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Process for preparing composite materials with self radial gradient by in situ crystallization

A composite material and radial gradient technology, applied in the field of composite material preparation, can solve the problems of unstable gradient effect of self-generated composite materials, difficult to control the heating effect of induced high-frequency magnetic field, slow heat dissipation of casting materials, etc.

Inactive Publication Date: 2004-02-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method reasonably controls the application timing of the induced high-frequency magnetic field, and at the same time the casting material used has a slow heat dissipation and is multi-channel in parallel, it is difficult to control the heating effect of the induced high-frequency magnetic field on the composite material in the preparation process , causing part of the reinforcement to re-melt into the matrix, resulting in an extremely unstable gradient effect of the self-generated composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Using Al-15%Mg 2 The Si-5% Si hypereutectic alloy is used as the raw material for the preparation of self-generated gradient composite materials. After remelting at 800 ° C, it is poured into a single-channel SiC casting mold placed in a high-frequency magnetic field. The preheating temperature of the SiC casting mold is 30°C, and the power supply of the high-frequency magnetic field is 7.0Kw. When the composite material is poured, the high-frequency magnetic field is turned on, the applied temperature range is 555-570°C, and the action time is 4s. In the self-generated gradient composite obtained, Mg 2 The thickness of the segregation layer of the Si reinforcement is 2mm.

Embodiment 2

[0017] Using Al-15%Mg 2 The Si-5% Si hypereutectic alloy is used as the raw material for the preparation of the self-generated gradient composite material. After remelting at 800 ° C, it is poured and placed in a but-channel SiC casting mold placed in a high-frequency magnetic field. The preheating temperature of the SiC casting mold is 200°C, and the power supply of the high-frequency magnetic field is 4.0Kw. After the composite material was poured, the high-frequency magnetic field was turned on, the applied temperature range was 565-585°C, and the action time was 27s. In the self-generated gradient composite obtained, Mg 2 The thickness of the segregation layer of the Si reinforcement is 0.5mm.

Embodiment 3

[0019] The Al-18% Si hypereutectic alloy is used as the raw material for the preparation of the self-generated gradient composite material. After remelting at 750°C, it is poured into a single-channel SiC casting mold placed in a high-frequency magnetic field. The preheating temperature of the SiC casting mold is 285°C, and the power supply of the high-frequency magnetic field is 2.0Kw. After the composite material is poured, the high-frequency magnetic field is turned on, the applied temperature ranges from 580 to 640°C, and the action time is 32s. In the self-generated gradient composite obtained, Mg 2 The thickness of the segregation layer of the Si reinforcement is 1.3mm.

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Abstract

A technology for preparing the autogenous composition with radial gradient features that after molten autogenous composition is poured in the SiC mould which is arranged in an induced HF magnetic field and has a temp measuring unit, the active temp range of said HF magnetic field is controlled by said temp measuring unit to maintain the thermal balance in composition for obtaining high gradient effect.

Description

technical field [0001] The invention relates to a process for preparing composite materials, especially a process for preparing self-generated radial gradient composite materials by combining in-situ crystallization and induced high-frequency magnetic field separation technology, which belongs to the field of composite material preparation . Background technique [0002] In the in-situ composite method of particle-reinforced metal matrix composites, in-situ crystallization composites are formed by in-situ crystallization of reinforced particles, and there are no existing reinforced particles in the composite material melt at high temperature, so the prepared composite materials can be remelted and reused. Compared with composite materials obtained by other in situ preparation methods, the stability has more significant advantages. The principle of separating non-metallic phases using the significant conductivity difference between the metal melt and the non-metallic heterog...

Claims

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Application Information

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IPC IPC(8): B22D27/02
Inventor 王俊李赤枫疏达李克孙宝德
Owner SHANGHAI JIAO TONG UNIV
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