CN116441518A - Core removing method for rare earth oxide core-shell structure ceramic core - Google Patents
Core removing method for rare earth oxide core-shell structure ceramic core Download PDFInfo
- Publication number
- CN116441518A CN116441518A CN202310105858.3A CN202310105858A CN116441518A CN 116441518 A CN116441518 A CN 116441518A CN 202310105858 A CN202310105858 A CN 202310105858A CN 116441518 A CN116441518 A CN 116441518A
- Authority
- CN
- China
- Prior art keywords
- core
- titanium alloy
- alloy casting
- liquid
- rare earth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 45
- 229910001404 rare earth metal oxide Inorganic materials 0.000 title claims abstract description 20
- 239000011258 core-shell material Substances 0.000 title claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 94
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 90
- 239000007788 liquid Substances 0.000 claims abstract description 62
- 238000004140 cleaning Methods 0.000 claims abstract description 30
- 239000000126 substance Substances 0.000 claims abstract description 19
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 42
- 239000012752 auxiliary agent Substances 0.000 claims description 28
- 239000003795 chemical substances by application Substances 0.000 claims description 23
- 230000000149 penetrating effect Effects 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 22
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- 230000001737 promoting effect Effects 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 15
- 238000009792 diffusion process Methods 0.000 claims description 12
- 230000010355 oscillation Effects 0.000 claims description 12
- 239000000376 reactant Substances 0.000 claims description 12
- 230000036632 reaction speed Effects 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 claims description 8
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- 238000004090 dissolution Methods 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims description 7
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 2
- LXAHHHIGZXPRKQ-UHFFFAOYSA-N 5-fluoro-2-methylpyridine Chemical compound CC1=CC=C(F)C=N1 LXAHHHIGZXPRKQ-UHFFFAOYSA-N 0.000 claims 2
- 230000008569 process Effects 0.000 abstract description 15
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000001988 toxicity Effects 0.000 abstract description 3
- 231100000419 toxicity Toxicity 0.000 abstract description 3
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 description 10
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 6
- 230000002378 acidificating effect Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 5
- 238000010298 pulverizing process Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 150000004673 fluoride salts Chemical class 0.000 description 2
- 239000002585 base Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/002—Removing cores by leaching, washing or dissolving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/003—Removing cores using heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/005—Removing cores by vibrating or hammering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/006—Removing cores by abrasive, water or air blasting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a core removing method of a rare earth oxide core-shell structure ceramic core, which comprises the following steps: step 1, preparing shelling liquid; step 2, preparing core removing liquid; step 3, auxiliary shelling; step 4, neutralizing and cleaning with alkali liquor; step 5, auxiliary core removal; step 6, neutralizing and cleaning the acid liquor; and 7, repeating the operation of the step 3-6 for more than 2 times until the ceramic core in the titanium alloy casting is completely collapsed and removed, and obtaining the titanium alloy casting with the removed core. The core removing method has the following advantages and effects: (1) the price of the required raw materials is low; (2) The toxicity of chemicals used in the process of core removal is low; (3) The core removing process flow is simple, the core removing efficiency is high, the core removing time is short, and the operation can be completed within 24-36 hours; (4) The removal process can be carried out under normal pressure, and the defects of damage, abrasion and the like of the titanium alloy casting are avoided, thereby being beneficial to improving the integrity of the titanium alloy casting.
Description
Technical Field
The invention relates to the technical field of ceramic core removal, in particular to a core removal method for a rare earth oxide core-shell structure ceramic core.
Background
With the need for improved aeroengine performance, the engine turbine front inlet temperature has approached or exceeded the melting point of the turbine blade material, and therefore air cooling methods must be employed to cool the blades. At present, a ceramic core is commonly adopted to form a complex inner cavity structure of the high-temperature alloy air-cooled hollow blade in the casting process. After the turbine blade is cooled and molded, the ceramic core in the turbine blade is required to be removed to form an air channel, but the ceramic core has high mechanical strength and stability, hardly reacts with acid-base solution at normal temperature, and the ceramic core with a complex structure is often required to be removed through multiple processes. This not only increases the processing time, but also increases the damage to the titanium alloy castings, greatly limiting the production efficiency and yield of superalloy turbine hollow blades.
