Ka hoʻopili ʻana i nā metala hana

1. Mea hoʻoheheʻe

(1) ʻAʻole pinepine ʻia ka Titanium a me kāna mau mea hoʻohuihui kumu me ka solder palupalu. ʻO nā metala hoʻopihapiha brazing i hoʻohana ʻia no ka brazing e komo pū me ke kumu kālā, ke kumu alumini, ke kumu titanium a i ʻole ke kumu titanium zirconium.

Hoʻohana nui ʻia ka solder kālā no nā ʻāpana me ka mahana hana ma lalo o 540 ℃. ʻO nā hui e hoʻohana ana i ka solder kālā maʻemaʻe he haʻahaʻa ka ikaika, maʻalahi ke haki, a ʻaʻole maikaʻi ke kūpaʻa i ka pala a me ke kūpaʻa oxidation. ʻOi aku ka haʻahaʻa o ka mahana brazing o ka solder Ag Cu ma mua o ke kālā, akā emi ka wettability me ka piʻi ʻana o ka ʻike Cu. Hiki i ka solder Ag Cu e loaʻa ana kahi liʻiliʻi o Li ke hoʻomaikaʻi i ka wettability a me ke kekelē alloying ma waena o ka solder a me ke metala kumu. Loaʻa i ka solder AG Li nā ʻano o ke kiko heheʻe haʻahaʻa a me ka reducibility ikaika. He kūpono ia no ka brazing titanium a me nā titanium alloys i ka lewa pale. Eia naʻe, e hoʻohaumia ka brazing vacuum i ka umu ma muli o ka evaporation Li. ʻO ka Ag-5al- (0.5 ~ 1.0) Mn filler metal ka metala hoʻopihapiha makemake ʻia no nā ʻāpana titanium alloy lahilahi. Loaʻa i ka hui brazed ka oxidation maikaʻi a me ke kūpaʻa corrosion. Hōʻike ʻia ka ikaika shear o nā hui titanium a me titanium alloy i brazed ʻia me ke metala hoʻopihapiha kumu kālā ma ka Papa 12.

Papa 12 nā palena hana brazing a me ka ikaika hui o ka titanium a me nā titanium alloys

He haʻahaʻa ka mahana hoʻoheheʻe ʻana o ka solder alumini, ʻaʻole ia e hoʻoulu i ka hanana o ka titanium alloy β Phase transformation e hōʻemi ana i nā koi no ke koho ʻana i nā mea hoʻopaʻa brazing a me nā hale. He haʻahaʻa ka pilina ma waena o ka metala hoʻopihapiha a me ke metala kumu, a ʻaʻole maopopo ka hoʻoheheʻe ʻana a me ka hoʻolaha ʻana, akā maikaʻi ka plasticity o ka metala hoʻopihapiha, a maʻalahi ke ʻōwili i ka metala hoʻopihapiha a me ke metala kumu, no laila kūpono loa ia no ka hoʻoheheʻe ʻana i ka radiator titanium alloy, ka hoʻonohonoho honeycomb a me ka hoʻonohonoho laminate.

ʻO ka maʻamau, loaʻa i nā fluxes i hoʻokumu ʻia i ka titanium a i ʻole titanium zirconium nā mea ʻē aʻe, hiki ke hoʻolaha koke i loko o ka matrix a pane me ka titanium i ka wā brazing, e hopena ana i ka pala o ka matrix a me ka hoʻokumu ʻana o kahi papa brittle. No laila, pono e hoʻomalu pono ʻia ka mahana brazing a me ka manawa paʻa i ka wā brazing, a ʻaʻole pono e hoʻohana ʻia no ka brazing o nā hale paia lahilahi e like me ka hiki. ʻO B-ti48zr48be kahi solder Ti Zr maʻamau. Loaʻa iā ia ka maʻalahi o ka pulu ʻana i ka titanium, a ʻaʻohe ʻano o ka metala kumu i ka ulu ʻana o ka palaoa i ka wā brazing.

(2) ʻO ka hoʻopili ʻana i nā metala hoʻopihapiha no ka zirconium a me nā hui kumu ʻO ka hoʻopili ʻana o ka zirconium a me nā hui kumu e pili nui ana i ka b-zr50ag50, b-zr76sn24, b-zr95be5, a me nā mea ʻē aʻe, kahi i hoʻohana nui ʻia i ka hoʻopili ʻana o nā paipu hui zirconium o nā mea hana mana nukelea.

(3) Hiki i ka titanium, zirconium a me nā hui kumu ke loaʻa nā hopena kūpono i ka lewa vacuum a me ka lewa inert (helium a me argon). Pono e hoʻohana ʻia ka argon maʻemaʻe kiʻekiʻe no ka brazing pale argon, a pono ke kiko hau -54 ℃ a i ʻole ka haʻahaʻa. Pono e hoʻohana ʻia ka flux kūikawā e loaʻa ana ka fluoride a me ka chloride o ka metala Na, K a me Li no ka brazing lapalapa.

2. ʻenehana hoʻopaʻa

Ma mua o ka hoʻoheheʻe ʻana, pono e hoʻomaʻemaʻe pono ʻia ka ʻili, hoʻohemo i ka ʻaila a wehe ʻia ka ʻili oxide. Pono e wehe ʻia ka ʻili oxide mānoanoa ma ke ʻano mechanical, ke ʻano one blasting a i ʻole ke ʻano ʻauʻau paʻakai heheʻe. Hiki ke hoʻopau ʻia ka ʻili oxide lahilahi i loko o ka hopena e loaʻa ana he 20% ~ 40% nitric acid a me 2% hydrofluoric acid.

ʻAʻole ʻae ʻia ʻo Ti, Zr a me kā lākou mau mea hoʻohuihui e hoʻopili i ka ʻili hui me ka ea i ka wā e hoʻomehana ai i ka brazing. Hiki ke hoʻokō ʻia ka brazing ma lalo o ka pale o ka vacuum a i ʻole ke kinoea inert. Hiki ke hoʻohana ʻia ka hoʻomehana induction alapine kiʻekiʻe a i ʻole ka hoʻomehana ʻana i ka pale. ʻO ka hoʻomehana induction ke ala maikaʻi loa no nā ʻāpana liʻiliʻi symmetrical, ʻoiai ʻoi aku ka maikaʻi o ka brazing i loko o ka umu no nā ʻāpana nui a paʻakikī.

Pono e koho ʻia ʻo Ni Cr, W, Mo, Ta a me nā mea ʻē aʻe e like me nā mea hoʻomehana no ka hoʻoheheʻe ʻana iā Ti, Zr a me kā lākou mau mea hoʻohuihui. ʻAʻole pono e hoʻohana ʻia nā lako me ka graphite i hōʻike ʻia ma ke ʻano he mau mea hoʻomehana e pale aku i ka haumia kalapona. Pono e hana ʻia ka mea hoʻopili paʻi me nā mea me ka ikaika wela kiʻekiʻe maikaʻi, ka coefficient hoʻonui wela like me Ti a i ʻole Zr, a me ka reactivity haʻahaʻa me ka metala kumu.