A kind of high copper alloy for cast tire enamel and preparation method thereof

Abstract

The invention discloses a high-copper alloy for cast blank enamel. The high-copper alloy is prepared from components including copper, zinc, silicon, tin, cerium and boron and is prepared from components in percentage by weight as follows: 96wt%-98.4wt% of copper, 0.6wt%-1.2wt% of zinc, 0.4wt%-1.0wt% of silicon, 0.5wt%-1.3wt% of tin, 0.05wt%-0.1wt% of cerium, 0.005wt%-0.01wt% of boron and the balance of deoxidized residual phosphorus. The melting point of the high-copper alloy ranges from 1,068 DEG C to 1,082.5 DEG C, the solidification temperature range of molten metal is small, the castability is excellent, the alloy is not prone to suction oxidation, and an excellent cast enamel blank is easy to obtain; the alloy has the good thermal-expansion matching performance with conventional enamel glaze and has the thermal expansion coefficient slightly higher than that of the conventional enamel glaze, so that the certain pressure stress is formed inside the fired glaze layer, the crackingresistance of the glaze layer is improved, and firm bonding of the glaze layer and the enamel blank is facilitated; and the corrosion resistance of the high-copper alloy is remarkably superior to thatof pure copper, so that the decoration performance of enamel vessels is favorably improved.

Description

technical field [0001] The invention relates to an alloy, in particular to a high-copper alloy for casting enamel blanks and a preparation method thereof. Background technique [0002] Enamel is a handicraft in which glaze is attached to a metal blank, and cast enamel is a type of enamelware. The wall of the blank for casting enamel is relatively thick, which belongs to the thick blank. During casting, it is necessary to ensure that the molten metal can be filled completely during the pouring process to obtain a sound enamel blank. Since the blank for casting enamel is thicker, and the wall thickness of different parts of the blank is also different, therefore, it is necessary to ensure that the molten glaze and the blank maintain synchronous expansion and contraction during the heating and cooling process. Make the glaze firmly adhere to the green tire without cracking and falling off. [0003] In the existing cast enamel production technology, generally pure copper or ca...

AI Technical Summary

Problems solved by technology

When pure copper is used as the tire blank material, although pure copper has good thermal expansion matching with most glazes, pure copper is very easy to absorb hydrogen and oxygen during the casting process, and the fluidity of pure copper molten metal is not good. Good; in this way, the quality of the cast tire blank will be poor, and it will also cause casting defects such as pores, oxidation inclusions, wrinkled skin, cold insulation incomplete or loose; thus, the glaze on the tire blank will easily occur during firing. Bubbling, glaze jumping, discoloration and other problems

When cast silicon bronze is used as the tire blank material, although the casting performance is improved, the thermal expansion matching between the cast silicon bronze and the glaze is poor, and the glaze layer is prone to cracking and falling off. The hardness is high, and it is difficult to perform surface treatment such as chiseling and scraping on the surface of the tire blank

[0004] The high-copper alloys in the prior art are all used in the industrial field and are not suitable for the production of enamelware

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