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环形压敏电阻器的研究与制备
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摘要
SrTiO_3多功能陶瓷压敏电阻器具有可克服ZnO压敏电阻器不足之处的多种电气功能。它所具有的吸收高频噪声、前沿快脉冲上升噪声及自复位功能,使其在电源输入端、吸收电感性负载开关浪涌电压、保护双向可控开关器件、旁路电容器、微型电机等方面有着广泛的用途。
     本论文的研究主要包括两部分,第一部分为使用溶胶-凝胶法和固相合成法制备钛酸锶粉体材料。第二部分是在制备的钛酸锶粉体材料的基础上,通过掺杂施主、受主离子对钛酸锶材料进行半导化,制备电容-压敏双功能器件,并对两种方法制备的元件性能分析比较。
     首先,分别采用溶胶-凝胶法和固相合成法,制备出钛酸锶粉体材料。用溶胶-凝胶法制备钛酸锶粉体材料中研究了搅拌时间、凝胶时间、凝胶温度、煅烧温度等工艺参数对制备钛酸锶粉体材料的影响。用固相合成法制备钛酸锶粉体材料中研究了Ti/Sr比、研磨方法对制备钛酸锶粉体材料的影响。
     然后,在制备的钛酸锶粉体材料的基础上,采用传统的陶瓷工艺制备SrTiO_3基电容-压敏双功能陶瓷器件。在SrTiO_3基双功能陶瓷的制备中,最关键的是晶粒生长、晶粒半导化和晶界绝缘化。SrTiO_3晶粒生长和半导化受到多种因素的影响,诸如掺杂剂的种类和含量、Ti/Sr比、烧结温度等,这些因素是相互影响、相互作用的。因此,本文对这些影响因素进行了研究。
     最后,采用XRD、SEM等测试分析手段,对实验样品进行检测分析。
Multifunction SrTiO3 ceramic varistor has the advantages over ZnO varistor in many electric function . It's high-frequence noise absorption, absorption of noise caused by rapid rise of front and self-reset function have widespread application in imput of supply ,for absorption of inductive load switching surge voltage and for protection of two-way thyristor switching device ,bypass capacitors ,micro-machines and the others.
    Research of this thesis include two parts mainly, first part include the preparation of SrTiO3 powder materials by sol-gel process and solid phase synthesis process. The second part , on the base of strontium titanate powder materials prepared , SrTiO3-based capacitor-varistor double function ceramic were fabricated by the conventional ceramic process.
    First of all, prepare SrTiO3 powder materials by sol-gel process and solid phase synthesis process. Stir time, gel time, gel temperature, heat treat temperature and so on are researched in sol-gel process. The method of grind, Ti/Sr ratio are researched in solid phase synthesis process.
    Second, on the base of strontium titanate powder materials prepared , SrTiO3-based double function ceramic were fabricated by the conventional ceramic process. For SrTiO3-based double function ceramic, it is well know that the suitable grain size, the semiconducting of grain and the insulating of grain boundary are important keys. The growth and semiconducting of grains are influenced by a lot of factors , such as the type and contents of dopants , Ti/Sr ratio , sintering temperature and so on . All of the above factors are relevant and restricted with each growth . Therefore, in this paper the effect of the above factors were studied .
    Finally, the sample was characterized by XRD,SEM methods.
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