The invention discloses a lanthanum oxide doped barium titanate electric function ceramic and preparation method thereof, which is composed of the molar ratio of 1: (x / 2): 1 made of barium carbonate, lanthanum oxide and titanium dioxide, where x = 0.3% ~ 0.75%; the materials used in mixing, plasticizing, milling, granulation pressure, blank, discharging, and broadband CO down 2 laser sintering, i.e.. The invention overcomes the defects of properties of pure barium titanate ceramics doped by rare earth La, has the advantages of cheap material, laser sintering characteristics of low energy consumption, short sintering time, the prepared lanthanum doped barium titanate ceramics product grain is very small, very low porosity, high density, and has high reliability, safety, energy saving and other advantages; the formation of barium titanate ceramics with semiconductor properties, mainly used in the temperature sensitive element, the current limiting element and a constant temperature heating element and so on, in particular to communications, home appliances, aviation, automobile, electrical equipment and other fields.
【技术实现步骤摘要】
本专利技术涉及一种氧化镧La203掺杂钛酸钡电子功能陶瓷及其制备方法,属于电子功能陶瓷的制备
技术介绍
由于纯钛酸钡BaTi03陶瓷居里点不高(12CTC),在室温附近由正交相转变 为四方相时,其介电性、压电性、弹性性能都会发生很大的变化。因此BaTi03陶瓷随温度变 化的特性不利于它的使用。研究表明采用稀土元素对BaTi03进行掺杂,对BaTi03性能的改 善十分显著;其中La的掺杂可使BaTi03陶瓷半导化,并且La"的加入可有效提高BaTi03陶瓷 的介电常数,降低介电损耗,并能使介电常数在较宽的温度范围内保持稳定,提高电容器的 使用寿命。目前掺杂BaTi03陶瓷的制备方法主要有固相烧结法和液相合成法,但这两种制备方法都 存在着各自的缺点固相烧结法对原材料要求较高,产品难以达到分子级混合,物料活性低 ,能量消耗大,容易引进杂质,其纯度、均一性较差,烧结时间长,反应难以控制,得到的 陶瓷元器件成品率低,耐压性能差,陶瓷晶粒较大,有气孔等缺陷;液相烧结法工艺流程长 ,易引起环境污染,粉体易团聚,原料价格昂贵,且需要较高的温度和较高的压力,设备投 资大 ...
【技术保护点】
一种氧化镧掺杂钛酸钡电子功能陶瓷,其特征在于:它是由摩尔比为1∶(x/2)∶1的碳酸钡、氧化镧和二氧化钛制备而成的,其中x=0.3%~0.75%。
【技术特征摘要】
【专利技术属性】
技术研发人员:刘其斌,曲微,刘金鑫,温明旺,
申请(专利权)人:贵州大学,
类型:发明
国别省市:52[中国|贵州]
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