Importance

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Abstract

Multilayer capacitors with have been made including a cadmium silicate flux by firing in a closed crucible at about 1100.degree. C. to provide a high K and smooth X7R coefficient of K with temperature, but tend to acquire a low insulation resistance in a high temperature life test under voltage. This problem was solved heretofore by the added step of a post-sinter anneal. However, the anneal step adds cost and further complexity to the manufacturing process. Through a number of experiments it has been discovered that by the addition of a very small and critical quantity of a calcium compound such as calcium carbonate or calcium niobate to the start ceramic powder that the unwanted anneal step may be eliminated while maintaining a high insulation resistance in an accelerated life test and with only a very small reduction of dielectric constant or smoothness with temperature

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First Claim