Fahamka Xataraha Oxidation ku Vacuum Brazing leh Qaanso Gaaban

Sababta Oxidation ay quruxsadaan Integriteeda Midhaha Dhagaha marka la sinter

Marka laabidhka dhacdo waqtiga laabida vacuuym, waxay sameeyaa takhaarro qalabnimo ah u dhexeeya meelaha lagu laabayo oo ku xun kara fasaxa u dhexeeya alaabta iyo dhulka fulmis ama si toos ah 34% sano kuler ka hor iyadoo ASM International heysata. Hata jirrad ahaan yar ah habdhudhka, sannadkii laga soo bilaabo 0.01%, waa sidoo kale siin kartaa chromium oxide ku tiisaya alloy-ka tipiciimka ah ee nickel-chromium. Tan ku jirna waxay kuxun kartaan isku daynta u dhexeeya alaabta iyo jidhka metal-ka marka la wado xeel. Shacabkan waa laabaa sababtoo ah in laabidhka metal-kan ku xun kara saamimaha alaabta loo doorto graphite. Qaar ka mid ah tijaabooyinka danbe ayaa arkay in isbeddelka carbon waddo si 15% ka badan marka uu jirro oxygene contamination, sida la sheegay Journal of Materials Processing Technology 2022. Alaabshaha alaabta laabida, inay ilaaliyaan sooqilka laabidhka waxa uu muhiim u tahay inay ilaaliyaan saxidnimada alaabta iyo shaqada marjamaadeed.

Khaaska Xabaasha Khaaska Ah ee Oxygen ku Xidhiidhka Degmada Midab-Diamond

Waxa loo yaqaan dhaawacyada khalka iyo xiddigaha duurka aad u dhacdo duurkaha vakuum ay marwado sida habka Arrhenius, halkaas oo qofka oxygen ay laaban doonto inay ka badbaado kila 55 daraja Celsius muddo xiddigaha duurka. Marka la shaqeeyo bogga 900 daraja Celsius marka la sinterayo, jirrad yar yar oo oxygen - sannad 0.0001 millibar fakkaana - waxay keeni kartaa horumarinta chromium oxide kuwa alloyed braze. Tani waxay leedahay natiijooyin waaweyn ku saabsan helitaanka diamond, gaar ahaan ku qaybiyeyna midho 20% ilaa 40%, sida loo isticmaalay Materials Science and Engineering 2021. Waayo, nidaamka vakuum cusub ee maanta ay daloolsaday tusaale kan si toos ah. Waxay raadinaysaa xabaashaha khaaska si joogto ah, iyagoo ilaalinaya qofka oxygen si aan ugu yaraan xarunta noqod 0.00005 millibar dhammaan haya'adda kororinteed.

Xafiiska Qorax: Dhexdhexaadka Cr-Oxide iyo Dhibaatada Isku-dhafka ee Isku dhaggeysiga Ni-Cr Hadhelo 900°C

Waxaa la oggolay in isku-dhafka NiCr-7 ay muujiyaan in dhexdhexda oxide ay ka badan tahay sida aad uga jiraan habka isku dhaggeysiga:

Thickinesska Oxide	Ka Helitaanka Xoogga Ku Dhufashada	Kiisaha Dhaggeynta Diamond
0.5 µm	92%	8%
2.1 µm	66%	27%
4.3 µm	41%	52%

Samplalka si loo gaaro 2 µm dhexdhexda oxide ayaa ku dhacday dhibaatada isku dhafka buuxda ganacsatid 50 saacadood. Kadib marka hore, kibladda lagula tayo hadhinta vacuum ( <10^2 µmbar) ayaa ilaalinaysa 98% xoogga ganacsatid 200 saacadood (IWTO Conference Proceedings 2023), taas oo muujinaya in ay noqon doontaa in la ilaaliyo in ay ka badan tahay oxidation manufacturing toolska diamond.

Sarreefa Hoosega Vacuum si loo ilaaliyo Oxidation

Maamulka geesaha hore iyo geesaha ka soo baxa ee ku yaal dhulka vakwamiga ah

Hata geeska hore oo keliya 20 qood kaga duwan miloon waxay sabab tahay arrimo jabeed siisnaan la'aanta dhammaan marka ay sii socdaan sintering. Tanu wuxuu noqon kara in biloodku u dhaafan doonto 63% ka yar marka ay geesaha oksaydka ka sii kala duwan 1 mikron, taasoo lagu sheegay IMR ee 2023. Si loo daryeelin arimihii, dhulka vakwamiga ee hore waxay horumardeen xaqiijin badan loo saarayo geesaha aan rabnayn. Ugu horree, waxay kordhinayaan komponenitada ilaa 450 digri Seelshiyeys (Celsius) siiba 90 daqiiqo si ay u soo baxaan geesaha la dhigay. Marka xallinta, isku daylanaashadu beddelanayaan ilaa waraqa iskudhigga ahaan aynu gabi ahaan u soo diririn (ka yar ama 0.05% geesaha waaweyn). Udambe, shaqsiyaddu ilaaliyaan dabaggalka geesaha sidoo kale heerarka kordhinta si ay u hubiyaan in dhammaan waxay socdaan heeraha aamin.