In order to overcome the above problems in the prior art, there are three main methods. The first method is to immerse the titanium alloy casting containing the ceramic core in molten fluoride salt, and the fluoride salt is dissolved in water so as to separate from the ceramic core, and the high-pressure water flushing can be used for assisting in accelerating the core separating speed, but the method is only applicable to alloy castings with simple structures and can cause damage to the titanium alloy casting; the second method is to use molten KOH or NaOH to core the titanium alloy casting. For example, chinese patent (publication No. 101229975 a) uses boiling water treatment in combination with a molten alkali reaction to perform decoring. This method can achieve a faster core release, but the loss to the titanium alloy castings is not negligible. The third is to use high concentration lye with ultrasound or heat to perform the decoring. For example, chinese patent (publication No. CN103752810 a) discloses a pressure stirring and core removing method, in which the core removing liquid is KOH, naOH or a mixture of both, and the alkali solution is boiled and the reaction product in the blade cavity is discharged by high temperature and alternately increasing and decreasing pressure. Although the process has less damage to the titanium alloy casting, the treatment time is longer, the core stripping is incomplete, and the efficiency is lower. In general, the method can be used for core removal, but has the problems of complex process flow, high resource consumption, easy damage to castings and the like.
With the development of high-temperature titanium alloy turbine casting technology, in order to restrain the influence of the ceramic core on the performance of the casting, a mullite rare earth oxide core-shell structure ceramic core is developed, and the core stripping difficulty is further increased. The fundamental problem in view of improving the core stripping efficiency of the ceramic core is improvement in the aspects of permeability of the core stripping liquid to the ceramic core, reactivity with the ceramic core, update speed of a reaction interface and the like. At present, some experience is accumulated in the application and research of the formula, the core removing process, the equipment and the like of the core removing liquid, but the problems of the updating speed of the permeation and reaction interface of the core removing liquid, the requirement of a high-pressure environment, the difficulty in controlling the technological parameters of the equipment and the like still exist. In addition, the core-removing method of the ceramic core with the core-shell structure needs to be considered, and related reports and patent publications are not yet found in the aspect. Therefore, it is necessary to explore other safer and more efficient core-removing methods for ceramic cores of core-shell structures.
Disclosure of Invention
The invention aims to provide a core removing method of a rare earth oxide core-shell structure ceramic core, which aims to solve the technical problems in the background technology.
In order to achieve the above object, the present invention provides the following technical solutions:
the core removing method of the rare earth oxide core-shell structure ceramic core comprises the following steps:
step 1, preparing shelling liquid: the shelling liquid comprises the following chemical components: 7-9mol/L nitric acid, 0.03-0.05mol/L penetrating agent and 0.03-0.05mol/L auxiliary agent;
and 2, preparing a core removing liquid, wherein the core removing liquid comprises the following chemical components: 10-16mol/LNaOH, KOH or mixed solution thereof, 0.05-0.1mol/L penetrating agent and 0.05-0.1mol/L auxiliary agent;
step 3, auxiliary shelling: placing the titanium alloy casting containing the ceramic core into the unshelling liquid in the step 1, heating the unshelling liquid to the temperature of 70-95 ℃, intermittently applying ultrasonic waves, accelerating the interface reaction speed based on cavitation and oscillation, and simultaneously promoting the diffusion of reactants and the dissolution of rare earth oxide shells;
step 4, neutralizing and cleaning with alkali liquor: placing the titanium alloy casting in the step 3 in 0.01mol/LNaOH solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
step 5, auxiliary core removal: putting the titanium alloy casting in the step 4 into the core removing liquid in the step 2, wherein the temperature of the core removing liquid is 80-100 ℃, and intermittently applying ultrasonic waves;
step 6, neutralization and cleaning of acid liquor: placing the titanium alloy casting in the step 5 in 0.01mol/L citric acid solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
and 7, repeating the operation of the step 3-6 for more than 2 times until the ceramic core in the titanium alloy casting is completely collapsed and removed, and obtaining the titanium alloy casting with the removed core.
