非均相沉淀法制备纳米α-Al2O3/金属复合粉体

晏泓; 张猛; 赵兴国; 许并社

非均相沉淀法制备纳米α-Al₂O₃/金属复合粉体

太原理工大学材料科学与工程学院, 太原 030024

基金项目: 国家杰出青年科学基金(50025103)

详细信息

通讯作者:
许并社,教授,博士生导师,研究方向为纳米碳功能材料和纳米复合材料 E-mail:xubs@public.ty.sx.cn

中图分类号: TB383
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出版历程
- 收稿日期: 2003-06-17
- 修回日期: 2003-10-13
- 刊出日期: 2004-08-14

PREPARATION OF α-Al₂O₃/METAL NANO-COMPOSITE POWDER BY THE HETEROGENEOUS PRECIPITATION

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

摘要

摘要: 利用非均相沉淀法制备了平均粒径小于50 nm的α-Al₂O₃/W(Ni)复合粉体,并研究对比了纳米钨和镍对α-Al₂O₃相转变温度的影响。结果表明:纳米钨和镍的存在均可降低过渡型氧化铝向α型氧化铝转变的相变温度,但降低程度有所不同,含钨氧化铝于1000℃完成相变,而含镍氧化铝于1150℃完成相变;并且纳米第二相体积比越大,对相变温度的影响也越大。
- 纳米复合粉体 /
- α-Al₂O₃/W(Ni) /
- 非均相沉淀 /
- 相变温度
Abstract: Al₂O₃/W and Al₂O₃/Ni nano-composite powders, with mean particle sizes less than 50 nm, were prepared by the heterogeneous precipitation process using Al(NO₃)₃·9H₂O and (NH₄)₂CO₃ solutions as raw materials and tungsten and nickel nanometer powders as additive in different volume fractions (5%,10%). The α-Al₂O₃/W(Ni) nano-composite was obtained by calcining Al(OH)₃/W(Ni) dried gel at 1000(1150)℃ for an hour in vacuum. Adding tungsten or nickel nanometer powder can both reduce the phase transformation temperature to alpha alumina, which is lower by adding tungsten than that by adding nickel. The more secondary nanometer phase is, the lower the phase transformation temperature to alpha alumina will be. The composite powder is simply mechanically mixed together, because no new phases were observed, which is different from alumina and tungsten or nickel.
- nano-composite powder /
- α-Al₂O₃/W(Ni) /
- heterogeneous precipitation /
- phase transformation temperature