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Method for in situ preparing TiC granule reinforced magnesium base composite material

A particle-enhanced, in-situ preparation technology, applied in the field of composite materials, can solve the problems of severe reaction and difficult process control, and achieve the effects of low preparation cost, superior physical and mechanical properties, and controllable particle size.

Inactive Publication Date: 2008-07-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prefabricated block is directly added to the magnesium melt and the reaction is violent. Magnesium is easy to burn and oxidize to introduce impurities at high temperatures. Therefore, the above-mentioned in-situ particle reinforced magnesium-based composite material process is not easy to control, and there are certain limitations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Al powder (100 μm), Ti powder (75 μm) and C powder (85 μm) are used as prefabricated block raw materials, the content of Al powder is 50wt% of the total powder, and the balance is: Ti powder and C powder. The atomic ratio of Ti and C is 1.2. The above-mentioned powder was ball milled for 12 hours at a rotation speed of 500 r / min and a ball-to-material ratio of 50:1. The ball-milled powder is pressed into a prefabricated block, and the compactness rate of the prefabricated block is 95% of the theoretical density. The prefabricated block and pure magnesium obtained by pressing are placed in a vacuum heating device, and an inert gas is introduced into the reaction chamber after being evacuated, heated to 750° C., and kept for 1 hour. Then the obtained melt was stirred at 750° C. with a stirring speed of 500 r / min. After stirring for 30 minutes, stand still and pour. A TiC-reinforced magnesium-based composite material with a mass percentage of 15% was prepared. The tens...

Embodiment 2

[0027] Ti powder (25 μm) and C powder (1 μm) were used as prefabricated block raw materials. The atomic ratio of Ti and C is 1. The above powder was ball milled for 0.5 hour at a rotational speed of 100 r / min and a ball-to-material ratio of 1:1. The ball-milled powder is pressed into a prefabricated block, and the compactness rate of the prefabricated block is 85% of the theoretical density. The pressed prefabricated block and AZ91 magnesium alloy are placed in a vacuum heating device, the reaction chamber is evacuated and inert gas is introduced, heated to 900° C., and kept for 2 hours. Then the obtained melt was stirred at 650° C., and the stirring speed was 1000 r / min. After stirring for 10 minutes, stand still and pour. Prepare 8wt% TiC reinforced AZ91 magnesium matrix composite. The tensile strength of the material is 313MPa.

Embodiment 3

[0029] Al powder (1 μm), Ti powder (50 μm) and C powder (10 μm) are used as prefabricated block raw materials, the content of Al powder is 35wt% of the total powder, and the balance is: Ti powder and C powder. The atomic ratio of Ti and C is 0.8. The above powder was ball milled for 5 hours at a rotational speed of 300 r / min and a ball-to-material ratio of 10:1. The ball-milled powder is pressed into a prefabricated block, and the compactness rate of the prefabricated block is 70% of the theoretical density. The prefabricated block obtained by pressing and the ZM5 magnesium alloy are placed in a vacuum heating device, and the reaction chamber is vacuumed and then inert gas is introduced, heated to 800° C., and kept for 0.5 hours. Then the obtained melt was stirred at 700° C. with a stirring speed of 200 r / min. After stirring for 60 minutes, stand still and pour. The TiC-reinforced ZM5 magnesium-based composite material with a mass percentage of 5% was prepared. The tensile...

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Abstract

The invention discloses a method for preparing TiC particle reinforced magnesium base composite material in-situ in the technical field of compound material. The steps are as follows: preparing and mixing Al powder, Ti powder and C powder; the content of the Al powder is 0 wt to 50wt percent of the gross and the atom ratio of Ti atom to C atom is between 0.8 to 1.2; carrying through ball milling on the prepared and mixed powder and pressing the powder after ball milling into a precast block; arranging the pressed precast block and a Mg alloy pig into a vacuum heating device; pumping inert gases into a reaction chamber after vacuumized; heating, maintaining the temperature; mixing a fused mass after reaction, and then standing and casting to form after mixing. The technique of the invention is relatively simple and has a low cost. The TiC particle reinforced magnesium base composite material in-situ prepared has the advantages of petty particles of reinforced phase, uniform distribution, excellent combination with a basic body interface, light weight, high intensity and high mold quantity, etc.

Description

technical field [0001] The invention relates to a preparation method in the technical field of composite materials, in particular to a method for in-situ preparation of TiC particle-reinforced magnesium-based composite materials. Background technique [0002] Magnesium-based composite materials have low density, high specific strength and specific stiffness, and excellent mechanical and physical properties. They have greater application potential than traditional metal materials and aluminum-based composite materials in emerging high-tech fields. Therefore, since the 1980s At the end of the 1990s, magnesium-based composites have become one of the research hotspots in the field of metal-matrix composites. In the past, a large amount of research work on this material was mainly aimed at the needs of national defense and aerospace applications. With the research and development of new manufacturing processes, magnesium-based composite materials have been more widely used in aut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/00C22C11/02C22C23/00
Inventor 张荻曹玮范同祥张从发
Owner SHANGHAI JIAO TONG UNIV
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