制备BaTiO_3导电粉体的稀土扩渗技术与装置  

Rare-earth Diffusion Technology and Equipment for Preparing BaTiO_3 Conductive Powder

作　　者：崔晓海[1] CUI Xiaohai(Heilongjiang Mechanic Science Institute,Harbin 150040,China)

机构地区：[1]黑龙江省机械科学研究院,哈尔滨150040

出　　处：《机械工程师》2018年第4期74-75,78,共3页Mechanical Engineer

摘　　要：根据高性能导电粉在航空、航天、铁路、邮电、通信等领域的应用需求,提出了一种制备新型Ba Ti O_3导电陶瓷粉的稀土扩渗技术及其扩渗装置。采用该扩渗装置对纯Ba Ti O_3粉体进行了稀土Sm元素的扩渗改性研究。研究结果表明:Sm扩渗可有效降低Ba Ti O_3粉体的电阻率,其中扩渗温度是影响扩渗效果的一个重要因素,随着扩渗温度的升高,改性后Ba Ti O_3粉体的电阻率呈现先降后升的"V"型变化规律。当扩渗温度为860℃时,电阻率达到最低值,从扩渗前的4.98×10~9Ω·m降低到4.43×10~4Ω·m。XRD、SEM分析表明,扩渗后稀土元素会取代晶格内部的Ba^(2+)。由于稀土元素的半径更小,因而更容易发生迁移偏离中心,因此经过扩渗后的导电粉导电性能更好,同时具有抗腐蚀、防氧化等性能,具有广阔的应用前景。According to the application demand of high-performance conductive powder in aviation,aerospace,railway,post,telecommunications,and other fields,a new rare earth diffusion technology and its diffusion device for preparing new BaTiO3 conductive ceramic powder are put forward in this paper.The diffusion modification of rare earth Sm elements in pure BaTiO 3 powders is studied by this diffuser.The research results show that:Sm diffusion can effectively reduce the resistivity of BaTiO3 powder,and the diffusion temperature is an important factor affecting the effect of diffusion.With the increase of diffusion temperature,the resistivity of modified BaTiO3 powder presents a"V"change rule which first falls and then rises.When the diffusion temperature is 860 C,the resistivity reaches the lowest value,which is reduced to 4.43*104 Omega m from 4.98*109 m before the diffusion.XRD and SEM analysis showed that the rare earth elements could replace the Ba2+in the lattice.Because the smaller radius of rare earth elements,and thus are more likely to migrate off center,so the conductivity of conductive powder after root penetration after,also has corrosion and oxidation resistance,and has broad application prospects.

关 键 词：稀土 扩渗 BATIO3 导电粉 

分 类 号：TG156.8[金属学及工艺—热处理]