(1) Iimpawu zeBrazing aluminium matrix composites ziquka ikakhulu i-particle (kuquka i-whisker) reinforcement kunye ne-fiber reinforcement. Izixhobo ezisetyenziselwa ukuqinisa ziquka i-B, i-CB, i-SiC, njl.njl.
Xa ii-composites ze-aluminium matrix zifakwe ibrashi kwaye zifudunyezwa, i-matrix Al kulula ukuyisabela kwisigaba sokuqinisa, njengokusasazwa ngokukhawuleza kwe-Si kwisinyithi sokugcwalisa ukuya kwisinyithi esisisiseko kunye nokwenziwa komaleko we-brittle dumping. Ngenxa yomahluko omkhulu kwi-coefficient yokwandiswa komgca phakathi kwe-Al kunye nesigaba sokuqinisa, ukufudumeza okungafanelekanga kwebrashi kuya kubangela uxinzelelo lobushushu kwindawo yokuhlangana, okulula ukubangela ukuqhekeka kwamalungu. Ukongeza, ukumanzi phakathi kwesinyithi sokugcwalisa kunye nesigaba sokuqinisa akukuhle, ngoko ke umphezulu webrashi we-composite kufuneka uphathwe okanye kufuneka kusetyenziswe isinyithi sokugcwalisa, kwaye kufuneka kusetyenziswe i-vacuum brazing kangangoko kunokwenzeka.
(2) Izinto zokugquma kunye nenkqubo ye-B okanye i-SiC particle reinforced aluminium matrix composites zinokugquma, kwaye unyango lomphezulu ngaphambi kokugquma lungenziwa ngokugaya i-sandpaper, ukucoca ibrashi yocingo, ukuhlanjwa kwe-alkali okanye i-electroless nickel plating (ubukhulu be-coating yi-0.05mm). Isinyithi sokuzalisa yi-s-cd95ag, s-zn95al kunye ne-s-cd83zn, ezifudunyezwa lilangatye elithambileyo le-oxyacetylene. Ukongeza, amandla aphezulu ejoyinti anokufunyanwa ngokukrala i-brazing nge-s-zn95al solder.
I-vacuum brazing ingasetyenziselwa ukuqhagamshela ii-composites ze-aluminium matrix ze-Short Fiber Reinforced 6061. Ngaphambi kokugquma, umphezulu kufuneka ucolwe ngephepha elirhabaxa elingama-800 emva kokugaywa, uze ugqunywe esithandweni emva kokucocwa nge-ultrasonic kwi-acetone. I-Al Si brazing filler metal isetyenziswa kakhulu. Ukuze kuthintelwe ukusasazeka kwe-Si kwisinyithi esisisiseko, umaleko womaleko wesithintelo se-aluminium foil ecocekileyo unokugqunywa kumphezulu we-brazing wezinto ezidityanisiweyo, okanye i-b-al64simgbi (11.65i-15mg-0.5bi) brazing filler metal enamandla aphantsi okugquma ingakhethwa. Uluhlu lobushushu bokunyibilika kwesinyithi se-brazing filler yi-554 ~ 572 ℃, ubushushu be-brazing bungaba yi-580 ~ 590 ℃, ixesha lokugquma yi-5 min, kwaye amandla okucheba ejoyintini makhulu kune-80mpa.
Kwi-graphite particle reinforced aluminium matrix composites, i-brazing kwi-atmosphere furnace yeyona ndlela iphumeleleyo okwangoku. Ukuze kuphuculwe ukumanzi, kufuneka kusetyenziswe i-Al Si solder equlethe i-Mg.
Njengakwi-aluminium vacuum brazing, ukumanzika kwee-aluminium matrix composites kunokuphuculwa kakhulu ngokungenisa i-mg vapor okanye i-Ti suction kunye nokongeza ubungakanani obuthile be-Mg.
Ixesha lokuthumela: Juni-13-2022