Aluminium alloy, uas yog tsim los ntawm kev ntxiv qee cov hlau lossis cov hlau tsis yog hlau rau cov ntshiab txhuas, yog ib hom tshiab ntawm cov khoom siv hlau. Vim nws qhov tshwj xeeb me me, lub zog tshwj xeeb thiab kev ua haujlwm zoo, nws tau siv dav hauv kev lag luam aviation thiab kev tsim tsheb. Kev lag luam, cov cuab yeej hluav taws xob, cov cuab yeej thiab cov khoom siv hauv pej xeem thiab lwm yam. Nrog rau txoj kev loj hlob ntawm lub teb chaws kev lag luam thiab kev nce qib ntawm cov txheej txheem ntawm kev lag luam kev koom ua ke, nws cov khoom tsim thiab kev siv tau zoo heev tshaj li cov hlau. Txhim khu kev tshawb fawb ntawm cov khoom ntawm aluminium alloy cov ntaub ntawv thiab ua kom ntseeg tau zoo ntawm aluminium alloy castings tsis yog tsuas yog lub luag haujlwm tseem ceeb ntawm peb txhua tus neeg ua haujlwm tshawb fawb thiab thev naus laus zis, tab sis kuj yog qhov tseem ceeb tshaj plaws uas cuam tshuam nrog peb lub neej niaj hnub. Ua ke nrog tus sau cov kev paub dhau los hauv kev tsim cov aluminium alloy castings, tsab xov xwm no tham txog cov teeb meem ntawm qhov pores thiab kev tiv thaiv ntawm aluminium alloy castings.
Hom stomata
Vim tias aluminium alloy muaj qhov hnyav rau oxidize thiab nqus pa, thiab nws yog nyob rau hauv kev sib cuag ncaj qha nrog lub cub tawg roj los yog cov cua sab nraud thaum lub sij hawm smelting txheej txheem, yog hais tias tus tswj tsis tau zoo thaum lub sij hawm smelting txheej txheem, aluminium alloy tau yooj yim nqus pa roj. thiab tsim pores. Qhov ntau tshaj plaws yog pinhole. Pinhole (gas porosity / pin-qhov), feem ntau yog hais txog nag lossis daus pores tsawg dua 1 hli hauv qhov casting, uas feem ntau yog ncig thiab tsis sib npaug ntawm tag nrho cov seem ntawm cov casting, tshwj xeeb tshaj yog nyob rau hauv tuab thiab loj seem ntawm casting thiab cov txias tus nqi yog me me. ib feem. Raws li kev faib tawm thiab cov yam ntxwv ntawm aluminium alloy nag lossis daus pores, pinholes tuaj yeem muab faib ua peb pawg ①, uas yog:
(1) Dot-shaped pinholes: Nyob rau hauv cov ntaub so ntswg uas tsis tshua muaj zog, cov pinholes nyob rau hauv cov duab ntawm cov dots, thiab cov qauv ntawm cov pinholes yog qhov tseeb thiab tsis txuas ntxiv. Tus naj npawb ntawm pinholes ib square centimeter tuaj yeem suav tau thiab lawv txoj kab uas hla tuaj yeem ntsuas tau. Xws li pinholes tau yooj yim txawv ntawm cov kab noj hniav shrinkage thiab shrinkage porosity.
(2) Mesh pinholes: Nyob rau hauv cov ntaub so ntswg uas tsis tshua muaj magnification, cov pinholes yog densely txuas mus rau lub network, thiab muaj ob peb qhov loj. Nws tsis yooj yim los xyuas cov naj npawb ntawm cov pinholes hauv ib cheeb tsam, thiab nws yog qhov nyuaj rau kev ntsuas lub cheeb ntawm pinholes.
(3) Comprehensive stomata: Nws yog ib qho nruab nrab ntawm qhov taw tes pinholes thiab mesh pinholes. Los ntawm qhov kev xav ntawm qhov tsis tshua muaj magnification, muaj ntau lub pinholes loj, tab sis lawv tsis yog dot-puab, tab sis polygonal.
Kev coj ua ntawm aluminium alloy ntau lawm tau ua pov thawj tias cov roj tseem ceeb ntawm cov pores tsim los ntawm aluminium alloy vim nqus pa yog hydrogen, thiab tsis muaj qee txoj cai ua raws. Tsis muaj kev zam, aluminium alloys ntawm ntau yam kev sib xyaw yog nquag rau pinholes.