Sintering temperature depression in Al2O3 by mechanical milling
Sintering temperature depression in Al2O3 by mechanical milling
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机械铣削降低 Al2O3 的烧结温度
DOI：
10.1007/s10853-006-1031-6
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发表时间：
2007
影响因子：
4.5
通讯作者：
E. Kisi
中科院分区：
文献类型：
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作者：
H. J. Goodshaw;J. Forrester;G. Suaning;E. Kisi
高能球磨Al2O3与硬化钢研磨介质已证实，纳米晶粉末很容易形成。在球与电荷的质量比为20：1时，微晶尺寸福尔斯仅在2小时内降至30 nm以下，在4小时内降至15 nm以下。球磨后的粉末被Fe污染，Fe含量随球磨时间的增加而线性增加，16 h后达到10wt%。发现Karagedov和Lyakhov的HCl浸提过程[Karagedov和Lyakhov（1999）Nanostruct Mater 11（5）：559]除去了大部分Fe，但是用XRF分析发现了残留的Fe。研磨和浸出的样品显示出显著的烧结温度降低至约1100 °C，并且在不施加压力的情况下产生大于94%的烧结密度。球磨引起的Al2O3晶格膨胀的观察，我们认为这是由于缺陷的形成，而不是Fe的吸收。小晶粒尺寸和晶格缺陷在降低烧结温度中的各自作用进行了讨论。
High-energy milling of Al2O3with hardened steel milling media has confirmed that nanocrystalline powders are readily formed. At a ball to charge mass-ratio of 20:1, the crystallite size falls below 30 nm in just 2 h and below 15 nm in 4 h. The as-milled powders are contaminated with Fe which increases linearly with increased milling time, reaching ∼10 wt% after 16 h. The HCl leaching process of Karagedov and Lyakhov [Karagedov and Lyakhov (1999) Nanostruct Mater 11(5):559] was found to remove a large proportion of the Fe, but residual Fe was found with XRF analysis. Milled and leached samples show significant sintering temperature depression to approximately 1100 °C and produce sintered densities greater than 94% without the application of pressure. Milling induced lattice expansion of the Al2O3is observed which we posit to be due to defect formation rather than Fe absorption. The respective roles of small crystallite size and lattice defects in reducing the sintering temperature are discussed.
S.Inada：“绿色致密结构对氧化铝烧结的影响”Ceram.Int。
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