A kind of atmospheric pressure removal method of the ceramic core in the titanium alloy casting of aero-engine

A technology for aero-engines and ceramic cores, applied in the direction of cores, molds, mold components, etc., can solve the problems of difficulty in controlling the process parameters of the core removal fluid update speed equipment, and achieve lower removal costs, easy access, and removal The effect of high core efficiency

Active Publication Date: 2021-08-06
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 method for removing a ceramic core in an aero-engine titanium alloy casting under normal pressure, comprising the following steps: Step 1, configuration of a core removal liquid: the core removal liquid contains the following chemical components in mass fractions: 10 %~40% NaOH or KOH or their mixed solution, 3%~5% penetrating agent, 3%~5% dispersant, 3%~5% auxiliary agent, and the rest is water; step 2, ultrasonication, heating Auxiliary normal pressure core removal: Put the titanium alloy casting to be treated into the core removal liquid in step 1, the temperature of the core removal liquid is 70 ℃ ~ 90 ℃, and apply ultrasonic waves intermittently; step 3, acid solution neutralization and cleaning, Place the titanium alloy casting in step 2 in 0.01M dilute hydrochloric acid or citric acid solution stirred with compressed air, and after standing for 20-40 minutes, take out the titanium alloy casting and wash it in clean water for 10-30 minutes. The normal pressure removal method of the present invention has the following advantages: the required raw material price is low, the process flow is simple, the removal process is carried out under normal pressure and the energy loss is small.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B22D29/00B22C9/10
CPCB22C9/106B22D29/002B22D29/003
Inventor 刘发生
Owner DONGGUAN FUXING DETERGENT TECH
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