High-temperature and high-pressure core removal device and method for alumina-based ceramic core removal

Abstract

The invention discloses a high-temperature high-pressure core-removing device and core-removing method for an alumina-based ceramic core, pertaining to the technical field of high-temperature alloy castings. A main body part of the core-removing device is composed of a pressure-tolerant kettle body and a reaction charging basket. A nitrogen compressor and a nitrogen storage tank are used for supercharging, releasing pressure and gas recovery of the core-removing device. Heating coils are used for increasing temperature of the core-removing device. A pressure regulator is used for providing alternative high pressure required by the core-removing device. A gas flow regulator is used for controlling gas flow and pressure of all pipelines. A KOH water solution with 55-80% of concentration is used as core-removing liquid at the temperature ranging from 350 to 410 DEG C. During the process of removing a mold core, alternating pressure with 15-25 MPa is applied or constant pressure with 22-25 MPa is applied. The high-temperature high-pressure core-removing device and core-removing method for the alumina-based ceramic core have following beneficial effects: the alumina-based ceramic core of a gas turbine blade can be smoothly removed; and alumina-based ceramic cores of other high-temperature alloy castings can be removed.

Description

technical field

[0001] The invention relates to the technical field of high-temperature alloy castings, in particular to a high-temperature and high-pressure core removal device and method for alumina-based ceramic cores. Ceramic cores are also suitable for extracting alumina-based ceramic cores in other superalloy castings with complex cavities. Background technique

[0002] In recent years, the rapid development of my country's aviation, shipbuilding, power generation and other industries has put forward higher and higher requirements for the thermal efficiency of advanced gas turbines. Increasing the inlet temperature of the turbine is one of the important ways to improve the thermal efficiency of gas turbines. This also requires blades The temperature resistance ability is continuously improved. There are three main ways to improve the temperature resistance of blades: material alloying and solidification technology, high temperature protective coating technology, and ad...

Examples

Embodiment 1

[0080] In this embodiment, the above-mentioned core removal device is used to remove the core through high temperature and alternating high pressure. The process is as follows:

[0081] Put the casting into the reaction tank 13, and add 150 kg of KOH solution with a mass concentration of 55%, and the reaction tank is installed in the pressure-resistant kettle body 12.

[0082] Open the valve A2, the nitrogen gas from the nitrogen storage tank 7 directly enters the reaction tank 13 and the pressure-resistant kettle body 12 through the gas flow regulator I10 and the gas flow regulator II19, and then reaches the nitrogen storage tank 7, the reaction tank 13 and the pressure-resistant kettle After the pressure in the body 12 is equalized, the valve A2 is closed.

[0083] Open the valve C5 and valve B3 in turn, and turn on the nitrogen compressor 4. The nitrogen flowing out of the nitrogen storage tank 7, after being pressurized by the nitrogen compressor 4, enters the reaction bar...

Embodiment 2

[0092] In this embodiment, the above-mentioned core removal device is used to remove the core through high temperature and alternating high pressure. The process is as follows:

[0093] Put the casting into the reaction tank 13, and add 175 kg of KOH solution with a mass concentration of 70%, and the reaction tank is installed in the pressure-resistant kettle body 12.

[0094] Open the valve A2, the nitrogen gas from the nitrogen storage tank 7 directly enters the reaction tank 13 and the pressure-resistant kettle body 12 through the gas flow regulator I10 and the gas flow regulator II19, and then reaches the nitrogen storage tank 7, the reaction tank 13 and the pressure-resistant kettle After the pressure in the body 12 is equalized, the valve A2 is closed.

[0095] Open the valve C5 and valve B3 in turn, and turn on the nitrogen compressor 4. The nitrogen flowing out of the nitrogen storage tank 7, after being pressurized by the nitrogen compressor 4, enters the reaction mat...

Embodiment 3

[0104] In this embodiment, the above-mentioned core removal device is used to remove the core through high temperature and constant high pressure. The process is as follows:

[0105] The casting is put into the reaction tank 13, and 180 kg of KOH solution with a mass concentration of 80% is added, and the reaction tank 13 is installed in the pressure-resistant kettle body 12.

