マルチファンクショナルセラミックス(MFC)の開発
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概要
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MFC based on SrTiO<SUB>3</SUB> or (Sr, Ca)TiO<SUB>3</SUB> ceramics were developed as a noise and surge absorption element. They have both characteristics of varistor and capacitor. They showed the excellent electrical characteristics such as ε s.app; (6-40)×10<SUP>4</SUP>, a; 10-20, the current surge absorption capabilities; 3000A/cm<SUP>2</SUP> and so on. The semiconductive ceramic grains and the grain boundaries of a SrTiO<SUB>3</SUB> ceramic with a BL structure were much effective on these electrical characteristics. So, these electrical characteristics were obtained by controlling the BL structure of (Sr, Ca)TiO<SUB>3</SUB> base ceramics. The grain sizes of SrTiO<SUB>3</SUB> ceramics were controlled between 10μm and 150 μm.<BR>In addition, The increase of the leakage currency through a MFC was unobserved after supplying several high surge impulses, while that of a ZnO ceramic varistor was much more in the same condition.<BR>When MFC was applied on a power transformer circurt and a fast rise-up impulse noise were supplied to the cercuit, it has been comfirmed that the induced noise level observed on a secondary transformer circuit can be depressed to lower level. In consequent, MFC is available to prevent electrical equipments from being damaged by a noise or a high surge energy.
- 社団法人 粉体粉末冶金協会の論文