SOLID INSULATOR AND METHOD OF MANUFACTURING THE SAME.

摘要

The present invention aims at providing a solid insulator of a high strength, and a method of manufacturing the same. The solid insulator is characterized in that it consists of porcelain in which the quantity of crystals of cristobalite is not more than 10 %, an internal strain in the direction of compression in a columnar insulator body being larger in the diametrically inner portion thereof than in the diametrically outer portion thereof, the difference Y between the internal strain in the outer circumferential portion of the insulator body and that in the diametrically central portion thereof Y >/= (1.76 x 10<-><6>)X, wherein X(mm) represents the diameter of the insulator body. A method of manufacturing such a solid insulator is characterized in that a sintered insulator is quenched so as to increase the difference between the internal strain in the inner portion of the insulator and that in the outer portion thereof.