Alumina-based ceramic core removal method and special device thereof

A special equipment and alumina technology, which is applied in the field of high-temperature alloy hollow blade removal, can solve the problems of low removal efficiency and achieve the effects of increased removal speed, improved reaction efficiency, and good stirring effect

Active Publication Date: 2014-04-30
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for removing alumina-based ceramic cores, which solves the problem of low removal efficiency in existing removal methods

Method used

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  • Alumina-based ceramic core removal method and special device thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1, filling the reactor with KOH with a concentration of 45%, then placing the hollow blade with the alumina-based ceramic core in the parts basket, and then sealing the reactor;

[0040] Step 2, through the high temperature and high pressure closed environment, the temperature is controlled at 300 ° C, the pressure is controlled at 3.5 MPa, and the reactor is heated, so that KOH can penetrate into all the gaps of the hollow blade with alumina-based ceramic core, and corrosion occurs React for 10 minutes;

[0041] Step 3, reduce the pressure in the reactor to 2.0MPa, make the lye boil and roll into the channel of the hollow blade, and the process lasts for 15s;

[0042] Step 4, restore the pressure in the reactor, stop the lye from boiling, and return to a stable state;

[0043]Repeat steps 2 to 4 6 times until the alumina-based ceramic core is completely removed;

[0044] Step 5, remove the residual lye and the removed ceramic residual core from the hollow chip, ...

Embodiment 2

[0046] Step 1, filling the reactor with NaOH with a concentration of 40%, then placing the hollow blade with the alumina-based ceramic core in the parts basket, and then sealing the reactor;

[0047] Step 2, through the high temperature and high pressure closed environment, the temperature is controlled at 200 ° C, the pressure is controlled at 1.5 MPa, and the reactor is heated to make NaOH penetrate into all the gaps of the hollow blade with the alumina-based ceramic core, and corrosion occurs React for 15 minutes;

[0048] Step 3, the pressure in the reactor is reduced to 0.5MPa, so that the lye boils and rolls into the channel of the hollow blade, and the process lasts for 20s;

[0049] Step 4, restore the pressure in the reactor, stop the lye from boiling, and return to a stable state;

[0050] Repeat steps 2 to 4 12 times until the alumina-based ceramic core is completely removed;

[0051] Step 5, remove the residual lye and the removed ceramic residual core from the h...

Embodiment 3

[0053] Step 1, filling the reactor with KOH with a concentration of 60%, then placing the hollow blade with the alumina-based ceramic core in the parts basket, and then sealing the reactor;

[0054] Step 2, through the high temperature and high pressure airtight environment, the temperature is controlled at 150°C, the pressure is controlled at 0.5MPa, and the reactor is heated to make KOH penetrate into all the gaps of the hollow blade with alumina-based ceramic core, and corrosion occurs React for 30 minutes;

[0055] Step 3, the pressure in the reactor is reduced to 1.5MPa, so that the lye boils and rolls into the channel of the hollow blade, and the process lasts for 30s;

[0056] Step 4, restore the pressure in the reactor, stop the lye from boiling, and return to a stable state;

[0057] Repeat steps 2 to 4 10 times until the alumina-based ceramic core is completely removed;

[0058] Step 5, removing the residual lye and the removed ceramic residual core from the hollow...

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Abstract

Disclosed are an alumina-based ceramic core removal method and a special device thereof. The method includes placing a hollow blade with an alumina-based ceramic core into a reaction kettle fully filled with lye, and then sealing the reaction kettle; heating the reaction kettle in high-temperature, high-pressure and airtight environment; decreasing the pressure of the reaction kettle till being lower than the saturated vapor pressure of the lye, allowing the lye to be boiled to enter channels of the hollow blade for 10 to 30 seconds; recovering the pressure in the reaction kettle to stop boiling the lye and recover stable statues; removing residual lye and removed ceramic core from the hollow blade, and finally utilizing acid to neutralize residual lye on the hollow blade, and washing with water. The method has the advantages that reacted waste lye in the cavity of the hollow blade can be discharged rapidly through high temperature and increasing and decreasing the pressure repeatedly, good stirring effect is provided by periodically boiling the lye, the lye is guaranteed contacting with the alumina-based ceramic core fully, reacting efficiency is improved, and removal speed of the alumina-based ceramic core is increased significantly.

Description

technical field [0001] The invention belongs to the technical field of removing high-temperature alloy hollow blades, and relates to a method for removing alumina-based ceramic cores, and also relates to special equipment for removing alumina-based ceramic cores. Background technique [0002] With the continuous improvement of the performance of aero-engines, the temperature of the front inlet of the turbine of the engine is close to or even exceeds the melting point of the material of the turbine blades, and the blades must be cooled by air cooling. In the casting production process of superalloy air-cooled hollow blades, ceramic cores are generally used to form their complex inner cavity structures. [0003] The alumina-based core has more excellent thermal strength and thermal stability, and is especially suitable for the casting of superalloy blades under directional solidification and single crystal conditions. Since the main component of the alumina-based core is coru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D29/00
Inventor 韩志宇曾光梁书锦陈小林张鹏张平祥
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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