Formation of zirconium diboride (ZrB2) by room temperature mechanochemical reaction between ZrO2, B2O3 and Mg
Formation of zirconium diboride (ZrB2) by room temperature mechanochemical reaction between ZrO2, B2O3 and Mg
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DOI：
10.1016/j.jallcom.2005.07.083
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发表时间：
2006-08
影响因子：
6.2
通讯作者：
N. Setoudeh;N. Welham
中科院分区：
文献类型：
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作者：
N. Setoudeh;N. Welham
将镁、氧化硼和二氧化锆的混合物在实验室规模的球磨机中在氩气下机械研磨长达15小时。X射线衍射分析表明，随着球磨时间的延长，ZrO2向ZrB2的转化率逐渐增加，15h后的转化率>98%。差热分析表明，有多个，重叠的反应，所有这些似乎是形成ZrB2。随着球磨时间的延长，样品的热分解能量逐渐降低，球磨15h后样品没有发生热反应。球磨后，通过温和的酸浸可以很容易地从副产物MgO中分离出ZrB_2，得到基本上纯的ZrB_2，其晶粒尺寸为约75nm。
A mixture of magnesium, boric oxide and zirconium dioxide were mechanically milled under argon for up to 15h in a laboratory scale ball mill. X-ray diffraction showed that there was an increasing conversion of ZrO2to ZrB2with milling time with >98% reaction after 15h. Differential thermal analysis revealed there were multiple, overlapping reactions all of which seemed to be formation of ZrB2. The energy evolved decreased with milling time and the sample after 15h milling showed no thermal reaction. After milling, separation of the ZrB2from the coproduct MgO was easily achieved by a mild acid leaching leaving essentially pure ZrB2with a crystallite size of ∼75nm.