摘要
通过共沉淀法制备La2O3掺杂Al_2O_3纳米粉,粉体经压制后分别采用微波和真空烧结制备Al_2O_3透明陶瓷。结果表明：Al_2O_3粉末颗粒大小均匀,近似球形,为40~60nm;两种烧结方式制备的试样XRD图中均为α-Al_2O_3,未检测到其它相。La2O3掺杂量为1%时,随烧结温度升高,两种烧结方法得到的Al_2O_3陶瓷的相对密度和抗弯强度均呈上升趋势,且微波烧结陶瓷的相对密度和抗弯强度明显高于真空烧结。1500℃烧结时,随La2O3掺杂量的增加,Al_2O_3陶瓷的相对密度均先增大后减小,当La2O3掺杂量为1%时,Al_2O_3陶瓷的相对密度和抗弯强度均最大。微波烧结陶瓷的透光率明显高于真空烧结,且其断口晶粒比真空烧结明显细少。
The La2O3-doped Al2O3 nanocrystalline powders were prepared by co-precipitation method. After compression moulding, the Al2O3 ceramics were prepared by microwave sintering or vacuum sintering, respectively. The results show that the Al2O3 nanoparticles are homogeneous in size and nearly spherical, the particle size is about 40-60 nm The phase structure of the samples with the two sintering methods are a-Al2O3 without other phases. The relative density and bending strength of the Al2O3 ceramics with the two sintering method all increase with the sinte- ring temperature rising, the relative density and bending strength by microwave sintering is higher than vacuum sintering, when sintering at 1500 ℃, the relative density and bending strength of the Al2O3 ceramics increase firstly and then derease with the rising of the doped La2O3 content, when the doped La2O3 content is 10%, the relative density and bending strength of the Al2O3 ceramics reach the biggest, the transmittance of the Al2 O3 ceramics by microwave sintering is higher obviously than vacuum sintering, and the fracture grain is so as the transmittance.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2016年第8期65-68,共4页
Materials Reports
基金
国家自然科学基金(51362022)
江西省教育厅科研项目(GJJ13500)
工信部稀土专项项目(工信部原2014
30号)
江西省自然科学基金重大项目(20152ACB20013)
关键词
共沉淀法
Al2O3透明陶瓷
LA2O3
微波烧结
真空烧结
chemical coprecipitation, Al2O3 transparent ceramic, La2O3, microwave sintering, vacuum sintering
