钛酸铝-莫来石复相材料电阻率的研究

Study of Aluminum Titanate-Mullite Resistivity

为了解决高温快速测温传感器用陶瓷材料,对钛酸铝-莫来石复相陶瓷材料的电阻率进行了基础性研究,这将有助于优异材料的设计和性能优化,挖掘钛酸铝的应用潜力。研究结果表明,钛酸铝-莫来石复相材料室温时为绝缘材料,电阻率在1011Ω.cm以上;342℃时发生绝缘材料向半导体材料转化,569℃时发生半导体材料向绝缘材料转化;在1 000℃时为半导体材料,电阻率为3.4×104Ω.cm。钛酸铝-莫来石复相材料为负温度系数材料,电阻率在升、降温过程中的变化是不可逆的。

In order to obtain the ceramic material which can be used to temperature-sensor for measuring high temperature fastly, the resistivity of aluminum titanate-mullite ceramic material was foundationally studyed, it will be helpful to design and optimize the outstanding material, so that exploiting the potentian applion of aluminum titanate-mullite. The findings indicated that, aluminum titanate-mullite is insulative material in the room temperature, resistivity is above 1 0^11 Ω· cm; at 342 ℃, it transformed from insulator to semiconductor; at 569 ℃, it trans- formed from semiconductor to insulator;at 1 000 ℃, it is also semiconductor. Aluminum titanate-mullite is subtractive temperature-modulus material, resistivity in the heating and cooling process is irreversible.