A kind of zinc alloy and its manufacturing method

Abstract

The invention discloses a zinc alloy and a manufacturing method thereof. The zinc alloy comprises the following elements: 4-7% of Al, 0.5-1.5% of Cu, 0.4-0.7% of Ti, 0.07-0.1% of B, 0.02-0.025% of Mg,0.1-1% of others, and the balance Zn. The method comprises the following steps: (1) pure aluminum is heated to a molten state, and is sprayed on the inner surface of a crucible; and a filter structure is fixed on the side surface of the inner surface; (2) zinc alloy raw materials are put in the crucible, and are vacuumized and heated until the raw materials are totally molten to obtain a molten pool; (3) a graphite stirring device is started; and a refining agent is continuously added to obtain a purified molten pool; (4) the purified molten pool is modified, and is cast and molded by a cooling extrusion process to obtain a zinc alloy ingot to be treated; and (5) the zinc alloy ingot to be treated is subjected to spheroidizing annealing to obtain the needed zinc alloy. The zinc alloy is high in purity, low in large-size dendritic segregation, uniform in overall grain size refining and low in primary structure multiple eutectic dendritic crystals.

Description

technical field [0001] The invention relates to the technical field of zinc alloy smelting, in particular to a zinc alloy and a manufacturing method thereof. Background technique [0002] Zinc alloy is an alloy composed of zinc and other elements. Often added alloying elements are aluminum, copper, magnesium, cadmium, lead, titanium and other low-temperature zinc alloys. Zinc alloy has a low melting point, good fluidity, easy welding, brazing and plastic processing, corrosion resistance in the atmosphere, and the residual waste is easy to recycle and remelt; but the creep strength is low, and it is prone to dimensional changes caused by natural aging. [0003] In addition to the above-mentioned essential performance defects, the zinc alloys in the prior art also have the following technical problems: 1. Since most of the zinc alloys are manufactured due to lower smelting costs (mainly low energy consumption and low raw material costs at smelting temperature), Therefore, th...

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Problems solved by technology

Zinc alloy has low melting point, good fluidity, easy fusion welding, brazing and plastic processing, corrosion resistance in the atmosphere, and the residual waste is easy to recycle and remelt; but the creep strength is low, and it is easy to cause dimensional changes caused by natural aging

[0003] In addition to the above-mentioned essential performance defects, the zinc alloys in the prior art also have the following technical problems: 1. Since most of the zinc alloys are manufactured due to lower smelting costs (mainly low energy consumption and low raw material costs at smelting temperature), Therefore, there are many impurities, and it can only be used for decorative applications, but not for structural and functional applications; 2. In the prior art, even for high-end functional zinc alloys, the casting structure dendrites are generally large in size and have obvious segregation ;3. The melting point of zinc alloy is low. The existing technology generally uses 60°C-80°C superheat for melting. Although the melting cost is reduced and the melting efficiency is improved, it also causes the original ingot grain size to be too coarse and the grain size is not uniform. , which limits the precision machining, heat treatment and final application of zinc alloys; 4. The zinc alloy master ingots in the prior art are all interlaced and embedded with many dendrites (columnar single crystals), and a small amount of eutectic structure is mixed between the crystals structure, and according to the prior art, the larger the proportion of eutectic structure, the higher the obtained fluidity and the better casting filling performance

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