Further, the penetrating agent in the step 1 comprises one or more of disodium EDTA, sodium dodecyl sulfonate and OEP-70.
Further, the auxiliary agent in the step 1 comprises one or more of citric acid, oxalic acid and ethylenediamine tetraacetic acid.
Further, the penetrating agent in the step 2 comprises one or more of disodium EDTA, sodium dodecyl sulfonate and OEP-70.
Further, the auxiliary agent in the step 2 comprises one or two of NaF and KF.
Further, the ultrasonic frequency in the step 3 and the step 5 is 40000Hz, and the power is 500W.
Compared with the prior art, the core removing method has the following advantages and effects:
(1) The price of the required raw materials is low, and chemicals used in the core removing process are low in price and easy to obtain, so that the core removing cost is reduced;
(2) The toxicity of chemicals used in the core removing process is low, the environmental pollution is reduced, and the operation safety is improved;
(3) The core removing process flow is simple, the core removing efficiency is high, the core removing time is short, and the operation can be completed within 24-36 hours;
(4) The removal process can be carried out under normal pressure, and the defects of damage, abrasion and the like of the titanium alloy casting are avoided, thereby being beneficial to improving the integrity of the titanium alloy casting.
Drawings
Fig. 1: the flow chart of the invention.
Detailed Description
The invention will be described in further detail with reference to the flowchart of the core removal method and the specific examples shown in fig. 1, but the content and embodiments of the invention are not limited thereto.
Example 1:
step 1, preparing shelling liquid: the shelling liquid comprises the following chemical components: 9mol/L nitric acid, 0.05mol/L penetrating agent and 0.05mol/L auxiliary agent. Wherein, the penetrating agent uses 0.02mol/LEDTA disodium, 0.01mol/L sodium dodecyl sulfonate and 0.02mol/LOEP-70, and the auxiliary agent uses 0.03mol/L citric acid, 0.01mol/L oxalic acid and 0.01mol/L ethylenediamine tetraacetic acid;
and 2, preparing a core removing liquid, wherein the core removing liquid comprises the following chemical components: 8mol/LNaOH, 8mol/LKOH, 0.1mol/L penetrant and 0.1mol/L auxiliary agent. Wherein, the penetrating agent uses 0.05mol/LEDTA disodium, 0.03mol/L sodium dodecyl sulfate and 0.02mol/LOEP-70, and the auxiliary agent uses 0.05mol/LNaF and 0.05mol/LKF;
step 3, auxiliary shelling: placing the titanium alloy casting containing the ceramic core into the acidic unshelling liquid in the step (1), heating the unshelling liquid, heating to 95 ℃, keeping the temperature for 10 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation, and simultaneously promoting the diffusion of reactants and the dissolution of rare earth oxide shells;
step 4, neutralizing and cleaning with alkali liquor: placing the titanium alloy casting in the step 3 in 0.01mol/LNaOH solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
step 5, auxiliary core removal: putting the titanium alloy casting treated in the step 4 into the alkaline core removing liquid in the step 2, heating the core removing liquid, heating to 100 ℃, keeping the temperature for 12 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation action, and simultaneously promoting the diffusion of reactants, thereby promoting the pulverization and the falling of mullite cores, and achieving the purpose of removing ceramic cores;
step 6, neutralization and cleaning of acid liquor: placing the titanium alloy casting in the step 5 in 0.01mol/L citric acid solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
and 7, repeating the operation of the step 3-6 for 2 times until the ceramic core in the titanium alloy casting is completely collapsed and removed, and obtaining the titanium alloy casting with the removed core.
