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采用溶胶–凝胶法制备了BaTiO3溶胶,并在BaTiO3纳米粉体表面原位包覆一层均匀的同质溶胶。表征了包覆的BaTiO3纳米粉体的性能,研究了包覆量和烧结温度对包覆样品相对密度的影响。结果表明:在BaTiO3纳米粉体表面原位包覆了一层5～6nm厚的同质均匀溶胶。包覆量为BaTiO3粉体质量的3.0%时包覆效果最佳;1260℃烧结的包覆粉体样品,较未包裹的BaTiO3粉体具有更高的相对密度,前者为96.48%,而后者仅为75.40%。包覆粉烧结体断面致密,而原始粉烧结体断面则有明显气孔。
BaTiO3 sol was prepared by sol-gel method and a homogeneous homogeneous sol was coated on the surface of BaTiO3 nanoparticle. The properties of the coated BaTiO3 nanopowders were characterized. The effects of the coating amount and the sintering temperature on the relative density of the coated samples were investigated. The results show that BaTiO3 nanopowder is coated in situ with homogeneous homogeneous sol of 5 ~ 6nm thickness. When the coating amount is 3.0% of BaTiO3 powder, the coating effect is the best. The coated powder sample sintered at 1260 ℃ has a higher relative density than the uncoated BaTiO3 powder, the former is 96.48%, while the latter only 75.40%. The coated powder sintered compact section, while the original powder sintered section has obvious pores.