(1) Njiri mara mma nsogbu ndị dị na graphite na diamond polycrystalline brazing yiri nke ahụ zutere na brazing seramiiki.E jiri ya tụnyere ígwè, solder siri ike ime ka ihe graphite na diamond polycrystalline dị mmiri, yana ọnụ ọgụgụ ya nke mgbasawanye thermal dị nnọọ iche na nke ihe nhazi n'ozuzu ya.Ha abụọ na-ekpo ọkụ ozugbo na ikuku, na oxidation ma ọ bụ carbonization ga-eme mgbe okpomọkụ karịrị 400 ℃.Ya mere, a ga-anakwere vacuum brazing, na ohere agụụ agaghị abụ ihe na-erughị 10-1pa.N'ihi na ike nke abụọ adịghị elu, ọ bụrụ na enwere nrụgide okpomọkụ n'oge brazing, mgbawa nwere ike ime.Gbalịa họrọ metal brazing filler nwere ọnụ ọgụgụ dị ala nke mgbasawanye ọkụ ma jikwaa ọnụego jụrụ oyi.Ebe ọ bụ na elu nke ihe ndị dị otú ahụ adịghị mfe wetted site nkịtị brazing filler ọla, a oyi akwa nke 2.5 ~ 12.5um oké W, Mo na ihe ndị ọzọ nwere ike idobe n'elu graphite na diamond polycrystalline ihe site na mgbanwe elu (mkpuchi mkpuchi). , ion sputtering, plasma spraying na ụzọ ndị ọzọ) tupu brazing na-etolite kwekọrọ ekwekọ carbides na ha, ma ọ bụ elu ọrụ brazing filler ọla nwere ike iji.
Graphite na diamond nwere ọtụtụ akara ule, nke dị iche na nha nha, njupụta, ịdị ọcha na akụkụ ndị ọzọ, ma nwee njirimara brazing dị iche iche.Na mgbakwunye, ọ bụrụ na okpomọkụ nke polycrystalline diamond ihe karịrị 1000 ℃, polycrystalline wear ratio na-amalite ibelata, na wear ratio na-ebelata ihe karịrị 50% mgbe okpomọkụ gafere 1200 ℃.Ya mere, mgbe vacuum brazing diamond, brazing okpomọkụ a ga-achịkwa n'okpuru 1200 ℃, na agụụ agaghị erughị 5 × 10-2Pa.
(2) Nhọrọ nke brazing filler metal na-adabere na ojiji na nhazi elu.Mgbe ejiri ya mee ihe dị ka ihe na-eguzogide okpomọkụ, a ga-ahọrọ brazing filler metal na nnukwu brazing okpomọkụ na ezigbo okpomọkụ na-eguzogide;Maka ihe na-egbochi corrosion kemịkalụ, a na-ahọrọ ọla brazing filler nwere obere okpomọkụ brazing na ezigbo nguzogide corrosion.N'ihi na graphite mgbe elu metallization ọgwụgwọ, dị ọcha ọla kọpa solder na elu ductility na ezi corrosion iguzogide ike ga-eji.Silver dabeere na ọla kọpa na-arụ ọrụ solder nwere ezigbo wettability na fluidity na graphite na diamond, ma ọrụ okpomọkụ nke brazed nkwonkwo siri ike gafere 400 ℃.Maka akụrụngwa graphite na ngwaọrụ diamond ejiri n'etiti 400 ℃ na 800 ℃, ntọala ọla edo, palladium base, manganese base ma ọ bụ titanium base filler ọla na-ejikarị.Maka nkwonkwo eji n'etiti 800 ℃ na 1000 ℃, nickel dabeere ma ọ bụ mkpọpu dabeere metal filler ga-eji.Mgbe a na-eji ihe ndị graphite n'elu 1000 ℃, enwere ike iji metal filler metal (Ni, PD, Ti) ma ọ bụ alloy filler nwere molybdenum, Mo, Ta na ihe ndị ọzọ nwere ike ịmepụta carbide na carbon.
Maka graphite ma ọ bụ diamond na-enweghị ọgwụgwọ elu, enwere ike iji ọla ndị na-arụ ọrụ na tebụl 16 mee brazing ozugbo.Ọtụtụ n'ime ọla ndị a na-ejuputa bụ titanium dabeere ọnụọgụ abụọ ma ọ bụ ternary alloys.Titanium dị ọcha na-emeghachi omume ike na graphite, nke nwere ike ịmepụta akwa carbide dị oke egwu, yana ọnụọgụ mgbasawanye ya dị iche na nke graphite, nke dị mfe imepụta mgbape, yabụ enweghị ike iji ya dị ka ihe na-ere ahịa.Mgbakwunye nke Cr na Ni na Ti nwere ike ibelata ebe mgbaze ma melite wettability na ceramik.Ti bụ ternary alloy, tumadi mejupụtara Ti Zr, na mgbakwunye na nke TA, Nb na ndị ọzọ ọcha.Ọ nwere ọnụọgụ dị ala nke mgbasawanye linear, nke nwere ike ibelata nrụgide brazing.The ternary alloy tumadi mejupụtara Ti Cu dabara maka brazing nke graphite na ígwè, na nkwonkwo nwere nnukwu corrosion eguzogide.
