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Synthesis and Characterization of a Boron-Containing Precursor for ZrB2 Ceramic
X. Y. Tao1, Z. Xiang1, S. Zhou1, Y. Zhu1, W. Qiu2, T. Zhao2
1 School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China
2 Laboratory of Advanced Polymer Materials, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
received August 4, 2015, received in revised form September 6, 2015, accepted September 28, 2015
Vol. 7, No. 1, Pages 107-112 DOI: 10.4416/JCST2015-00041
Abstract
A precursor for ZrB2 ceramic was successfully synthesized in a chemical reaction between polyzirconoxanesal (PZS) and boric acid. The molecular structure of the precursor, thermal properties and the pyrolysis behavior of the precursor were investigated. The results showed that the as-synthesized precursor was a polymer based on Zr-O-C-B bonds. The precursor was stable in air atmosphere and soluble in common organic solvents. The ceramic yield of the precursor at 1200 °C was around 65.5 % under N2 atmosphere. The derived ceramics obtained at 1200 °C were composed of B2O3, ZrO2 and carbon. When the temperature was increased up to 1300 °C, peaks of ZrC emerged owing to carbothermal reduction. m-ZrO2 and t-ZrO2 disappeared when the pyrolysis temperature was increased to above 1400 °C. ZrB2 became the predominant phase when the pyrolysis temperature was increased up to 1500 °C.
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Keywords
Zirconium diboride, preceramic polymers, boric acid, precursor infiltration pyrolysis
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