초록 ▼

A semi-conducting ceramic is disclosed. The ceramic consists essentially of from 50 percent to 72 percent of silicon carbide particles, from 25 percent to 47 percent of silicon nitride particles and a modified silicon oxynitride glass bonded to the silicon carbide particles and bonding the silicon n

A semi-conducting ceramic is disclosed. The ceramic consists essentially of from 50 percent to 72 percent of silicon carbide particles, from 25 percent to 47 percent of silicon nitride particles and a modified silicon oxynitride glass bonded to the silicon carbide particles and bonding the silicon nitride particles together. An improvement in a method for producing an article which comprises silicon carbide particles dispersed in a matrix is also disclosed. The method includes the step of firing or sintering the article to convert the matrix to a densified ceramic with the formation of a liquid phase. The improvement involves embedding the article, prior to firing, in a cover material which contains powdered silicon and maintaining a nitrogen or an inert atmosphere in contact with the cover material during firing. The amount of silicon in the cover material and the composition of the atmosphere are such that the silicon carbide particles are protected against oxidation.

대표청구항 ▼

A semi-conducting ceramic which consists essentially of from 50 percent to 72 percent of silicon carbide particles, from 25 percent to 47 percent of silicon nitride particles and a modified silicon oxynitride glass bonded to the silicon carbide particles and bonding the silicon nitride particles tog

A semi-conducting ceramic which consists essentially of from 50 percent to 72 percent of silicon carbide particles, from 25 percent to 47 percent of silicon nitride particles and a modified silicon oxynitride glass bonded to the silicon carbide particles and bonding the silicon nitride particles together, said ceramic having a weight loss by erosion, when subjected to spark discharges along its surface between electrodes having a spark gap of 1.27 mm in an ignition system which includes a 6 microfarad capacitor, 2000 volts applied, 70 sparks per minute, pressure 400 psi gauge, less than 1.8 mg per hour. *** BRS DOCUMENT BOUNDARY ***