CN107884324A - A kind of liquid-propellant rocket engine graphite material porosity method of testing - Google Patents
A kind of liquid-propellant rocket engine graphite material porosity method of testing Download PDFInfo
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- CN107884324A CN107884324A CN201710942010.0A CN201710942010A CN107884324A CN 107884324 A CN107884324 A CN 107884324A CN 201710942010 A CN201710942010 A CN 201710942010A CN 107884324 A CN107884324 A CN 107884324A
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- 239000007770 graphite material Substances 0.000 title claims abstract description 45
- 239000003380 propellant Substances 0.000 title claims abstract description 11
- 238000010998 test method Methods 0.000 title claims abstract description 10
- 230000007547 defect Effects 0.000 claims abstract description 20
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 7
- 238000010191 image analysis Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 9
- 230000003044 adaptive effect Effects 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 15
- 238000012360 testing method Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007619 statistical method Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013079 data visualisation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30168—Image quality inspection
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- Quality & Reliability (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Immunology (AREA)
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- Analysing Materials By The Use Of Radiation (AREA)
Abstract
It is as follows with graphite material porosity method of testing, including step the invention discloses a kind of liquid-propellant rocket engine：1) the volume V of graphite material is measured；2) Microfocus X-ray X-ray machine is used, high-precision Non-Destructive Testing is carried out to product, and three-dimensional reconstruction is carried out to testing result by YXLON CT softwares, obtains threedimensional model；3) threedimensional model is imported into progress defect image analysis in analysis software VG Studio MAX, calculates internal defects volume V1、V2……Vn；4) above-mentioned Non-Destructive Testing image analysis result is based on, calculates the porosity of graphite material.Method of testing disclosed in this invention can accurately obtain the porosity of graphite material, and method is simple and reliable, and to product without destructiveness.
Description
Technical field
The invention belongs to liquid-propellant rocket engine field, is related to a kind of liquid-propellant rocket engine graphite material porosity and surveys
Method for testing.
Background technology
Significant components of the end face seal as liquid-propellant rocket engine turbine pump power transfer system, are mainly used in sealing fluid
Body oxidant, fuel and isolation combustion gas etc., main material of the graphite as end face seal friction pair is hidden if there is quality
Suffer from, break down, the Performance And Reliability of engine will be directly influenced, or even produce catastrophic effect.Especially for me
For the big delivery liquid oxygen kerosene engine turbine pump end face seal of a new generation of state, running parameter improves constantly, vibratory impulse environment
It is extremely severe, and working media has the characteristics that high pressure, low temperature, deep-etching, causes end face seal friction pair working environment pole
For harshness, therefore high requirement is proposed to the quality of graphite material.End face using graphite as crucial friction pair material at present
Sealing is most important sealing mode in liquid-propellant rocket engine turbine pump, and the reinspection index of conventional graphite material is hard for Shore
Degree, rupture strength, compression strength, apparent porosity and bulk density, the wherein porosity are to influence graphite material mechanical performance
Basic factor, if the porosity is bigger than normal, it will cause that graphite material matrix is loose, space is more, coarse grains, density unevenness etc. are asked
Topic, and mechanical strength reduces.Under the working environments such as high speed, high pressure, vibratory impulse, high-temperature gradient and Strong oxdiative, if stone
The porosity of ink material is unqualified, can wear, come off in the course of the work, broken even catching fire equivalent risk.Therefore,
In order to ensure the reliability of engine, the porosity of graphite material need to be accurately controlled.
Graphite material internal voids are divided into open type and closed type, at present generally use water-boiling method rough calculation open pore
The size of rate, and closed porosity can only indirectly in the form of density react, can not accurate response graphite material internal voids,
Larger quality risk be present.
Through retrieval, JB-T 8133.15-2013《The part of electric carbon product physical and chemical performance test method the 15th：The porosity》
A kind of method of testing of the complete opening porosity is proposed, graphite products need to be processed into small sample by this method, cross 70 mesh (0.224mm)
Standard screen is screened, precision deficiency, and immersion method is consistent with above-mentioned water-boiling method principle, can not detect micro- inside sample
Spilehole；There is the characteristics of density unevenness, anisotropy in view of graphite material, the porosity of every graphite material product is deposited
In otherness, this method only shows the average porosity of sample regional area, and error is larger.
The content of the invention
In order to solve the problems, such as in background technology, the present invention propose it is a kind of to measurement graphite material without damaging and measure
Precision high liquid-propellant rocket engine graphite material porosity method of testing.
The technical scheme is that：
The invention provides a kind of liquid-propellant rocket engine graphite material porosity method of testing, comprise the following steps：
1) the volume V of graphite material is measured；
2) using Microfocus X-ray X-ray machine according to crackle of the graphite material density variation to be measured to graphite material, space progress height
Precision defects detection forms data message, and carries out three-dimensional reconstruction to the data message of detection by YXLON-CT softwares, obtains
The threedimensional model of graphite material to be measured；
3) threedimensional model is imported into VG Studio MAX softwares, carries out defect image analysis；
Wherein, the Noise reduction (noise reduction) in VG Studio MAX softwares are set as High adaptive
(high-adaptive)；
Probability criterion (probabilistic standard) are General (routine)；
Probability threshold (probability threshold value) are arranged to 0.1,
Graphite material volume defect V is calculated by VG Studio MAX softwares1、V2……Vn；
4) volume defect obtained according to step 3), the porosity P of graphite material is calculated：
Specifically, the Microfocus X-ray X-ray machine parameter is arranged to：Voltage is 220kV, electric current 0.3mA, and the time of integration is
400ms, filter disc are 0.5mm aluminium flakes；Non-Destructive Testing minimum Flaw detectability requirement≤0.05mm of Microfocus X-ray X-ray machine.
