Monocrystal high temperature alloy electric field directional freeze apparatus

A high-temperature alloy and directional solidification technology, which is applied in single crystal growth, self-solidification, crystal growth, etc., can solve the problems of unfavorable DC electric field, increase of radial temperature gradient of directional solidification solid-liquid interface, super heat loss, etc., to achieve Good protective effect, refine metal solidification structure, reduce segregation effect

Inactive Publication Date: 2004-06-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

In ordinary argon-protected directional solidification equipment, due to the argon flow through the gap between the test tube and the heat insulation baffle, the excess heat is lost, causing the radial temperature gradient of the directional solidification solid-liquid interface to increase, which is not conducive to the DC electric field. After the DC electric field, how to quench the sample is also a problem that needs to be solved

Method used

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  • Monocrystal high temperature alloy electric field directional freeze apparatus
  • Monocrystal high temperature alloy electric field directional freeze apparatus
  • Monocrystal high temperature alloy electric field directional freeze apparatus

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Embodiment Construction

[0019] like figure 1 As shown, the structure of the single crystal superalloy electric field directional solidification equipment includes three parts: a heating device 4, a clamping mechanism 7 and a DC electric field generating device. This is described in detail below.

[0020] The heating device 4 uses an IGBT super-audio power supply to generate single-phase alternating current, which is sent to the induction heater 41 after being stepped down by the transformer. The induction heater 41 heats the graphite induction body 42, and the graphite induction body 42 heats the sample 3 by radiation. principle such as figure 2 shown.

[0021] High-purity Al is used around the graphite induction body 42 2 o 3 Insulation cotton 11 insulation, Al 2 o 3 Insulation cotton 11 has a refractoriness higher than 1700°C and has a good heat preservation effect. After the heating furnace works at 1550°C for two hours, the temperature of the quartz glass cover (shell) 2 is still lower tha...

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Abstract

The invention relates to the single crystal high-temperature alloy solidifying technique, including case, heating set, sample clamping framework and DC electric field generating set. The clamping framework is set under the case, composed of two clamping bars set on the bracket, one end of each clamping bar linked with the rotation shaft on the bracket, the other end linked through fastener, and the outer side of each clamping bar installed with tension spring, the other end of each tension spring fixed on the bracket, and the bracket opened with a through hole to make the sample pass through; the generating set is a close loop, formed by setting a programmable functional module in series between one end of the sample and one pole of the voltage-stailized source, and connecting the other end with the other pole through the clamping tool.

Description

technical field [0001] The invention relates to a single crystal superalloy solidification technology, in particular to an electric field directional solidification device for a single crystal superalloy. Background technique [0002] Single crystal superalloys have superior high-temperature creep properties and low-cycle thermal fatigue properties, and are the preferred superalloy materials for aeroengine blades. However, the solidification rate of single crystal superalloys is low, and the solidification structure is coarse; at the same time, due to the high degree of alloying, solute segregation is very easy to occur, which has an adverse effect on the structure and properties of the alloy, which limits the potential of single crystal superalloys. Minimizing the solidification structure of single crystal superalloys and reducing solidification segregation are the goals pursued by the field of materials research. The existing research results show that the electric field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/02C30B11/00
Inventor 杨院生程根发冯晓辉童文辉张宇男李处森
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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