Solid-state processing of oxidation-resistant molybdenum borosilicide composites for ultra-high-temperature applications

被引:9
作者
Cook, Bruce A. [1 ]
Bonino, Christopher A. [2 ]
Trainham, James A. [2 ]
机构
[1] RTI Int, Elect & Appl Phys Div, Durham, NC 27709 USA
[2] RTI Int, Res Triangle Solar Fuels Inst, Durham, NC 27709 USA
关键词
SILICIDE-BASED COMPOSITES; PROOF-OF-CONCEPT; THIN-FILMS; STRUCTURAL APPLICATIONS; ELEVATED-TEMPERATURES; COATINGS; ALLOYS; NB; MICROSTRUCTURE; DEPOSITION;
D O I
10.1007/s10853-014-8485-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The high-temperature capabilities of multi-phase composites based on Mo5Si3Bx are examined after solid-state processing and pulsed laser deposition (PLD) coating fabrication approaches. These composites are prepared by mechanical alloying of elemental powders and densified by vacuum hot pressing, which is a scalable processing approach. Chemical analyses of the hot-pressed compacts reveal a consistent 15-22 percent loss of boron, which is primarily due to the high-temperature hot-pressing step. Composites possessing sufficient amounts of boron are evaluated by thermogravimetric studies in temperatures up to 1650 A degrees C in air. One composition demonstrates oxidative stability after long-term (100 h) isothermal conditions, as well as thermal cycling to simulate solar-thermal operation. Hot-pressed samples of composites consisting of Mo5Si3Bx + MoSi2 + MoB are also employed as deposition targets for PLD trials. X-ray diffraction analysis of the resulting films indicates the absence of long-range crystallographic order.
引用
收藏
页码:7750 / 7759
页数:10
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