Synthesis of ZrB2–SiC composite powders by sol–gel method using acetic acid as chemical modifier
Synthesis of ZrB2–SiC composite powders by sol–gel method using acetic acid as chemical modifier
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DOI：
10.1016/j.jtice.2014.09.022
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发表时间：
2015
影响因子：
5.7
通讯作者：
Yun Zhang;Yue Zhang;Ruixing Li;S. Yin;Tsugio Sato;Jun-ping Li
中科院分区：
文献类型：
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作者：
Yun Zhang;Yue Zhang;Ruixing Li;S. Yin;Tsugio Sato;Jun-ping Li
已知ZrB 2-SiC陶瓷具有比单块ZrB 2更好的性能。因此，SiC的加入可以改善ZrB 2的力学性能和烧结行为。本文以正丙醇锆（Zr（OPr）4）、硼酸（H3 BO 3）、蔗糖（C12 H22 O 11）、正硅酸乙酯（TEOS）和乙酸（AcOH）为原料，采用溶胶-凝胶法制备了ZrB 2-SiC复合粉体。显然，在反应的最开始，它是一个非水溶液体系。在这里，AcOH被用作化学改性剂和溶剂来控制Zr（OPr）4水解。实际上，AcOH可以主导化学推进剂自生水的水解，而不是外部水的帮助。选择C12 H22 O 11是因为它可以完全分解成碳。因此，碳可以精确地解释碳热还原反应。显微照片显示ZrB 2-SiC复合颗粒呈球形，粒径分布均匀。
ZrB2–SiC ceramics are known to have better performance than monolithic ZrB2. Therefore, the addition of SiC can improve the mechanical properties and sintering behavior of ZrB2. In the present work, ZrB2–SiC composite powders were synthesized by sol–gel method using zirconiumn-propoxide (Zr(OPr)4), boric acid (H3BO3), sucrose (C12H22O11), TEOS, and acetic acid (AcOH). Clearly, it was a non-aqueous solution system at the very beginning of the reactions. Here, AcOH was used as both chemical modifier and solvent to control Zr(OPr)4hydrolysis. Actually, AcOH could dominate the hydrolysis by self-produced water of the chemical propulsion, rather than the help of outer water. C12H22O11was selected since it can be completely decomposed to carbon. Thus, carbon might be accounted precisely for the carbothermal reduction reaction. Moreover, the photomicrograph revealed a spherical morphology of ZrB2–SiC composite particles with an uniform size distribution.