(1) Izici ze-brazing i-aluminium matrix composites zifaka phakathi ukuqinisa izinhlayiya (kufaka phakathi i-whisker) kanye nokuqinisa ifayibha. Izinto ezisetshenziselwa ukuqinisa zifaka phakathi i-B, i-CB, i-SiC, njll.
Uma izinhlanganisela ze-aluminium matrix ziqiniswa futhi zishiswa, i-matrix Al kulula ukusabela ngayo ngesigaba sokuqinisa, njengokusabalala okusheshayo kwe-Si ensimbini yokugcwalisa kuya ensimbini eyisisekelo kanye nokwakheka kwesendlalelo sokulahla imfucuza esibuthakathaka. Ngenxa yomehluko omkhulu ku-coefficient yokwandisa eqondile phakathi kwe-Al nesigaba sokuqinisa, ukushisa okungafanele kwe-brazing kuzobangela ukucindezeleka kokushisa endaweni ehlanganayo, okulula ukubangela ukuqhekeka kwamalunga. Ngaphezu kwalokho, ukumanzi phakathi kwensimbi yokugcwalisa kanye nesigaba sokuqinisa kubi, ngakho-ke indawo yokuqinisa ye-composite kumele iphathwe noma kusetshenziswe insimbi yokugcwalisa esebenzayo, futhi i-vacuum brazing kufanele isetshenziswe ngangokunokwenzeka.
(2) Izinto zokubumba kanye nenqubo ye-B noma i-SiC particle reinforced aluminium matrix composites zingabumba, futhi ukwelashwa kwendawo ngaphambi kokubumba kungenziwa ngokugaya i-sandpaper, ukuhlanza ibhulashi lensimbi, ukuwasha nge-alkali noma i-electroless nickel plating (ubukhulu be-coating bungu-0.05mm). Insimbi yokugcwalisa yi-s-cd95ag, s-zn95al kanye ne-s-cd83zn, ezishiswa ilangabi elithambile le-oxyacetylene. Ngaphezu kwalokho, amandla aphezulu amalunga angatholakala ngokuklwebha i-brazing nge-s-zn95al solder.
I-vacuum brazing ingasetshenziswa ekuxhumeni ama-composites e-aluminium matrix e-Short Fiber Reinforced 6061. Ngaphambi kokubhidliza, ubuso kufanele bugaywe ngephepha eli-abrasive elingu-800 ngemva kokugaywa, bese libhidlizwa esithandweni ngemva kokuhlanzwa kwe-ultrasonic nge-acetone. Insimbi yokubhidliza i-Al Si isetshenziswa kakhulu. Ukuze kuvinjelwe ukusabalala kwe-Si ensimbini eyisisekelo, ungqimba lwesendlalelo sesithintelo se-aluminium foil emsulwa lungagqokwa ebusweni be-brazing bezinto ezihlanganisiwe, noma insimbi yokubhidliza i-b-al64simgbi (11.65i-15mg-0.5bi) enamandla aphansi okubhidliza ingakhethwa. Ububanzi bokushisa bokuncibilika kwensimbi yokubhidliza i-brazing bungu-554 ~ 572 ℃, izinga lokushisa lokubhidliza lingaba ngu-580 ~ 590 ℃, isikhathi sokubhidliza singamaminithi angu-5, kanti amandla okushefa ejoyintini makhulu kuno-80mpa.
Kuma-graphite particle reinforced aluminium matrix composites, i-brazing esithandweni somoya esivikelayo iyindlela ephumelela kakhulu okwamanje. Ukuze kuthuthukiswe ukumanzi, i-Al Si solder equkethe i-Mg kumele isetshenziswe.
Njengoba kunjalo nge-aluminium vacuum brazing, ukumanzisa kwe-aluminium matrix composites kungathuthukiswa kakhulu ngokungenisa i-mg vapor noma i-Ti suction kanye nokwengeza inani elithile le-Mg.
Isikhathi sokuthunyelwe: Juni-13-2022