Ndeipi simba reiyo isingawanzo pasi oxides mune ceramic coatings?

Ceramics, simbi zvinhu uye polymer zvinhu zvakanyorwa sezvinhu zvitatu zvakakura zvakasimba. Ceramic ine zvinhu zvakawanda zvakanakisa, senge tembiricha yekudzivirira, corrosion resistance, kupfeka kuramba, nezvimwewo, nekuti atomic bonding modhi yeceramic ionic bond, covalent bond kana yakasanganiswa ion-covalent bond ine high bond simba. Ceramic coating inogona kushandura chitarisiko, chimiro uye kuita kwekunze kweiyo substrate, Coating-substrate composite inofarirwa nekuita kwayo kutsva. Inogona kusanganisa hunhu hwekutanga hwe substrate nehunhu hwekupikiswa kwekushisa kwepamusoro, kusapfeka kwepamusoro uye kushomeka kwakanyanya kwezvinhu zveceramic, uye kupa kutamba kwakazara kune zvakazara zvakanakira emhando mbiri dzezvinhu, saka inoshandiswa zvakanyanya mumhepo. , ndege, kudzivirira kwenyika, indasitiri yemakemikari uye mamwe maindasitiri.

Rare pasi inonzi "pfuma yeimba" yezvinhu zvitsva, nekuda kweiyo yakasarudzika 4f yemagetsi chimiro uye yemuviri nemakemikari zvinhu. Nekudaro, zvakachena zvisingawanzo simbi zvepasi hazviwanzo shandiswa zvakananga mukutsvagisa, uye zvisingawanzo pasi makomisheni anonyanya kushandiswa. Mishonga inonyanyozivikanwa ndeye CeO2, La2O3, Y2O3, LaF3, CeF, CeS uye isingawanzoiti pasi ferrosilicon.Izvi zvisingawanzo pasi pasi zvinosanganiswa zvinogona kuvandudza chimiro uye zvinhu zveceramic zvinhu uye machira e ceramic.

Ini ndinoshandisa zvisingawanzo pasi oxides mune ceramic zvinhu

Kuwedzera zvisingawanzo zvinhu zvepasi sezvigadzika uye sintering AIDS kune akasiyana ceramics zvinogona kuderedza kupisa kwekupisa, kunatsiridza kusimba uye kuoma kwemamwe maumbirwo ekeramics, uye nekudaro kuderedza mutengo wekugadzira. Panguva imwecheteyo, zvisingawanzo zvinhu zvepasi zvinoitawo basa rakakosha mune semiconductor gasi sensors, microwave midhiya, piezoelectric ceramics uye mamwe anoshanda ceramics. Tsvagiridzo yakawana kuti, Kuwedzera maviri kana anopfuura mashoma epasi oxides kune alumina ceramics pamwe chete zviri nani pane kuwedzera imwe isingawanzo yepasi oxide kune alumina ceramics. Mushure mekugadzirisa bvunzo, Y2O3 + CeO2 ine yakanakisa mhedzisiro. Kana 0.2% Y2O3 + 0.2% CeO2 yawedzerwa pa1490 ℃, hukama hwehukama hwemasamples akaiswa anogona kusvika 96.2%, iyo inodarika density yemasamples nechero isingawanzo pasi oxide Y2O3 kana CeO2 chete.

Mhedzisiro yeLa2O3 + Y2O3, Sm2O3 + La2O3 mukusimudzira sintering iri nani pane iyo yekuwedzera chete La2O3, uye kuramba kupfeka kuri pachena kwakagadziridzwa. Inoratidzawo kuti kusanganiswa kwemaviri epasi asingawanzo oxides hakusi nyore kuwedzera, asi kune kuwirirana pakati pavo, iyo inonyanya kubatsira kune sintering uye kuvandudza kushanda kwealuminium ceramics, asi nheyo inoramba ichidzidzwa.

Pamusoro pezvo, zvinoonekwa kuti kuwedzera kweiyo yakasanganiswa isingawanzo pasi simbi oxides seSintering AIDS inogona kuvandudza kutama kwezvinhu, kukurudzira sintering yeMgO ceramics uye kuvandudza density. Zvisinei, kana zviri mukati mesanganiswa yesimbi oxide inopfuura 15%, hukama hwehukama hunoderera uye porosity yakazaruka inowedzera.

Chechipiri, pesvedzero yeasingawanzo pasi oxides pazvinhu zveceramic coatings

Tsvagiridzo iripo inoratidza kuti zvisingawanzo zvinhu zvepasi zvinogona kukwenenzvera saizi yezviyo, kuwedzera density, kugadzirisa microstructure uye kuchenesa chimiro. Inoita basa rakasiyana-siyana mukuvandudza simba, kuoma, kuoma, kusapfeka uye kuramba kwemarara kweceramic coatings, iyo inovandudza mashandiro eceramic coatings kune imwe nhanho uye kuwedzera huwandu hwekushandisa kweceramic coatings.

