Method for preparing aluminum-based in-situ composite materials at low temperature in presence of catalysts

An in-situ composite material and low-temperature catalysis technology, which is applied in the field of low-temperature catalysis preparation, can solve the problems of deepening the harm of fluoride salts to the human body and the environment, affecting the particle yield, reducing the reaction temperature, etc. less effect

Inactive Publication Date: 2010-11-24
JIANGSU UNIV
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Problems solved by technology

[0009] 2. Require longer reaction time
Its shortcomings are: the added fluorine salt fluxing components will further increase the harm of fluorine salt to the human body and the environment, and the added fluoride salt will partially react with the reaction salt, resulting in partial reaction salt failure and affecting the particle yield; Two, for some high melting point reaction salts, such as some carbonates, the added flux cannot make it change from solid to liquid at the reaction temperature, and the effect of lowering the reaction temperature is not obvious

Method used

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  • Method for preparing aluminum-based in-situ composite materials at low temperature in presence of catalysts
  • Method for preparing aluminum-based in-situ composite materials at low temperature in presence of catalysts
  • Method for preparing aluminum-based in-situ composite materials at low temperature in presence of catalysts

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Effect test

Embodiment 1

[0032] Embodiment 1: TiB 2 Low-temperature catalytic preparation of carbon nanotubes for particle-reinforced aluminum matrix composites

[0033] Potassium fluorotitanate K 2 TiF 6 and potassium fluoroborate KBF 4 As a reactive salt, TiB was prepared by the mixed salt reaction method 2 Particle reinforced aluminum matrix composites. Use a bell jar to add the preheated mixed salt powder into the high-temperature melt in batches, and stir thoroughly to ensure that the powder is fully in contact with the melt. When no catalyst is added, the optimized synthesis temperature is 870-900°C, the suitable reaction time is 25-30min, and the prepared composite structure is as follows: figure 1 shown.

[0034] The carbon nanotubes with 1.2wt.% of the salt mass are mixed into the mixed salt. Then the in-situ reaction can be completed at 820-830°C, and the reaction time can be shortened to 10-15min. The prepared composite structure is as follows: figure 2 shown, with figure 1 Organi...

Embodiment 2

[0036] Example 2 ZrB 2 Low-temperature Catalytic Preparation of Artificial Graphite for Particle Reinforced Aluminum Matrix Composites

[0037] Potassium fluozirconate K 2 ZrF 6 and potassium fluoroborate KBF 4 As a reactive salt, ZrB was prepared by the mixed salt reaction method 2Particle reinforced aluminum matrix composites. Use a bell jar to add the preheated mixed salt powder into the high-temperature melt in batches, and stir thoroughly to ensure that the powder is fully in contact with the melt. When no catalyst is added, the optimized synthesis temperature is 880-900°C, the suitable reaction time is 20-25min, and the prepared composite structure is as follows: image 3 shown.

[0038] Add the artificial graphite powder of salt quality 2wt.% in mixed salt. Then the in-situ reaction can be completed at 830-840°C, the reaction time can be shortened to 10min, and the prepared composite structure is as follows: Figure 4 shown, with image 3 Organizations did not ...

Embodiment 3

[0040] Example 3 ZrB 2 Cryolite Catalytic Preparation of Particle Reinforced Aluminum Matrix Composites at Low Temperature

[0041] Potassium fluozirconate K 2 ZrF 6 and potassium fluoroborate KBF 4 As a reactive salt, ZrB was prepared by the mixed salt reaction method 2 Particle reinforced aluminum matrix composites. Use a bell jar to add the preheated mixed salt powder into the high-temperature melt in batches, and stir thoroughly to ensure that the powder is fully in contact with the melt. When no catalyst is added, the optimized synthesis temperature is 880-900°C, the suitable reaction time is 20-25min, and the prepared composite structure is as follows: image 3 shown.

[0042] The mixed salt is mixed with 3wt.% aluminum-magnesium spinel of the salt mass. Then the in-situ reaction can be completed at 830°C, and the reaction time can be shortened to 10 minutes. The prepared composite structure is as follows: Figure 5 shown, with image 3 Organizations did not dif...

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Abstract

The invention belongs to the technical field of material preparation and particularly provides a method for preparing aluminum-based composite materials at low temperature in the presence of catalysts. In the method, catalysts added to the salts used in the reaction for preparing the composite materials can enable the salts used in the reaction and aluminum melt to conduct the in-situ reaction under the condition that the reaction temperature is lower than the conventional synthesis temperature, increase the reaction rate, shorten the reaction time and ensure that the microstructure characteristics of the composite materials, including the type, dimensions and distribution of particles are unchanged. Therefore, the method of the invention is suitable for the preparation of aluminum-based composite materials on an industrial scale.

Description

technical field [0001] The invention relates to the technical field of preparation of metal-based composite materials, and aims at realizing the low-temperature catalytic preparation of aluminum-based composite materials by adding a catalyst to a reaction mixed salt. Background technique [0002] Aluminum matrix composites combine the advantages of aluminum matrix and reinforcing phase, and have excellent properties such as high specific strength, specific stiffness, and high wear resistance, and are an important part of new material research and development. From the perspective of particle introduction methods, there are two types: external and endogenous. Endogenous particles have the advantages of clean interface and small particle size. Correspondingly, many in-situ endogenous methods have been derived. Among them, the melt direct reaction method is to add the reaction salt powder containing granular elements to the aluminum / aluminum alloy melt at the synthesis temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C32/00C22C1/02
Inventor 李桂荣王宏明赵玉涛
Owner JIANGSU UNIV
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