Method for preparing functionally gradient material through axially uniform magnetic field and directional solidification device thereof

A functionally graded material, directional solidification technology, applied in the field of directional melting and casting equipment, metal material technology and solidification equipment, can solve the problems of poor performance, high cost, small size of functionally graded materials, etc.

Inactive Publication Date: 2018-10-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for preparing functionally graded materials mainly include powder metallurgy, plasma spraying, gas phase product and laser cla...

Method used

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  • Method for preparing functionally gradient material through axially uniform magnetic field and directional solidification device thereof
  • Method for preparing functionally gradient material through axially uniform magnetic field and directional solidification device thereof
  • Method for preparing functionally gradient material through axially uniform magnetic field and directional solidification device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this example, refer to figure 1 , a directional solidification device, which utilizes an axial uniform magnetic field to prepare functionally graded materials. The directional solidification device consists of a protective atmosphere input pipe, a water-cooled furnace shell 1, a heating furnace 2, a temperature detection device, a quenching pool 8, a thermal insulation medium 5, and a thermal insulation Layer 6, corundum crucible 3 and pull rod 9, the inner furnace wall of the heating furnace 2 is made of non-magnetic stainless steel, the maximum temperature of the inner cavity of the heating furnace 2 is 1600 ° C; the temperature detection device adopts double platinum rhodium type Thermocouples measure the temperature in the furnace cavity of the heating furnace 2 in real time; the quenching pool 8 is arranged below the heating furnace 2, and the bottom of the heating furnace 2 is separated from the quenching pool 8 by the heat insulation layer 6 , the water-coole...

Embodiment 2

[0059] This embodiment is basically the same as Embodiment 1, especially in that:

[0060] In this embodiment, a method for preparing a functionally graded material using an axial uniform magnetic field uses the same directional solidification device as in Embodiment 1. When preparing an Al-Cu alloy functionally graded material, the following steps are included:

[0061] a. Raw material preparation:

[0062] Select high-purity metal raw materials with a purity of 99.99%, prepare Al-40wt.% Cu alloys, and repeatedly smelt them in a vacuum suspension furnace to fully homogenize the Al-Cu alloy raw materials. The tube is subjected to negative pressure suction casting to obtain an Al-Cu alloy rod with uniform composition, and the obtained Al-Cu alloy rod is packaged in a corundum crucible for standby;

[0063] b. Directional solidification equipment installation:

[0064] Put the directional solidification device in the axial uniform magnetic field, the magnetic field strength ne...

Embodiment 3

[0081] This embodiment is basically the same as the previous embodiment, and the special features are:

[0082] In this embodiment, by controlling the strength of the magnetic field, the magnitude of the gradient distribution of the directionally solidified primary phase structure along the longitudinal direction of the prepared material is adjusted.

[0083] It can be seen from Examples 1 and 2 that the directional solidification samples obtained in Examples 1 and 2 were cut symmetrically along the longitudinal direction to obtain a longitudinal section sample for observing the tissue. After the sample was mounted, it was ground and polished for corrosion observation Microstructure. image 3 and Figure 4 The comparisons of the directional solidified structures of Example 1 and Example 2 respectively reflect the contrast of solidified structure morphology before and after applying an axial uniform magnetic field. In Figure b-0.5T, Figure c-1T and Figure d-3T, it can be seen...

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Abstract

The invention discloses a method for preparing a functionally gradient material through an axially uniform magnetic field and a directional solidification device thereof. The magnetic field intensityrange of an axial magnetic field generated through a superconducting gradient strong magnet is not larger than 5 T, thermo-electromagnetic force induced by the magnetic field acts on alloy melt, thermo-electromagnetic flow is generated, as the content of precipitated phases in the alloy melt is increased along with decrease of the temperature and the temperature gradient exists in the directionalsolidification process, after the melt passes low-temperature positions, precipitation of the precipitated phases and rapid growth of the precipitated phases are promoted, the volume fraction of the precipitated phases exceeds the volume fraction of precipitated phases generated when the alloy is in equilibrium solidification, along with directional solidification, the content of solutes in the remaining melt is reduced, even the melt is turned into solute-depleted melt, finally the melt is solidified with the ingredients of eutectic, the functionally gradient material with the eutectic arranged on the upper portion and primary phases and eutectic phases on the lower portion is formed, and a novel technology direction is provided for preparing special materials through the axially uniformmagnetic field.

Description

technical field [0001] The invention relates to a method for preparing a gradient material and a directional casting device, in particular to a process and a solidification device for a metal material with a gradient structure, which is applied in the technical field of metal solidification structure control. Background technique [0002] Functionally graded materials are heterogeneous functional composites with continuous or quasi-continuous changes in structure and properties. Since the composition and organizational structure of materials change continuously in geometric space, the performance also changes continuously in geometric space. The new material could meet extreme needs, such as components needed in aerospace and nuclear power generation. [0003] At present, the methods for preparing functionally graded materials mainly include powder metallurgy, plasma spraying, gas phase product and laser cladding, etc., but these processes have various disadvantages, such a...

Claims

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Application Information

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IPC IPC(8): B22D27/04B22D27/02C30B29/52C30B30/04C30B28/06
CPCB22D27/02B22D27/045C30B28/06C30B29/52C30B30/04
Inventor 李喜胡少东侯龙韩翠邓康
Owner SHANGHAI UNIV
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