CN110426255A - A method of detection hollow blade inner fifth wheel - Google Patents
A method of detection hollow blade inner fifth wheel Download PDFInfo
- Publication number
- CN110426255A CN110426255A CN201910665131.4A CN201910665131A CN110426255A CN 110426255 A CN110426255 A CN 110426255A CN 201910665131 A CN201910665131 A CN 201910665131A CN 110426255 A CN110426255 A CN 110426255A
- Authority
- CN
- China
- Prior art keywords
- hollow blade
- gadolinium nitrate
- detection
- blade inner
- wheel
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/05—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using neutrons
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention belongs to technical field of nondestructive testing, a kind of method of detection hollow blade inner fifth wheel for neutron photography, key step are disclosed are as follows: (1) prepare 10~20% gadolinium nitrate aqueous solution；(2) it is detected hollow blade to be put into gadolinium nitrate aqueous solution, is impregnated 6-8 hours in the case where vacuum degree is 0.07~0.09atm；(3) hollow blade is detected persistently to clean in the ultrasonic water tank of 24~64KHZ of frequency 5~15 minutes；(4) hollow blade is detected to dry in 80~100 DEG C.Pass through neutron photography by the hollow blade that this method is handled, hollow blade inner fifth wheel, including remaining type core can be effectively detected, remaining iron powder, the impurity that blade sucks after working long hours after powder filling detection.This method simple process, cost is relatively low, and testing result is accurate.Avoid the erroneous judgement and fail to judge that other detection methods may cause.
Description
Technical field
The invention belongs to technical field of nondestructive testing, are related to a kind of method for detecting hollow blade inner fifth wheel, specifically
Applied to the pretreatment before neutron photography to hollow blade.
Background technique
During precision-investment casting, the cooling duct of complicated, the tortuous detour of efficient air-cooled blade cavity shape need to be adopted
Formed with complex-shaped prefabricated ceramic core, cast efficient air-cooled blade key be it is cold to form blade interior complexity
But the preparation of the ceramic core in channel.Efficiently the cooling duct of air cooling blade interior is extremely complex, results in blade interior sky
The ceramic core shape of chamber is also extremely complex.Blade roughcast forms bore passages after depoling process, is frequently present of some residuals
Ceramic core, these residual fifth wheels in blade interior can block cooling duct, influence the unimpeded of internal cooling air, and lead
It causes to generate hot spot on blade to badly damaged blade, influences the safety of engine.It can just be used after needing thorough cleaning clean
On the engine.Therefore the blade after depoling must be detected, it is ensured that exist in internal cooling channel without Residual-type core,
To guarantee the quality of aero-engine and the safety of aircraft.Furthermore engine is working after a certain period of time, hollow blade therein
Inner cavity may be adsorbed with some impurity, also carry out the inspection of inner cavity fifth wheel before reuse.
Currently, the inspection of hollow blade inner fifth wheel mainly has 4 kinds of methods:
First method: roentgenography is current domestic a kind of the most widely used method.Hollow blade is in depoling
Afterwards, without any processing with regard to directly carrying out X-ray radiography.This method is detected on the spot convenient for castings production quotient, detection device at
This is lower, and speed is fast, is suitable for all manufacturers.The disadvantage is that ceramic core is little to the attenuation coefficient of X-ray, type core quilt
Surrounding air package and the contrast that metal is formed are smaller, and sensitivity is not high, easily causes the phenomenon that judging by accident and failing to judge.
Second method: powder filling roentgenography is anti-to X-ray using metal material, core material and filling metal powder
The difference answered determines the method for remaining type core.Hollow blade fills up particular requirement in blade interior channel first after depoling
Iron powder make to form biggish contrast with ceramic core to improve the detectability to residual core.Due to pouring into gold in bore passages
Belong to powder, casting is made to become the metal casting of an entity, the contrast of residual core and air is changed into pair of residual core and metal
Than contrast, the sensibility to X-ray is improved, detection effect is better than first method.The disadvantage is that if iron powder is filled
It is not fine and close to easily cause error detection, and if insert blade inner cavity in iron powder cannot all remove completely, will certainly make
The secondary effect of blade pair is made in the addition of the fifth wheel of Cheng Xin.
