球磨时间和烧结工艺对Al2O3/B4C芯块致密性的影响
Effect of Milling Time and Sintering Techniques on Compactness of Al2O3/B4C Pellets
摘 要
对比无压烧结和热压烧结制备的Al2O3/B4C芯块, 研究了烧结温度、粉体球磨时间对其开孔率和密度的影响; 通过扫描电镜和X射线衍射仪分析了Al2O3/B4C芯块结构、形貌和相态。结果表明: 球磨4 h有利于芯块的烧结, 并且热压烧结的芯块性能明显优于无压烧结的, 适宜的烧结温度为1 550~1 650 ℃, 过低或过高都会降低芯块的致密性, 在1 600 ℃热压烧结芯块的性能最好, 其相对密度和开孔率达到96.41%和0.08%; 热压烧结能促进芯块的致密化, 可获得细小、均匀的显微组织, 其致密化温度比无压烧结降低100℃以上。
热压烧结
开孔率
密度
Al2O3/B4C pellet
hot-press sintering
open porosity
density
Abstract
Al2O3/B4C pellets sintered by hot-press were compared with those by pressureless, and the effects of sintering temperature and milling time on open porosity and density of the pellets were investigated. The microstructure, surface morphology and phase state were investigated by SEM and XRD. The results show that the powders milled for 4 h were beneficial to sintering. The pellets sintered by hot pressing were much better than those by pressureless sintering. The suitable temperature for sintering was in the range of 1 550-1 650 ℃, and the pellets′ density decreased if the temperature was higher or lower. The best relative density and open porosity of Al2O3/B4C pellets hot pressed at 1 600 ℃ were 96.41% and 0.08%, respectively. Hot pressed Al2O3/B4C pellets got densified quickly, that the densification temperature was lower above 100 ℃ than the pressureless sintered one, and the microstructure was fine and uniform.
中图分类号 TG146.1
所属栏目
基金项目 国防预研基金资助项目(9140C0050707C7003)
收稿日期 2010/7/22
修改稿日期 2011/7/17
网络出版日期
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备注吕延会(1963-), 男, 河南南阳人, 副教授, 学士。
引用该论文: LV Yan-hui,HUANG Hua-wei,WANG Xiao-min,YANG Jing,XU Kui. Effect of Milling Time and Sintering Techniques on Compactness of Al2O3/B4C Pellets[J]. Materials for mechancial engineering, 2011, 35(9): 89～92
吕延会,黄华伟,王晓敏,杨静,许奎. 球磨时间和烧结工艺对Al2O3/B4C芯块致密性的影响[J]. 机械工程材料, 2011, 35(9): 89～92
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参考文献
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【3】SANDERS C E, WAGNER J C, ORN L.Study of the effect of integral burnable absorbers for PWR burn up credit[M]. Washington DC: Office of Nuclear Regulatory Research, 2003.
【4】ALLEN K. Advanced polymemeric burnable poison rod assemblies for pressurized water reactors[D]. Florida: University of Florida,2003.
【5】PRESSLEY L M, RICKNER J, TULENKO J. An innovative spectral shift burnable poison rod assembly design[M]. New York: ANS Transactions, 2000.
【6】ONOUE M, KAWANISHI T, CARLSON W R. Application of MSHIM core control strategy for Westinghouse AP1000 nuclear power plant[M]. Monroeville:[s.n.],2003.
【7】JO C K, KIM Y, JAE M N. Burnable poison for reactivity management in a very high temperature reactor[J]. Annals of Nuclear Energy, 2009(36):298-304.
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【9】黄栋亚, 吴义成.Al2O3-B4C弥散陶瓷芯块烧结行为[J].中南矿冶学院学报, 1989, 20(1): 59-65
【10】LIU Yong-he, YIN Sheng, ZHANG Wei-jing. Thermodynamic analysis of the self-propagation high-temperature synthesis Al2O3/B4C composition[J]. Scripta Materialia,1998,39(9):1237-1242.
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