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Method for preparing Cr2O3 coated aluminum borate whisker reinforced aluminum matrix composites

A technology of aluminum matrix composite materials and aluminum borate whiskers, which is applied in the field of preparation of whisker-reinforced aluminum matrix composite materials, can solve problems such as inability to use in high temperature environments and poor mechanical properties, and achieve high temperature interface stability and extension The effect of increasing the rate and improving the wettability of the interface

Inactive Publication Date: 2011-05-25
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the defects such as poor mechanical properties and inability to be used in high temperature environment in current aluminum borate whisker-reinforced aluminum-based composite materials, and provides a Cr 2 o 3 Preparation method of coated aluminum borate whisker reinforced aluminum matrix composite

Method used

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  • Method for preparing Cr2O3 coated aluminum borate whisker reinforced aluminum matrix composites
  • Method for preparing Cr2O3 coated aluminum borate whisker reinforced aluminum matrix composites
  • Method for preparing Cr2O3 coated aluminum borate whisker reinforced aluminum matrix composites

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specific Embodiment approach 1

[0018] Specific implementation mode one: this implementation mode Cr 2 o 3 Coating aluminum borate whisker-reinforced aluminum matrix composites is carried out as follows:

[0019] 1. Chromium nitrate and citric acid are added to distilled water at a molar ratio of 1:1, then magnetically stirred and heated to reflux for 1 to 2 hours to obtain transparent Cr 2 o 3 Sol;

[0020] 2. Add aluminum borate whiskers to Cr 2 o 3 sol and dispersed by ultrasonic waves, and then dried to obtain Cr 2 o 3 Gel-coated aluminum borate whiskers;

[0021] Three, the Cr 2 o 3 The gel-coated aluminum borate whiskers are baked in an environment of 400-600°C for 1-2 hours to produce Cr 2 o 3 The coated aluminum borate whiskers are put into water for ultrasonic dispersion for 1-2 hours;

[0022] 4. The Cr that has been ultrasonically dispersed in Step 3 is molded by compression molding. 2 o 3 The coated aluminum borate whiskers are made into preforms, then dried at room temperature, and...

specific Embodiment approach 2

[0026] Embodiment 2: The differences between this embodiment and Embodiment 1 are: in step 2, the ultrasonic dispersion time is 1-3 hours, the ultrasonic power is 1000-2000 W, and the ultrasonic frequency is 50-80 Hz. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0027] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: Cr in step five 2 o 3 The coated aluminum borate whisker preform accounts for 12% to 28% of the total volume of the aluminum matrix composite material. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing Cr2O3 coated aluminum borate whisker reinforced aluminum matrix composites, which relates to a method for preparing whisker reinforced aluminum matrix composites. The method overcomes the defects of poor mechanical properties and failure of use in high-temperature environment existing in the prior aluminum borate whisker reinforced aluminum matrix composites. The method comprises the steps of: 1, preparation of Cr2O3 sol; 2, preparation of Cr2O3 gel coated aluminum borate whiskers; 3, preparation of Cr2O3 coated aluminum borate whisker performed unit; and 4, preparation of the Cr2O3 coated aluminum borate whisker reinforced aluminum matrix composites by adopting a squeeze casting process. The method can be used for the whisker reinforced aluminum matrix composites.

Description

technical field [0001] The invention relates to a preparation method of a whisker-reinforced aluminum-based composite material. Background technique [0002] As a new type of engineering material, composite materials have attracted great attention from material researchers from all over the world, and have great development advantages. Aluminum matrix composites not only maintain excellent material properties, but also can compete with traditional metal materials in price. [0003] Whisker-reinforced aluminum matrix composites have a series of advantages such as isotropy and easy processing and deformation, and can be processed by existing metal material processing methods and equipment as well as traditional processing and forming methods. At present, SiC whiskers and Si 3 N 4 Whiskers and other reinforced aluminum matrix composites, due to SiC whiskers and Si 3 N 4 Whiskers are expensive, which limits the wide application of whisker-reinforced aluminum matrix composit...

Claims

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Application Information

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IPC IPC(8): C22C47/04C22C47/06C22C49/06C22C49/14C22C101/06C22C121/02
Inventor 岳红彦黄硕郭二军王丽萍俞泽民
Owner HARBIN UNIV OF SCI & TECH
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