The advantage of the invention is that：
The present invention carries out high-precision defects detection by using Microfocus X-ray X-ray machine and VG Studio MAX softwares, to graphite
The defects of material, carries out statistical analysis, relative to the method for testing of the conventional open porosity, can obtain internal closed type stomata
Defective value；Relative to the method for testing of the JB-T 8133.15-2013 complete opening porosity, without carrying out destruction processing to product,
By the Non-Destructive Testing to actual product, the problems such as can effectively exclusion because of graphite material density unevenness and anisotropy, lead
The inaccuracy problem of spot sample detection is caused, accuracy of detection can reach micron order, and method is simple and reliable, and to product without destruction
Property.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of method of testing；
Fig. 2 is graphite material defect statistical analysis figure in embodiment.
Embodiment
A specific embodiment is used below, and the method for the present invention is introduced：
The method of the present invention as shown in Figure 1, comprises the following steps：
1) the volume V=244.10175mm of graphite material to be measured is measured first3；
2) Microfocus X-ray X-ray machine is used, Non-Destructive Testing is carried out to graphite material, first, sets the parameter of Microfocus X-ray X-ray machine：
Setting voltage is 220kV, electric current 0.3mA, time of integration 400ms, and filter disc chooses 0.5mm aluminium flakes, minimum defects detection energy
Power is 0.049mm, carries out three-dimensional reconstruction to testing result by YXLON-CT softwares, obtains the three-dimensional mould of graphite material to be measured
Type；
3) threedimensional model is imported into progress defect image analysis in analysis software VG Studio MAX, defect statistics point
It is as shown in Figure 2 to analyse result；
Wherein, set in VG Studio MAX Noise reduction (noise reduction) as High adaptive (it is high-from
Adapt to)；
Probability criterion (probabilistic standard) are General (routine)；
Probability threshold (probability threshold value) are arranged to 0.1,
It is as shown in table 1 to calculate graphite material defect volume, wherein the big smallest number of defect volume and graphite material species, chi
Very little grade is relevant, and the data of each graphite material are different, can not be predicted in advance in detection process, is to use VG Studio
MAX softwares are calculated, and quantity is 65 the defects of graphite material in the present embodiment.
Wherein, VG Studio MAX are a high end softwares for being exclusively used in CT data visualizations and analysis, are led in industry CT
Domain is widely used.
The graphite material defect volume of table 1
4) above-mentioned Non-Destructive Testing image analysis result is based on, calculates the porosity P of graphite material：
This method to product without carrying out destructive processing, you can more accurately obtains the porosity of graphite material, keeps away
Exempt from the conventional inaccuracy detected using the complete opening porosity in the single opening porosity and JB-T 8133.15-2013 to ask
Topic.
Claims (2)
- A kind of 1. liquid-propellant rocket engine graphite material porosity method of testing, it is characterised in that：Comprise the following steps：1) the volume V of graphite material is measured；2) using Microfocus X-ray X-ray machine according to crackle of the graphite material density variation to be measured to graphite material, space progress high accuracy Defects detection forms data message, and carries out three-dimensional reconstruction to the data message of detection by YXLON-CT softwares, obtains to be measured The threedimensional model of graphite material；3) threedimensional model is imported into VG Studio MAX softwares, carries out defect image analysis；Wherein, the Noise reduction in VG Studio MAX softwares are set as High adaptive；Probability criterion are General；Probability threshold are arranged to 0.1,Graphite material volume defect V is calculated by VG Studio MAX softwares1、V2……Vn；4) volume defect obtained according to step 3), the porosity P of graphite material is calculated：<mrow> <mi>P</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>V</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>V</mi> <mn>2</mn> </msub> <mo>+</mo> <mo>...</mo> <mo>...</mo> <mo>+</mo> <msub> <mi>V</mi> <mi>n</mi> </msub> </mrow> <mi>V</mi> </mfrac> <mo>.</mo> </mrow>
- 2. a kind of liquid-propellant rocket engine according to claim 1 graphite material porosity method of testing, its feature exist In：The Microfocus X-ray X-ray machine parameter is arranged to：Voltage is 220kV, electric current 0.3mA, time of integration 400ms, and filter disc is 0.5mm aluminium flakes；Non-Destructive Testing minimum Flaw detectability requirement≤0.05mm of Microfocus X-ray X-ray machine.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556963A (en) * | 2020-12-07 | 2021-03-26 | 西安航天动力研究所 | Displacement speed double-parameter control end face sealing structure collision test system |
| CN113329846A (en) * | 2019-02-01 | 2021-08-31 | 株式会社则武 | Metal bond grindstone for high-hardness brittle material |
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2017
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113329846A (en) * | 2019-02-01 | 2021-08-31 | 株式会社则武 | Metal bond grindstone for high-hardness brittle material |
| CN113329846B (en) * | 2019-02-01 | 2024-01-02 | 株式会社则武 | Metal bond grindstone for high-hardness brittle material |
| CN112556963A (en) * | 2020-12-07 | 2021-03-26 | 西安航天动力研究所 | Displacement speed double-parameter control end face sealing structure collision test system |
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