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Kuvandudzwa kwemakanika zvivakwa zveceramic coatings neasingawanzo pasi oxides

Rare Earth oxides inogona kuvandudza zvakanyanya kuoma, kubhenda simba uye kusimba kwekubatanidza kweceramic coatings. Mhedzisiro yekuedza inoratidza kuti simba rekusimba rejasi rinogona kuvandudzwa nekushandisa Lao _ 2 sekuwedzera muAl2O3 + 3% TiO _ 2 zvinhu, uye iyo tensile bond simba inogona kusvika 27.36MPa kana huwandu hweLao _ 2 huri 6.0 %. Kuwedzera CeO2 ine chikamu chechikamu che3.0% uye 6.0% muCr2O3 zvinhu,Kusimba kwekubatana kweiyo coating iri pakati pe18 ~ 25MPa, iyo yakakura kudarika yekutanga 12 ~ 16MPa Zvisinei, kana zviri mukati meCeO2 iri 9.0%, iyo tensile bond simba rinodzikira kusvika 12 ~ 15MPa.

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Kuvandudzwa kweiyo thermal shock resistance yeceramic coating nenyika isingawanzo

Thermal shock resistance test muyedzo wakakosha kuratidza zvinesimba simba rekubatanidza pakati pejasi uye substrate uye kuenzanisa kweyekupisa yekuwedzera coefficient pakati pejasi uye substrate. Iyo inonyatso ratidza kugona kwekupfekedza kuramba kupeuka kana tembiricha ichichinja zvakasiyana panguva yekushandiswa, uye zvakare inoratidza kugona kwekupfeka kupikisa mechanical kuvhunduka kuneta uye kugona kwekubatanidza ne substrate kubva parutivi. Naizvozvo, ndicho chinhu chakakosha kutonga kunaka kweceramic coating.

Tsvagiridzo iyi inoratidza kuti kuwedzera kwe3.0% CeO2 kunogona kuderedza porosity uye saizi yepore mujasi, uye kuderedza kushushikana kwekushushikana pamucheto wepores, nekudaro ichivandudza kupisa kwekuvhunduka kweCr2O3 coating. Nekudaro, iyo porosity yeAl2O3 yeceramic coating yakadzikira, uye iyo yekubatanidza simba uye kupisa kwekutya kutadza hupenyu hwejasi kwakawedzera pachena mushure mekuwedzera LaO2. Kana iyo yekuwedzera huwandu hweLaO2 iri 6% (chikamu chehukuru), Kupisa kwekuvhundutsa kwekupotera ndiko kwakanyanya, uye hupenyu hwekusatya kwekupisa hunogona kusvika 218 nguva, ukuwo kutyisa kwekutadza hupenyu hwejasi pasina LaO2 ingori 163 chete. nguva.

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Rare Earth oxides inokanganisa kusamira kwekupfeka kwejasi

Maokisi epasi asingawanzo anoshandiswa kuvandudza kupfekedzwa kwekupokana kweceramic coatings anowanzo CeO2 uye La2O3. Yavo hexagonal layered chimiro inogona kuratidza yakanaka lubrication basa uye kuchengetedza yakagadzikana makemikari zvimiro pakupisa kwepamusoro, izvo zvinogona kunyatso kuvandudza kupfeka kuramba uye kuderedza friction coefficient.

Tsvagiridzo inoratidza kuti friction coefficient yejasi ine huwandu hwakakodzera hweCeO2 idiki uye yakagadzikana. Zvave zvichinzi kuwedzera La2O3 kune plasma yakapfapfaidzwa nickel-based cermet coating inogona kudzikisa friction kupfeka uye friction coefficient yejasi, uye iyo friction coefficient yakagadzikana nekushanduka kushoma. Iyo yakapfekwa pamusoro peiyo cladding layer isina isingawanzo ivhu inoratidza kunamira kwakakomba uye brittle kutyoka uye spalling,Zvisinei, iyo yekupfeka ine isingawanzo ivhu inoratidza kunamira kusina kusimba panzvimbo yakasakara, uye hapana chiratidzo chenzvimbo yakakura-inoputika. Iyo microstructure yeasingawanzo pasi-doped coating ine denser uye yakawanda compact, uye ma pores akaderedzwa, izvo zvinoderedza avhareji yekukwesha simba inotakurwa ne microscopic zvimedu uye inoderedza kukweshera uye kupfeka Doping isingawanzo pasi inogona zvakare kuwedzera kristaro ndege chinhambwe checermets, Inotungamira. kune shanduko yesimba rekubatana pakati pezviso zviviri zvekristaro uye inoderedza friction coefficient.

Pfupiso:

Kunyange zvazvo zvisingawanzoitiki pasi oxides akaita budiriro huru mukushandiswa kweceramic zvinhu uye machira, ayo anogona zvinobudirira kuvandudza microstructure uye michina zvinhu zveceramic zvinhu uye machira, kuchine zvakawanda zvisingazivikanwi zvivakwa, kunyanya mukuderedza friction uye kupfeka. simba uye kupfeka kuramba kwezvishandiso zvinobatana neazvo ekuzora zvivakwa zvave kutungamira kwakakosha kwakakodzera kukurukurwa mumunda we tribology.

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