Tebụl 16 brazing filler ọla maka brazing ozugbo nke graphite na diamond
(3) Usoro brazing usoro brazing nke graphite nwere ike kewaa ụzọ abụọ, otu bụ brazing mgbe emechara elu elu, nke ọzọ bụ brazing na-enweghị ọgwụgwọ elu.N'agbanyeghị usoro a na-eji, a ga-edozi welded tupu mgbakọ ahụ, a ga-ehichapụkwa ihe ndị na-emerụ emerụ nke ihe graphite na mmanya ma ọ bụ acetone.N'ihe gbasara metallization brazing, a ga-etinye oyi akwa Ni, Cu ma ọ bụ oyi akwa Ti, Zr ma ọ bụ molybdenum disilicide n'elu graphite site na spraying plasma, mgbe ahụ, a ga-eji ọla kọpa ma ọ bụ igwe na-ejuputa ọla kọpa mee ihe maka brazing. .Ịme brazing ozugbo na ihe na-ere ihe na-arụ ọrụ bụ usoro a na-ejikarị eme ihe ugbu a.Enwere ike ịhọrọ okpomọkụ nke brazing dị ka onye na-ere ahịa nyere na tebụl 16. Enwere ike ịkụnye ihe na-ere ahịa n'etiti etiti nkwonkwo brazed ma ọ bụ nso otu njedebe.Mgbe ị na-eji ígwè na-eme brazing na nnukwu ọnụọgụ nke mgbasawanye ọkụ, Mo ma ọ bụ Ti nwere ụfọdụ ọkpụrụkpụ nwere ike iji dị ka oyi akwa mkpuchi etiti.Ntugharị mgbanwe nwere ike ịmepụta nrụrụ plastik n'oge ikpo ọkụ brazing, na-etinye nrụgide okpomọkụ ma zere mgbawa graphite.Dịka ọmụmaatụ, a na-eji Mo dị ka nkwonkwo ntugharị maka ikuku brazing nke graphite na ngwa hastelloyn.B-pd60ni35cr5 solder nwere ezigbo iguzogide corrosion nnu gbazere na radieshon na-eji.Okpomọkụ brazing bụ 1260 ℃ ma debe okpomọkụ maka 10min.
Enwere ike iji b-ag68.8cu16.7ti4.5, b-ag66cu26ti8 na ndị na-ere ahịa na-arụsi ọrụ ike.A ga-eme brazing n'okpuru oghere ma ọ bụ nchebe argon dị ala.Okpomọkụ brazing ekwesịghị gafere 850 ℃, na a ga-ahọrọ ọkụ ọkụ ngwa ngwa.Oge njide na okpomoku brazing ekwesịghị ịdị ogologo (n'ozuzu ihe dịka 10s) iji zere ịmepụta oyi akwa tic na-aga n'ihu na interface.Mgbe brazing diamond na alloy steel, plastic interlayer ma ọ bụ obere mgbasa alloy oyi akwa kwesịrị ịgbakwunye maka mgbanwe iji gbochie mmebi nke diamond ọka nke oke okpomọkụ na-akpata.A na-emepụta ngwá ọrụ ntụgharị ma ọ bụ ngwá ọrụ na-agwụ ike maka nhazi nke ọma site na usoro brazing, nke na-ekpuchi 20 ~ 100mg obere diamond n'elu ahụ nchara, na nkwonkwo ike nke nkwonkwo brazing ruru 200 ~ 250mpa.
Enwere ike ịgbaze diamond polycrystalline site na ire ọkụ, ugboro dị elu ma ọ bụ oghere.A ga-anakwere brazing dị elu ma ọ bụ brazing ọkụ maka okirikiri diamond okirikiri ịcha ọla ma ọ bụ nkume.Ag Cu Ti na-arụ ọrụ brazing filler metal nwere ebe mgbaze dị ala ka a ga-ahọrọ.A ga-achịkwa okpomoku brazing n'okpuru 850 ℃, oge kpo oku agaghị adị ogologo oge, a ga-anabatakwa ngwa ngwa jụrụ oyi.Ngwunye diamond polycrystalline eji na mmanụ ala na mkpọ ala nwere ọnọdụ ọrụ adịghị mma ma na-ebu nnukwu mmetụta.Enwere ike ịhọrọ metal brazing nke dabere na nickel yana enwere ike iji foil ọla kọpa dị ọcha dị ka interlayer maka oghere brazing.Ọmụmaatụ, 350 ~ 400 capsules Ф 4.5 ~ 4.5mm columnar polycrystalline diamond na-brazed n'ime perforations nke 35CrMo ma ọ bụ 40CrNiMo ígwè na-etolite ịkpụ ezé.A na-anakwere Vacuum brazing, na ogo agụụ abụghị ihe na-erughị 5 × 10-2Pa, brazing okpomọkụ bụ 1020 ± 5 ℃, oge njide bụ 20 ± 2min, na ike shiee nke nkwonkwo brazing karịrị 200mpa.
N'oge brazing, a ga-eji ịdị arọ nke onwe nke weldment mee ihe maka mgbakọ na nhazi dị ka o kwere mee iji mee ka akụkụ ígwè pịa graphite ma ọ bụ ihe polycrystalline dị n'elu.Mgbe ị na-eji ihe nrụnye maka nhazi, ihe nkwụnye ahụ ga-abụ ihe na-eme ka ọ bụrụ ihe na-eme ka ọ bụrụ ihe na-eme ka okpomọkụ dị ka nke weldment.
Oge nzipu: Jun-13-2022