The third method: inside the method for peeping is a kind of quick and intuitive detection method, gos deep into blade with the conducting wire with probe
Bore passages in, the information of probe feedback to display judges whether remaining type core is deposited by observing the image of display
In.Suitable for the uncomplicated hollow blade in inner cavity.But for the hollow blade with complicated inner cavity structure, especially have thin
The hollow blade of wall, bending and multichannel is with regard to helpless.
Fourth method: hydrometry carries out flow to hollow blade by the blade flow detector specially manufactured and designed
It detects and compares with regulation flow to determine whether there is inner cavity fifth wheel, since there are also ceramic cores for the factor that influences flow
The local deformation of itself and the variation for leading to bore passages sectional area, therefore hydrometry not can determine that hollow blade inner
With the presence or absence of fifth wheel.
Currently, above four kinds of detection methods have use in aero-engine factory, China, but it all cannot achieve hollow blade
The accurate detection of inner cavity fifth wheel.
Summary of the invention
The purpose of the present invention is: it is asked for the technology accurately detected that cannot achieve hollow blade inner fifth wheel at present
Topic proposes a kind of method for detecting hollow blade inner fifth wheel, to be used for subsequent neutron photography.
To solve this technical problem, the technical scheme is that
A method of detection hollow blade inner fifth wheel, the method for the detection hollow blade inner fifth wheel exist
Before neutron photography comprising the steps of:
Step 1: preparing 10~20% gadolinium nitrate soak；
Step 2: hollow blade is submerged the gadolinium nitrate soak, hollow blade 4- is persistently impregnated under vacuum conditions
10 hours；
Step 3: continuing hollow blade 5-20 minutes after cleaning and dipping in ultrasonic water tank；
Step 4: drying hollow blade and being cooled to room temperature.
The step 1 concrete operations: it is mixed evenly according to gadolinium nitrate with water quality ratio for 0.11~0.25, to nitre
After sour gadolinium completely dissolves in water, soak is obtained.
Concrete operations in step 2 are as follows: container is put into vacuum tank by the temperature for controlling soak, is opened vacuum pump, is held
It is continuous to impregnate hollow blade.
The temperature of the soak is 15 DEG C~35 DEG C；The vacuum condition are as follows: vacuum degree 0.07-0.09atm；It is described
Hollow blade persistently impregnates 6-8 hours.Vacuum degree and soaking time determine that the amount of gadolinium element is received in remaining type wicking, and vacuum degree is
0.07-0.09atm；Hollow blade persistently impregnates 6-8 hours, and remaining type core can absorb enough gadolinium elements and guarantee neutron photography
Quality, and can guarantee high working efficiency.
Ultrasonic frequency described in step 3 is 24~64KHZ.When ultrasonic frequency is lower than 24 KHZ, hollow blade inner wall
On soak be unable to get effective cleaning, be higher than 64KHZ when, can to remaining type wick receive gadolinium element impact.
Scavenging period 5-15 minutes described in step 3.When being lower than 5 minutes between when purged, the soak of inner cavity can not be cleaned
Completely, it easily causes to judge by accident.It is too long between when purged, when being higher than 20 minutes, then it is clear remaining type may to be wicked to the gadolinium element received
It washes off, will cause the phenomenon that failing to judge.
Concrete operations are dried in step 4: persistently being dried in 80~100 DEG C of drying box；Drying time is 1~2 small
When.
The gadolinium nitrate is six hydrate of gadolinium nitrate；Its purity is more than or equal to 99%.
