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A strontium-containing cast zinc alloy and its preparation method

A zinc alloy and master alloy technology, which is applied to the field of strontium-containing cast zinc alloy and its preparation, can solve the problems of large lattice mismatch, which is not conducive to effective nucleation core, etc., and achieves refining as-cast dendrites and improving alloys. The effect of comprehensive mechanical properties and elongation improvement

Active Publication Date: 2016-01-13
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The atomic radius of Sr is 0.200nm, and the atomic radius of Zn is 0.133nm. The atomic radius difference between the two is 33.5%. The lattice mismatch is relatively large, which is not conducive to serving as the effective nucleation core of the η-Zn phase.
Therefore, there has been no public report on the addition of trace amounts of Sr to cast zinc alloys to improve the alloy structure and improve the mechanical properties of the alloy.

Method used

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  • A strontium-containing cast zinc alloy and its preparation method
  • A strontium-containing cast zinc alloy and its preparation method
  • A strontium-containing cast zinc alloy and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Add Sr at 0.03% of the total mass of the zinc alloy, use pure Zn ingots with a purity greater than 99.97%, Zn-5%Al master alloys, Al-10%Sr master alloys, and Al-11.07%Mg master alloys as raw materials. -Al master alloy is put into the smelting furnace, the temperature is raised to 550°C, and then Al-Mg master alloy, pure Zn ingot and Al-Sr master alloy are added in turn, and the temperature is raised to 650-660°C. After the metal is completely melted, stir evenly, With 0.3% NH of the total weight of ingredients 4 The Cl refining agent refines the alloy liquid, removes slag, cools down to 500-550°C, and after standing for 10 minutes, removes slag and casts. The composition and weight percentage of the alloy are: 3.5%Al, 0.039%Mg, 0.03%Sr, and the rest is Zn. The alloy structure after adding Sr element is as follows: figure 1 As shown in (b), compared with Comparative Example 1, the size of white dendrites is reduced. Its mechanical properties are the same as the alloy...

Embodiment 2

[0040] Add Sr at 0.06% of the total mass of the zinc alloy, use pure Zn ingots with a purity greater than 99.97%, Zn-5%Al master alloys, Al-10%Sr master alloys, and Al-11.07%Mg master alloys as raw materials. -Al master alloy is put into the smelting furnace, the temperature is raised to 550°C, and then Al-Mg master alloy, pure Zn ingot and Al-Sr master alloy are added in turn, and the temperature is raised to 650-660°C. After the metal is completely melted, stir evenly, With 0.3% NH of the total weight of ingredients 4 The Cl refining agent refines the alloy liquid, removes slag, cools down to 500-550°C, and after standing for 10 minutes, removes slag and casts. The composition and weight percentage of the alloy are: 3.8% Al, 0.079% Mg, 0.06% Sr, and the rest is Zn. The alloy structure after adding Sr element is as follows: figure 1 As shown in (c), the white dendrites are significantly reduced in size and distributed in the matrix in a nearly equiaxed shape. Its mechanica...

Embodiment 3

[0042] Add Sr at 0.10% of the total mass of the zinc alloy, use pure Zn ingots with a purity greater than 99.97%, Zn-5%Al master alloys, Al-10%Sr master alloys, and Al-11.07%Mg master alloys as raw materials. -Al master alloy is put into the smelting furnace, the temperature is raised to 550°C, and then Al-Mg master alloy, pure Zn ingot and Al-Sr master alloy are added in turn, and the temperature is raised to 650-660°C. After the metal is completely melted, stir evenly, With 0.3% NH of the total weight of ingredients 4 The Cl refining agent refines the alloy liquid, removes slag, cools down to 500-550°C, and after standing for 10 minutes, removes slag and casts. The composition and weight percentage of the alloy are: 4.3%Al, 0.049%Mg, 0.10%Sr, and the rest is Zn. The alloy structure after adding Sr element is as follows: figure 1 As shown in (d), the size of the white phase is further reduced, and the energy spectrum of the second Sr-containing phase is as follows image 3...

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Abstract

The invention relates to a strontium containing casting zinc alloy and a preparation method thereof. The alloy comprises the following components in percentage by weight: 3.5-4.8% of Al, 0.02-0.08% of Mg, 0.03-0.14% of Sr, less than 0.02% of sum of inevitable impurities such as Pb, Cd, Fe and Sn, and the balance of Zn. The preparation method comprises the following steps: first, placing a Zn-Al intermediate alloy in a smelting furnace and heating to 550 DEG C; then, sequentially adding an Al-Mg intermediate alloy, a pure Zn ingot and an Al-Sr intermediate alloy and heating to 650-660 DEG C; after metals are completely smelted, stirring, refining and drossing; cooling to 500-550 DEG C; standing, drossing and casting. The plasticity and toughness of the zinc alloy can be effectively improved, and the comprehensive performance of the casting zinc alloy is improved. The alloy production process is simple in flow, and the zinc alloy dendritic crystals as cast condition are effectively refined, the interlamellar spacing of lamellar tissues among net cells of the dendritic crystals is shortened, the volume fraction of the brittle phase is reduced, and the mechanical property of the alloy is improved.

Description

technical field [0001] The invention relates to a strontium-containing cast zinc alloy and a preparation method thereof, belonging to the technical field of metal material preparation. Background technique [0002] Cast zinc alloys have the advantages of low melting point, less energy consumption for smelting, good fluidity and formability, high production efficiency, low manufacturing cost, and wide range of surface treatments. Die castings with thin walls, complex shapes and precise dimensions can be obtained. With the rapid development of my country's automobile industry, real estate and household appliances and other industries, my country's demand for cast zinc alloys is growing rapidly. Therefore, cast zinc alloys are being more and more widely used in various fields and bring significant economic benefits. However, traditional cast zinc alloys generally have problems such as well-developed dendrite structure and poor mechanical properties, which greatly reduce the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C18/04C22C1/03
Inventor 李红英蒋浩帆刘洋徐雪璇
Owner CENT SOUTH UNIV
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