| 摘要 |
PURPOSE:To obtain a spinel-based thermistor porcelain composition having extremely high strength of porcelain without changing electrical properties comprising main components of Mn, Ni and Al as metallic elements and Pb as an auxiliary component. CONSTITUTION:A composition comprising main components of Mn, Ni and Al 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. |
