【摘要】 以NH4Al(SO4)2·12H2O,ZrOCl2·8H2O,Y(NO)3为原材料,用NH4HCO3作沉淀剂,控制滴定速度小于5mL/min,采用液相沉淀 法制备了超细3YZrO2/Al2O3前驱体。前驱体为分散的碱式碳酸盐,在1200℃煅烧得到了分散性良好,平均粒径为20nm的tZrO2和α Al2O3两相分布均匀的纳米复合粉体。X射线衍射分析显示:前驱体在煅烧过程中无中间相γAl2O3,θAl2O3生成。所制备的粉体具有高 的烧结活性。在1450℃烧结后烧结体相对致密度可达97.4%。更多还原

【Abstract】 Using pure NH₄Al(SO₄)₂·12H₂O,ZrOCl₂·8H₂O and Y（NO）₃ as starting materials and NH₄HCO₃ solution as precipitant agent, the ultra fine 3YZrO₂/Al₂O₃ precursor was prepared by the liquid-phase precipitation method, controlling the dripping speed below 5 mL/min. Zirconia/alumina composite nanopowder with good dispersibility and average particle size of （20 nm） was obtained by calcining the precursor at 1 200 ℃. X-ray diffiraction patterns show that no γAl₂O₃ and θAl₂O₃ were formed during calcination. The resultant powder has an excellent sinterability and the relative density of samples obtained reaches up to 97% after sintering at 1 450 ℃.更多还原