摘要
利用非均相沉淀法制备了平均粒径小于50nm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。
Al_2O_3/W and Al_2O_3/Ni nano-composite powders, with mean particle sizes less than 50 nm, were prepared by the heterogeneous precipitation process using Al(NO_3)_3·9H_2O and (NH_4)_2CO_3 solutions as raw materials and tungsten and nickel nanometer powders as additive in different volume fractions (5%,10%). The α-Al_2O_3/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.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2004年第4期114-117,共4页
Acta Materiae Compositae Sinica
基金
国家杰出青年科学基金(50025103)
