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 izinhlanganisela 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 ezingavamile njengezinzinzisi kanye ne-AIDS e-sintering kuma-ceramics ahlukene kunganciphisa izinga lokushisa elishisayo, kuthuthukise amandla kanye nokuqina kwezinye izitsha zobumba zesakhiwo, futhi ngaleyo ndlela kunciphise 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, zikhulise 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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Ukwenziwa ngcono kwezakhiwo zemishini zokumboza nge-ceramic ngama-oxide omhlaba 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 uma 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 lokwemboza ukumelana nokuxebuka lapho izinga lokushisa lishintsha ngokushintshana ngesikhathi sokusetshenziswa, futhi libonisa ikhono le-coating lokumelana 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 ye-friction.

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 lesendlalelo esihlanganisiwe ngaphandle komhlaba ongavamile libonisa ukunamathela okukhulu kanye nokuphuka okuphukayo kanye ne-spalling,Kodwa-ke, ukugqoka okuqukethe umhlaba ongavamile kukhombisa ukunamathela okubuthakathaka endaweni egugile, futhi alukho uphawu lwe-spalling yendawo enkulu. I-microstructure ye-earth-doped coating engavamile iminyene futhi ihlangene kakhulu, 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, Iyahola. ekushintsheni kwamandla okusebenzelana phakathi kobuso obuyikristalu obubili 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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