液相沉淀法制备ZTA 纳米复相陶瓷

基金项目: 山东省优秀中青年科学家科研奖励基金(02BSO₄9)

详细信息

Preparation of ZTA nanoceramic composites by l iquid-phase precipitation method

1.
School of Materials Science and Engineering| Jinan University| Jinan 250022| China |
2.
Department ofCivil Engineering and Architecture| Shandong Urban Const ruction Vocational College| J inan 250014| China

摘要

摘要: 以NH₄Al(SO₄ )₂·12H₂O , ZrOCl₂·8H₂O , Y(NO₃ ) 3为母盐, 用NH4 HCO₃作沉淀剂, 控制滴定速度小于5 mL/ min , 采用液相沉淀法制备了纳米3 Y-ZrO₂ / Al₂O₃前驱体。分析了添加籽晶和煅烧温度对粉体性能的影响。在1000 ℃煅烧得到了分散性良好, 平均粒径为10 nm , 两相分布均匀的纳米复合粉体, XRD 分析显示前驱体在煅烧过程中无中间相γ-Al₂O₃ 和θ-Al₂O₃生成, 粉体具有较高的烧结活性, 在1550 ℃烧结3 h 后烧结体致密度达到98. 6 % , 断裂韧性可达7. 68 MPa·m^1/2 。
- ZTA /
- 纳米粉体 /
- 液相沉淀
Abstract: Using the pure NH₄Al(SO₄ )₂·12H₂O , ZrOCl₂ ·8H₂O and Y(NO₃ ) 3 as the starting materials , and theN H4 HCO₃ solution as precipitant , the ult rafine 3 Y-ZrO₂ / Al₂O₃ precursor was prepared by the liquid-phase precipitation method. The effect s of seeds and the calcination temperature on the properties of the powder were studied.The well-dispersible ZrO₂ / Al₂O₃ composite nanopowder with particles of 10 nm was obtained by calcining the precursor at 1000 ℃. The XRD patterns show noγ-Al₂O₃ andθ-Al₂O₃ form during calcination. The relative density andfracture toughness of specimen reach 98. 6 % and 7. 68 MPa·m^1/2 , respectively af ter sintering the green compact s at1550 ℃for 3 h.
- zirconium toughened alumina /
- nanopowders /
- liquid2phase precipitation