Nano carbon black and nano rare earth synergistic-enhanced metal matrix micro-nano powder and preparation method thereof

Abstract

The invention discloses nano carbon black and nano rare earth synergistic-enhanced metal matrix micro-nano powder and a preparation method thereof. The powder is characterized by comprising the following components in percentage by mass: 0.5-3% of nano carbon black powder, 2-4% of nano rare earth powder and 93-97.5% micron metal powder, wherein the percentage sum of the components is 100%; and core-shell structure micro-nano powder with the micron metal powder as core and with the nano carbon black powder and the nano rare earth powder as shell is formed. The preparation method comprises the following steps: single-phase nano carbon black suspension and single-phase nano rare earth suspension are prepared firstly, and are mixed to form double-phase nano suspension; then the double-phase nano suspension and spherically preprocessed micron metal powder are mixed, milled with balls, and are dried to prepare the metal matrix micro-nano powder. As the nano carbon black and the nano rare earth are synchronously guided in, the adding quantity of the nano carbon black can be further increased, so that better absorptivity for laser is achieved; produced thin-walled pieces have less deformation, narrow heat influence areas and good wear resistance, and can satisfy the requirements of powder conveying through the present laser forming mainstream technology, that is direct powder conveying type laser forming technology; and the powder has stronger engineering practicability and excellent application prospect.

Description

[0001] technical field [0002] The invention relates to a metal-based micro-nano powder and a preparation method thereof, in particular to a metal-based micro-nano powder for laser remanufacturing and a preparation method thereof, in particular to a metal-based nano-carbon black and nano-rare earth synergistically reinforced Micro-nano powder and its preparation method. Background technique [0003] On May 13, 2010, 11 ministries and commissions including the National Development and Reform Commission, the Ministry of Science and Technology, and the Ministry of Industry and Information Technology jointly issued a document to promote the development of the remanufacturing industry, raising the development of remanufacturing projects to a basic national policy for realizing my country's sustainable development strategy. As the first to advocate and actively promote remanufacturing engineering in China, Professor Xu Binshi, an academician of the Chinese Academy of Engineering,...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing laser remanufacturing powder has a low absorption rate of laser light, which leads to many limitations of laser remanufacturing technology in the process of remanufacturing thin-walled parts, such as large heat input, and to invent a Nano-carbon black and nano-rare earth synergistically reinforced metal-based micro-nano powder and its preparation method provide a material basis for the wide application of laser remanufacturing technology in the remanufacturing of thin-walled parts

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