1. Ihe e ji eme brazing
(1) Ígwè ihe eji eme brazing na carbide e ji simenti mee na-ejikarị ọla kọpa dị ọcha, zinc ọla kọpa na ọla kọpa ọlaọcha eme brazing. Ọla kọpa dị ọcha nwere ezigbo mmiri mmiri nye ụdị carbide niile e ji simenti mee, mana enwere ike inweta mmetụta kacha mma site na brazing na ikuku hydrogen na-ebelata. N'otu oge ahụ, n'ihi oke okpomọkụ brazing, nrụgide dị na nkwonkwo ahụ dị ukwuu, nke na-eduga na mmụba nke ọchịchọ mgbawa. Ike shear nke nkwonkwo e ji ọla kọpa dị ọcha mee dị ihe dị ka 150MPa, ike nkwonkwo ahụ dịkwa elu, mana ọ dabaraghị maka ọrụ okpomọkụ dị elu.
Ọla kọpa zinc bụ ígwè e ji eme ihe nke a na-ejikarị eme ihe maka ígwè e ji eme ihe na carbide e ji simenti mee. Iji mee ka mmiri nke ihe e ji eme ihe na ike nke njikọ ahụ dịkwuo mma, a na-agbakwụnyekarị Mn, Ni, Fe na ihe ndị ọzọ e ji eme ihe na ihe e ji eme ihe. Dịka ọmụmaatụ, a na-agbakwunye w (MN) 4% na b-cu58znmn iji mee ka ike nke ihe e ji eme ihe na carbide e ji simenti mee ruo 300 ~ 320MPa n'ọnọdụ okpomọkụ ụlọ; ọ ka nwere ike ịnọgide na-enwe 220 ~ 240mpa na 320 ℃. Ịtinye obere CO na ndabere nke b-cu58znmn nwere ike ime ka ike nke ihe e ji eme ihe na brazed ruo 350Mpa, ma nwee ike mmetụta dị elu na ike ọgwụgwụ, na-eme ka ndụ ọrụ nke ngwaọrụ e ji eme ihe na ngwaọrụ e ji eme ihe na nkume ka mma nke ukwuu.
Ebe mgbaze dị ala nke ígwè e ji ọla kọpa mee ka ọ gbazee na obere nrụgide okpomọkụ nke nkwonkwo e ji brazed mee bara uru iji belata ohere ịgbawa nke carbide e ji simenti mee n'oge brazing. Iji mee ka mmiri nke ihe e ji solder ahụ dịkwuo mma ma melite ike na okpomọkụ ọrụ nke nkwonkwo ahụ, a na-agbakwụnyekarị ihe Mn, Ni na ihe ndị ọzọ e ji alloy mee na solder ahụ. Dịka ọmụmaatụ, ihe e ji b-ag50cuzncdni mee nwere ezigbo ike mmiri na carbide e ji simenti mee, ihe e ji brazed ahụ mee nwekwara ezigbo ihe ndị zuru oke.
Na mgbakwunye na ụdị ọla brazing atọ dị n'elu, enwere ike ịhọrọ ọla brazing dabeere na Mn na Ni, dị ka b-mn50nicuccrco na b-ni75crsib, maka carbide simenti nke na-arụ ọrụ karịa 500 ℃ ma chọọ ike nkwonkwo dị elu. Maka brazing nke ígwè dị elu, a ga-ahọrọ ọla brazing pụrụ iche nke nwere okpomọkụ brazing kwekọrọ na okpomọkụ quenching. A na-ekewa ígwè a n'ime ụdị abụọ: otu bụ ígwè ferromanganese ụdị filler, nke mejupụtara ferromanganese na borax. Ike shear nke nkwonkwo brazed na-abụkarị ihe dị ka 100MPa, mana nkwonkwo ahụ na-enwekarị mgbawa; ụdị ọla kọpa pụrụ iche ọzọ nwere Ni, Fe, Mn na Si adịghị mfe ịmepụta mgbawa na nkwonkwo brazing, a pụkwara ịbawanye ike shear ya ruo 300mpa.
(2) Nhọrọ nke brazing flux na gas brazing flux ga-adaba na ígwè ntọala na ihe e ji eme ihe a ga-agbakọta. Mgbe a na-etinye ígwè na carbide simenti, brazing flux eji eme ihe bụkarị borax na boric acid, a na-agbakwụnyekwa ụfọdụ fluorides (KF, NaF, CaF2, wdg.) A na-eji Fb301, fb302 na fb105 fluxes maka copper zinc solder, a na-ejikwa fb101 ~ fb104 fluxes maka ọla kọpa ọlaọcha solder. A na-ejikarị Borax flux eme ihe mgbe a na-eji brazing pụrụ iche eme ihe iji brazing ígwè dị elu.
