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Method for preparing Mg2Si/Mg composites by recovered silicon powder

A composite material and silicon powder technology, which is applied in the field of material preparation, can solve the problem of high cost of reinforced magnesium-based composite materials, and achieve the effects of enhancing the reuse value, being beneficial to environmental protection, and having a simple preparation method.

Inactive Publication Date: 2012-06-27
INNER MONGOLIA 52 SPECIAL MATERIAL ENG TECH RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Mg 2 Si-reinforced magnesium-based composites are one of the first-choice materials for automobile engines. There are currently two main technical difficulties: (1) Mg 2 High cost of Si-reinforced Mg-based composites: how to reduce Mg 2 The cost of Si-reinforced magnesium-based composites is one of the key factors restricting its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The magnesium alloy is AZ91D magnesium alloy, the silicon powder is industrial dust silicon powder, and the content of silicon dioxide is 70%. The composite material is prepared in a pit type resistance furnace, using SF 6 +CO 2 Mixed gas shield with 10% SF 6 and 90% CO 2 , the crucible is a steel crucible.

[0025] Mg 2 The preparation method of Si / Mg composites is as follows:

[0026] (a), put the crucible required for the experiment into drying oven, and the temperature of oven is set to 400 ℃;

[0027] (b), put 340g of AZ91D magnesium alloy into the pit furnace and heat, while feeding in protective gas, heating for 2.5 hours to 950 ℃ to melt the magnesium alloy, and scrape the surface impurities with a steel spoon;

[0028] (c) Put the industrial dust silicon powder into the water, remove the floating objects on the water surface, then filter the water, put it into a drying oven with a temperature of 70 ° C for drying, and wrap 11.05g of the silicon powder with...

Embodiment 2

[0033] The magnesium alloy is AZ91D magnesium alloy, the silicon powder is industrial dust silicon powder, and the content of silicon dioxide is 72%. The composite material is prepared in a pit type resistance furnace, using SF 6 +CO 2 Mixed gas shield with 10% SF 6 and 90% CO 2 , the crucible is a steel crucible.

[0034] Mg 2 The preparation method of Si / Mg composites is as follows:

[0035] (a), put the crucible required for the experiment into drying oven, and the temperature of oven is set to 300 ℃;

[0036] (b), put 380g of AZ91D magnesium alloy into the pit furnace for heating, and simultaneously feed protective gas, heat for 2 hours to 850 ° C to melt the magnesium alloy, and scrape off the surface impurities with a steel spoon;

[0037] (c) Put the industrial dust silicon powder into the water to remove the floating objects on the water surface, then filter the water, put it into a drying box, dry it at 75°C, and wrap 18.66g of silicon powder with aluminum foil a...

Embodiment 3

[0042] The magnesium alloy is AZ91D magnesium alloy, the silicon powder is industrial dust silicon powder, and the content of silicon dioxide is about 74%. The composite material is prepared in a pit type resistance furnace, using SF 6 +CO 2 Mixed gas shield with 10% SF 6 and 90% CO 2 , the crucible is a steel crucible.

[0043] Mg 2 The preparation method of Si / Mg composites is as follows:

[0044] (a), put the crucible required for the experiment into drying oven, and the temperature of oven is set to 200 ℃;

[0045] (b), put 300g of AZ91D magnesium alloy into the pit furnace for heating, and simultaneously feed the protective gas, heat for 1 hour to 750 ℃ ​​to melt the magnesium alloy, and scrape off the surface impurities with a steel spoon;

[0046] (c) Put the industrial dust silicon powder into the water to remove the floating objects on the water surface, then filter the water, put it into a drying oven with a temperature of 80 ° C for drying, and wrap 6.91g of th...

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Abstract

The invention relates to a method for preparing Mg2Si / Mg composites by recovered silicon powder, which is characterized by including steps of drying a crucible required by experiment into a drying oven, adding magnesium alloy into a pit furnace for heating, injecting SF6+CO2 mixed protection gas and heating to the temperature ranging from 750 DEG C to 1100 DEG C for 1 to 3 hours until the magnesium alloy is melted; adding industrial dust silicon powder with 70% to 75% of silicon dioxide into water, adding the silicon powder, which is 2.5-7.5wt% of the magnesium alloy and wrapped by aluminum foil, into the magnesium alloy melt, ; mixing so that the magnesium alloy and the silicon powder can be reacted sufficiently; modifying, cooling naturally, then pouring the melt to a preheated metal mold with the preheating temperature ranging from 100 DEG C to 400 DEG C. During the integral mixing and casting process, protection gas must be injected continuously, and accordingly the Mg2Si / Mg composites are prepared. The industrial dust silicon powder is used as a silicon source and in-situ chemical reaction of the magnesium and the silicon powder is realized by means of mixing and casting. Themethod for preparing Mg2Si / Mg composites is simple in process and low in preparation cost, and the prepared Mg2Si / Mg composites are excellent in performances.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to the comprehensive utilization of silicon powder to prepare Mg 2 Si / Mg composites. Background technique [0002] The production of iron and magnesium requires a large amount of ferrosilicon. The dust produced by the production of ferrosilicon is called silicon powder in the industry. The main component is silicon dioxide. Recycling and resource utilization are of great significance. Silica in silicon powder is an amorphous substance with high activity, small particles, large specific surface area, and excellent physical and chemical properties. Therefore, many countries in the world reuse silicon powder. A lot of research has been done. As early as 1947, Norway's ElkemASA began to carry out research on the production technology, dust treatment, classification and application of micro-silica fume, becoming the first enterprise in the world to develop micro-silica fume ...

Claims

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Application Information

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IPC IPC(8): C22C32/00C22C23/00C22C1/02
Inventor 高平杨春霞狄石磊张文波郭永亮邸建辉张建华李进军王强
Owner INNER MONGOLIA 52 SPECIAL MATERIAL ENG TECH RES CENT
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