Effects of the Diluent Content on Microstructure of Submicron ZrB2 by Combustion Synthesis

doi:10.3724/SP.J.1077.2014.13147

Abstract

Abstract: Submicron ZrB₂ powders were prepared by combustion synthesis using NaCl as the diluent and B₂O₃, Mg and ZrO₂ as raw materials. The samples were analyzed by SEM, EDS, XRD and particle size analyzer. The results show that adiabatic temperature of the system decreases with the diluent content increase. The products are aggregates which contain a small amount of larger-sized particles and a large number of small-sized particles. The average particle size of products drops from 305 nm to 160 nm as the value of k, i.e. molar ratio of the diluent, increases from 0.5 to 1.5. The products after leaching mainly consist of ZrB₂ and ZrO₂, and the content of the latter decreases with the increase of k. NaCl plays very important roles, such as providing a liquid medium, promoting the mass transfer, improving the purity of the products, and reducing the combustion temperature of the system, inhibiting growth of particles by giving a coating on the surface, and leading to small-sized particles.

Key words: NaCl diluent, combustion synthesis, ZrB₂, submicron powders

CLC Number:

TQ174

LA Pei-Qing, HAN Shao-Bo, LU Xue-Feng, WEI Yu-Peng. Effects of the Diluent Content on Microstructure of Submicron ZrB₂ by Combustion Synthesis[J]. Journal of Inorganic Materials, 2014, 29(2): 191-196.

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Effects of the Diluent Content on Microstructure of Submicron ZrB₂ by Combustion Synthesis

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