Iji gbochie oxidation nke ígwè ngwaọrụ n'oge a na-ekpo ọkụ brazing na iji zere nhicha mgbe brazing gasịrị, enwere ike iji brazing nke nwere ihe mkpuchi gas. Gas nchebe nwere ike ịbụ gas na-adịghị arụ ọrụ ma ọ bụ gas na-ebelata, ebe igirigi nke gas ga-adịkwa ala karịa -40 ℃ Enwere ike ịgba carbide simentị n'okpuru nchebe nke hydrogen, ebe igirigi nke hydrogen achọrọ ga-adị ala karịa -59 ℃.
2. Teknụzụ ịme brazing
A ghaghị ihicha ígwè ngwaọrụ ahụ tupu a na-eme brazing, elu igwe ekwesịghịkwa ịdị nro nke na ọ ga-eme ka mmiri na mgbasa nke ihe na brazing flux dị mfe. A ga-eji ájá gbazee elu carbide e ji simenti mee tupu a na-eme brazing, ma ọ bụ jiri silicon carbide ma ọ bụ wiilị diamond mee ka ọ dị mma iji wepụ carbon gabigara ókè n'elu ya, ka e wee jiri ígwè brazing mee ka ọ dị mmiri mmiri n'oge a na-eme brazing. Carbide e ji simenti mee nke nwere titanium carbide siri ike mmiri mmiri. A na-etinye copper oxide ma ọ bụ nickel oxide paste n'elu ya n'ụzọ ọhụrụ ma sie ya n'ime ikuku na-ebelata iji mee ka ọla kọpa ma ọ bụ nickel gbanwee n'elu ya, ka o wee mee ka mmiri sie ike nke solder siri ike.
Ọ kacha mma ka a na-eme brazing nke ígwè e ji ígwè rụọ tupu ma ọ bụ n'otu oge ahụ a na-eme breaking. Ọ bụrụ na a na-eme brazing tupu usoro breaking, okpomọkụ siri ike nke ígwè e ji eme ihe ga-adị elu karịa oke okpomọkụ breaking, nke mere na weldment ka nwere ike dị elu mgbe a na-ekpo ọkụ ọzọ ruo okpomọkụ breaking na-enweghị ọdịda. Mgbe a na-ejikọta brazing na quenching, a ga-ahọrọ ígwè e ji eme ihe nke nwere okpomọkụ siri ike nke dị nso na okpomọkụ quenching.
E ji ígwè arụ ọrụ nke alloy mee ihe dị iche iche. E kwesịrị ikpebi ígwè kwesịrị ekwesị maka ihe e ji eme brazing, usoro ọgwụgwọ okpomọkụ na teknụzụ nke ijikọta brazing na usoro ọgwụgwọ okpomọkụ dịka ụdị ígwè ahụ si dị, ka e wee nwee ike ịrụ ọrụ nkwonkwo nke ọma.
Okpomọkụ imechi ígwè dị elu na-adịkarị elu karịa okpomọkụ agbaze nke ọla kọpa ọlaọcha na ọla kọpa zinc solder, yabụ ọ dị mkpa imechi tupu imechi ya ma megharịa ya n'oge ma ọ bụ mgbe emechara imechi ya nke abụọ. Ọ bụrụ na achọrọ imechi ya mgbe emechara imechi ya, naanị ígwè imechi brazing pụrụ iche a kpọtụrụ aha n'elu ka enwere ike iji maka imechi ya. Mgbe ị na-eme ngwa ịkpụ ígwè dị elu, ọ dị mma iji coke oven. Mgbe agbazere ígwè e ji emechi ya, wepụ ngwaọrụ ịcha ya ma pịa ya ozugbo, wepụ ígwè e ji emechi brazing gabiga ókè, wee mee imechi mmanụ, wee mee ka ọ dị ọkụ na 550 ~ 570 ℃.
Mgbe a na-eji ígwè arụ mma ígwè, a ga-eji usoro nke ịbawanye oghere brazing na itinye gasket nkwụghachi ụgwọ plastik n'ime oghere brazing, a ga-ejikwa nwayọ nwayọ mee ka ọ dị jụụ mgbe a gbanyere ya iji belata nrụgide brazing, gbochie mgbawa ma mee ka ndụ ọrụ nke mgbakọ ngwaọrụ carbide simenti dị ogologo.
Mgbe ejiri eriri dụkọta ihe, a ga-eji mmiri ọkụ ma ọ bụ ngwakọta mwepụ ihe mkpofu sachaa ihe fọdụrụ n'ihe e ji agbakọta ihe, wee jiri mmiri ọkụ ma ọ bụ ihe e ji agbakọta ihe kwesịrị ekwesị tee ya iji wepụ ihe nkiri oxide dị na mkpanaka ngwaọrụ ntọala. Agbanyeghị, kpachara anya ka ị ghara iji nitric acid mee ihe iji gbochie ire ere nke ígwè njikọ brazing.
Oge ozi: Jun-13-2022