Reactive hot pressing of zirconium diboride
Reactive hot pressing of zirconium diboride
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DOI：
10.1016/j.jeurceramsoc.2009.07.006
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发表时间：
2009-12
影响因子：
5.7
通讯作者：
A. L. Chamberlain;W. Fahrenholtz;G. Hilmas
中科院分区：
文献类型：
--
作者：
A. L. Chamberlain;W. Fahrenholtz;G. Hilmas
研究了锆和硼的反应是形成致密的块状二硼化锆陶瓷的一种潜在途径。前驱体的研磨得到了纳米级(小于100 nm)的金属锆粉，在600℃下与硼反应生成了平均粒径小于100 nm的ZrB2。加热到1450°C和1650°C的ZrB2压坯的扫描电子显微镜显示，平均粒径分别为0.6μm和1.0μm，表明在致密化过程中保持了细小的颗粒尺寸。采用2100℃热压工艺制备了相对密度为∼99%的陶瓷，用反应热压工艺制备的致密陶瓷具有与传统工艺相当的力学性能。本研究制备的ZrB2的四点弯曲强度为434 Mpa。
The reaction of zirconium and boron was investigated as a potential route to form dense monolithic zirconium diboride (ZrB2) ceramics. Attrition milling of the precursors produced nanosized (less than 100nm) zirconium metal particles that reacted with boron to form ZrB2with an average particle size of less than 100nm at temperatures as low as 600°C. Scanning electron microscopy of ZrB2compacts heated to 1450°C and 1650°C showed average particle sizes of 0.6μm and 1.0μm, respectively, suggesting that the fine particle size was maintained during densification. Ceramics with a relative density of ∼99% were produced by hot pressing at 2100°C. Dense ZrB2produced by the reactive hot pressing process had mechanical properties that were comparable to ceramics produced by conventional processes. The four-point flexure strength of ZrB2produced in this study was 434MPa.