期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 27, 页码 32126-32135出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c06894
关键词
High-temperature mechanical behavior; strength; three-dimensionally ordered macroporous material; interpenetrating metal-ceramic composite; micropillar compression
资金
- MRSEC Program of the National Science Foundation [DMR-1420013]
- NSF through the MRSEC program
Metal-ceramic nanocomposites exhibit exceptional mechanical properties, with studies showing that 3DOM W-SiOC material demonstrates better plastic deformation at high temperatures.
Metal-ceramic nanocomposites exhibit exceptional mechanical properties with a combination of high strength, toughness, and hardness that are not achievable in monolithic metals or ceramics, which make them valuable for applications in fields such as the aerospace and automotive industries. In this study, interpenetrating nanocomposites of three-dimensionally ordered macroporous (3DOM) tungsten-silicon oxycarbide (W-SiOC) were prepared, and their mechanical properties were investigated. In these nanocomposites, the crystalline tungsten and amorphous silicon oxycarbide phases both form continuous and interpenetrating networks, with some discrete free carbon nanodomains. The W-SiOC material inherits the periodic structure from its 3DOM W matrix, and this periodic structure can be maintained up to 1000 degrees C. In situ SEM micropillar compression tests demonstrated that the 3DOM W-SiOC material could sustain a maximum average stress of 1.1 GPa, a factor of 22 greater than that of the 3DOM W matrix, resulting in a specific strength of 640 MPa/(Mg/m(3)) at 30 degrees C. Deformation behavior of the developed 3DOM nanocomposite in a wide temperature range (30-575 degrees C) was investigated. The deformation mode of 3DOM W-SiOC exhibited a transition from fracture-dominated deformation at low temperatures to plastic deformation above 425 degrees C.
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