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Colloidal processing, surface characterization, and sintering of nano ZrO_2 powders

机译：纳米ZrO_2粉末的胶体加工，表面表征和烧结

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摘要

Colloidally stable suspensions are required to fabricate dense samples with uniform microstructure by colloidal processing methods, which necessitate dispersion of ceramic powders in a liquid medium. Aqueous nano ZrO_2 suspensions were prepared using polyethylenimine (PEI) as a dispersant. PEI adsorption on nano ZrO_2 surfaces was promoted with increasing initial PEI content and suspension pH. Isoelectric point was shifted from pH 7 at 0 wt percent PEI to pH 10.4 at 3 wt percent PEI. Stable suspensions had mean particle sizes in the range of 100 to 150 nm and sedimentation rates less than 0.4 mm/h, as compared to 2-5.5 mu m and 10-50 mm/h for unstable suspensions. Samples with 98 percent relative density were fabricated after sintering at 1300 deg C for 4 h from colloidally stable suspensions.
机译：需要胶体稳定的悬浮液以通过胶体加工方法制造具有均匀微观结构的致密样品，这需要将陶瓷粉末分散在液体介质中。使用聚乙烯亚胺（PEI）作为分散剂制备纳米ZrO_2水悬浮液。随着初始PEI含量和悬浮液pH值的增加，PEI在纳米ZrO_2表面的吸附得以促进。等电点从PEI为0 wt％的pH 7变为PEI为3 wt％的pH 10.4。稳定的悬浮液的平均粒径在100至150 nm范围内，沉降速率小于0.4 mm / h，而不稳定的悬浮液则为2-5.5μm和10-50 mm / h。在1300摄氏度下从胶体稳定的悬浮液中烧结4小时后，制成相对密度为98％的样品。

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  • 来源
    《Journal of Materials Research》 |2005年第5期|p.1348-1355|共8页
  • 作者

    Cihangir Duran; Yu Jia; Yuji Hotta;

  • 作者单位

    National Institute of Advanced Industrial Science and Technology, Advanced Sintering Technology Group, Advanced Manufacturing Research Institute, Anagahora 2266-98, Shimoshidami, Moriyama-ku, Nagoya, 463-8560, Japan;

    and Gebze Institute of Technology;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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