Through X-ray perspective, the titanium alloy casting cavity has no residue, and the core is removed to be qualified.
Example 2:
step 1, preparing shelling liquid: the shelling liquid comprises the following chemical components: 7mol/L nitric acid, 0.03mol/L penetrating agent and 0.03mol/L auxiliary agent. Wherein, the penetrating agent uses 0.01mol/LEDTA disodium, 0.01mol/L sodium dodecyl sulfonate and 0.01mol/LOEP-70, and the auxiliary agent uses 0.01mol/L citric acid, 0.01mol/L oxalic acid and 0.01mol/L ethylenediamine tetraacetic acid;
and 2, preparing a core removing liquid, wherein the core removing liquid comprises the following chemical components: 10mol/LNaOH, 0.05mol/L penetrant and 0.05mol/L auxiliary agent. Wherein, the penetrating agent uses 0.03mol/LEDTA disodium and 0.02mol/L sodium dodecyl sulfonate, and the auxiliary agent uses 0.03mol/LNaF and 0.02mol/LKF;
step 3, auxiliary shelling: placing the titanium alloy casting containing the ceramic core into the acidic unshelling liquid in the step (1), heating the unshelling liquid and heating to 85 ℃, keeping the temperature for 10 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation, and simultaneously promoting the diffusion of reactants and the dissolution of rare earth oxide shells;
step 4, neutralizing and cleaning with alkali liquor: placing the titanium alloy casting in the step 3 in 0.01mol/LNaOH solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
step 5, auxiliary core removal: putting the titanium alloy casting treated in the step 4 into the alkaline core removing liquid in the step 2, heating the core removing liquid, heating to 80 ℃, keeping the temperature for 12 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation action, and simultaneously promoting the diffusion of reactants, thereby promoting the pulverization and the falling of mullite cores, and achieving the purpose of removing ceramic cores;
step 6, neutralization and cleaning of acid liquor: placing the titanium alloy casting in the step 5 in 0.01mol/L citric acid solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
and 7, repeating the operation of the step 3-6 for 3 times until the ceramic core in the titanium alloy casting is completely collapsed and removed, and obtaining the titanium alloy casting with the removed core.
Through X-ray perspective, the titanium alloy casting cavity has no residue, and the core is removed to be qualified.
Example 3
Step 1, preparing shelling liquid: the shelling liquid comprises the following chemical components: 8mol/L nitric acid, 0.05mol/L penetrating agent and 0.05mol/L auxiliary agent. Wherein, the penetrating agent uses 0.05mol/LEDTA disodium, and the auxiliary agent uses 0.05mol/L citric acid;
and 2, preparing a core removing liquid, wherein the core removing liquid comprises the following chemical components: 5mol/LNaOH, 6mol/LKOH, 0.1mol/L penetrant and 0.1mol/L auxiliary agent. Wherein, the penetrating agent uses 0.1mol/LEDTA disodium, and the auxiliary agent uses 0.1mol/LKF;
step 3, auxiliary shelling: placing the titanium alloy casting containing the ceramic core into the acidic unshelling liquid in the step (1), heating the unshelling liquid, heating to 95 ℃, keeping the temperature for 10 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation, and simultaneously promoting the diffusion of reactants and the dissolution of rare earth oxide shells;
step 4, neutralizing and cleaning with alkali liquor: placing the titanium alloy casting in the step 3 in 0.01mol/LNaOH solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
step 5, auxiliary core removal: putting the titanium alloy casting treated in the step 4 into the alkaline core removing liquid in the step 2, heating the core removing liquid, heating to 100 ℃, keeping the temperature for 15 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation action, and simultaneously promoting the diffusion of reactants, thereby promoting the pulverization and the falling of mullite cores, and achieving the purpose of removing ceramic cores;
step 6, neutralization and cleaning of acid liquor: placing the titanium alloy casting in the step 5 in 0.01mol/L citric acid solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
and 7, repeating the operation of the step 3-6 for 3 times until the ceramic core in the titanium alloy casting is completely collapsed and removed, and obtaining the titanium alloy casting with the removed core.
