采用BaCO3和TiO2为原料粉体,经机械球磨后直接成型烧结,可以在1340℃/4h的条件下获得密度达4.49g/cm3的单相Ba2Ti9O20材料.进一步的研究表明,采用高能球磨可以大大降低反应烧结的温度,在1250℃/4h的条件下可获得密度达4.44 g/cm3的单相Ba2Ti9O20材料.高能球磨所获得的粉体颗粒细小、均匀是反应烧结温度低的主要原因.本研究还分析了烧结过程中材料的相组成的变化过程.
The preparation of Ba2Ti9O20 materials via react-sintering process was investigated. BaCO3 and TiO2
were used as raw materials, after mechanical milling, the mixed powders were pressed into pellets and sintered directly. The reacting mechanism during
sintering process was also investigated.Single phase Ba2Ti9O20 materials with a high density of about 4.49 can be obtained after sintering
at 1340℃ for 4h. More investigations show that the sintering temperature can be obviously lowered by using high-energy milling process
instead of common mechanical milling process. Single phase Ba2Ti9O20 materials with a high density of about 4.44 can be obtained under 1250℃/4h
conditions. Smaller particles and homogeneous distribution of the high-energy milling powders are the main reason for their low sintering temperatures.
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