期刊
POWDER TECHNOLOGY
卷 256, 期 -, 页码 522-528出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.powtec.2014.01.067
关键词
Synthesis; Sol-gel; Carbothermal reduction; Crystal morphology; ZrB2
资金
- National Science Foundation of China [NSFC51372006]
- Scientific Research Starting Foundation for Returned Overseas Chinese Scholars
- Ministry of Education
- the Start-Up Fund for High-End Returned Overseas Talents [411]
- Ministry of Human Resources and Social Security, China
- Lab-Installation Foundation of Beihang University for New Teachers
One-dimensional (1D) materials can increase mechanical properties along the long axis of the reinforcement for the composites because of the transfer of stress across the reinforcement-matrix interfaces parallel with the load. In this study, 1D hexagonal-prism-like ZrB2 particles were synthesized by a sol-gel route using zirconium n-propoxide, boric acid, acetic acid, and fructose. Fructose acted as both a modifier and a carbon source for carbothermal reduction reaction. For comparison purposes, both nascent state gel and aged gel were used to clarify the aging-time-dependent mechanism for ZrB2 synthesis. As a result, a single phase ZrB2 could only be obtained from the aged gel with the optimal ratios (by mol.) of 1.2 and 5 for both fructose and acetic acid to zirconium n-propoxide, respectively, reduced at an optimal temperature of 1550 degrees C for 2 h. Additionally, it revealed a perfect hexagonal-prism-like morphology for the ZrB2 particles with a uniform size and shape distribution, and average particle size of ca. 0.8 mu m in diameter of excircle of the hexagonal cross-section. (C) 2014 Elsevier B.V. All rights reserved.
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