Novel flame-retardant high-strength heat-resistant magnesium alloy and preparation thereof

A magnesium alloy and high-strength technology, which is applied in the field of new flame-retardant, high-strength and heat-resistant magnesium alloys and their preparation, can solve the problems of single ignition point of the alloy, lack of flame retardant materials, strengthening and heat resistance, and limiting the application of magnesium alloys, and achieve performance improvement. , the effect of improving mechanical properties and improving ignition point

Active Publication Date: 2009-03-04
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Judging from the research outbreaks that have been carried out so far, many alloys are often aimed solely at improving the ignition point, or improving material strength or heat resistance, etc., and lack of research and development work that comprehensively improves the properties of materials such as flame retardancy, strengthening and heat resistance, which limits the development of magnesium alloys. Alloy application

Method used

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  • Novel flame-retardant high-strength heat-resistant magnesium alloy and preparation thereof
  • Novel flame-retardant high-strength heat-resistant magnesium alloy and preparation thereof

Examples

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Effect test

Embodiment 1

[0017] Preheat the smelting crucible to dark red, put 1Kg of AZ91D alloy and 270g of pure magnesium and other raw materials at 500℃, and pass in 99.2vol.% CO 2 +0.8vol.% SF 6 Mix the protective gas, and after the AZ91D alloy and pure magnesium (balance the excess Al caused by the addition of the master alloy) are melted, the temperature is increased to 740°C and the Al-50wt.%Ca master alloy 8g and Al- preheated to 200°C are added respectively. 26g of 10wt.% RE master alloy, 6g of Al-10wt.% Sr master alloy, and then cooled to 700°C for mechanical stirring, refining and slagging, standing for 10 minutes and then casting to obtain AZ91D+0.3wt.%Ca+0.2 wt.% RE+0.05wt.% Sr alloy. figure 1 The light microscope and scanning electron microscope photos of the alloy organization. Tests show that the alloy has an ignition point of 740°C, a hardness of HB 72, a room temperature tensile strength of 172MPa, a 150°C tensile strength of 159MPa, and a 250°C tensile strength of 136MPa.

Embodiment 2

[0019] The specific test procedure is the same as that of specific example 1, in which 1Kg of AZ91D alloy and 800g of pure magnesium are first added, and the added master alloys are 38g of Al-50wt.%Ca master alloy, 95g of Al-20wt.%RE master alloy, and Al-10wt. .% Sr master alloy 19g. The AZ91D+1.0wt.%Ca+0.8wt.%RE+0.1wt.%Sr alloy was prepared. figure 2 The light microscope and scanning electron microscope photos of the alloy organization. Tests show that the alloy has a ignition point of 866°C, a hardness of HB86, a room temperature tensile strength of 211MPa, a 150°C tensile strength of 183MPa, and a 250°C tensile strength of 156MPa.

Embodiment 3

[0021] The specific test procedure is the same as that of specific example 1, in which 1Kg of AZ91D alloy and 400g of pure magnesium are first added, and the added master alloys are 15g of Al-50wt.%Ca master alloy, 37g of Al-20wt.%RE master alloy, and Al-10wt. .% Sr master alloy 23g. The AZ91D+0.5wt.%Ca+0.5wt.%RE+0.15wt.%Sr alloy was prepared. Tests show that the alloy has an ignition point of 786°C, a hardness of HB 90, a room temperature tensile strength of 212MPa, a 150°C tensile strength of 180MPa, and a 250°C tensile strength of 158MPa.

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Abstract

The invention relates to a novel retardant high-strength heat resistant magnesium alloy and a preparation method thereof. The preparation method comprises the following steps: calcium, rare earth and strontium are added into a magnesium alloy together; while the burning point of the magnesium alloy is improved, the issue of the magnesium alloy is improved by alloying, the grain size is refined, and the mechanical properties and heat resistance of the magnesium alloy are improved. The preparation of the alloy is realized by the following technical proposal: an Al-Ca intermediate alloy, an Al-RE intermediate alloy and an Al-Sr intermediate alloy are added into the melted magnesium alloy AZ91D; and then, alloy elements are evenly scattered in the magnesium alloy flux through a mechanical or electromagnetic stirring method; the flux is placed stationarily, cast and shaped in a metal mould, to obtain the novel retardant high-strength heat resistant magnesium alloy.

Description

Technical field [0001] The patent relates to a novel flame-retardant high-strength heat-resistant magnesium alloy and a preparation method thereof, in particular to a method for preparing a flame-retardant high-strength heat-resistant magnesium alloy by ternary composite alloying of calcium, rare earth and strontium. Background technique [0002] The density of magnesium alloy is 1.75~1.85g / cm 3 It is only 2 / 3 of aluminum alloy and about 1 / 4 of steel. At the same time, magnesium alloy has high specific strength, specific rigidity and excellent antimagnetic, electrical conductivity, thermal conductivity and hot and cold processing properties. It can be recycled and used, and is known as "Green metal in the 21st century" has been favored by industries such as aerospace and electronic communications, and has become one of the most promising metal structural materials. [0003] The biggest disadvantage of magnesium alloy is that it is easy to oxidize and burn during the melting and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03
Inventor 赵玉涛陈刚薛喜才张松利
Owner JIANGSU UNIV
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