesis and Characterization of MoSi2/SiC Using Low Pressure PlasmaDeposition and 100% Methane

机译：低压等离子体沉积和100％甲烷反应合成mosi2 / siC及其表征

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LPPD of MoSi2 using 100% methane as a reactive powder carrier yielded a materialwith approximately 6 vol.% SiC, approximately 6 vol.% SiO2 and approximately 13 vol.% Mo5Si3 and Mo5Si3C. The SiC phase formed during reactive spraying was cubic (beta-SiC) and exhibited a particulate morphology. The majority of the SIC particles were submicron in size and tended to be located at prior droplet boundaries. The SiO2 phase was along prior droplet boundaries. The Mo5Si3 and Mo5Si3 phases were dispersed as particles within a MoSi2 lamella. In addition, a substantial amount of elemental carbon was observed in the as sprayed material. The volume fraction of SiC observed in the reactive plasma-sprayed MoSi2 is higher than that typically obtained using blended powders or co-injection. Annealing of the as-sprayed material increased the amount of SiC to approximately 8 vol.% and decreased the amount of SiO2 and elemental carbon. The room temperature fracture toughness of the as sprayed material was approximately 7 MPa m(1/2). Annealing caused the fracture toughness to increase an the order of approximately 10 MPa m(1/2). This value is higher than that typically obtained for MoSi2/SiC composites processed by PM, XDTM, or SHS. Future work will investigate the mechanism responsible for the high fracture toughness values of these materials. jg p1.

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