Antimony-containing modifier for zinc-copper alloy and modification treatment method

A metamorphic treatment, copper alloy technology, applied in the field of alloy materials, to achieve the effect of convenient operation, increased number, and uniform distribution

Inactive Publication Date: 2020-02-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, modifying zinc-copper alloys to reduce the grain size of the ε phase, eliminate dendrites or reduce their branches is an important task in production, but effective and feasible modification methods are still rare.

Method used

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  • Antimony-containing modifier for zinc-copper alloy and modification treatment method
  • Antimony-containing modifier for zinc-copper alloy and modification treatment method
  • Antimony-containing modifier for zinc-copper alloy and modification treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The modification treatment method of Zn-8Cu alloy (the mass percentage composition of Cu in this alloy is 8%), concrete steps are as follows:

[0028] (1) Melt the Zn-8Cu alloy to 640°C to obtain an alloy melt.

[0029] (2) Add a certain proportion of pure antimony to the above melt, so that the mass percentage of antimony element in the alloy is 0.08%, and then stir the melt.

[0030] (3) After 15 minutes, stir the melt again to make the antimony element evenly distributed in the melt. Then it is poured into the mold, and the modified zinc-copper alloy is obtained after cooling.

[0031] Before the modification of Zn-8Cu alloy, the ε phase branched well, and the size reached more than 200 μm ( figure 1 ), the branching of ε-phase grains is very little after metamorphosis by the method of this example, and the developed dendrites before metamorphosis are transformed into petal crystals and polyhedron / spherical grains after metamorphosis, with a size of about 90 μm ( ...

Embodiment 2

[0033] The modification treatment method of Zn-8Cu alloy (the mass percentage composition of Cu in this alloy is 8%), concrete steps are as follows:

[0034] (1) Melt the Zn-8Cu alloy to 670°C to obtain an alloy melt.

[0035] (2) Add a certain proportion of pure antimony to the above melt, so that the mass percentage of antimony element in the alloy is 0.5%, and then stir the melt.

[0036] (3) After 20 minutes, stir the melt again to make the antimony element evenly distributed in the melt. Then it is poured into the mold, and the modified zinc-copper alloy is obtained after cooling.

[0037] Before the modification of the Zn-8Cu alloy, the ε phase branches are well developed, and the size reaches more than 200 μm. After the modification by the method of this example, the branching of the ε phase grains is obviously inhibited, and the developed dendrites before the modification are transformed into petal crystals and polyhedrons after modification. Spherical grains with a ...

Embodiment 3

[0039] The modification treatment method of Zn-8Cu alloy (the mass percentage composition of Cu in this alloy is 8%), concrete steps are as follows:

[0040] (1) Melt the Zn-8Cu alloy to 690°C to obtain an alloy melt.

[0041] (2) Add a certain proportion of pure antimony to the above melt, so that the mass percentage of antimony element in the alloy is 1%, and then fully stir the melt.

[0042] (3) After 5 minutes, stir the melt again to make the antimony element evenly distributed in the melt. Then it is poured into the mold, and the modified zinc-copper alloy is obtained after cooling.

[0043] Before the Zn-8Cu alloy is modified, the ε phase branch is developed, and the size reaches more than 200 μm. After the method of this example is modified, the ε phase grain branch is significantly reduced, and the developed dendrite before the modification is transformed into the petal crystal, polyhedron / spherical shape after the modification. Grains, the size is obviously reduced...

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PUM

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Abstract

The invention provides a method for modification treatment on zinc-copper alloy by antimony elements. Modifier is antimony with the purify of 90.20-99.99 wt.% or zinc-antimony intermediate alloy withthe antimony-containing mass percent of 10-20%; and the modifier is added in the alloy smelting process, so that the growth of an epsilon phase can be inhibited, the number of epsilon-phase crystal nucleus is increased, the grain size of the epsilon-phase crystal nucleus is reduced, the branches are reduced, and the distribution of the particles in the alloy matrix tends to be more uniform. Meanwhile, the modification processing method is simple in process and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a modification agent containing antimony element and a modification treatment method for modifying ε phase (copper-zinc compound) dendrites in a zinc-copper alloy. Background technique [0002] The zinc-copper alloy containing 3-10% copper by mass has good mechanical properties and has good application prospects. The matrix of such alloys consists of η-Zn and ε phase (copper-zinc compound) grains. When the zinc-copper alloy is solidified, the ε phase is directly precipitated from the liquid phase first, and then grows freely at a fast growth rate. After solidification, it is easy to grow into complex and large dendrites. Such dendrites reduce the fluidity of the zinc-copper alloy and the casting performance, and at the same time bring a series of adverse effects on the structure and performance, such as: shrinkage porosity and pores are easy to remain in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C18/02
CPCC22C1/03C22C18/02
Inventor 王振卿郑锴王英姿左敏赵德刚
Owner UNIV OF JINAN
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