| 摘要 |
PURPOSE:To obtain a spinel-based thermistor porcelain composition having extremely high strength of porcelain without changing electrical properties comprising Mn, Ni and Co as main components and Pb as an auxiliary component. CONSTITUTION:A composition comprising main components of Mn, Ni and Co as metallic elements is blended with 0.1-10.0 atomic % Pb as an auxiliary component and optionally further 0.1-10.0 atomic % based on the main components of at least one of B and Si to give a high-strength thermistor porcelain composition. In the composition, a liquid-phase reaction partially occurs at a point of sintering, a spinel phase of main component elements is precipitated during cooling, then Pb, B and Si of addition elements remain in a grain boundary and a glass phase is formed to contribute to increase in strength. |
