Liyini ithonya lama-oxyde omhlaba angavamile ezimbotsheni zobumba?

I-Ceramics, izinto zensimbi nezinto ze-polymer zibalwe njengezinto ezintathu ezinkulu eziqinile.I-Ceramic inezinto eziningi ezinhle kakhulu, ezifana nokumelana nezinga lokushisa eliphezulu, ukumelana nokugqwala, ukumelana nokugqokwa, njll., ngoba imodi yokubopha i-athomu ye-ceramic iyibhondi ye-ionic, isibopho esiqinile noma isibopho esixubile se-ion-covalent esinamandla ebhondi ephezulu.I-Ceramic coating ingashintsha ukubukeka, ukwakheka nokusebenza kwendawo yangaphandle ye-substrate,Inhlanganisela ye-Coating-substrate iyathandeka ngokusebenza kwayo okusha.Ingakwazi ukuhlanganisa izici zokuqala ze-substrate nezici zokumelana nokushisa okuphezulu, ukumelana nokugqoka okuphezulu kanye nokumelana nokugqwala okuphezulu kwezinto zobumba, futhi inikeze ukudlala okugcwele kuzinzuzo eziphelele zezinhlobo ezimbili zezinto zokwakha, ngakho-ke isetshenziswa kabanzi ku-aerospace. , ezezindiza, ezokuvikela kuzwelonke, izimboni zamakhemikhali nezinye izimboni.

Umhlaba ongavamile ubizwa ngokuthi "indlu yomcebo" wezinto ezintsha, ngenxa yesakhiwo sawo se-elekthronikhi esingu-4f esiyingqayizivele kanye nezakhiwo zomzimba namakhemikhali.Kodwa-ke, izinsimbi ezihlanzekile zomhlaba ezingavamile azivamile ukusetshenziswa ngokuqondile ocwaningweni, futhi izingxube zomhlaba ezingavamile zisetshenziswa kakhulu.Izinhlanganisela ezivame kakhulu yi-CeO2, i-La2O3, i-Y2O3, i-LaF3, i-CeF, i-CeS kanye ne-ferrosilicon yomhlaba engavamile.Lezi zinhlanganisela zomhlaba ezingavamile zingathuthukisa ukwakheka kanye nezakhiwo ze-ceramic materials kanye ne-ceramic coatings.

Ngisebenzisa ama-oxides omhlaba angavamile ezintweni zobumba

Ukwengeza izakhi zomhlaba eziyivelakancane njengezinzinzisi kanye ne-AIDS ecwilisa izitsha zobumba ezihlukene kunganciphisa izinga lokushisa le-sintering, kuthuthukise amandla nokuqina kwezinye izitsha zobumba zesakhiwo, futhi ngaleyo ndlela kwehlise izindleko zokukhiqiza.Ngesikhathi esifanayo, izakhi zomhlaba ezingavamile nazo zidlala indima ebaluleke kakhulu kuzinzwa zegesi ye-semiconductor, imidiya ye-microwave, i-piezoelectric ceramics nezinye izitsha zobumba ezisebenzayo.Ucwaningo luthole ukuthi, Ukwengeza ama-oxide omhlaba amabili noma ngaphezulu ayivelakancane ku-alumina ceramics ndawonye kungcono kunokwengeza i-earth oxide eyodwa engavamile kuma-alumina ceramics.Ngemuva kokuhlolwa kokwenza kahle, i-Y2O3+CeO2 inomphumela omuhle kakhulu.Uma u-0.2%Y2O3+0.2%CeO2 engezwa ku-1490℃, ukuminyana okuhlobene kwamasampuli ahlanganisiwe kungafinyelela ku-96.2%, okudlula ukuminyana kwamasampuli nganoma iyiphi i-earth oxide eyivelakancane Y2O3 noma i-CeO2 iyodwa.

Umphumela we-La2O3+Y2O3, Sm2O3+La2O3 ekukhuthazeni i-sintering ungcono kunokwengeza i-La2O3 kuphela, futhi ukumelana nokugqokwa ngokusobala kuthuthukisiwe.Kubuye kubonise ukuthi ukuxuba ama-oxides amabili omhlaba angavamile akuyona into elula, kodwa kukhona ukuxhumana phakathi kwabo, okuzuzisa kakhulu ekufakweni nasekuthuthukisweni kokusebenza kwe-alumina ceramics, kodwa isimiso sisazofundwa.

Ngaphezu kwalokho, kutholakala ukuthi ukungezwa kwama-oxide ensimbi angavamile okuxubile njengengculaza ye-sintering kungathuthukisa ukufuduka kwezinto, kukhuthaze ukucwiliswa kwe-ceramics ye-MgO futhi kuthuthukise ukuminyana.Kodwa-ke, lapho okuqukethwe kwe-oxide yensimbi ehlanganisiwe kungaphezu kuka-15%, ukuminyana okuhlobene kuncipha futhi i-porosity evulekile iyanda.

Okwesibili, ithonya lama-oxides omhlaba angavamile ezindaweni ze-ceramic coatings

Ucwaningo olukhona lubonisa ukuthi izakhi zomhlaba ezingavamile zingalungisa usayizi wokusanhlamvu, zikhuphule ukuminyana, zithuthukise i-microstructure futhi zihlanze isixhumi esibonakalayo.Idlala indima eyingqayizivele ekuthuthukiseni amandla, ukuqina, ubulukhuni, ukumelana nokugqoka kanye nokumelana nokugqwala kwezingubo ze-ceramic, okuthuthukisa ukusebenza kwezigqoko ze-ceramic ngezinga elithile futhi kwandise ububanzi bezicelo ze-ceramic coatings.