The beneficial effects of the present invention are: the present invention applies very extensive and cheap six aquation of gadolinium nitrate using market
Tracer of the object as neutron photography is closed, by the technological parameter in proportion optimizing and control soaking process to reach optimal leaching
Steep effect.This method simple process and low cost, without changing the mill sheet and process of existing hollow blade, tracer
Noresidue, testing result are accurate.Avoid the erroneous judgement and fail to judge that other detection methods may cause.The present invention is as neutron photography
Preposition preprocess method, be successfully applied to hollow blade inner fifth wheel detection field.
Detailed description of the invention
It, below will be to be used to being needed in example of the invention in order to illustrate more clearly of the technical solution that the present invention is implemented
Attached drawing makees simple explain.It is clear that drawings described below is only some embodiments of the present invention, for this field
Technical staff for, without creative efforts, be also possible to obtain other drawings based on these drawings.
Fig. 1 is mass attentuation coefficient schematic diagram of the different elements to neutron and X-ray；
Fig. 2 is that neutron photography detects the extra object image schematic diagram of hollow blade inner.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment is
A part of the embodiments of the present invention, rather than whole embodiments.Based on the embodiments of the present invention, the ordinary skill people of this field
Without making creative work, every other embodiment obtained shall fall within the protection scope of the present invention member.
The feature of the various aspects of the embodiment of the present invention is described more fully below.In the following detailed description, it proposes
Many concrete details, so as to complete understanding of the present invention.But for those of ordinary skill in the art, very bright
Aobvious, the present invention can also be implemented in the case where not needing these details.Below to the description of embodiment
Just for the sake of being better understood by showing example of the invention to the present invention.The present invention is not limited to presented below any
Specific setting and method, but cover all product structures covered without departing from the spirit of the invention, method
Any improvement, replacement etc..
In each attached drawing and following description, well known structure and technology is not shown, is caused to avoid to the present invention
It is unnecessary fuzzy.
Neutron and the interaction of substance are unrelated with electronics, relate only to material atom core and its internal structure, therefore in
The functional relation that the atomic number of sub- ray mass attenuation coefficient and substance does not determine.Neutron and X are penetrated from Fig. 1 difference element
The mass attentuation coefficient figure of line is it can be found that gadolinium element (Gd) is the largest the absorptivity of neutron.Hollow blade inner is extra
Object is not strong for the decaying of neutron ray, if added in hollow blade inner fifth wheel very strong to neutron ray attenuation
Gadolinium element can theoretically enhance hollow blade inner fifth wheel centering as the tracer of display hollow blade inner fifth wheel
The decaying of sub- ray improves neutron ray to the detectability of hollow blade inner fifth wheel.
Specific step is as follows for the method for detection hollow blade inner fifth wheel of the invention:
The gadolinium nitrate aqueous solution of 1.1 preparations 10~20% is 0.11~0.25 according to gadolinium nitrate and water quality ratio, by nitric acid
Gadolinium is mixed with water, is stirred evenly, and after six hydrate of gadolinium nitrate completely dissolves in water, obtains gadolinium nitrate soak.Wherein
Gadolinium nitrate selects six hydrate of gadolinium nitrate, and purity is more than or equal to 99%.
1.2, hollow blade is immersed in the gadolinium nitrate soak that step 1 obtains to and is submerged completely soak, control leaching
The temperature for steeping liquid is 15 DEG C~35 DEG C, and container is put into vacuum tank, vacuum pump is opened, vacuum degree remains 0.07-0.09atm
Under, hollow blade takes out after persistently impregnating 6-8 hours.
Hollow blade after immersion is put into the ultrasonic water tank of 24~64KHZ of frequency and persistently cleans 5-15 minutes by 1.3
After take out, be put into 80~100 DEG C of drying box and persistently dry 1 hour, then hollow blade is cooled to room temperature.
By the hollow blade that the above process is handled, neutron photography can be just carried out.Two are illustrated in figure 2 by above-mentioned
Hollow blade after step process, it can be seen that left side blade after above-mentioned steps are handled due to there is no the presence of gadolinium element,
It may determine that there is no remaining type cores；The position that right side blade is indicated, since the presence of gadolinium element absorbs neutron energy, from
And judge there is remaining type core, as shown in circle in Fig. 2 two.
