CN103343255B - Method for increasing sound absorption coefficient of FeCrAl fibrous porous material - Google Patents
Method for increasing sound absorption coefficient of FeCrAl fibrous porous material Download PDFInfo
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- CN103343255B CN103343255B CN201310303745.0A CN201310303745A CN103343255B CN 103343255 B CN103343255 B CN 103343255B CN 201310303745 A CN201310303745 A CN 201310303745A CN 103343255 B CN103343255 B CN 103343255B
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Abstract
The invention discloses a method for increasing the sound absorption coefficient of a FeCrAl fibrous porous material. The method comprises the steps of soaking a cleaned FeCrAl fibrous porous material in a NaOH aqueous solution with the concentration of 0.1-1.0 mol/L for 1-10 h, and cleaning and drying the FeCrAl fibrous porous material after the FeCrAl fibrous porous material is taken out, thereby obtaining the FeCrAl fibrous porous material with the sound absorption coefficient which is increased by 0.2-0.4 compared with that of the unsoaked FeCrAl fibrous porous material. The method disclosed by the invention is simple, and the concrete features of the surface microstructure of fibers can be controlled through adjusting preparation processes. According to the method, starting from changing the surface microstructure of the fibers, NaOH is adopted to corrode the FeCrAl fibrous porous material, and a clustered feathery protrusion structure is formed on the surface of the fibers, so that the sound absorption coefficient of the FeCrAl fibrous porous material in a full-frequency range can be increased effectively and is not restricted to the thickness of samples, and then, the application range of the FeCrAl fibrous porous material is enlarged.
Description
Technical field
The invention belongs to sound-absorbing porous material technical field, be specifically related to a kind of method improving FeCrAl textile porous materials sound absorption coefficient.
Background technology
The advantages such as FeCrAl textile porous materials is high with its intensity, humidity, high temperature resistant, not yielding, hole shape structure-controllable, the sqouynd absorption lowering noise demand of extreme environment can be met, FeCrAl textile porous materials is used for aircraft engine noise reduction by such as Boeing, achieve significant effect, in undersea boat noise reduction field, FeCrAl textile porous materials also has obvious advantage.
In order to improve the sound absorbing capabilities of FeCrAl textile porous materials, investigator attempts the method that have employed the adjustment material macrostructure parameters such as porosity gradient structure, achieves certain effect.But this method limitation is very large, such as, be difficult to improve low frequency absorption coefficient and be difficult to apply in thinner space.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of method improving FeCrAl textile porous materials sound absorption coefficient.The method is started with from change fiber surface microtexture, NaOH is adopted to corrode FeCrAl textile porous materials, the featheriness thrust structure of cluster is obtained at fiber surface, effectively can improve the sound absorption coefficient in FeCrAl textile porous materials whole frequency range, and not test sample thin and thick restriction, expands the range of application of FeCrAl textile porous materials.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of method improving FeCrAl textile porous materials sound absorption coefficient, it is characterized in that, the method is: the FeCrAl textile porous materials cleaned up being placed in concentration is that the NaOH aqueous solution of 0.1mol/L ~ 1.0mol/L soaks 1h ~ 10h, cleaning, drying after taking out, obtains sound absorption coefficient than the FeCrAl textile porous materials improving 0.2 ~ 0.4 before immersion.
A kind of above-mentioned method improving FeCrAl textile porous materials sound absorption coefficient, described in the fiber string diameter of FeCrAl textile porous materials that cleans up be Φ 6 μm ~ Φ 40 μm, porosity is 80% ~ 95%.
A kind of above-mentioned method improving FeCrAl textile porous materials sound absorption coefficient, described in the thickness of FeCrAl textile porous materials that cleans up be 3mm ~ 30mm.
A kind of above-mentioned method improving FeCrAl textile porous materials sound absorption coefficient, the concentration of the described NaOH aqueous solution is 0.5mol/L, and the time of described immersion is 5h.
A kind of above-mentioned method improving FeCrAl textile porous materials sound absorption coefficient, described sound absorption coefficient has than the FeCrAl textile porous materials surface of improving 0.2 ~ 0.4 before immersion the featheriness thrust that hill height is the cluster of 2 μm ~ 5 μm, and the thickness of the featheriness thrust of described cluster is not more than 100nm.
The present invention compared with prior art has the following advantages:
1, preparation method of the present invention is simple, by adjustment preparation technology, can control the specific features of fiber surface microtexture.
2, the present invention starts with from change fiber surface microtexture, NaOH is adopted to corrode FeCrAl textile porous materials, the featheriness thrust structure of cluster is obtained at fiber surface, effectively can improve the sound absorption coefficient in FeCrAl textile porous materials whole frequency range, and not test sample thin and thick restriction, expands the range of application of FeCrAl textile porous materials.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing illustrates:
Fig. 1 is the sound absorption coefficient-frequency of sound wave figure of the FeCrAl textile porous materials after the embodiment of the present invention 1 processes.
Fig. 2 is the SEM figure on the FeCrAl textile porous materials surface after the embodiment of the present invention 1 processes.
Fig. 3 is the sound absorption coefficient-frequency of sound wave figure of the FeCrAl textile porous materials after the embodiment of the present invention 2 processes.
