Patent ID: 8757472
Filing Date: 2014-06-24
Classification: C04B,C23C,Y10T

Abstract:
1. A method for joining a ceramic composite part, comprising at least one ceramic material and diamond material, to at least one other part, the method comprising the following steps: treating a joining surface or surfaces of the ceramic composite part to increase the surface area of the joining surface of the ceramic composite part; coating the treated surface or surfaces, or portions thereof, with a material comprising an attachment layer which is capable of bonding chemically to the diamond material and a brazeable layer, the attachment layer and the brazeable layer being applied in sequence onto the joint surface; and brazing the surface or surfaces thus treated and coated to the at least one other part through a braze; wherein the attachment layer includes a carbide grown onto a portion of the diamond material or surfaces at the joining surface, the brazeable layer is comprised of a material formulation that includes a refractory metal selected from the group consisting of W, Mo, Cr, Ni, Ta, Au, Pt, Pd, Nb or any combination or alloy thereof, and the surface treatment is conducted in two stages, the first stage of the surface treatment comprising treatment with an acid or combination of acids such that exposed ceramic material at the joining surface or surfaces is roughened or etched, and the second subsequent stage being treatment with a second acid selected to remove graphite at the joining surface on any exposed diamond surface.