Method for preparing gradient material by stirring friction welding and prepared gradient material

Abstract

The invention discloses a method for preparing a gradient material by stirring friction welding and the prepared gradient material. According to the method, a base plate and a plate layer are involved, wherein a spraying layer is laid on the base plate, the plate layer covers the spraying layer to prefabricate a blank, the thickness of the spraying layer is changed in a gradient mode along the extending direction of the plate surface of the base plate, or the thickness of the plate layer is changed in a gradient mode along the extending direction of the plate surface of the base plate, and theblank is subjected to rolling, stirring, friction and welding in sequence to prepare the gradient material. By adopting the method, the method has the advantages that a large-volume gradient materialcan be prepared, the production efficiency is high, the process is stable, the material utilization rate is high, the energy consumption is low, the pollution is avoided, and the green and the environment protection purposes are achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of gradient materials, and in particular relates to a method for preparing gradient materials by friction stir welding and the obtained gradient materials. Background technique [0002] Gradient materials refer to heterogeneous composite materials whose structure and properties change continuously or quasi-continuously in the direction of material thickness or length. Gradient materials are widely used in aerospace, mechanical, electromagnetic, biological, nuclear energy and electrical engineering fields, such as aerospace engines, bearings in mechanical engineering, magnetic disks and oscillators in electromagnetic engineering, teeth, bones, Joints, thermoelectric converters and other equipment in nuclear energy and electrical engineering. [0003] At present, the methods for preparing gradient materials mainly include chemical vapor deposition, physical evaporation, plasma spraying, particl...

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Problems solved by technology

For example, the process is cumbersome, the equipment cost is high, the process is unstable, the utilization rate is low, the pollution is large, the production efficiency is low, the interface is not tightly bonded, etc.

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