Fig. 4 is the SEM figure on the FeCrAl textile porous materials surface after the embodiment of the present invention 2 processes.
Fig. 5 is the SEM figure on the FeCrAl textile porous materials surface after the embodiment of the present invention 3 processes.
Embodiment
Embodiment 1
Be Φ 6 μm by fiber string diameter, porosity is 95%, thickness is that the FeCrAl textile porous materials of 30mm cleans up, then being placed in concentration is that the NaOH aqueous solution of 1.0mol/L soaks 1h, cleaning, drying after taking out, obtain the sound absorption coefficient when 4000Hz and improved 0.3 before soaking, it is 2 μm ~ 5 μm that surface has thickness, and width is not more than the FeCrAl textile porous materials of the featheriness thrust of the cluster of 100nm.
Testing sound absorption performance and sem analysis are carried out to the FeCrAl textile porous materials after the present embodiment process.The sound absorption coefficient of sample generally improves as can be seen from Fig. 1, improves 0.3 when 4000Hz.Figure 2 shows that the microscopic appearance of fiber surface, there is the featheriness thrust structure of typical cluster.
Embodiment 2
It is 20 μm by fiber string diameter, porosity is 85%, thickness is that the FeCrAl textile porous materials of 10mm cleans up, then being placed in concentration is that the NaOH aqueous solution of 0.5mol/L soaks 5h, cleaning, drying after taking out, obtain the sound absorption coefficient when 1000Hz and improved 0.4 before soaking, it is 2 μm ~ 5 μm that surface has thickness, and width is not more than the FeCrAl textile porous materials of the featheriness thrust of the cluster of 100nm.
Testing sound absorption performance and sem analysis are carried out to the FeCrAl textile porous materials after the present embodiment process.The sound absorption coefficient of sample generally improves as can be seen from Fig. 3, improves 0.4 when 1000Hz.Figure 4 shows that the microscopic appearance of fiber surface, there is the featheriness thrust structure of typical cluster.
Embodiment 3
Be Φ 40 μm by fiber string diameter, porosity is 80%, thickness is that the FeCrAl textile porous materials of 3mm cleans up, then being placed in concentration is that the NaOH aqueous solution of 0.1mol/L soaks 10h, cleaning, drying after taking out, obtain the sound absorption coefficient when 1000Hz and improved 0.2 before soaking, it is 2 μm ~ 5 μm that surface has thickness, and width is not more than the FeCrAl textile porous materials of the featheriness thrust of the cluster of 100nm.
Sem analysis is carried out to the FeCrAl textile porous materials after the present embodiment process.Figure 5 shows that the microscopic appearance of fiber surface, there is the featheriness thrust structure of typical cluster.
The above; it is only preferred embodiment of the present invention; not any restriction is done to the present invention, every above embodiment is done according to invention technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.
Claims (4)
1. one kind is improved the method for FeCrAl textile porous materials sound absorption coefficient, it is characterized in that, the method is: the FeCrAl textile porous materials cleaned up being placed in concentration is that the NaOH aqueous solution of 0.1mol/L ~ 1.0mol/L soaks 1h ~ 10h, cleaning, drying after taking out, obtains sound absorption coefficient than the FeCrAl textile porous materials improving 0.2 ~ 0.4 before immersion; The fiber string diameter of the described FeCrAl textile porous materials cleaned up is Φ 6 μm ~ Φ 40 μm, and porosity is 80% ~ 95%.
2. a kind of method improving FeCrAl textile porous materials sound absorption coefficient according to claim 1, is characterized in that, described in the thickness of FeCrAl textile porous materials that cleans up be 3mm ~ 30mm.
3. a kind of method improving FeCrAl textile porous materials sound absorption coefficient according to claim 1, is characterized in that, the concentration of the described NaOH aqueous solution is 0.5mol/L, and the time of described immersion is 5h.
4. a kind of method improving FeCrAl textile porous materials sound absorption coefficient according to claim 1, it is characterized in that, described sound absorption coefficient has than the FeCrAl textile porous materials surface of improving 0.2 ~ 0.4 before immersion the featheriness thrust that hill height is the cluster of 2 μm ~ 5 μm, and the thickness of the featheriness thrust of described cluster is not more than 100nm.
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| CN104630635B (en) * | 2015-03-05 | 2016-08-24 | 北京绿洁美科技有限公司 | A kind of ferrum-chromium-aluminum base porous metal material and preparation method thereof |
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| JPS61183186A (en) * | 1985-04-10 | 1986-08-15 | 三菱電機株式会社 | Sound absorber for internal combustion engine |
| SE0000002L (en) * | 2000-01-01 | 2000-12-11 | Sandvik Ab | Process for manufacturing a FeCrAl material and such a mortar |
| KR20100035727A (en) * | 2008-09-29 | 2010-04-07 | 서울대학교산학협력단 | Fecral alloy for fuel cladding and structural materials of pb or pb-bi alloy cooled fast reactor |
| CN102059123B (en) * | 2010-12-12 | 2012-07-25 | 西北有色金属研究院 | Sintering FeCrAl metal fiber porous carrier catalyst and preparation method thereof |
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