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A manufacturing method and zinc alloy technology, applied in the field of zinc alloy smelting, can solve problems such as uneven grain size, size change, and low creep strength, and achieve the elimination of segregation that is not serious in rapid cooling and the reduction of lamellar thickness , The effect of increasing heterogeneous crystal nuclei
Active Publication Date: 2020-02-04
GUIZHOU INST OF METALLURGY & CHEM ENG
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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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Embodiment 1
[0031] A zinc alloy, the content of each element of the zinc alloy is: Al4%-7%, Cu0.5%-1.5%, Ti0.4%-0.7%, B0.07%-0.1%, Mg0.02%-0.025% , other 0.1%-1%, Zn balance;
[0032] The manufacturing method of the zinc alloy comprises the following steps;
[0033] 1) Preparation before production
[0034] ① Raw material preparation: Prepare Zn-Al4 alloy 99kg-99.35kg, AlTi5B master alloy 0.55kg-0.9kg, ZnCl 2 Refining agent 0.05kg-0.15kg, sufficient amount of pure aluminum, compound salt modifier composed of K2TiF6 and KBF4 with a mass ratio of 4:1 0.7kg-0.8kg;
[0035] ②Equipment and tooling preparation: Prepare vacuum melting equipment with built-in air passage, graphite stirring device and melting crucible, protective atmosphere furnace, graphite crucible with mechanical stirring device, alumina ceramic structural parts, primary rough The filter structure is composed of a screen and an online filter screen made of carbon fiber ceramic composite material lined on the outer surface of...
Embodiment 2
[0044] The whole is consistent with Example 1, the difference is:
[0045] The modificator is TiCl4.
Embodiment 3
[0047] The whole is consistent with embodiment 1, the difference is: using Figure 6 The shown crucible structure, during smelting:
[0048] ③ Turn on the graphite stirring device, change the stirring direction every 1min-3min at a stirring rate of 50rpm-60rpm, stir the molten pool obtained in step ②, and then add the modifier prepared in stage 1) step ① into the molten pool for 15min -20min, to obtain a purified molten pool;
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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...
Claims
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Application Information
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