Composite brake disc, preparation method thereof and friction stir tool

Abstract

The present application provides a composite brake disc, the preparation method thereof and a friction stir tool. The composite brake disc comprises: an aluminum alloy base layer, and an aluminum matrix composite layer, where the aluminum alloy base layer and the aluminum matrix composite layer are bonded with each other through metallurgical bonding. A transition layer is formed at the boundary surface where the aluminum alloy base layer and the aluminum matrix composite layer are bonded with each other. A reinforced structure connecting the aluminum alloy base layer and the aluminum matrix composite layer is formed in the transition layer. The solutions according to the present application can increase the volume fraction of reinforcement particles in the aluminum matrix composite layer, thus increasing wear resistance, can avoid further addition of ceramic particles into the aluminum alloy base layer, thus increasing the strength and elongation of the aluminum alloy base layer, reducing the failure risk, and increasing the thermal conductivity of the aluminum alloy base layer, so that the heat generated by the friction layer is transferred to the air, thus reducing the overall temperature rise of the brake disc. In addition, the aluminum matrix composite layer in the solutions plays the role of a wear-resistant layer, and a transition layer is formed between the aluminum matrix composite layer and the aluminum alloy base layer through metallurgical bonding. The transition layer can prevent the volume fraction of ceramic particles between the aluminum matrix composite layer and the aluminum alloy base layer from changing instantly, thus reducing the stress difference between the aluminum matrix composite layer and the aluminum alloy base layer due to cold and hot fatigue, and increasing the bonding force between the aluminum matrix composite layer and the aluminum alloy base layer, so as to reduce the failure risk due to cracking between the aluminum matrix composite layer and the aluminum alloy base layer as a result of cold and hot fatigue and so on.

Dependencies are inferred from the claim text.