(1) Njirimara brazing nsogbu ndị dị na brazing graphite na diamond polycrystalline yiri nke a na-ahụ na brazing seramiiki. Ma e jiri ya tụnyere ígwè, solder siri ike ịgba mmiri graphite na diamond polycrystalline ihe, oke ya nke mgbasawanye okpomọkụ dị nnọọ iche na nke ihe owuwu izugbe. A na-ekpo ọkụ ha abụọ ozugbo n'ikuku, oxidation ma ọ bụ carbonization ga-eme mgbe okpomọkụ gafere 400 ℃. Ya mere, a ga-eji brazing vacuum mee brazing, ogo vacuum agaghịkwa erughị 10-1pa. N'ihi na ike nke ha abụọ adịghị elu, ọ bụrụ na enwere nrụgide okpomọkụ n'oge brazing, mgbawa nwere ike ime. Gbalịa ịhọrọ ígwè brazing na-ejupụta brazing nwere obere coefficient nke mgbasawanye okpomọkụ ma chịkwaa ọnụego oyi nke ọma. Ebe ọ bụ na elu ihe ndị dị otú ahụ adịghị mfe ịgba mmiri site na ọla ndị na-ejupụta ihe nkịtị, enwere ike itinye oyi akwa nke 2.5 ~ 12.5um nke W, Mo na ihe ndị ọzọ dị n'elu ihe polycrystalline graphite na diamond site na mgbanwe elu (mkpuchi vacuum, sputtering ion, plasma spraying na ụzọ ndị ọzọ) tupu brazing ma mepụta carbide kwekọrọ na ha, ma ọ bụ enwere ike iji ọla ndị na-ejupụta ihe dị elu.
Graphite na dayamọnd nwere ọtụtụ akara, nke dị iche na nha ihe dị iche iche, njupụta, ịdị ọcha na akụkụ ndị ọzọ, ma nwee njirimara brazing dị iche iche. Na mgbakwunye, ọ bụrụ na okpomọkụ nke ihe polycrystalline diamond karịrị 1000 ℃, oke wear polycrystalline na-amalite ibelata, oke wear na-ebelata site na ihe karịrị 50% mgbe okpomọkụ gafere 1200 ℃. Ya mere, mgbe a na-eji vacuum brazing diamond, a ga-achịkwa okpomọkụ brazing n'okpuru 1200 ℃, ogo vacuum agaghịkwa adị ala karịa 5 × 10-2Pa.
(2) Nhọrọ nke ihe eji eme brazing bụ isi dabere na ojiji na nhazi elu. Mgbe ejiri ya dị ka ihe na-eguzogide okpomọkụ, a ga-ahọrọ ígwè ihe eji eme brazing nwere oke okpomọkụ na ezigbo iguzogide okpomọkụ; Maka ihe ndị na-eguzogide nchara kemịkalụ, a na-ahọrọ ígwè ihe eji eme brazing nwere obere okpomọkụ na ezigbo iguzogide nchara. Maka ọgwụgwọ metallization elu graphite, enwere ike iji ihe eji eme copper dị ọcha nke nwere nnukwu ductility na ezigbo iguzogide nchara. Ihe eji eme ihe na-arụ ọrụ dabere na ọlaọcha na ọla kọpa nwere ezigbo mmiri mmiri na mmiri mmiri na graphite na diamond, mana okpomọkụ ọrụ nke ihe eji eme brazed siri ike ịgafe 400 ℃. Maka ihe mejupụtara graphite na ngwaọrụ diamond ejiri n'etiti 400 ℃ na 800 ℃, a na-ejikarị ntọala ọlaedo, ntọala palladium, ntọala manganese ma ọ bụ ígwè ihe eji eme titanium. Maka njikọ ejiri n'etiti 800 ℃ na 1000 ℃, a ga-eji ígwè ihe eji eme nickel ma ọ bụ nke eji eme drill. Mgbe ejiri ihe ndị mejupụtara graphite mee ihe karịa 1000 ℃, enwere ike iji ọla ndị na-ejupụta ígwè dị ọcha (Ni, PD, Ti) ma ọ bụ ọla ndị na-ejupụta alloy nwere molybdenum, Mo, Ta na ihe ndị ọzọ nwere ike ịmepụta carbide na carbon.
Maka graphite ma ọ bụ dayamọnd na-enweghị ọgwụgwọ elu, enwere ike iji ọla ndị na-emeju ihe dị na tebụl 16 maka brazing ozugbo. Ọtụtụ n'ime ọla ndị a na-emeju ihe bụ ihe ndị e ji titanium mee ma ọ bụ ihe ndị e ji titanium mee. Titanium dị ọcha na-emeghachi omume nke ọma na graphite, nke nwere ike ịmepụta oyi akwa carbide dị oke arọ, ihe mgbakwunye mgbasa ya dị iche na nke graphite, nke dị mfe ịmepụta mgbawa, yabụ enweghị ike iji ya dị ka ihe na-agbaze. Mgbakwunye nke Cr na Ni na Ti nwere ike ibelata ebe agbaze ma melite mmiri mmiri site na seramiiki. Ti bụ ihe mgbakwunye ternary, nke mejupụtara Ti Zr karịsịa, yana mgbakwunye nke TA, Nb na ihe ndị ọzọ. O nwere obere ihe mgbakwunye nke mgbasawanye linear, nke nwere ike ibelata nrụgide brazing. Ihe mgbakwunye ternary nke mejupụtara Ti Cu dabara adaba maka brazing nke graphite na ígwè, nkwonkwo ahụ nwekwara nnukwu iguzogide corrosion.
