Kuwotcha kwa Aluminium Matrix Composites

(1) Makhalidwe a brazing ma aluminium matrix composites makamaka amaphatikiza tinthu (kuphatikiza ndevu) kulimbitsa ndi kulimbitsa ulusi.Zida zomwe zimagwiritsidwa ntchito kulimbikitsa makamaka B, CB, SiC, etc.

Pamene ma aluminium matrix composites akuwotchedwa ndikuwotchedwa, matrix Al ndi osavuta kuchitapo ndi gawo lolimbikitsa, monga kufalikira kwa Si muzitsulo zodzaza ndi zitsulo zoyambira ndikupanga wosanjikiza wotayirira.Chifukwa cha kusiyana kwakukulu kwa mzere wowonjezera wowonjezera pakati pa Al ndi gawo lolimbikitsa, kutentha kosayenera kumayambitsa kupsinjika kwa kutentha pamawonekedwe, omwe ndi osavuta kuyambitsa kusweka.Kuphatikiza apo, kunyowa pakati pa zitsulo zodzaza ndi zitsulo zolimbitsa thupi ndizosauka, chifukwa chake nsonga yamadzi yophatikizika iyenera kuthandizidwa kapena zitsulo zolumikizidwa ziyenera kugwiritsidwa ntchito, ndipo kupukuta kwa vacuum kuyenera kugwiritsidwa ntchito momwe mungathere.

(2) Brazing zakuthupi ndi ndondomeko B kapena SiC tinthu analimbitsa zotayidwa masanjidwewo nsanganizo akhoza brazed, ndi pamwamba mankhwala pamaso kuwotcherera zikhoza kuchitika ndi sandpaper akupera, waya burashi kuyeretsa, kutsuka alkali kapena electroless faifi tambala plating (❖ kuyanika makulidwe 0.05mm).Chitsulo chodzaza ndi s-cd95ag, s-zn95al ndi s-cd83zn, chomwe chimatenthedwa ndi lawi lofewa la oxyacetylene.Kuphatikiza apo, nyonga yayikulu yolumikizana imatha kupezeka pokanda brazing ndi s-zn95al solder.

Vacuum brazing ingagwiritsidwe ntchito polumikiza ma composites a Short Fiber Reinforced 6061 aluminium matrix.Pamaso brazing, pamwamba adzakhala pansi ndi 800 abrasive pepala pambuyo akupera, ndiyeno brazed mu ng'anjo pambuyo akupanga kuyeretsa mu acetone.Al Si brazing filler zitsulo zimagwiritsidwa ntchito makamaka.Pofuna kupewa kufalikira kwa Si muzitsulo zoyambira, wosanjikiza wa aluminiyamu wotchinga chotchinga chotchinga amatha kuphimbidwa pamwamba pa zinthu zophatikizika, kapena b-al64simgbi (11.65i-15mg-0.5bi) chitsulo chosungunula chodzaza kutsika mphamvu brazing akhoza kusankhidwa.Kutentha kosungunuka kwazitsulo zodzaza ndi 554 ~ 572 ℃, kutentha kwachitsulo kumatha kukhala 580 ~ 590 ℃, nthawi yowotcha ndi 5min, ndipo kumeta ubweya wa mphamvu yolumikizana ndi yayikulu kuposa 80mpa.

Kwa ma graphite tinthu tolimbitsa ma aluminium matrix kompositi, kuwotcha mu ng'anjo yoteteza mpweya ndiyo njira yopambana kwambiri pakadali pano.Pofuna kukonza kunyowa, Al Si solder yokhala ndi Mg iyenera kugwiritsidwa ntchito.

Monga momwe zimakhalira ndi aluminiyamu vacuum brazing, kunyowa kwa ma aluminium matrix composites kumatha kuwongolera bwino poyambitsa mg vapor kapena kuyamwa kwa Ti ndikuwonjezera kuchuluka kwa Mg.