Through X-ray perspective, the titanium alloy casting cavity has no residue, and the core is removed to be qualified.
Example 4
Step 1, preparing shelling liquid: the shelling liquid comprises the following chemical components: 9mol/L nitric acid, 0.05mol/L penetrating agent and 0.05mol/L auxiliary agent. Wherein, the penetrating agent uses 0.02mol/LEDTA disodium, 0.01mol/L sodium dodecyl sulfonate and 0.02mol/LOEP-70, and the auxiliary agent uses 0.03mol/L citric acid, 0.01mol/L oxalic acid and 0.01mol/L ethylenediamine tetraacetic acid;
and 2, preparing a core removing liquid, wherein the core removing liquid comprises the following chemical components: 8mol/LNaOH, 8mol/LKOH, 0.1mol/L penetrant and 0.1mol/L auxiliary agent. Wherein, the penetrating agent uses 0.05mol/LEDTA disodium, 0.03mol/L sodium dodecyl sulfate and 0.02mol/LOEP-70, and the auxiliary agent uses 0.05mol/LNaF and 0.05mol/LKF;
step 3, auxiliary shelling: placing the titanium alloy casting containing the ceramic core into the acidic unshelling liquid in the step (1), heating the unshelling liquid, heating to 95 ℃, keeping the temperature for 10 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation, and simultaneously promoting the diffusion of reactants and the dissolution of rare earth oxide shells;
step 4, neutralizing and cleaning with alkali liquor: placing the titanium alloy casting in the step 3 in 0.01mol/LNaOH solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
step 5, auxiliary core removal: putting the titanium alloy casting treated in the step 4 into the alkaline core removing liquid in the step 2, heating the core removing liquid, heating to 95 ℃, keeping the temperature for 12 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation action, and simultaneously promoting the diffusion of reactants, thereby promoting the pulverization and the falling of mullite cores, and achieving the purpose of removing ceramic cores;
step 6, neutralization and cleaning of acid liquor: placing the titanium alloy casting in the step 5 in 0.01mol/L citric acid solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
and 7, repeating the operation of the step 3-6 for 2 times until the ceramic core in the titanium alloy casting is completely collapsed and removed, and obtaining the titanium alloy casting with the removed core.
Through X-ray perspective, the titanium alloy casting cavity has no residue, and the core is removed to be qualified.
Example 5
Step 1, preparing shelling liquid: the shelling liquid comprises the following chemical components: 9mol/L nitric acid, 0.05mol/L penetrating agent and 0.05mol/L auxiliary agent. Wherein, the penetrating agent uses 0.02mol/LEDTA disodium and 0.03mol/LOEP-70, and the auxiliary agent uses 0.03mol/L citric acid and 0.02mol/L oxalic acid;
and 2, preparing a core removing liquid, wherein the core removing liquid comprises the following chemical components: 16mol/LKOH, 0.1mol/L penetrant and 0.1mol/L auxiliary agent. Wherein, the penetrating agent uses 0.05mol/LEDTA disodium and 0.05mol/LOEP-70, and the auxiliary agent uses 0.1mol/LNaF;
step 3, auxiliary shelling: placing the titanium alloy casting containing the ceramic core into the acidic unshelling liquid in the step (1), heating the unshelling liquid, heating to 90 ℃, keeping the temperature for 10 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation, and simultaneously promoting the diffusion of reactants and the dissolution of rare earth oxide shells;
step 4, neutralizing and cleaning with alkali liquor: placing the titanium alloy casting in the step 3 in 0.01mol/LNaOH solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
step 5, auxiliary core removal: putting the titanium alloy casting treated in the step 4 into the alkaline core removing liquid in the step 2, heating the core removing liquid, heating to 80 ℃, keeping the temperature for 10 hours, intermittently applying ultrasonic waves, wherein the ultrasonic frequency is 40000Hz, the power is 500W, accelerating the interface reaction speed based on cavitation and oscillation action, and simultaneously promoting the diffusion of reactants, thereby promoting the pulverization and the falling of mullite cores, and achieving the purpose of removing ceramic cores;
step 6, neutralization and cleaning of acid liquor: placing the titanium alloy casting in the step 5 in 0.01mol/L citric acid solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
and 7, repeating the operation of the step 3-6 for 2 times until the ceramic core in the titanium alloy casting is completely collapsed and removed, and obtaining the titanium alloy casting with the removed core.
