Ni/ZrO_2复合材料力学及介电性能研究  

Mechanical and Microwave Dielectric Properties of Ni/ZrO_2 Composite

作　　者：李鹏[1] 周万城[1] 李玉琴[1] 徐洁[1] 罗发[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2008年第11期1934-1937,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50572090)资助

摘　　要：采用热压烧结方法,以氧化钇部分稳定氧化锆(Y-PSZ)粉体及不同粒径的金属Ni为原料,制备了Ni/ZrO2复合材料,研究了其力学和介电性能,探讨了烧结过程中Ni形貌的变化对复合材料介电性能的影响。结果表明,随不同粒径Ni粉的掺入,复合材料的抗弯强度减小,且较大粒径的Ni使材料抗弯强度减小更快。随Ni含量增加,复合材料断裂韧性增强。复合材料的介电常数和损耗与Ni粉含量和粒径有关。Ni含量相同时,较大粒径Ni粉的掺入使复合材料具有较高的介电常数和损耗,这是由于在烧结过程中Ni粉形貌发生变化引起的。Ni/ZrO2 composites were prepared by hot pressing using yttria partially stabilized zirconia （Y-PSZ） powder and Ni powder in different particle size as starting materials. The mechanical and microwave dielectric properties of the composites were studied. Dielectric property changes caused by morphology changes of Ni during sintering process were also discussed in detail.. Flexural strength of the composites decreases when Ni powder is added, and larger particle size of Ni deteriorates the flexural strength remarkable. By increasing the amount of Ni in the composite, the fracture toughness of the composites increased. Dielectric constant and loss of composites depends on the content and particle size of Ni powder, which the larger particle size of Ni powder in the same content can improve the dielectric constant and loss of the composites obviously. This amelioration is ascribed to the morphology change of Ni particle during sintering process.

关 键 词：Ni/ZrO2复合材料 介电常数 损耗 

分 类 号：TB33[一般工业技术—材料科学与工程]