Specific embodiment is as follows:
Embodiment 1
The gadolinium nitrate aqueous solution of 1.1 preparations 10% is 0.11 according to gadolinium nitrate and water quality ratio, by six hydrate of gadolinium nitrate
Object is mixed with water, is stirred evenly, and after six hydrate of gadolinium nitrate completely dissolves in water, obtains soak.Wherein gadolinium nitrate
The purity of six hydrates is 99% or more.
1.2, hollow blade is immersed in the gadolinium nitrate soak that step 1 obtains to and is submerged completely soak, control leaching
The temperature for steeping liquid is 24 DEG C, and container is put into vacuum tank, opens vacuum pump, and vacuum degree is maintained at as under 0.09atm, hollow leaf
Piece takes out after persistently impregnating 6 hours.
Hollow blade after immersion is put into and continues to take out after ten minutes in the ultrasonic water tank of frequency 64KHZ by 1.3, is put into
It is persistently dried in 90 DEG C of drying box 1 hour, then hollow blade is cooled to room temperature.
Embodiment 2
The gadolinium nitrate aqueous solution of 1.1 preparations 20% is 0.25 according to gadolinium nitrate and water quality ratio, by six hydrate of gadolinium nitrate
Object is mixed with water, is stirred evenly, and after six hydrate of gadolinium nitrate completely dissolves in water, obtains soak.Wherein gadolinium nitrate
The purity of six hydrates is 99% or more.
1.2, hollow blade is immersed in the gadolinium nitrate soak that step 1 obtains to and is submerged completely soak, control leaching
The temperature for steeping liquid is 35 DEG C, and container is put into vacuum tank, opens vacuum pump, and vacuum degree is maintained at as under 0.07atm, hollow leaf
Piece takes out after persistently impregnating 8 hours.
1.3 the hollow blade after immersion is put into continue 15 minutes in the ultrasonic water tank of frequency 24KHZ after take out, be put into
It is persistently dried in 100 DEG C of drying box 1 hour, then hollow blade is cooled to room temperature.
Embodiment 3
The gadolinium nitrate aqueous solution of 1.1 preparations 15% is 0.176 according to gadolinium nitrate and water quality ratio, by six hydrate of gadolinium nitrate
Object is mixed with water, is stirred evenly, and after six hydrate of gadolinium nitrate completely dissolves in water, obtains soak.Wherein gadolinium nitrate
The purity of six hydrates is 99% or more.
1.2, hollow blade is immersed in the gadolinium nitrate soak that step 1 obtains to and is submerged completely soak, control leaching
The temperature for steeping liquid is 15 DEG C, and container is put into vacuum tank, opens vacuum pump, and vacuum degree is maintained at as under 0.08atm, hollow leaf
Piece takes out after persistently impregnating 7 hours.
1.3 the hollow blade after immersion is put into continue 13 minutes in the ultrasonic water tank of frequency 48KHZ after take out, be put into
It is persistently dried in 80 DEG C of drying box 1 hour, then hollow blade is cooled to room temperature.
Embodiment 4
The gadolinium nitrate aqueous solution of 1.1 preparations 15% is 0.176 according to gadolinium nitrate and water quality ratio, by six hydrate of gadolinium nitrate
Object is mixed with water, is stirred evenly, and after six hydrate of gadolinium nitrate completely dissolves in water, obtains soak.Wherein gadolinium nitrate
The purity of six hydrates is 99% or more.
1.2, hollow blade is immersed in the gadolinium nitrate soak that step 1 obtains to and is submerged completely soak, control leaching
The temperature for steeping liquid is 15 DEG C, and container is put into vacuum tank, opens vacuum pump, and vacuum degree is maintained at as under 0.08atm, hollow leaf
Piece takes out after persistently impregnating 10 hours.
1.3 the hollow blade after immersion is put into continue 13 minutes in the ultrasonic water tank of frequency 24KHZ after take out, be put into
It is persistently dried in 80 DEG C of drying box 1 hour, then hollow blade is cooled to room temperature.
