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Method for preparing two-phase granular mixed reinforced magnesium alloy based composite material

A technology for strengthening magnesium alloys and composite materials, which is applied in the field of preparation of magnesium alloy-based composite materials, can solve the problems of composite material performance degradation, TiC hardness decrease, etc., and achieve the effect of fine particle size, uniform distribution and good wettability

Inactive Publication Date: 2004-01-28
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, TiC in the composite materials prepared by the above process often exists in the form of C vacancy, and the hardness of TiC in the vacancy form decreases, which cannot fully exert its reinforcing effect; and if the process is not properly controlled during the preparation process, it is easy to form a brittle phase TiAl 3 , resulting in a decrease in the performance of the composite

Method used

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  • Method for preparing two-phase granular mixed reinforced magnesium alloy based composite material
  • Method for preparing two-phase granular mixed reinforced magnesium alloy based composite material
  • Method for preparing two-phase granular mixed reinforced magnesium alloy based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare 10% (TiB 2 +TiC) / AZ91 composite material

[0031] Al powder of ~29 microns, Ti powder of ~15 microns, B powder of ~3 microns and C powder of ~38 microns are taken, and AZ91 ingot, pure magnesium ingot, pure zinc, and Al-Mn master alloy are used as ingredients for the matrix magnesium alloy. The above four kinds of powders are prepared according to the ratio of Al content of 40% by weight, atomic ratio (B+C): Ti=3.0, and atomic ratio B:Ti=2, and weight ratio of B+Ti to 50%. Mix in a ball mill for 8 hours, then press on a 20-ton press to form a cylindrical reaction prefabricated block of φ55×30, and the compaction rate of the compact is 75% of the theoretical density of the mixed powder. The reaction prefabricated block was placed in a vacuum heating device, and the temperature was raised to 680 °C at a heating rate of 10 °C / min to initiate a chemical synthesis reaction, and the product was (50% TiB 2 +10%TiC) / 40%Al mesophase carrier, its microscopic scanning st...

Embodiment 2

[0033] Prepare 15% (TiC+TiB 2 ) / ZM5 composite material

[0034]Al powder of ~74 microns, Ti powder of ~25 microns, B powder of ~3 microns and C powder of ~74 microns are taken, and the matrix magnesium alloy adopts ZM5 ingot, pure magnesium ingot Al-Mn master alloy and pure zinc as ingredients. The above four kinds of powders are 60% by weight percentage of Al content, atomic ratio (B+C): Ti=3.1, and atomic ratio B:Ti=2, weight ratio B+Ti is 10%, in the drum type small ball mill Mix for 24 hours, and then press into a cylindrical reaction prefabricated block of φ55×30, and the compaction rate of the compact is 82% of the theoretical density of the mixed powder. The reaction prefabricated block was placed in a heating device protected by high-purity argon, and the temperature was raised to 765°C at a heating rate of 25°C / min to initiate a chemical synthesis reaction to obtain (30%TiC+10%TiB 2 ) / 60%Al mesophase support, and then this contains the corresponding TiC and TiB 2 T...

Embodiment 3

[0036] Prepare 5% (TiB 2 +TiC) / AZ91 composite material

[0037] Al powder of ~29 microns, Ti powder of ~15 microns, B powder of ~3 microns, and C powder of ~38 microns are taken, and the matrix magnesium alloy is prepared by using AZ91HP ingot, pure magnesium ingot, Al-Mn master alloy and pure zinc. The above four kinds of powders are prepared according to the ratio of Al content of 50% by weight, atomic ratio (B+C): Ti=3, and atomic ratio B:Ti=2, and weight ratio of B+Ti to 25%. Mix in a ball mill for 16 hours, then press on a 20-ton press to form a cylindrical reaction prefabricated block of φ55×30, and the compaction rate of the compact is 75% of the theoretical density of the mixed powder. The reaction prefabricated block is placed in a vacuum heating device, and the temperature is raised to 640 °C at a heating rate of 18 °C / min to initiate a chemical synthesis reaction, and the product is (25% TiB 2 +25%TiC) / 50%Al mesophase support, its microscopic scanning structure an...

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Abstract

The new process for preparing TiB2 and TiC double-phase mixed hybridization reinforced magnesium alloy base composite material is characterized by that it adopts Al-Ti-B-C system reaction prefabricated block and makes it produce chemical synthesis reaction under the condition of vacuum or inert gas protection to prepare (TiB2+TiC) / Al intermediate phase carrier, then adds the intermediate phase carrier into molten magnesium alloy to make dissolution and diffusion, and fully stirs them to make said intermediate phase carrier be uniformly distributed in molten magnesium alloy to obtain the invented product in which the TiB2 is formed into block form and the TiC is formed into ball form, so that the comprehensive performance of said composite can be obviously raised.

Description

technical field [0001] The invention relates to a preparation method of a magnesium alloy-based composite material, in particular to a preparation method of a magnesium alloy-based composite material in a two-phase particle hybrid reinforcement mode. Background technique [0002] Magnesium alloy composites have attracted more and more attention in the fields of automobiles, aviation and aerospace due to their excellent comprehensive properties such as light weight, high specific strength, good wear resistance and high temperature performance. At present, the reinforcement methods of magnesium alloy matrix composites mainly include fiber reinforcement and particle reinforcement. Due to the complex fiber reinforcement process, high cost, poor wettability with the matrix, and poor machinability of continuous fiber reinforcement, the promotion and application of fiber reinforced magnesium alloy matrix composites are greatly limited, and it is difficult to achieve large-scale com...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C23/00
Inventor 姜启川王慧远李新林赵峰赵宇光赵玉谦王金国关庆丰
Owner JILIN UNIV
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