Soo saarna vakwamiga weyn (<10^2 µmbar) si loo daryeelido reyshonada oksaydka

Wakhtiga 10^2 µmbar, nolosha waqooyi ee molekyuulka oksijin ayaa gaadhaya 10 km—kuwaas oo si fiican u kala dhigaysa isku-dhafka oo ka dhasha in la oksijinayo. Tijaabooyinka dambeyska ah waxay muujinaysaa kala duwiddii 97% ee Cr₂O₃ la sameeyo marka la keydsado xaddiga kan 750–900°C ee jaraadka jiritaanka (Yaalaha 2024 ee Shaqada Jaraadka Sare).

Habararka Vakwam (mbar)	Wakhtiga Dhexdooda (daqiiqo)	Kiisaska Oksijininta (mg/cm²)
10³	30	0.42
10´	30	0.15
10²	30	0.03

Habal: Sida loo qaado vakwam iyo raad-raaca habararka in lagu hortago in ay ku oksijin lahayd

Nidaamaha haliyadda ugu dambaysay waxay suurtoon inay gaadho dhulqaanshaha ka hooseeya 10^-4 mbar kama ama 18 daqiiqo berri sababtoo ah noocyo caawisaadka ah ee ku dabbaqaanka. Tariiqada waa caadi ahaan ku dabbaqaanka pumpaska turbomolecular ee leh heerarka 10^-2 mbar, isticmaalaya cold trap-ka oo leh boqolka ka hooseeya kala duwanaansho 140 daraja celsius si ay ku qabsado barafka biyaha, iyo inay ilaalin dookhaha maalmahan iyagoo isticmaalaya helitaanka xaqiiqsanaanta heerka 5x10^-6 mbar litir kila saa. Marka la iibsado dhammaan tariiqdaas, wuxuu ka saaraa jiraalka oksijin badankoodi 80-85% marka loo eego tariiqyada hore. Tanu wuxuu noqon karaa faraansi weyn oo ku saaraayo xuquuqda oo kalsoonidha leh oo kalsoonidha leh, gaar ahaan silvaar-copper-titanium brazing alloys-ka loogu yeero istimaamka muhiimka ah halkaas oo hirarka yar yar ee oksijinta waxay keeni kartaa qalabka guud.

Isticmaal Atmosferaha Ilaalinta si loo dhergo Oksidation

Iskudhafka Hydrogen: Ka saarista Oxides Sare ka hor inta aan la garto

Hawo-qaadista hydrogen-ka waxay ka saartaa oksaydhada dusha sare 8 jeer si wax ku ool ah marka loo eego vacuum-ka saafiga ah oo keliya. Inta u dhaxaysa 750-850°C, hydrogen wuxuu la falgalayaa chromium oxide (Cr2O3) dusha sare ee birta qalabka, isagoo sameynaya uumiga biyaha ee ay ka baxdo bamka vacuum. Nidaamkani wuxuu ka saaraa lakabka oksaydhka 0.20.5 μm/min isagoo ilaalinaya dhalada dheeman.

Isticmaalka isku darka Argon-Hydrogen si loo yareeyo oksaydhka oo la xakameeyo oo ammaan ah

Hawlgallada warshadaha ayaa caadi ahaan isticmaala 410% hydrogen isku darka argon si loo dheelli-dhowrsiiyo falcelinta iyo badbaadada. Argon matrix wuxuu gaabiyaa faafitaanka hydrogen, ka hortagga isku darka qarxa iyadoo la ilaalinayo cadaadiska qaybsiga oksijiinta ee ka hooseeya 1 × 10 ̄ bar. Isku darkan wuxuu u oggolaanayaa in hoos u dhigista oxide-ka oo dhammaystiran 15-30 daqiiqo 800 °C 40% ka dhakhso badan jawiga nitrogen-ku saleysan iyadoo aan halis gelin graphitization dheeman.