Embodiment 5
The gadolinium nitrate aqueous solution of 1.1 preparations 15% is 0.176 according to gadolinium nitrate and water quality ratio, by six hydrate of gadolinium nitrate
Object is mixed with water, is stirred evenly, and after six hydrate of gadolinium nitrate completely dissolves in water, obtains soak.Wherein gadolinium nitrate
The purity of six hydrates is 99% or more.
1.2, hollow blade is immersed in the gadolinium nitrate soak that step 1 obtains to and is submerged completely soak, control leaching
The temperature for steeping liquid is 15 DEG C, and container is put into vacuum tank, opens vacuum pump, and vacuum degree is maintained at as under 0.09atm, hollow leaf
Piece takes out after persistently impregnating 4 hours.
1.3 the hollow blade after immersion is put into continue 13 minutes in the ultrasonic water tank of frequency 48KHZ after take out, be put into
It is persistently dried in 80 DEG C of drying box 1 hour, then hollow blade is cooled to room temperature.
Finally it should be noted that: the above embodiments are merely illustrative of the technical solutions of the present invention, but protection of the invention
Range is not limited thereto, and anyone skilled in the art in the technical scope disclosed by the present invention, can be thought easily
It is modified or replaceed to various equivalent, these, which are modified or replaceed, should all be included within the scope of the present invention.
Claims (10)
1. a kind of method for detecting hollow blade inner fifth wheel, the method for the detection hollow blade inner fifth wheel is in
Before son photograph, it is characterised in that: comprise the steps of:
Step 1: preparing 10~20% gadolinium nitrate soak；
Step 2: hollow blade is submerged the gadolinium nitrate soak, it is small that hollow blade 4-10 is persistently impregnated under vacuum conditions
When；
Step 3: continuing hollow blade 5-20 minutes after cleaning and dipping in ultrasonic water tank；
Step 4: drying hollow blade and being cooled to room temperature.
2. the method for detection hollow blade inner fifth wheel according to claim 1, it is characterised in that: the step 1 tool
Gymnastics conduct: it is uniformly mixed according to gadolinium nitrate with water quality ratio for 0.11~0.25, gadolinium nitrate soak is made.
3. the method for detection hollow blade inner fifth wheel according to claim 1, it is characterised in that: described in step 2
The temperature of soak is 15 DEG C~35 DEG C.
4. the method for detection hollow blade inner fifth wheel according to claim 1, it is characterised in that: described in step 2
Vacuum condition are as follows: vacuum degree 0.07-0.09atm.
5. the method for detection hollow blade inner fifth wheel according to claim 4, it is characterised in that: the hollow blade
Persistently impregnate 6-8 hours.
6. the method for detection hollow blade inner fifth wheel according to claim 1, it is characterised in that: surpass described in step 3
Frequency of sound wave is 24~64KHZ.
7. the method for detection hollow blade inner fifth wheel according to claim 6, it is characterised in that: the scavenging period
5-15 minutes.
8. the method for detection hollow blade inner fifth wheel according to claim 1, it is characterised in that: dried in step 4
Concrete operations: it is persistently dried in 80~100 DEG C of drying box.
9. the method for detection hollow blade inner fifth wheel according to claim 2, it is characterised in that: the gadolinium nitrate
For six hydrate of gadolinium nitrate；Its purity is more than or equal to 99%.
