Method and device for preparing composite pipe/coating by full liquid stirring and semi-solid stirring coating

Abstract

The invention discloses a method and a device for preparing a multiple-unit tube / a coating through a full-liquid stirring and semi-solid stirring coating method. In a full-liquid or semi-solid moltenbath formed by cladding materials, liquid phase is pressed in and stirred through a ceramic tool which rotates at a high speed, on one hand, the liquid phase is stirred so that the liquid phase is mixed evenly and flows back along a tube wall, on the other hand, the liquid phase is driven by the rotating tool to rotate at a high speed, in this way, the liquid phase is stirred, and high-speed relative motion is achieved on the liquid / solid interface, which is beneficial to mechanical decoating and IMC growth suppression. The method and the device can be used for preparing the multiple-unit tubeas well as modifying the internal friction surface of a small-sized pipe barrel.

Description

technical field [0001] The present invention relates to the preparation of metal composite pipes / coatings, in particular to a method for preparing composite pipes / coatings by all-liquid or semi-solid (liquid phase containing solid particles) extrusion-stirring coating (liquid phase stirring coating method for short) , that is, liquid phasestir coating: LPS coating, or stirring brazing method) and devices. Background technique [0002] Aluminum compounding on the surface of steel can improve the high-temperature oxidation corrosion resistance of steel, and the thickness of the corrosion-resistant layer of the composite pipe is thicker than that obtained by the hot-dipping method, and its durability is stronger (Document 1). At the same time, it also has the advantages of high temperature resistance and erosion resistance compared with paint corrosion-resistant layers. [0003] At present, the main preparation methods of composite pipes include direct explosive composite meth...

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Problems solved by technology

[0010] However, the disadvantages of this process are: (1) It is not possible to apply a pressure perpendicular to the interface between the recirculation layer and the inner surface of the cylinder directly along the radial direction of the cylinder (it is difficult to directly apply the extrusion force in the horizontal direction), especially when the plastic flow Metal has flowed vertically upwards around the corner (chamfer) at the bottom of the tool

This will affect the removal and densification of the modified material / substrate interface during all-solid-state welding

(2) The applicant also found in the pre-research of this process that the small diameter will limit the diameter of the stirring tool inside the base material, the linear speed of the stirring tool is small, and the frictional heat generation and softening are insufficient, resulting in the plastic flow of the modified material in the solid state Difficulty, making it difficult to squeeze back

However, experiments have shown that it is very difficult to directly apply FSB technology to the preparation of composite pipe technology, mainly in the following aspects: the radial deformation resistance of the inner pipe is large, which affects the removal of the interface and the densification of the interface; the tool design requires complex requirements, etc.

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