Isku dheelitirka falcelinta iyo badbaadada ee hydrogen-ka la caawiyo vacuum brazing

Nidaamka maamuulka waqti hadda ayaa ku hadla in ay ka shaqeeyaan kimiyaan laabka ugu fiican ee haydarjojin, si loo kala joogo qof maraq ah oo ka mid ah heysa. Wixii loo oggolay waxaa lagu garto in 7% haydarjojin lagu geeyo argon wuxuu u fahmi kara in ay kala duwan tahay sifada biraasiinta, marka loo socdo gasaska la yaaba in ay ka sarreeyaan 35% ka dib marka ay ka soo noqdeen. Si loo saarayo dhammaan haydarjojin kasoo baxsan, guud ahaan fasalaha ayaa isticmaalaya taliyada vacuuma saddex jaro, taas oo ku xad gudbiyaya dabaggalka ilaa ka yar sanbililka miliibaar. Taliyadan buuxda wuu saaraa dhammaan molekyuulkii haydarjojin kasoo baxsan inta aan laabka ka baxay, si loo kala duwan tahay sharciyada ISO 15614 saxnaanta in fabrikadaha ayaa inay raacdaan.

Raadinta iyo Kulminta Sare u Murugista Xajinta Termoodinamigga

Xarriirka Isku-dhafka Mitaal-Oksayd: Helitaanka Xataa Isku-dhasha Dhexdhexaad Laga Joogo Jiritaanka Sare

Isticmaalidda xarriirka isku-dhafan ee oxide ka metallo ah ee loo isticmaalo modelisnta thermodynamic ku siinaysaa saamisku horumarinta awoodda oxidation marka la sameeyo shaqada vacuum brazing. Marka la shaqeeya leh alloy-oyinka Ni Cr B si gaar ah, xarriirkan waxay muujinaysaa hababka sarreeya saxda ah oo chromium-ka bilaabaya in uu uusan sii kordhin marka dhererka ka sii koreyn 800 digri Celsius sida loo soo jeedinayo Journal of Thermal Analysis 2022. Xaaladuhu maraansan tahay marka la socda 900C marka haygnta oksijinta gudaha chamber-ka ka sii koreyn 1 mar 10 ilaa -8 mbar, taasuna waxay abuura Cr2O3 si toos ah ku dhufashada, waana laga yaabaa in tan aad u khashmi doonto saw blades industriyan badankooda waqtiga dheer. Geliyanka modelahan in lagu darayo data aqoonsan ee monitoring furnace-ka ayuu ku siinaysaa kooxaha warshadaha inay ilaaliyaan hal-abbaarkan jadooogga si aan lahaan tahay in ay ilaalin ka hortagto tixgilada oxidation aad u xooggan.

Raadinta Hal-Socodka Sii Socod (Dew Point) Waa Isticmaalka Loogu Talagalay Haygnta Oksijinta Gudaha Hawaasha Furnace-ka

Marka la eego habka ku qoran dhululka ka hooseya -50 daraja Celsius, tan badanaa waa inay xaq u tahay heysiga oksijin ee ku tiisna 2 kala duwanaanshaha miliyon kasta oo ka hooseya furduurta vakuumiga sida loo dhacey in sheybnimadeyda Xafiiska Kaalinta Isgaarsiinta 2023. Gudbinta hygrometers infrared marka hore diffusion pumps waxay leedahay falanqaynta mudnaanta daryeelka, kadibna marka qorshooyinka bilaawday in ilaaliya, waayo mararka qaar waxay tilmaamaysaa in jirto buuxin lafteeda cajiin ama ninkaba laab xoog badan. Kuwa shaqeeya leh fikradaha brazing, xaqiijinta habka ku qoran dhulka ka hooseya -60 daraja waxay noqon karaa faraanka weyn. Waxyeeladaha Metals and Materials International waxay tusaysaa in habka ku qoran dhulka aad yar rasaasid oksijinka la heli karo kala duwanaanshaha 87% ka hooseya maqashada caadiga ah ee -40 daraja ee 2021.

Dejinta Hadda La'eg (Habka Ku Qoran Dhulka < -50°C) Si Ay U Hidhaan Cr₂O₃

Marka asteenka ugaaraan tijaabiisay, waxaa la kulmey in kor ugu yartid -50 digri Ceelciyos xagga dew point marka la solder garaf 850 ilaa 920 digri Ceelciyos sabab uuna u dhashay Cr2O3 sannadkii 2021 ka soo baxday warbixinta Surface Engineering. Helitaanka beddelka saxda wuxuu kaa ilaaliyaa alaabta bidhqeedyo iyadoo aan lagu qaliso fikradaha abbaaraha. Sidaas ku gaar ah in lagu helo maqal xoog leh iyo isku daylinta hydrogen marka xagga jabbada hoos u socda. Laakiin haddii aan u socoto hoose -55 digri Ceelciyos, wax si toos ah ay dhacdo leh alloy-ada nickel matrix waxay iskudhafaan kadib 99 boqolkiim inta chromium. Waa muhiim tahay sababtoo ah in lagu ilaaliyo heerka chromium wuxuu kaga ilaaliyaa isku-dhafka solder-ka inay leedahoodo saamaysiga dambdhaaska marka saw blades loo isticmaalo in lagabarto meelaha qalloocan.

