Method for preparing magnesium oxide whisker/ magnesium composite powder by in-situ growth on surface of magnesium powder

A magnesium oxide whisker and composite powder technology, which is applied in the field of ceramic whisker/metal composite powder materials, can solve the problems that cannot be prepared by growing magnesium-based composite materials, unfavorable large-scale production, high raw material costs, etc., and achieve continuity and combination Good performance, uniform size, good dispersion effect

Inactive Publication Date: 2013-04-03
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods use high raw material costs and complicated operations, which are not conducive to large-scale production, and the preparation temperature of magnesium oxide whiskers is often as high as 1000 ° C, which cannot be used for the preparation of in-situ growth magnesium matrix composites.
However, using the pretreatment method to produce MgO whiskers with good crystallinity inside the Mg matrix, whose growth temperature is suitable for combining with the Mg matrix, is expected to further produce Mg matrix composites with good interfacial bonding and excellent performance. There is no literature report yet

Method used

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  • Method for preparing magnesium oxide whisker/ magnesium composite powder by in-situ growth on surface of magnesium powder
  • Method for preparing magnesium oxide whisker/ magnesium composite powder by in-situ growth on surface of magnesium powder

Examples

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Effect test

Embodiment 1

[0015] Place a 250 ml flask containing 10 g of boric acid powder in an ultrasonic oscillator at a water temperature of 30-50 °C, dissolve boric acid with 180 ml of absolute ethanol, add 10 g of magnesium powder, and stir at a constant temperature of 40 °C using a magnetic stirrer After 5 h, the samples were taken out and dried to obtain prefabricated mixed powder after the complete evaporation of absolute ethanol. Spread the prefabricated mixed powder in the quartz ark, and place the quartz ark in the constant temperature zone of the vacuum tube heating furnace. Firstly, protective argon gas is introduced into the tube furnace, and then the heating rate is increased to 650 °C for calcination at a rate of 5 °C / min, and the whisker is grown at a heat preservation rate of 2 hours. Magnesium whisker / magnesium composite powder product.

Embodiment 2

[0017] Place a 250 ml flask containing 10 g of boric acid powder in an ultrasonic oscillator at a water temperature of 30-50 °C, dissolve boric acid with 180 ml of absolute ethanol, add 15 g of magnesium powder, and stir for 4 hours at a constant temperature of 50 °C using a magnetic stirrer , after the complete evaporation of absolute ethanol, the sample was taken out and dried to obtain a prefabricated mixed powder. Spread the prefabricated mixed powder in the quartz ark, and place the quartz ark in the constant temperature zone in the middle of the vacuum tube furnace. First, protect the tube furnace with argon gas, and then raise the temperature to 700 °C at a rate of 10 °C / min. Calcination, heat preservation for 2 hours to grow whiskers, and naturally lower the furnace temperature to room temperature under the protection of argon to obtain a magnesium oxide whisker / magnesium composite powder product.

Embodiment 3

[0019] Place a 250 ml flask containing 10 g of boric acid powder in an ultrasonic oscillator with a water temperature of 30-50 °C, dissolve boric acid with 180 ml of absolute ethanol, add 20 g of magnesium powder, and stir at a constant temperature of 60 °C for 3 h using a magnetic stirrer , after the complete evaporation of absolute ethanol, the sample was taken out and dried to obtain a prefabricated mixed powder. Spread the prefabricated mixed powder in the quartz ark, place the quartz ark in the constant temperature zone in the middle of the vacuum tube furnace, first pass protective argon into the tube furnace, and then raise the temperature to 750 °C for calcination at a rate of 10 °C / min , heat preservation for 2 hours to grow whiskers, and the furnace temperature was naturally lowered to room temperature under the protection of argon to obtain a magnesium oxide whisker / magnesium composite powder product.

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Abstract

The invention discloses a method for preparing a magnesium oxide whisker / magnesium composite powder by in-situ growth on the surface of magnesium powder, which belongs to the technology of a ceramic whisker / a metal composite powder material. The method comprises the steps of: first, dissolving boric acid adequately with an appropriate amount of absolute ethyl alcohol, then, dispersing magnesium powder with mass ratio of 1-3 with boric acid in the boric acid and ethanol solution, agitating at a constant temperature by a magnetic agitator, and taking out the sample and drying to obtain pre-mixed powder after completely evaporating absolute ethyl alcohol; paving the pre-mixed powder in a quartz ark and placing the quartz ark in a constant temperature area of a vacuum tubular heating furnace; and calcining at 650-800 DEG C under protection of argon to prepare the magnesium oxide whisker / magnesium composite powder. The method has the advantages that the process is simple and easy for realizing production in a large scale; magnesium oxide whiskers growing on a magnesium powder substrate are uniform in size and good in bonding performance with the magnesium powder substrate.

Description

technical field [0001] The invention relates to a method for preparing magnesium oxide whisker / magnesium composite powder by in-situ growth on the surface of magnesium powder, which belongs to ceramic whisker / metal composite powder material technology. Background technique [0002] Magnesium metal is the third type of metal structural material developed after steel and aluminum alloy. Because of its many advantages such as high damping, low density, high specific strength, good casting performance and recyclable recycling, it has become the most widely used material nowadays. One of the most popular materials, and known as the 21st century green engineering materials. With the development of material composite technology and the improvement of the performance of magnesium-based composite materials, the application prospects of magnesium metal in transportation, communication electronics, portable tools, aerospace, military industry and other fields will be broader. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C30B29/16C30B29/62C30B1/00
Inventor 陈善华李建强
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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