Through X-ray perspective, the titanium alloy casting cavity has no residue, and the core is removed to be qualified.
Compared with the prior art, the core removing method has the following advantages and effects:
(1) The price of the required raw materials is low, and chemicals used in the core removing process are low in price and easy to obtain, so that the core removing cost is reduced;
(2) The toxicity of chemicals used in the core removing process is low, the environmental pollution is reduced, and the operation safety is improved;
(3) The core removing process flow is simple, the core removing efficiency is high, the core removing time is short, and the operation can be completed within 24-36 hours;
(4) The removal process can be carried out under normal pressure, and the defects of damage, abrasion and the like of the titanium alloy casting are avoided, thereby being beneficial to improving the integrity of the titanium alloy casting.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (6)
1. The core removing method of the rare earth oxide core-shell structure ceramic core is characterized by comprising the following steps of:
step 1, preparing shelling liquid: the shelling liquid comprises the following chemical components: 7-9mol/L nitric acid, 0.03-0.05mol/L penetrating agent and 0.03-0.05mol/L auxiliary agent;
and 2, preparing a core removing liquid, wherein the core removing liquid comprises the following chemical components: 10-16mol/LNaOH, KOH or mixed solution thereof, 0.05-0.1mol/L penetrating agent and 0.05-0.1mol/L auxiliary agent;
step 3, auxiliary shelling: placing the titanium alloy casting containing the ceramic core into the unshelling liquid in the step 1, heating the unshelling liquid to the temperature of 70-95 ℃, intermittently applying ultrasonic waves, accelerating the interface reaction speed based on cavitation and oscillation, and simultaneously promoting the diffusion of reactants and the dissolution of rare earth oxide shells;
step 4, neutralizing and cleaning with alkali liquor: placing the titanium alloy casting in the step 3 in 0.01mol/L NaOH solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
step 5, auxiliary core removal: putting the titanium alloy casting in the step 4 into the core removing liquid in the step 2, wherein the temperature of the core removing liquid is 80-100 ℃, and intermittently applying ultrasonic waves;
step 6, neutralization and cleaning of acid liquor: placing the titanium alloy casting in the step 5 in 0.01mol/L citric acid solution with compressed air stirring for 10 minutes, taking out the titanium alloy casting, and placing the titanium alloy casting in clear water for cleaning for 5 minutes;
and 7, repeating the operation of the step 3-6 for more than 2 times until the ceramic core in the titanium alloy casting is completely collapsed and removed, and obtaining the titanium alloy casting with the removed core.
2. The method for removing the core of the rare earth oxide core-shell structure ceramic core according to claim 1, wherein the method comprises the following steps: the penetrating agent in the step 1 comprises one or more of EDTA disodium, sodium dodecyl sulfonate and OEP-70.
3. The method for removing the core of the rare earth oxide core-shell structure ceramic core according to claim 1, wherein the method comprises the following steps: the auxiliary agent in the step 1 comprises one or more of citric acid, oxalic acid and ethylenediamine tetraacetic acid.
