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Normal-pressure removing method of ceramic core in aero-engine titanium alloy casting

A technology for aero-engines and ceramic cores, applied in the direction of molds, cores, and mold components, can solve problems such as difficulty in controlling process parameters of core removal fluid update speed equipment, and achieve reduced removal costs, low prices, and prevention of Sedimentation and Coagulation Effects

Active Publication Date: 2020-07-10
DONGGUAN FUXING DETERGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some experience has been accumulated in the application and research of the formula of the core removal liquid, the core removal process and equipment, etc., but there are still problems such as the penetration of the core removal liquid and the update speed of the reaction interface, the need for a high-pressure environment, and the difficulty in controlling the process parameters of the equipment. Therefore, It is also necessary to explore other simpler, safer and more efficient methods of removing ceramic cores

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1, configuration of the core removal solution, which contains the following chemical components in mass fraction: 10% NaOH, 5% penetrating agent, 5% dispersant and 5% auxiliary agent. Among them, the alkali-resistant penetrating agent OEP-70 is used as the penetrating agent, sodium stearate is used as the dispersant, KF is used as the auxiliary agent, and water is used as the rest.

[0025] Step 2, ultrasonic, heating-assisted atmospheric pressure core removal. Put the prepared core removal solution and the titanium alloy casting to be treated into an ultrasonic machine, heat at 90°C, and use 40,000Hz ultrasonic waves at a power of 500W to ultrasonicate until the ceramic core is pulverized and removed for 24 hours.

[0026] Step 3, acid solution neutralization and cleaning. Put step 2 in the 0.01M dilute hydrochloric acid solution with compressed air, and stir the compressed air and 0.01M dilute hydrochloric acid solution, place the titanium alloy casting in the a...

Embodiment 2

[0029] Step 1, configuration of the core removal solution, including the following chemical components in mass fractions: 30% NaOH, 4% penetrant, 4% dispersant and 4% auxiliary. Among them, the penetrating agent uses 2% OEP-70 and 2% AEP, the dispersant uses 2% disodium EDTA and 2% sodium stearate, and the auxiliary agent uses 2% KF and 2% NH 4 F, the rest is water.

[0030] Step 2, ultrasonic, heating-assisted atmospheric pressure core removal. Put the prepared core removal solution and the titanium alloy casting to be treated into an ultrasonic machine, heat at 80°C, and use 40000Hz ultrasonic wave at a power of 400W until the ceramic core is pulverized and removed for 20 hours.

[0031] Step 3, acid solution neutralization and cleaning. Put step 2 in the 0.01M dilute hydrochloric acid solution with compressed air, and stir the compressed air and 0.01M dilute hydrochloric acid solution, place the titanium alloy casting in the above-mentioned stirred compressed air and 0.01...

Embodiment 3

[0034] Step 1, configuration of the core removal solution, which contains the following chemical components in mass fractions: 20% NaOH and 20% KOH, 5% penetrating agent, 5% dispersant and 5% auxiliary agent. Among them, the penetrating agent uses OEP-70, the dispersant uses sodium stearate, the auxiliary agent uses KF, and the rest is water.

[0035] Step 2, ultrasonic, heating-assisted atmospheric pressure core removal. Put the prepared core removal solution and the titanium alloy casting to be treated into an ultrasonic machine, heat at 90°C, and use 40,000Hz ultrasonic waves at a power of 300W to ultrasonicate until the ceramic core is pulverized and removed for 18 hours.

[0036] Step 3, acid solution neutralization and cleaning. Put the step 2 in the 0.01M dilute hydrochloric acid solution with compressed air, and stir the compressed air and 0.01M dilute hydrochloric acid solution, place the titanium alloy casting in the above-mentioned stirred compressed air and 0.01M ...

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Abstract

The invention relates to a normal-pressure removing method of a ceramic core in an aero-engine titanium alloy casting. The method comprises the steps that: (1) preparation of core removing liquid: thecore removing liquid contains the following chemical components in percentage by mass: 10-40% of NaOH or KOH or a mixed solution thereof, 3-5% of a penetrating agent, 3-5% of a dispersing agent, 3-5%of an auxiliary, and the balance of water; (2) ultrasonic and heating assisted normal-pressure core removal: a titanium alloy casting to be treated is put in the core removing liquid in step (1), thetemperature of the core removing liquid is 70-90 DEG C, and ultrasonic waves are intermittently applied; and (3) acid liquid neutralization and cleaning: the titanium alloy casting in step (2) is putin a 0.01 M dilute hydrochloric acid or citric acid solution accompanied with compressed air stirring for 20-40 minutes, and then, the titanium alloy casting is taken out and put in clear water to clean by 10-30 minutes. The normal-pressure removing method has the advantages of low cost of needed raw materials, simple process flow, implementation of the removing process under a normal pressure and low energy loss.

Description

technical field [0001] The invention relates to the technical field of removing hollow blades of aero-engines, in particular to an atmospheric-pressure removing method for ceramic cores in titanium alloy castings of aero-engines. Background technique [0002] With the development of aviation gas turbine technology, new turbine engines require higher gas inlet temperature to increase the efficiency and service life of gas turbines, which requires superalloy turbine blades to have stronger temperature bearing capacity. Relying solely on material modification can no longer meet the above requirements. Therefore, the hollow blades of titanium alloy turbines with air-cooled inner channels are produced by presetting ceramic cores in the molding process to improve the cooling conditions of the blades and increase the temperature bearing capacity of the blades. With the continuous improvement of the cooling method of superalloy turbine blades, the shape of the inner cavity is requir...

Claims

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Application Information

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IPC IPC(8): B22D29/00B22C9/10
CPCB22C9/106B22D29/002B22D29/003
Inventor 刘发生
Owner DONGGUAN FUXING DETERGENT TECH
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