Abstract
Open-celled aluminum foams with different pore sizes were fabricated. A plasma electrolytic oxidation (PEO) treatment was applied on the aluminum foams to create a layer of ceramic coating. The sound absorption coefficients of the foams were measured by an impedance tube and they were calculated by a transfer function method. The experimental results show that the sound absorption coefficient of the foam increases gradually with the decrease of pore size. Additionally, when the porosity of the foam increases, the sound absorption coefficient also increases. The PEO coating surface is rough and porous, which is beneficial for improvement in sound absorption. After PEO treatment, the maximum sound absorption of the foam is improved to some extent.
Highlights
Aluminum foams with open-cell structure have many outstanding physical and mechanical properties, such as low density, high damping properties, and excellent sound absorption [1,2]
The theoretical model revealed the correlation between sound absorption and morphological parameters such as pore size, pore opening, and porosity [4]
Wang found that the sound absorption behavior of open-celled aluminum foam was correlated with the pore size, sample thickness, and backing air gap depth
Summary
Aluminum foams with open-cell structure have many outstanding physical and mechanical properties, such as low density, high damping properties, and excellent sound absorption [1,2]. There are increasing studies on the sound absorption characteristics of the aluminum foams [4,5,6,7,8,9]. Li et al fabricated aluminum foams with spherical cells by an infiltration process They found sound absorption increases with an increase in the number of pore openings or with a decreased diameter of the pore openings [5]. Wang found that the sound absorption behavior of open-celled aluminum foam was correlated with the pore size, sample thickness, and backing air gap depth. 2tFh.4ai.gt3u.tFhEriegeffu8esrocestuho8nofdswPhaEosbOwtshosTretrphesteaoiotusmnoneupdnnetdaaokbansbionSsrcooprureptnaitodsioenAdncbcbusuyrorvrv~pe5est.si5ooo%nff ottahhffteetehrffeootaFahmomeasPsmwEwsOitihtthrPePEatEOmOternetrta.etamAtsmenmet.neIntt.tciIoatnncebadenafbboeouvnfeod,und that ttwhoe msFoiegucuhnraden8iasbsmhssowraprsetitrohenespspooenuasnkibdlieanbfcosroreratphsteeidosonbucynudr~va5eb.s5s%oorfptahtfietoenfrocathhmaersaPwcEtieOtrhistPtriEecsOatomtfrAeeanltftmo. aeAmntss.,mIit.eec.a,nntthiobeenveifsodcuoanubdsove, two tlmhosaestcethshareenssiusomlutnisndgaraferbosrmoersppthtoieonansiirpbfelleaokwfoiranncthrdeeathseeoduthnbedyrma~5ab.ls5lo%orspsaetfistoeonrrtichghienaParatEicnOtgetrfriresoatmitcmstehoneftf.ArAilcstfioomanmebnset,itowi.neee.e,dnthatehbeovvaiseirc, ous lossetawsndoremtshueelcthcinaenlgliswfmroaslmlatrhethrroeeusapgihorntflshiobewlevifabonrradtthiotehnseooutfhnaedirrambinasoltrhlpoetsipsoeonsrceohsra[irg4a–icn6te,a9rt]ii.sntIigtcscfaroonfmAbletfhofoaeumfnrsdi,cit.aeifo.,tnethrbetehvteiwscPeoEeuOns the air altnoredsasettmshereencstuetllhltiawntgathflrleortmhe ratorhueegsahmiratfhllloepwvoriabensrdaatttihomentichoreformmaieartleilnroslteshveeselopdroiigrsetinrsiab[tu4in–teg6d,f9ri]on.mtIhttehcesaunfrrfibcaetcieofnoufbntehtdwe aefelutnemrthitnehuaemirPEO treatafmonademntsth.etThhcaeetlsltehwsemarleal latlhrperoosruemgshaaldtlhdpeaovrteirbasrnaasttpiomonritcoprfaoatmhireoitfnetrhtheleesvopeulonrddeisswt[ra4iv–b6eu,9ate]n.ddItinccatrnheaebseseutfhrofeuanfcldeowoaffrteethsriesthtaelnucPmeEoOinf um foamttrhse.eatTsmohueennstedthswmataavtlhele.prTeohraerrseeasfomdrdea,llaipttorirasensosbapvtoimrotuicpsraottmhhaetoteftrhtleheevreosluodguihnstdrainbwduatepvdoerianonutdshecinosuacrtriefnaagcseewotfihltleheeflnoahlwaunmrceinsuitshmteance oiwtnofhttetihhrciftwtiwtteanohnoohoechhtaetrttteretsmiihhihiarcrcogsoeeaeahhisouhsncc.crrurerttntTiioaiainbsggoodamhiihdehsstnnebhetettpwswbsbsiweaaleteeetat.esabhsbhxttvewowmIviieeetettnue..eesfsa.c.fnIeoIeotleattlhnnuduTcTnccpentnhttaahwohhdbodenanereerfeaiewrwebrbcvaeasfieehaaiaonifearrovavnriifdlnnaeanreeeodden,fnfrglslee,rododetsairrethss.rirotdttstseeehIhrif..ddstaieetIIptsniththttsoppoihsihaeossboorpaaatebvfararlottotse,elivlrhtstosao,,nthhioomuennoopenesononudtaoddsttoostiotttiihototshressenetpunnppdaoddhllclltllyfyyaaaattttuthhhttccciiihhenreneanaateeemmmttthtt.tstththheeehrheoheeonneeneueruttfftnodfdrrdgooridiuoiiichcffsiscfgsttppwttitiphhhtoaolilhaaaolenennacvcenadaaeecffenobomabmefadporrsbmsencecooorsenendcrperropptetonbboriototuupnutrbiiffoosoctottuttirnnuaafhhotecllsteeopanpssahosoaeeaalceepstaabbottiokekhhantssahaoobeegttmmekrhristtnpphohiwfeimggltgtereoiitihhpororlwhilmtwmtgnnteibbheraorapipeelenmtllneelshaeaeabaiaepxtasxtkkettnltcncerrasshhaeihicanhhbbaetxakaciuitunncffnresttttthggieeehcehboeeadddedeifu,,nftttgeehedde, to thteo cthoemcpolmexpleefxfeecftfeocft ochf achnagnegoefotfhtehefofoaammsstrtruuccttuurree
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