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Combined type heat-insulating baffle for increasing monocrystal solidification temperature gradient

A technology of heat insulation baffle and solidification temperature, applied in the direction of single crystal growth, self-solidification method, crystal growth, etc., can solve the problems of time-consuming molybdenum sheet processing, interruption of production process, influence of heat insulation effect, etc. Simple processing and low cost of use

Active Publication Date: 2014-09-24
GUIYANG AVIC POWER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the corundum ring is resistant to high temperature, but it is easy to crack in high temperature use, which affects the heat insulation effect
Molybdenum sheet processing is time-consuming and expensive
Hard graphite felt has a good heat insulation effect, but it is easily damaged, has a short service life, and is easily damaged when shell leakage occurs, resulting in interruption of the production process

Method used

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  • Combined type heat-insulating baffle for increasing monocrystal solidification temperature gradient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the ZGD-1 vacuum induction directional solidification furnace, a composite heat insulation baffle is used. The inner and outer diameters of the annular body of the composite heat insulation baffle are Φ200mm and Φ250mm, the total height of the annular body is 150mm, and the outer diameter of the upper graphite ring is is 100mm, and the inner diameter of the upper graphite ring is 50mm. After testing, the temperature gradient increased from the usual 40-60°C / cm to 60-80°C / cm.

Embodiment 2

[0018] In the DSP II vacuum induction directional solidification furnace, a composite heat insulation baffle is used. The inner and outer diameters of the annular body of the composite heat insulation baffle are Φ220mm and Φ270mm, the total height of the annular body is 150mm, and the outer diameter of the upper graphite ring is is 100mm, and the inner diameter of the upper graphite ring is 50mm. After testing, the temperature gradient changed from the usual 30-60°C / cm to 50-70°C / cm.

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PUM

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Abstract

The invention relates to a combined type heat-insulating baffle which is applied to directional solidification equipment and is used for increasing monocrystal solidification temperature gradient. The combined type heat-insulating baffle comprises graphite rings and a flexible graphite felt, wherein the graphite rings and the flexible graphite felt are combined into an annular body, the inner diameter of which is more than the outer diameter of a shell mould to be cast; and the graphite rings are divided into two layers, the upper-layer graphite ring is directly placed on a water cooling sleeve in a directional solidification furnace, the flexible graphite felt is filled between the two layers of graphite ring, a height difference exists between the height of the inner diameter of the upper-layer graphite ring and the height of the outer diameter of the upper-layer graphite ring, and the height from the inner diameter to the outer diameter is increased in a smooth transition manner. The combined type graphite high-temperature heat-insulating baffle disclosed by the invention is convenient to manufacture by just clipping the flexible graphite felt according to dimensions and placing the clipped flexible graphite felt on the graphite rings on the water cooling sleeve as well as directly placing the second-layer graphite ring on the graphite felt, no bolts and nuts are needed for fixation, the placement is convenient and the price cost is low. Compared with the prior art in which a hard graphite felt is used as the heat-insulating baffle, the combined type heat-insulating baffle has the advantage that the temperature gradient is increased by almost 50%.

Description

technical field [0001] The invention relates to a composite heat-insulating baffle for increasing the solidification temperature gradient of a single crystal, which is applied to directional solidification equipment. Background technique [0002] Single crystal superalloys are one of the most important key materials for aero-engines. Since the 1980s, the single crystal superalloy technology for turbine blades has been a very important key technology for the development of aero-engines and weaponry. At present, single crystal test rods and blades are mainly obtained by the rapid solidification method (HRS). The process parameters of directional solidification technology include the temperature gradient G of the liquid phase at the front of the solid-liquid interface during the solidification process. L And the solid-liquid interface moves forward with speed R. G L The / R value is an important criterion for controlling the stability of the single crystal growth interface. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B11/00
Inventor 刘维维唐定中
Owner GUIYANG AVIC POWER PRECISION CASTING
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