10. the method for detection hollow blade inner fifth wheel according to claim 8, it is characterised in that: when the drying
Between be 1~2 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910665131.4A CN110426255A (en) | 2019-07-22 | 2019-07-22 | A method of detection hollow blade inner fifth wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910665131.4A CN110426255A (en) | 2019-07-22 | 2019-07-22 | A method of detection hollow blade inner fifth wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110426255A true CN110426255A (en) | 2019-11-08 |
Family
ID=68411895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910665131.4A Pending CN110426255A (en) | 2019-07-22 | 2019-07-22 | A method of detection hollow blade inner fifth wheel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110426255A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525933A (en) * | 2020-11-03 | 2021-03-19 | 中国航发北京航空材料研究院 | Reference line determination method for hollow blade residual core neutron detection sensitivity |
-
2019
- 2019-07-22 CN CN201910665131.4A patent/CN110426255A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| CHEUL MUU SIM ET AL: "《Detecting Internal Hot Corrosion of In-service Turbine Blades Using Neutron Tomography with Gd Tagging》", 《J NONDESTRUCT EVAL》 * |
| WEI-MIN CHIA ET AL: "《Case studies of neutron radiography examination at INER》", 《NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH A》 * |
| 郭广平 等: "《中子照相技术及其在无损检测中的应用研究》", 《失效分析与预防》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525933A (en) * | 2020-11-03 | 2021-03-19 | 中国航发北京航空材料研究院 | Reference line determination method for hollow blade residual core neutron detection sensitivity |
| CN112525933B (en) * | 2020-11-03 | 2022-05-27 | 中国航发北京航空材料研究院 | Reference line determination method for hollow blade residual core neutron detection sensitivity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104008956B (en) | Opening method for flip chip devices | |
| CN110426255A (en) | A method of detection hollow blade inner fifth wheel | |
| US5242007A (en) | X-ray detection of residual ceramic material inside hollow metal articles | |
| CN113848174B (en) | Electrochemical corrosion test device under boiling and strong corrosive solution environment and application thereof | |
| JP2001133208A (en) | Method of obtaining thickness of layer composed of oxide material on coated surface of nuclear fuel rod | |
| CN109100772B (en) | Online analysis monitoring method and device for spent fuel dissolving process | |
| JP2001141864A (en) | Method for measuring thickness of cladding layer formed on nuclear fuel rod surface and including ferromagnetic material | |
| CN107418789A (en) | Nuclear facilities radioactive pollution detergent and decontamination method | |
| US2873238A (en) | Method of making jacketed fissionable slug | |
| CN117740221A (en) | Titanium alloy stress detection device for aeroengine | |
| Hensley | Adsorption of Tagged Phosphute Ions on Glass Surfaces as Related to Alkaline Attack | |
| CN108845078A (en) | Station boiler high temperature component creep life prediction technique | |
| CN111024800A (en) | Method for confirming relation between pH value and uranium dissolving capacity in fluid | |
| US5167734A (en) | Process for identification evaluation and removal of microshrinkage | |
| CN110132872A (en) | A kind of irrigation water heavy metal in water detection method | |
| CN216771404U (en) | Concrete detection water content detection device | |
| US20090065023A1 (en) | Microwave assisted post-FPI cleaning method | |
| JPS5847252A (en) | Detecting method for flaw in welded part of reaction tube by ultrasonic flaw detection | |
| US3698467A (en) | Method of removing silaceous cores from nickel and cobalt superalloy castings | |
| CN218653068U (en) | Calibration device for pressurized fluid extraction instrument | |
| CN219891015U (en) | Cooling liquid corrosion testing device | |
| CN219891045U (en) | Concrete sulfate-resistant dry-wet circulation test box | |
| CN221883615U (en) | Pressure device for total phosphorus and total nitrogen tester | |
| JP4341167B2 (en) | Pressure test method for reactor pressure vessels | |
| CN211718069U (en) | Bituminous mixture acid and alkali resistance testing arrangement |
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 | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20211229 Address after: 550014 shawen ecological science and Technology Industrial Park, Baiyun District, Guiyang City, Guizhou Province Applicant after: GUIYANG HANGFA PRECISION CASTING Co.,Ltd. Address before: Science and technology development department, No.81 box, Haidian District, Beijing 100095 Applicant before: AECC BEIJING INSTITUTE OF AERONAUTICAL MATERIALS |
|
| TA01 | Transfer of patent application right | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191108 |
|
| RJ01 | Rejection of invention patent application after publication |