(1) Iimpawu zeBrazing i-aluminium matrix composites ikakhulu ibandakanya i-particle (kubandakanywa ne-whisker) ukuqinisa kunye nokuqinisa i-fiber.Izinto ezisetyenziselwa ukuqinisa ikakhulu ziquka i-B, i-CB, i-SiC, njl.
Xa i-aluminiyam i-matrix composites i-brazed kwaye ishushu, i-matrix Al kulula ukusabela kunye nesigaba sokuqinisa, njengokusasazwa ngokukhawuleza kwe-Si kwintsimbi yokuzalisa kwisiseko sesinyithi kunye nokwakhiwa kwe-brittle dumping layer.Ngenxa yomahluko omkhulu kwi-coefficient yokwandiswa komgca phakathi kwe-Al kunye nesigaba sokuqinisa, ukufudumeza okungafanelekanga kokutshisa kuya kubangela uxinzelelo lwe-thermal kwi-interface, ekulula ukubangela ukuqhekeka ngokubambisana.Ukongezelela, ukumanzisa phakathi kwesinyithi sokuzalisa kunye nesigaba sokuqinisa sihluphekile, ngoko ke indawo yokugubungela i-composite kufuneka iphathwe okanye isebenze isinyithi sokuzalisa kufuneka sisetyenziswe, kwaye i-vacuum brazing kufuneka isetyenziswe ngokusemandleni.
(2) Izinto zokutshisa kunye nenkqubo ye-B okanye i-SiC i-particle eyomeleziweyo ye-aluminiyam i-matrix composites inokugqithwa, kwaye unyango olungaphezulu ngaphambi kwe-welding lunokwenziwa nge-sandpaper yokusila, ukucocwa kwebrashi yocingo, ukuhlamba i-alkali okanye i-nickel plating ye-electroless (ubukhulu be-coating 0.05mm).I-metal filler yi-s-cd95ag, s-zn95al kunye ne-s-cd83zn, ezifudunyezwa lilangatye elithambileyo le-oxyacetylene.Ukongezelela, amandla ahlangeneyo aphezulu angafunyanwa ngokukrazula i-brazing nge-s-zn95al solder.
I-vacuum brazing ingasetyenziselwa ukudibaniswa kweFiber emfutshane eQinisekisiweyo ye-6061 i-aluminium matrix composites.Ngaphambi kokugcoba, umphezulu uya kugatywa ngephepha le-800 le-abrasive emva kokugaya, kwaye emva koko ugxininise kwisithando somlilo emva kokucoca i-ultrasonic kwi-acetone.I-Al Si brazing metal filler isetyenziswa kakhulu.Ukuze kuthintelwe ukusasazwa kwe-Si kwisiseko sesinyithi, umaleko we-aluminium ecocekileyo ye-foil barrier layer inokugqunywa kwindawo yokuqhafaza yezinto ezidibeneyo, okanye i-b-al64simgbi (11.65i-15mg-0.5bi) i-brazing filler metal with amandla aphantsi okubrawuza anokukhethwa.Uluhlu lweqondo lokushisa lokunyibilika kwensimbi yokufaka i-brazing yi-554 ~ 572 ℃, ubushushu bokushisa bunokuba ngu-580 ~ 590 ℃, ixesha lokuqhawula yi-5min, kwaye amandla okucheba komdibaniso mkhulu kune-80mpa.
Kwi-particle yegraphite eyomeleziweyo ye-aluminiyam ye-matrix composites, ukubhobhoza kwisithando somlilo sokukhusela yeyona ndlela iphumelele kakhulu ngoku.Ukuze kuphuculwe ukumanzi, i-Al Si solder ene-Mg kufuneka isetyenziswe.
Njengakwi-aluminiyam vacuum brazing, ukumanzisa kwe-aluminium matrix composite kunokuphuculwa kakhulu ngokuzisa umphunga we-mg okanye i-Ti suction kunye nokongeza inani elithile le-Mg.
Ixesha lokuposa: Jun-13-2022