4. The method for removing the core of the rare earth oxide core-shell structure ceramic core according to claim 1, wherein the method comprises the following steps: the penetrating agent in the step 2 comprises one or more of EDTA disodium, sodium dodecyl sulfonate and OEP-70.
5. The method for removing the core of the rare earth oxide core-shell structure ceramic core according to claim 1, wherein the method comprises the following steps: the auxiliary agent in the step 2 comprises one or two of NaF and KF.
6. The method for removing the core of the rare earth oxide core-shell structure ceramic core according to claim 1, wherein the method comprises the following steps: the ultrasonic frequency in the step 3 and the step 5 is 40000Hz, and the power is 500W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310105858.3A CN116441518A (en) | 2023-02-13 | 2023-02-13 | Core removing method for rare earth oxide core-shell structure ceramic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310105858.3A CN116441518A (en) | 2023-02-13 | 2023-02-13 | Core removing method for rare earth oxide core-shell structure ceramic core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116441518A true CN116441518A (en) | 2023-07-18 |
Family
ID=87132672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310105858.3A Pending CN116441518A (en) | 2023-02-13 | 2023-02-13 | Core removing method for rare earth oxide core-shell structure ceramic core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116441518A (en) |
-
2023
- 2023-02-13 CN CN202310105858.3A patent/CN116441518A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103752810B (en) | A kind of method and special equipment thereof that removes alumina based ceramic core | |
| CN102974767B (en) | Composite efficient ceramic core demolding process and special equipment thereof | |
| US4134777A (en) | Method for rapid removal of cores made of Y2 O3 from directionally solidified eutectic and superalloy materials | |
| CN107866550A (en) | A kind of ceramic core removal methods of aero-engine hollow blade | |
| CN103056605A (en) | Production method of high-density molybdenum crucible | |
| CN109724556A (en) | The recrystallization tendentiousness evaluation method of nickel-base high-temperature single crystal alloy hot investment casting process | |
| CN116441518A (en) | Core removing method for rare earth oxide core-shell structure ceramic core | |
| CN111390143B (en) | Normal-pressure removal method for ceramic core in titanium alloy casting of aircraft engine | |
| CN102337545A (en) | Rust remover for ultrasonically cleaning metal mould and preparation method thereof | |
| CN109136949A (en) | A method of removal titanium or titanium alloy sheet are with oxide skin | |
| CN112048727A (en) | Treatment method of nickel-based high-temperature alloy return material | |
| Kruglov et al. | Improvement of a technological process for ceramic core removal out of internal cavities of aircraft GTE turbine blade castings | |
| CN108746042B (en) | Cleaning method for single and polycrystalline silicon wafers cut by diamond wire saw | |
| CN207013682U (en) | A kind of precision-investment casting chill | |
| CN102962224B (en) | Method for cleaning parent polycrystalline carbon head material | |
| CN108889925B (en) | Aluminum oxide core decoring agent for directionally solidified blade and decoring method | |
| RU2158655C2 (en) | Method of removal of corundum and quartz- containing ceramic cores from internal hollows of castings | |
| CN113649598A (en) | SLM (selective laser melting) -based surface cleaning treatment method for formed metal and alloy sample thereof | |
| CN116037902A (en) | Ceramic core type shell removing device and method for high-temperature alloy precision casting | |
| CN111558705A (en) | Method for removing ceramic core with silicon dioxide content of more than 90 percent | |
| CN105937052B (en) | The method for removing single germanium wafer acid chemical attack rear surface blueness medicine print | |
| CN118106478A (en) | Core removing method for ceramic core in hollow turbine blade of aero-engine | |
| CN107127323B (en) | A kind of method and apparatus that ceramic core depoling efficiency can be improved | |
| CN108057849A (en) | The removal methods and equipment of ceramic core in a kind of aviation hollow blade | |
| US12042855B2 (en) | Systems, formulations, and methods for removal of ceramic cores from turbine blades after casting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |