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Preparation method of in-situ ZrB2 particle reinforced magnesium-based composite

A composite material and particle reinforcement technology is applied in the field of in-situ ZrB2 particle reinforced magnesium matrix composite material preparation to achieve uniform macroscopic distribution.

Inactive Publication Date: 2013-05-22
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is currently used to prepare ZrB 2 Particulate-reinforced magnesium-based composites have not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0007] Example 1: Converting an industrial KBF 4 and K 2 ZrF 6 (Zr:B=1:2.2) The powder was baked at 200°C for 8h to remove the water of crystallization; then the KBF 4 and K 2 ZrF 6 The powder is fully mixed on the mixer for 24 hours; put the preheated 200°C industrial pure aluminum ingot into the graphite crucible, heat it to 850°C with a resistance furnace, and then put the KBF 4 and K 2 ZrF 6 The powder is pressed into the aluminum melt through the bell jar in batches to prepare Al-ZrB with a volume fraction of 20% 2 The master alloy is spare. Put 200 g of pure magnesium into the crucible under CO 2 +SF 6 Heated to 720°C under the protection of mixed gas, and then preheated to 200°C with a volume fraction of 20% Al-ZrB 2 Add 5% of the master alloy into the molten melt, raise the temperature to 740°C, and at the same time, apply a power of 400W high-energy ultrasonic to the melt, let it stand for 15 minutes, remove slag, refine, and cast it into a metal mold at 710...

example 2

[0008] Example 2: Converting industrial KBF 4 and K 2 ZrF 6 (Zr:B=1:2.2) The powder was baked at 200°C for 8h to remove the water of crystallization; then the KBF 4 and K 2 ZrF 6 The powder is fully mixed on the mixer for 24 hours; put the preheated 200°C industrial pure aluminum ingot into the graphite crucible, heat it to 850°C with a resistance furnace, and then put the KBF 4 and K 2 ZrF 6 The powder is pressed into the aluminum melt through the bell jar in batches to prepare Al-ZrB with a volume fraction of 25% 2 The master alloy is spare. Put 200 g of pure magnesium into the crucible under CO 2 +SF 6 Heated to 720°C under the protection of mixed gas, and then preheated to 200°C with a volume fraction of 25% Al-ZrB 2 Add 10% of the master alloy into the molten melt, raise the temperature to 760°C, and at the same time, apply a power of 800W high-energy ultrasonic to the melt, let it stand for 10 minutes, remove slag, refine, and cast it into a metal mold at 710°C...

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Abstract

The invention discloses a preparation method of an in-situ ZrB2 particle reinforced magnesium-based composite. The key of the preparation method is preparation of the ZrB2 particle reinforced magnesium-based composite in situ. The preparation method of the magnesium-based composite comprises the following steps: adding 15-25vol.% Al-ZrB2 intermediate alloy in the smelting process of pure magnesium and applying high-energy ultrasound on the melt. The Al-ZrB2 intermediate alloy is prepared by a reaction system of Al, KBF4 and K2ZrF6; as the prices of KBF4 and K2ZrF6 are low, the production costof the magnesium-based composite can not be increased; and the technology is simple, safe and reliable, is convenient to operate and has no three-waste pollution. The preparation method has the following technical effects: compared with the traditional Mg-Al series alloy material AM60, the second phase Mg17Al12 of the prepared ZrB2 particle reinforced magnesium-based composite changes from continuous netted pages to granules or short blocks, the reinforced phase is dispersed and distributed in the magnesium matrix and the macroscopic distribution is uniform.

Description

technical field [0001] an in situ ZrB 2 A method for preparing a particle-reinforced magnesium-based composite material. Background technique [0002] When the metal matrix composite is prepared by the in-situ endogenous method, the reinforcement nucleates and grows in situ in the metal matrix, which has good thermal stability, the surface of the reinforcement is clean and pollution-free, and the interface compatibility with the matrix is ​​good. The advantages of high strength have become the main direction of research and development of magnesium-based composite materials in the 21st century. At the same time, high-energy ultrasound is applied during the smelting process of magnesium alloys, and the acoustic cavitation effect and acoustic flow effect generated during ultrasonic treatment of the melt can make the generated particles dispersed in the matrix, and at the same time change the size and size of the reinforcement and the second phase. shape. Therefore, the comb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/10C22C23/02
Inventor 闫洪黄文先
Owner NANCHANG UNIV