Improved densification by nano-sized sintering aids for Si3N4

被引:13
作者
Wang, LW
Sigmund, WM
Roy, S
Aldinger, F
机构
[1] Max Planck Inst Met Forsch, D-70569 Stuttgart, Germany
[2] Univ Stuttgart, Inst Nichtmet Anorgan Mat, Pulvermet Lab, D-70569 Stuttgart, Germany
关键词
D O I
10.1557/JMR.1999.0618
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The densification of Si3N4 with nano-sized sintering aids that were in situ incorporated by a combustion process was studied in comparison with that of sintering aids mixed by ball milling. The combustion process directly produces amorphous and nano-sized Y-Al oxides within the Si3N4 powder. X-ray diffraction results indicate that amorphous Y-Al oxides begin to crystallize into Y3Al5O12 at about 600 degrees C. Additionally the nano-sized sintering aids are more homogeneously distributed and thereby promote the formation of eutectic melts at lower temperatures during liquid-phase sintering. Therefore, the densification process of Si3N4 during liquid-phase sintering is strongly accelerated. The microstructure of as-sintered parts from combusted powder seems more dense and homogeneous.
引用
收藏
页码:4562 / 4569
页数:8
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