METHOD FOR BONDING CERAMIC TO ANOTHER CERAMIC OR METAL BY USING MONOCLINIC-TETRAGONAL PHASE TRANSITION IN ZIRCONIA

摘要

PROBLEM TO BE SOLVED: To develop a bonding method to form a material having the merits of a ceramic and the merits of a metal in view of the fact that, although a ceramic such as alumina, silicon nitride, or zirconia has excellent properties including heat resistance, corrosion resistance, and abrasion resistance, and a metal has physical and chemical properties different from those of a ceramic, the respective materials have both merits and demerits.;SOLUTION: The bonding method comprises partly inserting an insertion member having a coefficient of thermal expansion higher than that of a holed member into the hole in the holed member and firing them to bond them by utilizing the monoclinic-tetragonal phase transition in zirconia, whereupon they can be bonded to each other because the expansion resulting during the phase transition in 20 to below 99 vol.% zirconia undergone the monoclinic-tetragonal phase transition eliminates the clearance between them resulting from the difference between their coefficients of thermal expansion during cooling after the firing and besides the pressure which restrains the expansion-inducing tetragonal-monoclinic phase transition in the residual zirconia remaining to be tetragonal can produce a frictional force between the exterior surface of the bonded layer and the internal surface of the hole in the holed member and between the interior surface of the bonded layer and the insertion member.;COPYRIGHT: (C)2005,JPO&NCIPI