| 摘要 |
PROBLEM TO BE SOLVED: To obtain a dielectric material from which a dielectric porcelain having a high dielectric const. and stable characteristics can be produced by low temp. sintering by finely pulverizing glass into particles smaller than the average particle size of a dielectric material powder to be mixed, then mixing the glass particles and the dielectric material powder and further pulverizing. SOLUTION: Before a calcined dielectric material powder and a glass powder as a sintering aid are mixed and pulverized, the glass powder is preliminarily pulverized into particles into a size smaller than the average particle size of the dielectric material powder. Then the glass powder and the dielectric material are mixed and further pulverized to obtain the dielectric material of the purpose. The glass powder is preferably pulverized especially to such a degree that the ratio of BET value of the pulverized glass powder to BET value of the dielectric material is >=4. The dielectric material used is, for example, BaO-TiO2 - Nd2 O3 -Bi2 O3 -Nd2 O3 material. The glass powder is weighed to obtain 3-7vol.% of the material and added, and especially, about 5vol.% is preferable. |
