Hav nyob ntawd! Raws li tus neeg muag khoom ntawm Graphite Thrust Bearings, Kuv tau nug ntau zaus txog cov Young's modulus ntawm cov khoom zoo nkauj no. Yog li, kuv xav tias kuv yuav nkag siab - tob rau hauv cov ncauj lus no thiab qhia txhua yam kuv paub nrog koj.
Ua ntej tshaj, cia peb rhuav tshem qhov Young's modulus tiag tiag. Hauv cov ntsiab lus yooj yim, Young's modulus, tseem hu ua elastic modulus, yog ib qho kev ntsuas ntawm cov khoom siv tawv npaum li cas. Nws qhia peb ntau npaum li cas cov khoom yuav deform nyob rau hauv ib tug npaum li cas ntawm kev ntxhov siab nyob rau hauv nws elastic ntau yam. Thaum peb tham txog graphite thrust bearing, nkag siab txog nws cov Young's modulus yog qhov tseem ceeb vim nws pab peb kwv yees seb cov kabmob yuav ua li cas hauv qab load.
Graphite yog ib yam khoom zoo nkauj heev. Nws yog tsim los ntawm cov txheej txheem ntawm carbon atoms teem nyob rau hauv ib tug hexagonal lattice qauv. Cov khaubncaws sab nraud povtseg tau tuav ua ke los ntawm cov tsis muaj zog van der Waals, uas muab graphite qee yam khoom nthuav. Ib qho ntawm cov khoom uas ua rau graphite zoo rau cov kabmob thrust yog nws tus kheej - lubricating xwm. Tab sis thaum nws los txog rau Young's modulus, cov qauv ntawm graphite plays lub luag haujlwm loj.
Cov Young's modulus ntawm graphite tuaj yeem sib txawv me ntsis nyob ntawm ob peb yam. Ib qho ntawm cov ntsiab lus tseem ceeb yog kev taw qhia ntawm graphite txheej. Graphite muaj cov khoom anisotropic, uas txhais tau hais tias nws cov khoom siv kho tshuab tuaj yeem sib txawv nyob ntawm qhov kev taw qhia uas koj ntsuas lawv. Piv txwv li, Young's modulus raws lub dav hlau ntawm cov graphite txheej (hauv - dav hlau) feem ntau yog siab tshaj qhov Young's modulus perpendicular mus rau txheej (tawm - ntawm - dav hlau).
Feem ntau, hauv - dav hlau Young's modulus ntawm graphite tuaj yeem muaj li ntawm 10 GPa mus rau 100 GPa. Qhov ntawd yog qhov dav dav, txoj cai? Yog vim li cas rau qhov kev hloov pauv no yog tias ntau hom graphite tuaj yeem muaj qhov sib txawv microstructures. Piv txwv li, cov kev taw qhia zoo heev pyrolytic graphite (HOPG) muaj cov qauv txiav txim siab heev, thiab nws nyob rau hauv - dav hlau Young's modulus tuaj yeem nyob rau ntawm qhov kawg ntawm qhov ntau, nyob ib ncig ntawm 100 GPa. Ntawm qhov tod tes, ntau cov ntaub ntawv tsis zoo ntawm graphite, zoo li cov siv hauv qee cov ntawv thov kev lag luam, tej zaum yuav muaj ib qho hauv - dav hlau Young's modulus ze rau 10 GPa.
Qhov tawm - ntawm - dav hlau Young's modulus ntawm graphite feem ntau qis dua, feem ntau nyob rau hauv thaj tsam ntawm 1 GPa mus rau 5 GPa. Qhov no yog vim hais tias cov van der Waals rog ntawm cov khaubncaws sab nraud povtseg muaj zog ntau dua li covalent bonds nyob rau hauv cov khaubncaws sab nraud povtseg. Yog li, thaum koj siv lub zog perpendicular rau cov khaubncaws sab nraud povtseg, cov khaubncaws sab nraud povtseg tuaj yeem xaub ib leeg yooj yim dua, ua rau qis qis.
Tam sim no, vim li cas tus Hluas lub modulus tseem ceeb rau graphite thrust bearing? Zoo, thaum lub thrust bearing nyob rau hauv lub lag luam, nws yuav tsum tau tiv thaiv axial loads. Yog tias Young's modulus qis dhau lawm, cov kabmob tuaj yeem deform ntau dhau los ntawm kev thauj khoom, uas tuaj yeem ua rau hnav tsis taus thiab ua tsis tiav. Ntawm qhov tod tes, yog tias Young's modulus siab dhau lawm, cov kabmob tuaj yeem ua rau tawg thiab tawg.
Raws li tus neeg muag khoom, peb ua tib zoo xaiv hom graphite rau peb cov thrust bearings los xyuas kom meej tias cov Young's modulus nyob rau hauv qhov kev pom zoo rau daim ntawv thov. Piv txwv li, yog tias cov kabmob yuav raug siv rau hauv daim ntawv thov siab - load, tej zaum peb yuav xaiv ib lub graphite nrog ib tug siab dua nyob rau hauv - dav hlau Young's modulus los muab zoo zog thiab tsis kam mus deformation.
Thaum koj tab tom nrhiav graphite thrust bearing, nws yog ib qho tseem ceeb uas yuav tau xav txog Young's modulus nrog rau lwm yam khoom xws li hardness, ntom, thiab thermal conductivity. Cov khoom no txhua tus ua haujlwm ua ke los txiav txim siab tag nrho kev ua haujlwm ntawm cov kabmob.
Los ntawm txoj kev, yog tias koj xav tau lwm yam khoom graphite, peb muaj qee qhov kev xaiv zoo. Mus saib peb Graphite Saw Hniav, uas yog tsim los rau kev txiav cov ntaub ntawv. Thiab rau cov nyob rau hauv lub cuab tam - ua kev lag luam, peb Pob Zeb Diamond cuab yeej yog saum toj kawg nkaus - notch. Tsis tas li ntawd, tsis txhob nco peb Graphite Waterway rau Pob Zeb Diamond Core Bits, uas yog qhov tseem ceeb rau kev ua kom txias thaum lub sij hawm drilling.
Nyob rau hauv xaus, tus Young tus modulus ntawm ib tug graphite thrust bearing yog ib qho tseem ceeb ntawm nws cov kev ua tau zoo. Raws li tus neeg muag khoom, peb muab qhov no rau hauv tus account los muab koj qhov zoo tshaj plaws - bearings zoo. Yog tias koj nyob hauv kev lag luam rau graphite thrust bearings lossis muaj lus nug txog lawv cov khoom, tsis txhob yig tiv tauj. Peb nyob ntawm no los pab koj nrhiav kev daws teeb meem zoo tshaj plaws rau koj daim ntawv thov. Txawm hais tias nws yog rau ib qhov me me - scale project lossis loj - scale kev lag luam, peb tau txais kev txawj ntse thiab cov khoom kom tau raws li koj xav tau.
Cov ntaub ntawv
"Introduction to Materials Science for Engineers" los ntawm James F. Shackelford
"Carbon Materials: Los ntawm Coal rau Nanotubes" los ntawm Michel Monthoux thiab Vladimir Kuznetsov