英语翻译摘要：PTC 材料是一种温度敏感的铁电半导体材料,是近年来发展迅速的新型电子材料之一,但目前高居里温度 PTC

英语翻译
摘要：PTC 材料是一种温度敏感的铁电半导体材料,是近年来发展迅速的新型电子材料之一,但目前高居里温度 PTC 材料都是用含铅物质作为居里温度移动剂来制备,且在烧结工艺过程中,由于铅元素的挥发而污染环境,损害人体健康.为了替代目前对环境和人体有害的含铅PTC陶瓷材料,本文以寻求一种新型无铅PTC陶瓷的配方组成及制备工艺.采用氧化铋、碳酸锂、二氧化钛为原料,利用高温固相法制备钛酸锂铋（Bi0.5Li0.5TiO3,简写为BLT）粉体,替代铅作为居里温度移动剂,并利用此粉体制备BLT致密陶瓷.本实验首先制备了 BLT粉体,研究在制备BLT时以不同温度对粉体进行烧结本对制品的影响,并确定了 BLT 粉体最佳烧结温度为 800℃.如果 BLT 不预先合成而是以各自的化合物的形式加入,Bi和 Li 的化合物就会在制备的各个过程损失,而不能起到居里温度移动剂的效果.预先合成的 BLT 和主晶相 BaTiO3及其它添加剂进行二次合成,制备出无铅高居里温度 PTC 材料.用 XRD 和金相显微测试组成、粒度、显微结构等进行了表征.
关键字：PTC,BLT,无铅化,高居里点,温度.
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PTC materials is a kind of temperature sensitive ferroelectric semiconductor material, is one of the new electronic materials in recent years has developed rapidly, but current high Curie temperature PTC materials are made of lead material preparation as Curie temperature of mobile agent, and in the process of sintering process, due to the volatilization of lead pollution of the environment, damage human health. In order to replace the current that is harmful to the environment and human body lead PTC ceramic materials, this article to seek a new lead-free PTC ceramic composition of formulation and preparation process. Using bismuth oxide, lithium carbonate, titanium dioxide as raw material, lithium bismuth titanate was prepared by high temperature solid phase method (Bi0.5 Li0.5 TiO3, abbreviated to BLT) powder, alternatives to lead as the Curie temperature of mobile agent, and using the BLT dense ceramic powder preparation. First, BLT powder was prepared in this experiment, at the time of preparation of BLT in different temperature on the powder for sintering the influence on products, and determine the best sintering temperature is 800 ℃ BLT powder. Synthetic but if BLT advance in their compound forms to join, Bi and Li compounds will be lost in each preparation process, and cannot have the Curie temperature of mobile agent effect. Synthesis of BLT in advance and the main secondary synthesis of BaTiO3 crystal phase and other additives, lead-free, high Curie temperature PTC materials is prepared. Using XRD and metallographic microscopic test composition, particle size, had been used to characterize the microstructure, etc.