[0106] Open the valve A2, the nitrogen gas from the nitrogen storage tank 7 directly enters the reaction tank 13 and the pressure-resistant kettle body 12 through the gas flow regulator I10 and the gas flow regulator II19, and then reaches the nitrogen storage tank 7, the reaction tank 13 and the pressure-resistant kettle After the pressure in the body 12 is equalized, the valve A2 is closed.

[0107] Open the valve C5 and valve B3 in turn, and turn on the nitrogen compressor 4. The nitrogen flowing out of the nitrogen storage tank 7, after being pressurized by the nitrogen compressor 4, enters the reac...

technical field

[0001] The invention relates to the technical field of high-temperature alloy castings, in particular to a high-temperature and high-pressure core removal device and method for alumina-based ceramic cores. Ceramic cores are also suitable for extracting alumina-based ceramic cores in other superalloy castings with complex cavities. Background technique

[0002] In recent years, the rapid development of my country's aviation, shipbuilding, power generation and other industries has put forward higher and higher requirements for the thermal efficiency of advanced gas turbines. Increasing the inlet temperature of the turbine is one of the important ways to improve the thermal efficiency of gas turbines. This also requires blades The temperature resistance ability is continuously improved. There are three main ways to improve the temperature resistance of blades: material alloying and solidification technology, high temperature protective coating technology, and ad...

Examples

Embodiment 1

[0080] In this embodiment, the above-mentioned core removal device is used to remove the core through high temperature and alternating high pressure. The process is as follows:

[0081] Put the casting into the reaction tank 13, and add 150 kg of KOH solution with a mass concentration of 55%, and the reaction tank is installed in the pressure-resistant kettle body 12.

[0082] Open the valve A2, the nitrogen gas from the nitrogen storage tank 7 directly enters the reaction tank 13 and the pressure-resistant kettle body 12 through the gas flow regulator I10 and the gas flow regulator II19, and then reaches the nitrogen storage tank 7, the reaction tank 13 and the pressure-resistant kettle After the pressure in the body 12 is equalized, the valve A2 is closed.

[0083] Open the valve C5 and valve B3 in turn, and turn on the nitrogen compressor 4. The nitrogen flowing out of the nitrogen storage tank 7, after being pressurized by the nitrogen compressor 4, enters the reaction bar...

Embodiment 2

[0092] In this embodiment, the above-mentioned core removal device is used to remove the core through high temperature and alternating high pressure. The process is as follows:

[0093] Put the casting into the reaction tank 13, and add 175 kg of KOH solution with a mass concentration of 70%, and the reaction tank is installed in the pressure-resistant kettle body 12.

[0094] Open the valve A2, the nitrogen gas from the nitrogen storage tank 7 directly enters the reaction tank 13 and the pressure-resistant kettle body 12 through the gas flow regulator I10 and the gas flow regulator II19, and then reaches the nitrogen storage tank 7, the reaction tank 13 and the pressure-resistant kettle After the pressure in the body 12 is equalized, the valve A2 is closed.

[0095] Open the valve C5 and valve B3 in turn, and turn on the nitrogen compressor 4. The nitrogen flowing out of the nitrogen storage tank 7, after being pressurized by the nitrogen compressor 4, enters the reaction mat...

Embodiment 3

[0104] In this embodiment, the above-mentioned core removal device is used to remove the core through high temperature and constant high pressure. The process is as follows:

[0105] The casting is put into the reaction tank 13, and 180 kg of KOH solution with a mass concentration of 80% is added, and the reaction tank 13 is installed in the pressure-resistant kettle body 12.

[0106] Open the valve A2, the nitrogen gas from the nitrogen storage tank 7 directly enters the reaction tank 13 and the pressure-resistant kettle body 12 through the gas flow regulator I10 and the gas flow regulator II19, and then reaches the nitrogen storage tank 7, the reaction tank 13 and the pressure-resistant kettle After the pressure in the body 12 is equalized, the valve A2 is closed.

[0107] Open the valve C5 and valve B3 in turn, and turn on the nitrogen compressor 4. The nitrogen flowing out of the nitrogen storage tank 7, after being pressurized by the nitrogen compressor 4, enters the reac...

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