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A thermo-chemical surface treatment of AlN powder for the aqueous processing of AlN ceramics

机译：AlN粉末的热化学表面处理，用于AlN陶瓷的水处理

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摘要

Dense aluminum nitride ceramics were prepared by sintering green bodies at 1750 deg C for 2 h. These green bodies were prepared by aqueous slip-casting from a powder that was surface-treated to prevent hydrolysis. The surface treatment of the aluminum nitride (AlN) powder consisted of dispersing the powder in warm-water solutions of aluminum dihydrogenphosphate Al(H_2PO_4)_3. Different treatment temperatures in the range 30-80 deg C were tested. For all the tested temperatures, the surface-treated AlN powder was found to be water-resistant, even after drying and/or redispersion. Various commercial dispersants were tested for their effectiveness, and the amount of dispersant was optimized in terms of a high solids loading of the suspension and an acceptable viscosity for slip casting. Based on these studies, a stable aqueous suspension of AlN powder, treated at 60 deg C, with a total solids loading of 50 vol percent, was prepared using CaF_2 as a sintering additive. The well-dispersed powder made it possible to prepare green samples with close particle packing and relatively high sintered densities; that is, more than 96 percent of the theoretical density.
机译：通过在1750摄氏度下烧结生坯2小时来制备致密的氮化铝陶瓷。这些生坯是通过水滑铸法从表面处理以防止水解的粉末中制备的。氮化铝（AlN）粉末的表面处理包括将粉末分散在磷酸二氢铝Al（H_2PO_4）_3的温水溶液中。测试了30-80摄氏度范围内的不同处理温度。对于所有测试温度，即使在干燥和/或再分散之后，也发现表面处理的AlN粉末是耐水的。测试了各种市售分散剂的有效性，并根据悬浮液的高固体负载量和适用于粉浆浇铸的粘度对分散剂的量进行了优化。基于这些研究，使用CaF_2作为烧结添加剂，制备了在60℃处理，总固形分含量为50体积％的稳定的AlN粉末水悬浮液。分散良好的粉末可以制备颗粒紧密堆积且烧结密度相对较高的生坯样品。也就是说，超过理论密度的96％。

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  • 来源
    《Journal of Materials Research》 |2004年第3期|p.746-751|共6页
  • 作者

    S.M. Olhero; S. Novak; M. Oliveira;

  • 作者单位

    Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;

  • 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;
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