添加Y_2O_3的ZrO_2-Al_2O_3复相陶瓷力学性能的研究  

Mechanical Property of (Y_2O_3)ZrO_2-Al_2O_3 Ceramic Composites

作　　者：王玉春[1] 丘泰[1] 沈春英[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《中国稀土学报》2003年第2期174-178,共5页Journal of the Chinese Society of Rare Earths

基　　金：江苏省高技术研究项目(BG20020225)

摘　　要：采用工业ZrO2,Al2O3原料,以Y2O3作为稳定剂,通过适当的工艺制备出ZrO2 Al2O3复相陶瓷。研究结果表明,Y2O3添加量为3.5%(摩尔分数)的ZrO2基陶瓷中加入Al2O3可有效地抑制ZrO2晶粒的生长,有利于使ZrO2晶粒以亚稳四方相存在,从而提高材料的强度与断裂韧性。Al2O3含量为20%(质量分数)时,复相陶瓷的抗弯强度、断裂韧性分别为676.7和10MPa·m1 2,其值接近湿化学法制备的复相陶瓷的力学性能。相变增韧与颗粒弥散增韧作用相互叠加提高了复相陶瓷材料的力学性能。ZrO2Al2O3 ceramic composites with Y2O3 as stabilizator were prepared from commercial ZrO2 and Al2O3 powders by means of appropriate technique. The results reveal that the grain growth of ZrO2 is inhibited by the introduction of Al2O3 in the ZrO2 matrix ceramic with 3.5% Y2O3 as stabilizator, which is in favor of leaving large amount of metastable tetragonal ZrO2 in the body and results in higher strength and toughness of ceramic. When the content of alumina is 20%, the bending strength and fracture toughness of the composites are 676.7 MPa and 10 MPa·m1/2 respectively, which are close to those of composites with ZrO2 and Al2O3 powders synthesized by wet chemical approach. The mechanical property is improved by the dispersion toughening of alumina grain and the phase transformation toughening of zirconia.

关 键 词：无机非金属材料 复相陶瓷 颗粒弥散增韧 相变增韧 力学性能 稀土 

分 类 号：TB484.5[一般工业技术—包装工程]