Patent ID: 7560066
Filing Date: 2009-07-14
Classification: B22F,C22C,Y10T

Abstract:
1. A method of preparing a biaxially textured composite article comprising the steps of: a) preparing a preformed composite ingot of a multilayer structure of a composite substrate with an outer layer being a Ni—W alloy and an inner layer being a Ni—W alloy, the W content of the outer layer being lower than the W content of the inner layer; b) sintering the preformed composite ingot to form a metal alloy composite ingot; c) rolling the metal alloy composite ingot to form a cold-rolled composite substrate; and d) annealing the cold-rolled composite substrate to form the biaxially textured composite article with high mechanical strength and reduced magnetization, said multilayer structure of the composite substrate having at least three layers, one or more inner layer being a Ni—W alloy with 9-13% W, and two outer layers being a Ni—W alloy with 3-9% W, with the content of W gradually decreasing from the inner layer to the outer layers; characterized in that the preformed composite ingot is prepared by filling and compacting Ni—W mixed powders into a mould layer by layer according to the multilayer structure of the composite substrate; in said mould, said preformed composite ingot having a total thickness of 5-250 mm, the thickness of the two outer layers being 2/9-⅔ of the total thickness.