Results 121 to 130 of about 286 (167)

Comminution characteristics of zirconium diboride

Soviet Powder Metallurgy and Metal Ceramics, 1972
1. The investigation into the comminution kinetics of zirconium diboride powder has demonstrated that comminution is more effective in a vibratory mill than in a ball mill. The optimum comminution time is 2–3 h. 2. Tsyurupa's analytical method of calculation can be employed for determining the particle-size distribution of powders.
L. V. D'yakonova, P. S. Kislyi
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Oxidation of zirconium diboride with niobium additions

Journal of the European Ceramic Society, 2013
Oxidation of ZrB2 ceramics containing Nb additions at 1500 ◦ C resulted in the formation of a two-layer oxide scale. The outer surface was partially covered by a glassy layer containing B2O3 with smaller amounts of Nb and Zr oxides dissolved into it. With increasing exposure time, evaporation of B2O3 from the outer layer resulted in precipitation of ...
Maryam Kazemzadeh Dehdashti, William G. Fahrenholtz, Greg E. Hilmas   +2 more
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Zirconium Diboride with High Thermal Conductivity

Journal of the American Ceramic Society, 2014
Thermal properties were characterized for zirconium diboride produced by reactive hot pressing and compared to ZrB 2 ceramics that were hot pressed from commercial powders.
Jason M. Lonergan, William G. Fahrenholtz, Greg E. Hilmas   +2 more
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Investigations into the slip behavior of zirconium diboride

Journal of Materials Research, 2016
Abstract
Brett Hunter, Xiao-Xiang Yu, Nicholas De Leon, Christopher Weinberger, William Fahrenholtz, Greg Hilmas, Mark L. Weaver, Gregory B. Thompson   +7 more
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Aqueous Tape Casting of Zirconium Diboride

Journal of the American Ceramic Society, 2009
Aqueous tape casting of ZrB 2 powder with sintering additives was investigated. The dispersion of ZrB 2 suspensions in aqueous media was studied and characterized in terms of zeta potential, sedimentation, and rheological ...
Zhihui Lü, Dongliang Jiang, Jingxian Zhang, Qingling Lin   +3 more
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Reactive hot pressing of zirconium diboride

Journal of the European Ceramic Society, 2009
Abstract The reaction of zirconium and boron was investigated as a potential route to form dense monolithic zirconium diboride (ZrB2) ceramics. Attrition milling of the precursors produced nanosized (less than 100 nm) zirconium metal particles that reacted with boron to form ZrB2 with an average particle size of less than 100 nm at temperatures as ...
Adam L. Chamberlain, William G. Fahrenholtz, Gregory E. Hilmas   +2 more
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Synthesis and consolidation of zirconium diboride: review

Advances in Applied Ceramics, 2011
AbstractAbstractZirconium diboride is a strategic material, finding applications as thermal protection system in reentry vehicles, high temperature electrode, thermowell tubes, etc. Solid state reactions require high temperature and thus result in coarse powders which are difficult to sinter.
J K Sonber, A K Suri
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Oxidation Behavior of Zirconium Diboride Nanoparticles

Inorganic Materials, 2018
The products of oxidation of ZrB2 powders with average particle sizes of ~100 and ~30 nm by atmospheric oxygen under isothermal conditions and during heating have been characterized by thermal analysis, X-ray diffraction, scanning electron microscopy, IR frustrated total internal reflection spectroscopy, energy dispersive X-ray analysis, and elemental ...
G. V. Kalinnikov, A. A. Vinokurov, S. E. Kravchenko, N. N. Dremova, S. E. Nadkhina, S. P. Shilkin   +5 more
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Nanosized zirconium diboride: Synthesis and properties

Russian Journal of Inorganic Chemistry, 2011
The thermolysis of Zr(BH4)4 vapor at 573 and 623 K in a vacuum of 1.33 × 10−1 Pa was studied. Nanosized zirconium diboride was produced as an X-ray amorphous powder and a crystalline film. According to electron microscopy data, the X-ray amorphous zirconium diboride powder obtained at 573 or 623 K consists of spherical particles 30–40 nm in diameter ...
S. E. Kravchenko, V. I. Torbov, S. P. Shilkin   +2 more
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Spark Plasma Sintering of Zirconium Diborides

Journal of the American Ceramic Society, 2008
The densification behavior and grain growth of single‐phase ZrB 2 ceramics by a spark plasma sintering (SPS) process were systematically investigated. The sintering was conducted at temperatures ranging from 1800° and 1950°C in vacuum under a pressure of 50 MPa.
GUO, Shuqi, NISHIMURA, TOSHIYUKI, KAGAWA, YUTAKA, TANAKA, HIDEHIKO   +3 more
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