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Ukuziphatha kwe-oxidation yama-rails ngesikhathi sokugaya

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Ukuziphatha kwe-oxidation yama-rails ngesikhathi sokugaya

2024-12-25
Ngesikhathi sokusebenzisana phakathi kwama-abrasives namarayili, ukuwohloka kwepulasitiki kojantshi kudala ukushisa, futhi ukungqubuzana phakathi kwama-abrasives nezinto zikaloliwe nakho kudala ukushisa kokugaya. Ukugaya kwezinsimbi zensimbi kwenziwa emkhathini wemvelo, futhi phakathi nenqubo yokugaya, impahla yensimbi yensimbi i-oxidized ngokungenakugwenywa ngaphansi kokushisa kokugaya. Kunobudlelwano obuseduze phakathi kwe-oxidation yendawo yezinsimbi zensimbi nokushiswa kukaloliwe. Ngakho-ke, kuyadingeka ukutadisha ukuziphatha kwe-oxidation yendawo yesitimela ngesikhathi sokugaya.

Kuye kwabikwa ukuthi izinhlobo ezintathu zamatshe okugaya anamandla okucindezela zalungiswa, ezinamandla angu-68.90 MPa, 95.2 MPa, kanye ne-122.7 MPa, ngokulandelana. Ngokomyalelo wamandla amatshe okugaya, i-GS-10, GS-12.5, ne-GS-15 isetshenziselwa ukumela la maqembu amathathu amatshe okugaya. Kumasampuli wesitimela wensimbi agaywe ngamasethi amathathu amatshe okugaya i-GS-10, GS-12.5, ne-GS-15, amelwe ngokulandelana yi-RGS-10, RGS-12.5, ne-RGS-15. Yenza izivivinyo zokugaya ngaphansi kwezimo zokugaya ze-700 N, 600 rpm, namasekhondi angu-30. Ukuze uthole imiphumela yokuhlola enembile, itshe lokugaya ujantshi lithatha imodi yokuxhumana yephinikhodi. Hlaziya ukuziphatha kwe-oxidation kwendawo yesitimela ngemva kokugaya.

I-surface morphology yesitimela sensimbi ephansi yabonwa futhi yahlaziywa kusetshenziswa i-SM ne-SEM, njengoba kuboniswe ku-Fig.1. Imiphumela ye-SM ye-ground rail surface ibonisa ukuthi njengoba amandla etshe lokugaya ekhula, umbala wesitimela saphansi uyashintsha usuka koluhlaza okwesibhakabhaka nokuphuzi kuya kumbala wokuqala wesitimela. Ucwaningo luka-Lin et al. wabonisa ukuthi lapho izinga lokushisa lokugaya lingaphansi kuka-471 ℃, ubuso besitimela bubonakala bunombala ovamile. Uma izinga lokushisa lokugaya liphakathi kuka-471-600 ℃, ujantshi ubonisa ukusha okuphuzi okukhanyayo, kuyilapho izinga lokushisa lokugaya liphakathi kuka-600-735 ℃, ingaphezulu lesitimela libonisa ukusha okuluhlaza okwesibhakabhaka. Ngakho-ke, ngokusekelwe ekushintsheni kombala wendawo yesitimela somhlaba, kungase kuthiwe njengoba amandla etshe lokugaya ehla, izinga lokushisa lokugaya liyakhula kancane kancane futhi izinga lokushiswa kwesitimela liyakhula. I-EDS yasetshenziselwa ukuhlaziya ukwakheka kwesisekelo sendawo yesitimela yensimbi ephansi kanye nephansi lemfucumfucu. Imiphumela yabonisa ukuthi ngokwanda kwamandla amatshe okugaya, okuqukethwe kwe-O element ebusweni besitimela kwehla, okubonisa ukuncipha kokubopha kwe-Fe ne-O phezu kwesitimela, kanye nokwehla kwezinga le-oxidation. kajantshi, okuhambisana nokuthambekela kokushintsha kombala ebusweni besitimela. Ngesikhathi esifanayo, okuqukethwe kwe-O element endaweni engezansi yemfucumfucu yokugaya nakho kuncipha ngokwanda kwamandla amatshe okugaya. Kuyaphawuleka ukuthi ebusweni bomhlaba wesitimela wensimbi ngetshe elifanayo lokugaya kanye nendawo engaphansi yemfucumfucu yokugaya, okuqukethwe kwe-O element ebusweni bokugcina kuphakeme kunangaphambili. Ngesikhathi sokubunjwa kwemfucumfucu, ukuguqulwa kwepulasitiki kwenzeka futhi ukushisa kukhiqizwa ngenxa yokucindezelwa kwama-abrasives; Phakathi nenqubo yokuphuma kwemfucumfucu, indawo engaphansi yemfucumfucu igudla indawo engaphambili ye-abrasive futhi ikhiqize ukushisa. Ngakho-ke, umphumela ohlangene wokuwohloka kwemfucumfucu nokushisa okungqubuzanayo kuholela ezingeni eliphakeme le-oxidation endaweni engaphansi yemfucumfucu, okuholela ekuqukekeni okuphezulu kwesici se-O.
Ukuziphatha kwe-oxidation yama-rails du1

(a) Amandla aphansi okugaya itshe eliphansi lensimbi yesitimela (RGS-10)

Ukuziphatha kwe-oxidation yama-rails du2

(b) Indawo engaphezulu yensimbi kaloliwe enetshe lokugaya elinamandla amaphakathi (RGS-12.5)

