Oxidation Failure Mechanisms ntawm C103 Saum 1200 degree

Nb-Hf C103 alloyyog dav siv nyob rau hauv siab -kub aerospace thiab thermal system Cheebtsam vim nws zoo heev creep kuj thiab lub zog tuav. Txawm li cas los xij, thaum ua haujlwm siab tshaj 1200 degree, oxidation dhau los ua tus tsav tsheb tsis ua haujlwm ntau dua li kev ua haujlwm tsis zoo. Nkag siab txog cov txheej txheem oxidation tsis ua haujlwm ntawm C103 yog qhov tseem ceeb rau kev xaiv cov khoom siv, kev tiv thaiv saum npoo, thiab kev ntsuas lub neej.

C103 yog refractory alloy nrog ib tug niobium matrix, uas yog inherently reactive nrog oxygen nyob rau hauv siab kub.

Hauv qab ~ 1000 degree, oxidation nce qeeb thiab tuaj yeem tsim cov oxide tsis tu ncua. Thaum qhov kub siab tshaj 1200 degree, oxidation kinetics nrawm nrawm vim:

• Nce oxygen diffusion tus nqi rau hauv Nb matrix
• Instability ntawm nto oxides nyob rau hauv thermal stress
• Kev tawg ntawm tej yam ntuj tso tsim passive txheej

Nyob rau theem no, oxidation tsis ua hauj lwm tsis yog linear tab sis exponential nrog kub thiab raug lub sij hawm.

Thawj cov khoom oxidation ntawm C103 yog niobium oxides, feem ntau Nb₂O₅. Cov oxides no nthuav tawm ntau yam tsis zoo ntawm qhov kub thiab txias:

• Kev loj hlob siab nrog kev ua tsis zoo
• Loj ntim expansion, tsim kev ntxhov siab sab hauv
• Tsawg mechanical kev ncaj ncees, nws yooj yim rau tawg thiab spallation

Raws li cov oxide txheej tawg los yog tev tawm, cov hlau tshiab tau nthuav tawm tsis tu ncua, ua rau tus kheej - nrawm oxidation voj voog. Cov txheej txheem no yog qhov tseem ceeb rau oxidation -vim cov khoom poob hauv C103 saum 1200℃.

Tshaj li degradation nto, oxygen nkag mus rau hauv cov hlau substrate los ntawm cov ciam teb thiab qhov tsis xws luag. Qhov no ua rau:

• Tsim cov pa oxygen-enriched brittle txheej hauv qab ntawm qhov chaw
• Qhov tseem ceeb txo nyob rau hauv ductility
• Ntxiv susceptibility rau thermal shock thiab mechanical cracking

Txawm hais tias cov oxides saum npoo raug tshem tawm, cov subsurface embrittlement tseem irreversible, feem ntau txhais qhov kawg kawg - ntawm - lub neej ntawm C103 Cheebtsam nyob rau hauv oxidizing ib puag ncig.

Hafnium hauv C103 muaj txiaj ntsig zoo los ntawm kev txhim kho siab - qhov kub thiab txias tsis kam. Txawm li cas los xij, nws cov txiaj ntsig ntawm oxidation yog txwv tsis pub muaj kev tiv thaiv:

• Hf oxides hauv zos tuaj yeem txhim kho oxide adhesion
• Zuag qhia tag nrho oxidation kuj tseem tswj hwm los ntawm Nb matrix
• Hafnium tsis tsim ib qho txuas ntxiv, tiv thaiv oxide nplai

Yog li, alloy muaj pes tsawg leeg tsis tuaj yeem tiv thaiv oxidation tsis ua haujlwm ntawm qhov kub siab tshaj 1200 degree.

Nyob rau hauv tiag tiag siab -kub tshuab, oxidation tsis ua hauj lwm ntawm C103 feem ntau manifests li:

• Progressive thickness poob vim oxide spallation
• Deg cracking ua rau cov txheej txheem kev nyuaj siab concentration
• Sudden puas tom qab thermal cycling
• Poob qhov kev ruaj ntseg nyob rau hauv nyias- cov khoom phab ntsa

Cov kev ua tsis tiav no feem ntau tshwm sim ua ntej creep lossis melting txwv mus txog, ua oxidation yog thawj qhov txwv.

Rau cov ntawv thov uas muaj C103 siab tshaj 1200℃hauv huab cua lossis oxygen-muaj ib puag ncig, oxidation yuav tsum tau hais nyob rau theem system:

• Siv cov txheej txheem tiv thaiv (silicide, aluminide, lossis ceramic systems)
• Kev ua haujlwm hauv lub tshuab nqus tsev lossis inert cua
• Tsim cov nyiaj pub dawb rau oxidation- cuam tshuam cov khoom poob
• Kev tswj nruj ntawm lub sij hawm raug ntawm qhov kub siab tshaj plaws

Yog tsis muaj cov kev ntsuas no, tsis muaj kev tiv thaiv C103 yuav tsum suav tias tsis tsim nyog rau kev pabcuam ntev tshaj 1200 degree.

Lub oxidation tsis ua hauj lwm mechanisms ntawm C103 saum toj no 1200℃yog dominated los ntawm ceev oxide kev loj hlob, oxide spallation, thiab oxygen -induced embrittlement es tsis yog txhua yam overload. Txawm hais tias C103 tseem yog qhov siab tshaj -kev ua tau zoo refractory alloy, nws cov khoom siv oxidation tsis kam yog txwv, ua rau kev tswj hwm ib puag ncig thiab kev tiv thaiv saum npoo yog qhov tseem ceeb rau kev txhim khu kev ntseeg siab - kub ua haujlwm.