Low-Temperature Synthesis of Ultra-High-Temperature Coatings of ZrB2 Using Reactive Multilayers

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We demonstrate a route to synthesize ultra-high-temperature ceramic coatings of ZrB2 at temperatures below 1300 K using Zr/B reactive multilayers. Highly textured crystalline ZrB2 is formed at modest temperatures because of the absence of any oxide at the interface between Zr and B and the very short diffusion distance that is inherent to the multilayer geometry. The kinetics of the ZrB2 formation reaction is analyzed using high-temperature scanning nanocalorimetry, and the microstructural evolution of the multilayer is revealed using transmission electron microscopy. We show that the Zr/B reaction proceeds in two stages: (1) interdiffusion between the nanocrystalline Zr and the amorphous B layers, forming an amorphous Zr/B alloy, and (2) crystallization of the amorphous alloy to form ZrB2. Scanning nanocalorimetry measurements performed at heating rates ranging from 3100 to 10000 K/s allow determination of the kinetic parameters of the multilayer reaction, yielding activation energies of 0.47 and 2.4 eV for Zr/B interdiffusion and ZrB2 crystallization, respectively.
Publisher
AMER CHEMICAL SOC
Issue Date
2014-09
Language
English
Article Type
Article
Keywords

DIFFERENTIAL SCANNING CALORIMETRY; SOLID-STATE AMORPHIZATION; THIN-FILM REACTIONS; ZIRCONIUM DIBORIDE; PARTICLE-SIZE; DENSIFICATION; CERAMICS; NUCLEATION; NANOSCALE; COMPOSITE

Citation

JOURNAL OF PHYSICAL CHEMISTRY C, v.118, no.36, pp.21192 - 21198

ISSN
1932-7447
DOI
10.1021/jp505941g
URI
http://hdl.handle.net/10203/240179
Appears in Collection
ME-Journal Papers(저널논문)
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