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
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[0023] Example 1:
[0024] Step 1, the configuration of the core removal liquid, which contains the following chemical components in mass fraction: 10% NaOH, 5% penetrant, 5% dispersant and 5% auxiliary agent. Among them, the penetrant uses alkali-resistant penetrant OEP-70, the dispersant uses sodium stearate, the auxiliary agent uses KF, and the rest is water.
[0025] Step 2: Normal pressure de-coring assisted by ultrasound and heating. Put the configured core removal liquid and the titanium alloy casting to be processed into an ultrasonic machine, and heat it at 90°C, while using 40,000 Hz ultrasonic waves to sonicate the ceramic core at a power of 500 W until the ceramic core is powdered and removed for 24 hours.
[0026] Step 3. Acid neutralization and cleaning. Put step two in the 0.01M diluted hydrochloric acid solution with compressed air, and stir the compressed air and 0.01M diluted hydrochloric acid solution, and place the titanium alloy casting in the above-mentioned s...
Example Embodiment
[0028] Example 2:
[0029] Step 1, the configuration of the core removal liquid, which contains the following chemical components in mass fractions: 30% NaOH, 4% penetrant, 4% dispersant and 4% auxiliary agent. Among them, the penetrant uses 2% OEP-70 and 2% AEP, the dispersant uses 2% disodium EDTA and 2% sodium stearate, and the auxiliary uses 2% KF and 2% NH 4 F, the rest is water.
[0030] Step 2: Normal pressure de-coring assisted by ultrasound and heating. Put the configured core removal liquid and the titanium alloy casting to be processed into an ultrasonic machine, and heat it at 80°C, while using an ultrasonic wave of 40,000 Hz at a power of 400 W to sonicate the ceramic core for 20 hours.
[0031] Step 3. Acid neutralization and cleaning. Put step two in the 0.01M diluted hydrochloric acid solution with compressed air, and stir the compressed air and 0.01M diluted hydrochloric acid solution, and place the titanium alloy casting in the above-mentioned stirred compressed a...
Example Embodiment
[0033] Example 3:
[0034] Step 1, the configuration of the core removal liquid, including the following mass fractions of chemical components: 20% NaOH and 20% KOH, 5% penetrant, 5% dispersant and 5% auxiliary agent. Among them, OEP-70 is used as penetrant, sodium stearate is used as dispersant, KF is used as auxiliary agent, and the rest is water.
[0035] Step 2: Normal pressure de-coring assisted by ultrasound and heating. Put the configured core removal liquid and the titanium alloy castings to be processed into an ultrasonic machine, and heat at 90°C, while using 40,000 Hz ultrasonic waves to sonicate at 300 W power until the ceramic core powder is removed for 18 hours.
[0036] Step 3. Acid neutralization and cleaning. Put step two in the 0.01M diluted hydrochloric acid solution with compressed air, and stir the compressed air and 0.01M diluted hydrochloric acid solution, and place the titanium alloy castings in the above-mentioned stirred compressed air and 0.01M diluted hy...
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