Ukuziphatha kwe-oxidation yama-rails du3

(c) Amandla aphezulu okugaya itshe eliphansi lensimbi yensimbi (RGS-15)
Umdwebo 1. I-Surface morphology, i-debris morphology, kanye nokuhlaziywa kwe-EDS kwezinsimbi zensimbi ngemva kokugaya ngamatshe ahlukene okugaya.
Ukuze kuqhutshekwe kuphenywe ngemikhiqizo ye-oxidation ebusweni bojantshi bensimbi kanye nokuhluka kwemikhiqizo ye-oxidation enezinga lokushiswa komhlaba wesitimela, i-X-ray photoelectron spectroscopy (XPS) yasetshenziswa ukuze kutholwe isimo samakhemikhali sezinto kungqimba lomhlaba oseduze. yezinsimbi zensimbi eziphansi. Imiphumela ikhonjiswe ku-Fig.2. Imiphumela egcwele yokuhlaziywa kwe-spectrum yendawo yesitimela ngemva kokugaya ngamandla ahlukene amatshe okugaya (Fig.2 (a)) ibonisa ukuthi kukhona ama-C1s, O1s, kanye neziqongo ze-Fe2p endaweni yesitimela ephansi, futhi iphesenti lama-athomu e-O liyancipha izinga lokusha endaweni yesitimela, elihambisana nephethini yemiphumela yokuhlaziywa kwe-EDS endaweni yesitimela. Ngenxa yokuthi i-XPS ithola izimo eziyisisekelo eduze kongqimba olungaphezulu (cishe u-5 nm) wezinto ezibonakalayo, kunomehluko othile ezinhlotsheni nokuqukethwe kwezinto ezitholwe i-spectrum egcwele ye-XPS uma kuqhathaniswa ne-substrate yensimbi yensimbi. I-C1s peak (284.6 eV) isetshenziswa kakhulu ukulinganisa amandla okubopha ezinye izakhi. Umkhiqizo oyinhloko we-oxidation ebusweni bezinsimbi zensimbi yi-Fe oxide, ngakho-ke i-spectrum encane ye-Fe2p ihlaziywa ngokuningiliziwe. I-Fig.2 (b) kuya ku-(d) ibonisa ukuhlaziywa kwe-spectrum emincane ye-Fe2p ebusweni bezinsimbi zensimbi i-RGS-10, i-RGS-12.5, ne-RGS-15, ngokulandelanayo. Imiphumela ikhombisa ukuthi kuneziqongo zamandla ezimbili ezibophezelayo ku-710.1 eV kanye no-712.4 eV, okudalwe ku-Fe2p3/2; Kukhona iziqongo zamandla ezibophayo ze-Fe2p1/2 ku-723.7 eV naku-726.1 eV. Ukuphakama kwesathelayithi ye-Fe2p3/2 kuku-718.2 eV. Iziqongo ezimbili ku-710.1 eV kanye no-723.7 eV zingase zibalulwe amandla abophezelayo e-Fe-O ku-Fe2O3, kuyilapho ukuphakama okungu-712.4 eV nokungu-726.1 eV kungase kubalulwe emandleni abophezelayo e-Fe-O ku-FeO. Imiphumela ibonisa ukuthi i-Fe3O4 Fe2O3. Ngaleso sikhathi, alikho inani eliphakeme lokuhlaziya elitholwe ku-706.8 eV, okubonisa ukungabikho kwe-elemental Fe endaweni yesitimela ephansi.
Ukuziphatha kwe-oxidation yama-rails du4
(a) Ukuhlaziywa kwe-spectrum ephelele
Ukuziphatha kwe-oxidation yama-rails du5
(b) RGS-10 (okuluhlaza okwesibhakabhaka)
Ukuziphatha kwe-oxidation yama-rails du6
(c) RGS-12.5 (okuphuzi ngokukhanyayo)
Ukuziphatha kwe-oxidation yama-rails du7
(d) RGS-15 (umbala wangempela wesitimela sensimbi)

Fig.2. Ukuhlaziywa kwe-XPS kwezindawo zesitimela ezinamadigri ahlukene okusha

Amaphesenti wendawo ephakeme kakhulu ku-spectrum ye-Fe2p abonisa ukuthi kusukela ku-RGS-10, RGS-12.5 kuya ku-RGS-15, amaphesenti endawo ephakeme kakhulu ye-Fe2+2p3/2 kanye ne-Fe2+2p1/2 akhuphuka, kuyilapho amaphesenti endawo ephakemeyo ye-Fe3+ 2p3/2 kanye ne-Fe3+2p1/2 yehla. Lokhu kubonisa ukuthi njengoba izinga lokusha kwendawo ujantshi lincipha, okuqukethwe kwe-Fe2+ emikhiqizweni ye-oxidation engaphezulu kuyakhula, kuyilapho okuqukethwe kwe-Fe3+ kuncipha. Izingxenye ezihlukene zemikhiqizo ye-oxidation ziphumela emibalabala ehlukene yesitimela esingaphansi. Lapho izinga lokushiswa kwendawo liphakeme (okuluhlaza okwesibhakabhaka), kuyanda okuqukethwe kwemikhiqizo ye-Fe2O3 ku-oxide; Idigri ephansi yokusha kwendawo, kuyanda okuqukethwe kwemikhiqizo ye-FeO.