Uniform mixing method of fe-cu-c-ceramic sic composite powder for powder metallurgy

Abstract

A uniform mixing method of Fe-Cu-C-ceramic SiC composite powder for powder metallurgy is aimed at submicron SiC ceramic particles without hydrogen bonds. The invention combines wet mixing and dry mixing techniques to evenly mix raw materials with large differences in physical properties (density, particle size, shape, etc.). Firstly, vibrate and disperse the submicron SiC ceramic particles and graphite, then add copper powder and the first iron powder with the same volume as the SiC ceramic particles to vibrate and disperse; Mix and add an appropriate amount of coupling agent and zinc stearate; the wet-mixed composite powder is vacuum-dried, sieved, and finally mixed with the remaining iron powder using a V-shaped mixer to prepare a uniformly mixed composite powder. The material mixing method of the present invention has simple process, convenient operation, combined with wet mixing and dry mixing techniques to implement step by step, and achieves uniform mixing of raw materials with large differences in physical properties (density, particle size, shape, etc.). Suitable for industrial applications.

Description

technical field [0001] The invention relates to a uniform mixing method of Fe-Cu-C-ceramic SiC composite powder for powder metallurgy, in particular to a uniform mixing method for adding submicron SiC ceramic powder to Fe-Cu-C powder for powder metallurgy . It belongs to the technical field of powder metallurgy. Background technique [0002] Powder metallurgy is a process technology that prepares the required products by preparing powder, mixing the powder evenly, pressing and molding, and sintering. [0003] When preparing composite materials by powder metallurgy technology, when the density, particle size and shape of the reinforcing particles and the matrix powder are similar, the mixing of the two can adopt the conventional method. For example, the invention patent application with the publication number CN 107686938A discloses an iron-based powder metallurgy friction material and its preparation method. It mixes iron-based powder and organic carbon source powder with ...

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Problems solved by technology

The powder metallurgy process has its special requirements. The iron powder produced by the reduction method or the water atomization method has an irregular shape and a particle size of -100 mesh or -80 mesh (the average particle size is tens of microns). In order to keep the iron powder well pressed The shape and particle size distribution of iron powder should not be damaged much during the mixing process; it is necessary to maintain the shape and particle size distribution of iron powder and other raw materials. Or mechanical ball milling and other mixing methods, it is difficult to retain the shape of the original powder, and realize the uniform mixing of the original powder and the exogenous nanometer or submicron ceramic particles which are quite different from the iron base itself in physical properties