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Vanadiferous magnesium intermediate alloy grain refiner and preparation method and application thereof

A technology of grain refiner and master alloy, which is applied in the field of vanadium-containing magnesium master alloy grain refiner and its preparation, and achieves the effect of broad market application prospect, easy control of addition amount, and simple operation

Active Publication Date: 2017-10-03
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although vanadium-containing grain refiners have been disclosed in this patent, this method should be classified as adding solute elements, which still has the described defects

Method used

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  • Vanadiferous magnesium intermediate alloy grain refiner and preparation method and application thereof
  • Vanadiferous magnesium intermediate alloy grain refiner and preparation method and application thereof
  • Vanadiferous magnesium intermediate alloy grain refiner and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Weigh 360g of pure magnesium powder and 40g of VC powder as raw materials, and mix the above two powders by ball milling. The ball milling medium is alcohol, and the ratio of ball to material is 10:1. Grinding on the type ball mill for 12 hours, using intermittent ball milling mode, that is, ball milling for 3 hours, pausing for 20 minutes, after the ball milled mixed powder is vacuum dried, the mixed powder is placed in a graphite mold with a diameter of 70mm, and the pressure is 40MPa in a vacuum hot pressing furnace , the hot pressing temperature is 550° C., the heat preservation time is 60 min, and the 90wt.% Mg-10wt.% VC master alloy sintered block is obtained by hot pressing.

[0035] Sinter the above-mentioned intermediate alloy block, remove the surface scale to a suitable size, and preheat it at 400°C for 2 hours. In the extruder, the extrusion temperature is 400°C, and the extrusion ratio is 89:1 to obtain a diameter of 9mm. 90wt.% Mg-10wt.% VC master alloy gr...

Embodiment 2

[0037] Take by weighing raw material pure magnesium powder 396g, VC powder 4g, above-mentioned two kinds of powder ball mills are mixed, and ball milling medium is acetone, is 8:1 according to ball-to-material ratio, is placed in agate jar, feeds argon protection after vacuumizing, in The planetary ball mill was milled for 6 hours, and the intermittent ball milling mode was adopted, that is, the ball milled for 3 hours and paused for 15 minutes. After the ball-milled mixed powder is dried in vacuum, the mixed powder is placed in a graphite mold with a diameter of 70 mm. In a vacuum hot-pressing furnace, the pressure is 30 MPa, the hot-pressing temperature is 450 ° C, and the temperature is kept for 30 minutes. 99wt.% Mg- 1wt.% VC master alloy sintered block.

[0038] Sinter the 99wt.%Mg-1wt.%VC master alloy block, car off the surface scale to a suitable size, preheat at 350°C for 1h, and in the extruder, the extrusion temperature is 350°C, and the extrusion ratio is 89:1 to o...

Embodiment 3

[0040]Weigh 360g of pure Mg powder and 40g of VN powder as raw materials, mix the above two powders by ball milling, the ball milling medium is alcohol, and the ratio of ball to material is 8:1. The ball mill was milled on the type ball mill for 6 hours, and the intermittent ball mill mode was adopted, that is, the ball mill was milled for 3 hours, and the pause was 15 minutes. After the ball-milled mixed powder is dried in vacuum, the mixed powder is placed in a graphite mold with a diameter of 70mm, and placed in a vacuum hot-pressing furnace with a pressure of 40MPa, a hot-pressing temperature of 450°C, and a heat preservation time of 30min to obtain 90wt.% Mg by hot-pressing - 10wt.% VN master alloy sintered block.

[0041] Sinter the 90wt.%Mg-10wt.%VN master alloy block, car off the surface scale to a suitable size, preheat it at 350°C for 1h, and put it in the extrusion machine, the extrusion temperature is 350°C, and the extrusion ratio is 89:1, to obtain Φ9mm Mg-10wt....

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Abstract

The invention discloses a vanadiferous magnesium intermediate alloy grain refiner and a preparation method and application thereof. The grain refiner comprises, by mass, 90-99% of magnesium and the balance vanadium compound which is composed of at least one of VC, VN, VC<x>N<1-x>, and in VC<x>N<1-x>, x is larger than 0 and less than 1. The invention further discloses the preparation method of the vanadiferous magnesium intermediate alloy grain refiner. According to the vanadiferous magnesium intermediate alloy grain refiner, the vanadium compound can be used as an effective heterogeneous nucleation core of magnesium alloy and prepared into magnesium intermediate alloy, the adding amount is easier to control, using is convenient, the yield is high, and limiting of the content of the magnesium alloy is avoided (the grain refiner can be added into both magnesium alloy containing Al and magnesium alloy free of Al); and after the grain refiner is added into the magnesium alloy, the grain of the magnesium alloy is effectively refined, magnesium and the magnesium alloy are strengthened, and the comprehensive mechanical property of the magnesium alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of production and processing of magnesium alloy materials, and in particular relates to a vanadium-containing magnesium master alloy grain refiner and a preparation method and application thereof. Background technique [0002] Magnesium and magnesium alloys are favored by more and more people due to their low density, high specific strength and specific stiffness, good damping performance, excellent casting performance and easy cutting processability, and are expected to be used in transportation, aerospace and Electronic products and other industrial fields have a wide range of applications. However, the room temperature strength and toughness of magnesium and its alloys are low, and their creep resistance and corrosion resistance are poor, which limits their development. Grain refinement is an important means to improve the comprehensive properties of magnesium and its alloys. [0003] Adding grain refin...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C23/00C22C32/00C22C1/10
CPCC22C1/03C22C1/1015C22C1/1036C22C23/00C22C32/0047C22C1/1047
Inventor 姜中涛姜山刘兵敬小龙邓永强
Owner CHONGQING UNIV OF ARTS & SCI
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