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Ukuthuthukiswa kwezakhiwo zemishini zokumboza nge-ceramic ngama-oxides angavamile

Ama-oxide omhlaba angavamile angathuthukisa ngokuphawulekayo ubulukhuni, amandla okugoba namandla okubopha okuqinile kwezingubo zobumba.Imiphumela yokuhlola ibonisa ukuthi amandla aqinile okunamathela angathuthukiswa ngempumelelo ngokusebenzisa i-Lao _ 2 njengesengezo ku-Al2O3+3% TiO _ 2 impahla, futhi amandla esibopho esiqinile angafinyelela ku-27.36MPa lapho inani le-Lao _ 2 lingu-6.0 %.Ukwengeza i-CeO2 enengxenye enkulu engu-3.0% kanye no-6.0% ezintweni ze-Cr2O3,Amandla okubopha okuqinile kwe-coating aphakathi kuka-18~25MPa, omkhulu kune-12~16MPa yasekuqaleni Nokho, lapho okuqukethwe kwe-CeO2 kungu-9.0%, ukushuba amandla ebhondi ehla abe ngu-12~15MPa.

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Ukuthuthukiswa kokumelana nokushaqeka okushisayo kwe-ceramic coating ngomhlaba ongavamile

Ukuhlolwa kokumelana nokushaqeka okushisayo kuwukuhlola okubalulekile ukuze kubonise ngokwekhwalithi amandla okubopha phakathi kokumboza ne-substrate kanye nokumataniswa kwe-coefficient yokwandisa okushisayo phakathi kokumboza ne-substrate.Ibonisa ngokuqondile ikhono lokumboza ukumelana nokuxebuka lapho izinga lokushisa lishintsha ngokushintshana ngesikhathi sokusetshenziswa, futhi libonisa ikhono le-coating ukumelana nokukhathala kokushaqeka komshini kanye nekhono lokubopha nge-substrate esuka eceleni.Ngakho-ke, futhi kuyisici esibalulekile ukwahlulela ikhwalithi ye-ceramic coating.

Ucwaningo lubonisa ukuthi ukungezwa kwe-3.0% CeO2 kunganciphisa i-porosity nosayizi we-pore embotsheni, futhi kunciphise ukugxila kwengcindezi emaphethelweni e-pores, ngaleyo ndlela kuthuthukise ukumelana nokushaqeka okushisayo kwe-Cr2O3 coating.Kodwa-ke, i-porosity ye-Al2O3 ye-ceramic coating yehla, futhi amandla okubopha kanye nempilo yokwehluleka kokushaqeka okushisayo kwentokozo yanda ngokusobala ngemva kokwengeza i-LaO2.Lapho inani elingeziwe le-LaO2 liyi-6% (ingxenyana yobuningi), Ukumelana nokushaqeka okushisayo kwe-coating kungcono kakhulu, futhi impilo yokwehluleka kokushaqeka okushisayo ingafinyelela izikhathi ezingama-218, kuyilapho impilo yokwehluleka kokushaqeka kokushisa ngaphandle kwe-LaO2 ingu-163 kuphela. izikhathi.

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Ama-earth oxides ayivelakancane athinta ukumelana nokugqokwa kwama-coatings

Ama-oxide omhlaba ayivelakancane asetshenziselwa ukuthuthukisa ukumelana nokugqokwa kwezingubo zobumba ngokuvamile i-CeO2 ne-La2O3.Isakhiwo sabo se-hexagonal layered singabonisa umsebenzi omuhle wokugcoba futhi sigcine izakhiwo zamakhemikhali ezizinzile ekushiseni okuphezulu, okungathuthukisa ngokuphumelelayo ukumelana nokugqoka futhi kunciphise i-coefficient yokungqubuzana.

Ucwaningo lubonisa ukuthi i-coefficient ye-friction ye-coefficient enenani elifanele le-CeO2 incane futhi izinzile.Kubikwe ukuthi ukwengeza i-La2O3 ku-plasma efuthwe i-cermet ye-cermet esekelwe ku-nickel kunganciphisa ngokusobala ukuguga kokungqubuzana kanye ne-coefficient yokungqubuzana kokunamathela, futhi i-friction coefficient izinzile ngokuguquguquka okuncane.Ingaphezulu eligugile longqimba olunamanzi olungenawo umhlaba ongavamile libonisa ukunamathela okukhulu kanye nokuphuka okuphukayo kanye nokuqhekeka, kodwa-ke, ukunamathela okuqukethe umhlaba ongavamile kubonisa ukunamathela okubuthakathaka endaweni egugile, futhi alukho uphawu lwendawo enkulu ephukayo.I-microstructure ye-earth-doped coating engavamile iminyene futhi ihlangene kakhudlwana, futhi ama-pores ayancishiswa, okunciphisa amandla okungqubuzana okuphakathi athwalwa yizinhlayiya ezincane futhi kunciphise ukungqubuzana nokugqoka i-Doping engavamile yomhlaba kungabuye kukhulise ibanga le-crystal plane lama-cermets, Kuholela ekushintsheni kwamandla okusebenzelana phakathi kobuso obubili bekristalu futhi kunciphisa i-coefficient yokungqubuzana.

Isifinyezo:

Nakuba ama-oxides angavamile emhlabeni enze impumelelo enkulu ekusetshenzisweni kwezinto zobumba kanye nezingubo zokugqoka, ezingathuthukisa ngokuphumelelayo izakhiwo ze-microstructure kanye nemishini ye-ceramic materials ne-coatings, kusenezinto eziningi ezingaziwa, ikakhulukazi ekunciphiseni ukungqubuzana nokugqoka. amandla nokugqoka ukumelana izinto sebenzisana izakhiwo zabo zokugcoba isibe isiqondiso esibalulekile ezifanele ingxoxo emkhakheni tribology.

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