Patent ID: 7776449

Claim:
A biaxially textured composite article with a multilayer structure comprising a rolled and annealed compacted and sintered powder-metallurgy composite perform, the composite preform having an outer layer and at least one inner layer formed by filling and compacting Ni—W powders layer by layer, with the outer layer being filled with outer-layer Ni—W powders and the inner layer being filled with inner-layer Ni—W powders having a W content higher than that of the outer-layer Ni—W powders, so that the W content of the outer layer is lower than the W content of the inner layer; wherein a diffusion layer is formed at an interface between the outer layer and the inner layer and the W content in the diffusion layer gradually decreases from the inner layer side to the outer layer side, and wherein said composite preform comprises two outer layers being a Ni—W alloy with 3-9% W and one or more inner layers being a Ni—W alloy with 9-13% W.