科研之友
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摘要
The densification behavior and grain growth of single-phase ZrB2 ceramics by a spark plasma sintering (SPS) process were systematically investigated. The sintering was conducted at temperatures ranging from 1800 degrees and 1950 degrees C in vacuum under a pressure of 50 MPa. The heating rate and the soaking time varied from 50 degrees to 430 degrees C/min and from 0 to 20 min, respectively. The microstructure was observed by field emission scanning electron microscopy. A near-fully dense ZrB2 ceramic can be obtained at a lower temperature, within a much shorter time, than those used in conventional hot-pressing process. The density of the sintered ceramics increases with increase in sintering temperature, heating rate, and holding time. On the other hand, microstructural examination shows a strong dependence of grain growth on sintering temperature, heating rate, and holding time. The fully dense ZrB2 ceramic with fine grain and homogeneous structure could be achieved by the processing conditions as follows: sintering temperature of 1900 degrees C, holding time of 3 min, and heating rate of 200 degrees-300 degrees C/min.
- 出版日期2008-9
