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Process for preparing intermetallic compound

A technology of intermetallic compounds and metals, which is applied in the field of preparation of intermetallic compounds, can solve the problems of difficult preparation of intermetallic compounds of chemical composition, easy generation of voids in materials, high sintering temperature, etc. Organization and composition, effect of large contact area

Inactive Publication Date: 2002-08-14
PEKING UNIV
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Problems solved by technology

Among them, the casting method is to obtain intermetallic compounds by adjusting the composition of liquid metal in a special smelting furnace, but this method is prone to produce coarse grains, and requires multiple smelting to reduce component segregation, and generally requires special heat during molding. processing, high cost
For intermetallic compounds with large differences in melting point and specific gravity and volatile metals, it is difficult to prepare intermetallic compounds with precise chemical composition by casting method
The powder metallurgy method is based on the chemical composition of intermetallic compounds. Usually, the metal powder with a particle size of several hundred meshes is mixed to form a billet of a certain shape, and then sintered at high temperature. The main problem of this method is that the material is prone to voids after sintering, which is difficult to precision Forming, and sintering into pure intermetallic compounds requires a higher sintering temperature, which often results in coarse grains

Method used

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  • Process for preparing intermetallic compound
  • Process for preparing intermetallic compound
  • Process for preparing intermetallic compound

Examples

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Embodiment

[0018] Synthesis of Disc-shaped Mg Using Nanoscale Nickel Powder and Submicron Magnesium Powder 2 Ni intermetallic compound, the steps are as follows:

[0019] (1) First put nickel powder with an average particle size of 22nm and magnesium powder with an average particle size of 800nm ​​in the mixer according to a molar ratio of 1:2, add a certain amount of dispersion solution, the volume ratio of the dispersion solution and metal ultrafine powder is 2 : 1, mixed for 2 hours;

[0020] (2) Remove the dispersion solution, put the mixed powder into a cylindrical mold with an inner diameter of 13mm, and press it into a disc-shaped blank of Φ13mm×2mm under a pressure of 100MPa;

[0021] (3) Put the billet into a heat treatment furnace, raise the temperature to 773K (that is, about the melting point of metal magnesium 0.8Tm) under the condition of argon, and keep it at this temperature for 2 hours, and an alloying reaction can occur to form a disc-shaped Mg 2 Ni intermetallic comp...

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Abstract

A process for preparing intermetallic compound includes such steps as preparing sub-micron or nano powder of metals, mixing, die pressing, heating to a temp 0.3 Tm higher than low-smelting-point metal in vacuum or protection atmosphere, keeping the temp for 0.5-10 hr for alloying reaction, and cooling. Its advantages include alloying and sintering as same time, low temp and small crystal grain.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of intermetallic compounds. Background technique: [0002] Intermetallic compounds have outstanding advantages such as light specific gravity, high temperature resistance, and oxidation resistance. They are a kind of high-temperature structural materials with great potential, and have broad application prospects in aerospace, transportation, chemical and mechanical industries. At present, the preparation methods of intermetallic compounds mainly include casting method and powder metallurgy method. Among them, the casting method is to obtain intermetallic compounds by adjusting the composition of liquid metal in a special smelting furnace, but this method is easy to produce coarse grains, which requires multiple smelting to reduce component segregation, and generally requires special heat during molding. Processing is expensive. For intermetallic compounds with large differences in melting p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04
Inventor 李星国刘彤
Owner PEKING UNIV