Methods for preparing copper-plate surface modifying WC-Cu alloy layer for continuous-cast crystallizer and application thereof

Abstract

The invention relates to methods for preparing a copper-plate surface modifying WC-Cu alloy layer for a continuous-cast crystallizer and an application thereof. The WC-Cu alloy layer is especially suitable for a copper plate modifying layer of a crystallizer for continuously casting steel and nonferrous metal. The modifying layer comprises 30.0-70.0wt% of WC, 23.0-69.65wt% of Cu, 0.1-2.0wt% of Ni,0.05-2.0wt% of Ag and 0.2-3.0wt% of Co. The following two methods can used for preparing the WC-Cu alloy layer: a. hot pressed sintering which is characterized by (1) uniformly mixing power and forming by hot pressed sintering; and (2) casting molten copper on the sintered WC-Cu alloy, or placing a copper plate on the WC-Cu alloy, heating to melt down the copper, carrying out infiltration with the WC-Cu alloy, cooling, and then obtaining a copper plate product with the WC-Cu alloy modification layer; and b. infiltration method which is characterized by (1) uniformly mixing power, cold pressing the power into infiltration frame and sintering the infiltration frame at a high temperature; and (2) casting the molten copper on the WC-Cu alloy frame for infiltration, or placing a copper plate on the WC-Cu alloy frame, heating to melt down the copper, carrying out infiltration with the WC-Cu alloy frame and cooling. The WC-Cu alloy layer has the advantages of greatly improving the productivity of the crystallizer and solving the problem of pollution caused by copper plate galvanization of the crystallizer, and the invention provides a high-efficiency and environment-friendly crystallizersurface modification method.

Description

technical field [0001] The invention relates to a preparation method and application of a modified WC-Cu alloy layer on the copper plate surface of a continuous casting crystallizer. The WC-Cu alloy layer is suitable for continuous casting crystallizers in the metallurgical industry, especially for continuous casting of steel and non-ferrous metals Modified layer of crystallizer copper plate. Background technique [0002] Continuous casting is the abbreviation of continuous casting. Compared with traditional methods, continuous casting technology has significant advantages such as greatly improving metal yield and billet quality, and saving energy. [0003] The specific process of continuous casting (taking continuous steel casting as an example) is: molten steel continuously passes through the water-cooled crystallizer, condenses into a hard shell, and then is continuously pulled out from the outlet below the crystallizer, cooled by water spray, and then cut into billets a...

AI Technical Summary

Problems solved by technology

[0007] (1) The thermal conductivity of the coating is low, generally only 1 / 5 of the copper plate, which acts as a thermal resistance on the surface of the mold and reduces the cooling efficiency of molten steel;

[0008] (2) The thermal expansion coefficients of the coating and the copper plate are different, which can easily induce cracks between the coating and the copper plate, resulting in peeling off of the coating, so the service life of the electroplated copper plate of the crystallizer is generally not high, which directly affects the efficiency of continuous casting production

[0009] (3) The environmental hazards of electroplating production are relatively large, and many developed countries have transferred such industries to developing countries such as my country

[0010] The present invention is proposed in view of the current situation that the copper plate coating of the continuous casting crystallizer has short service life, low thermal efficiency, and great environmental hazards, which restrict the production efficiency of continuous casting.