Tebụl 16 ọla ndị na-ejupụta brazing maka brazing kpọmkwem nke graphite na dayamọnd
(3) Usoro nhazi brazing nwere ike kewaa ụzọ nhazi brazing nke graphite ụzọ abụọ, otu bụ nhazi brazing mgbe emechara nhazi elu, nke ọzọ bụ nhazi brazing na-enweghị ọgwụgwọ elu. N'agbanyeghị usoro ejiri mee ihe, a ga-edozi njikọta ahụ tupu ejikọta ya, a ga-ejikwa mmanya ma ọ bụ acetone hichaa ihe ndị na-emerụ emerụ nke ihe graphite. Ọ bụrụ na emee nhazi metalization elu, a ga-etinye oyi akwa nke Ni, Cu ma ọ bụ oyi akwa nke Ti, Zr ma ọ bụ molybdenum disilicide n'elu graphite site na iji plasma fesa, wee jiri ígwè ihe mejupụtara ọla kọpa ma ọ bụ ọla nchara mee nhazi brazing. Nhazi brazing ozugbo na ihe mejupụtara solder na-arụ ọrụ bụ ụzọ kachasị eji ugbu a. Enwere ike ịhọrọ okpomọkụ brazing dịka ihe ngwakọta enyere na tebụl 16 si dị. Enwere ike ijikọ ihe njikọta ahụ n'etiti njikọ brazing ma ọ bụ nso otu njedebe. Mgbe ejiri ígwè nwere nnukwu ihe mejupụtara nke mgbasa okpomọkụ mee nhazi brazing, enwere ike iji Mo ma ọ bụ Ti nwere ọkpụrụkpụ ụfọdụ dị ka oyi akwa nchekwa etiti. Oyi akwa mgbanwe nwere ike imepụta mgbanwe plastik n'oge kpo oku brazing, na-amịkọrọ nrụgide okpomọkụ ma zere mgbawa graphite. Dịka ọmụmaatụ, a na-eji Mo eme ihe dị ka njikọ mgbanwe maka ime ka ihe ndị mejupụtara graphite na hastelloyn ghara ịcha. A na-eji ihe na-agbaze B-pd60ni35cr5 nke nwere ezigbo iguzogide ire ere nnu gbazere agbaze na radieshon. Okpomọkụ ime ka ihe na-agbaze bụ 1260 ℃ ma na-echekwa okpomọkụ ahụ ruo nkeji iri.
Enwere ike iji b-ag68.8cu16.7ti4.5, b-ag66cu26ti8 na ihe ndị ọzọ na-arụ ọrụ na-agbaze diamond eke. A ga-eji ihe mkpuchi ahụ mee ihe n'okpuru oghere ikuku ma ọ bụ obere argon. Okpomọkụ brazing ekwesịghị ịgafe 850 ℃, a ga-ahọrọkwa ọsọ ọkụ ngwa ngwa. Oge ijide na okpomọkụ brazing ekwesịghị ịdị oke ogologo (n'ozuzu ihe dị ka 10s) iji zere ịmepụta oyi akwa tic na-aga n'ihu na interface. Mgbe a na-agbaze diamond na alloy metal, a ga-agbakwunye oyi akwa plastik ma ọ bụ obere alloy alloy maka mgbanwe iji gbochie mmebi nke mkpụrụ diamond nke nrụgide okpomọkụ dị oke njọ kpatara. A na-emepụta ngwaọrụ ntụgharị ma ọ bụ ngwaọrụ na-agwụ ike maka igwe nhazi ultra precision site na usoro brazing, nke na-agbaze 20 ~ 100mg obere diamond n'ahụ ígwè ahụ, ike nkwonkwo nke nkwonkwo brazing na-erukwa 200 ~ 250mpa.
Enwere ike iji ọkụ, ugboro ugboro dị elu ma ọ bụ oghere mee ka diamond polycrystalline sie ike. A ga-eji ígwè ma ọ bụ nkume mee ka ọkpụkpụ diamond dị elu ma ọ bụ ihe e ji akwọ ihe. A ga-ahọrọ ígwè na-eji ihe na-agbaze ihe nke Ag Cu Ti nke nwere obere ebe ịgbaze. A ga-achịkwa okpomọkụ brazing n'okpuru 850 ℃, oge okpomọkụ agaghị adị oke ogologo, a ga-ejikwa ọsọ oyi nwayọ. Bits diamond polycrystalline nke ejiri na mmanụ ala na ala rụọ ọrụ nwere ọnọdụ ọrụ na-adịghị mma ma na-ebu nnukwu ibu. Enwere ike ịhọrọ ígwè na-eji ihe na-agbaze ihe nke nickel dabere na ya, enwere ike iji foil ọla kọpa dị ọcha dị ka ihe dị n'etiti maka brazing vacuum. Dịka ọmụmaatụ, a na-etinye capsules 350 ~ 400 Ф 4.5 ~ 4.5mm polycrystalline diamond columnar n'ime oghere nke ígwè 35CrMo ma ọ bụ 40CrNiMo iji mepụta ezé e ji egbutu. A na-eji brazing vacuum eme ihe, ogo vacuum adịghịkwa ala karịa 5 × 10-2Pa, okpomọkụ brazing bụ 1020 ± 5 ℃, oge njide bụ 20 ± 2 nkeji, ike shear nke nkwonkwo brazing karịrị 200mpa.
N'oge brazing, a ga-eji ibu arọ nke njikọta ahụ mee ihe maka njikọta na nhazi ya dịka o kwere mee iji mee ka akụkụ ígwè ahụ pịa graphite ma ọ bụ ihe polycrystalline dị n'elu. Mgbe ị na-eji ihe nkwụnye ahụ maka nhazi, ihe nkwụnye ahụ ga-abụ ihe nwere oke mmụba okpomọkụ yiri nke njikọta ahụ.
Oge ozi: Jun-13-2022