Dheganka Sare iyo Isku-dhafka Tashuurka si ay u ilaaliyaan Oxidation

Fikradaha Passivation si ay u ilaaliyaan Substrates Madoobka Horego Solder

Qalabka horreeya ee ku xidhnaa isku qaybinta habaabka ah waxa uu kala dhigaa qiimaha oksijinida 62% ka badan kaliya oo la isku raacayo (Hadalka Sareenka Sare 2024). Qalabka fosfateed iyo khromateed waxay abuuraan tarafaar xoog leh oo yar oo ugu hor in laabato in laabdo, taasoo muhiim ah siinista sawirrada dhaadheer aad u fiican ee lacagta 800–950°C.

Soo saara Cr-Rich ama Qalabka Fosfaatida si ay kala badbaadiyaan in laabdo

Qalabka difyushanka Cr-badnaa (<5 µm thickness) waxay kala badbaadiyaan xawaaraha laabida 40% 900°C ka dib marka loo eego Cr₂O₃. Jarida cusub waxa muujineysa in fasalaha fosfaatida waxay siiyaan kala badbaadinta la iibsan, laakiin aan hexavalent chromium, iyadoo la raacaya xeerarka caalamiga ah ee korontinka koronto koronto.

Isku daynaya joometraka xeerkulka si ay kala duwan kala duwan kala duwan kala duwan kala duwan kala duwan

Ku xir waxgalka kor ugu yar 15 daraja Selsiyos sanadkasta marka dhexeertu ka hooseeyo 700 daraja ayaa kaa ilaalinaysa almasuhu in lagu dhaqmo jirida jir. Laakiin marka aad ka sarraysatid xadka dabaqinta madhan, dhabbarka ayaa la aabo in la kordhiyo ilaa 25 daraja sanadkasta. Mala awgeed, waxyaabahan ku xiran wakhtiga lagu jiray gobolada la jiray in ay dhacdo dhagaysiga. Taasoo la dhacey sanadkii dambe ee hor, taasoo ku saabsan shaqeynta almasuhu gacanta madhan, maqalka laba sannadka si fiican ayaa ku dhisiyey in ay ka qayb tahay kaga qaybinta almasuhu ilaa kaga qaybinta 33% iyo in ay ka qayb tahay kaga qaybinta madhan 34%. Nabadda? Qalabka si degdeg ah ay ka badan tahay iyo jirka jirka si degdeg ah.

Sheelka Caruurta (FAQ)

Waa maxay dhagaysiga heerarka madhan?

Dhagaysiga heerarka madhan waa dhagaysiga madhan oo ku qoran dhulka madhan, taasoo ku dhaqaysa kaga qaybinta komponen, sida almasuhu iyo madhan ee loo isticmaalo in la abuurmo qalab.

Sida dhagaysiga ay ku saaraayo qalabka almasuhu?

Koxidation wuxuu u isticmaali karaa almasaha inay lahaadaan grafayt, kaas oo ka dhimanaysa xidhinta ku tiirsanaa afkaaraha, sidaa daraaddeed lagu dhaqaaqda iyo awoodda xerriga marka loo eego jiritaanka jiritaanka.

Yaa waxa uu yahay habdheeraha iljeedka ee ku jira qotaska?

Habdheeraha iljeedka, sida isjiidka iyo argoonka, waxaa loo isticmaalaa in lagu dhaqmo oxydeedka sare iyo in lagu hortaggo koxidationa marka la qotso, sidaa darteed in lagu kala horumariyo awoodda iyo amniga xerriga.

Sida khaadhka vakwamku u saameynaa khalafka koxidation?

In lagu ilaalo vakwam weyn wuxuu si fiican u dhaqaaqa koxidationa adigoo laga saarayo hababka ay oksijin ku jira inay la kulmaan dhulalka afkaaraha marka la shaqeelo jiritaanka sare.

Yaa waxa uu yahay fikradaha passivation ee ku jira abuurka xerriga almas?

Fikradaha passivation waxay ka kooban in la iskudhafdo dhulalka afkaaraha in lagu sameeyo akoonaha iljeedka si loogu hortago koxidationa marka la qotso, sidaa darteed in lagu ilaallo jiritaanka xerriga.