made with the individual grades of colloid the slurry was prepared by mixing the tib 2 powder with the colloidal alumina all the slurries are made with about 9 weight percent colloidal alumina and the rest tib 2 powder the slurry is then coated onto cathode samples as in example i or slip cast into block shaped samples the electrical resistivity of block samples was measured by the four point probe method according to the asth c611 84 standard both for the green body and after bonding by heat treatment u201c sintering u201d a constant current of 1 ampere generated by a keithly u2122 228a voltage current apparatus was passed through the sample and the voltage drop recorded the flexural strength of the green and u201c sintered u201d composite samples was measured by the four point bending test performed with an instron u2122 4206 machine according to the standard method from the astm mechanical property handbook the crosshead speed of loading was kept at a constant rate of 0 1 mm min for all samples for measurement of the interfacial bonding strength the u201c sintered u201d samples were arranged precisely under the instron 4206 machine a small load was applied with the crosshead speed at 1 mm win the maximum load was recorded for the calculation of the interfacial bonding strength.