家用电器、理发、照相和食品加工等行业中,都需用电热器。电热器的关键材料是发热体。目前大部分的发热体是用难熔金属做的电热丝因温度难以精确控制,常会发生过热现象。不仅浪费电源,而且还会造成物品的烤糊烘焦。最近科学家们研制出一种新型的陶瓷发热体,它是以钛酸钡为基质的材料制成的。特点是当它处在自己的相变温度附近时,电阻便猛然增加一千倍至十万倍,这时电流就立即“断开”,加热也随之而止。当温度降低到一定的范围时,电阻又逐浙减小,电流 Household appliances, haircuts, photography and food processing industries, all need to use electric heaters. Electric heater is the key material is heating body. At present, most of the heating element is made of refractory metal heating wire is difficult to accurately control the temperature, often overheating occurs. Not only a waste of power, but also cause the object baking paste baked coke. Recently, scientists have developed a new type of ceramic heating element, which is made of barium titanate-based material. The characteristic is that when it is near its own phase transition temperature, the resistance suddenly increases a thousand times to 100,000 times, when the current immediately “off”, the heating is also stopped. When the temperature dropped to a certain range, the resistance is reduced by Zhejiang, current