Cov khoom siv bearing yog tus cwj pwm los ntawm kev sib txhuam qis, kev qaug zog txaus, kev ua haujlwm zoo - hauv cov khoom, thiab zoo corrosion kuj. Feem ntau siv cov kabmob muaj xws li cov kabmob alloys (Babbitt hlau), tooj liab alloys, hmoov metallurgy, grey cam khwb cia hlau, thiab hnav- cam khwb cia hlau.
Tsis yog-cov khoom siv roj lubricated feem ntau poob rau hauv peb pawg: polymers, carbon graphite, thiab tshwj xeeb ceramics.
Polymers
Polymers, tseem hu ua organic polymer cov ntaub ntawv lossis engineering plastics, feem ntau suav nrog phenolic resins, nylon, thiab polytetrafluoroethylene (PTFE). Tsis yog - lubricated bearings ua los ntawm cov yas (xws li PTFE) yog resistant rau cov acids muaj zog thiab alkalis tsis muaj zog, thiab pom zoo embedded, txo kev sib txhuam, thiab hnav tsis kam. PTFE nplooj ntawv yog stamped rau hauv daim di ncauj ntsaws ruaj ruaj, bearing shells, piston rings, thiab gaskets siv nyob rau hauv txoj siv conveyors, ntaus ntawv, tshuab xaws, ntaub ntawv players, dej twj, textile machinery, thiab ua liaj ua teb machinery.
Polymers yog lub teeb yuag, rwb thaiv tsev, kev sib txhuam-txo, hnav- tiv taus, tus kheej- lubricating, corrosion- tiv taus, muaj cov txheej txheem molding yooj yim, thiab kev ua haujlwm siab. Piv nrog rau cov khoom siv hlau, lawv cov khoom tribological yog qhov nkag siab zoo rau qhov ntsuas kub thiab av noo, thiab lawv cov viscoelasticity cuam tshuam loj heev, ua rau muaj kev cuam tshuam loj dua ntawm cov kabmob thiab cov ntawv sau. Tsis tas li ntawd, lawv lub zog tsis muaj zog, tsis muaj elastic modulus, thiab cov roj nplua nyeem tsis zoo txwv kev khiav hauj lwm ceev thiab siab ntawm cov kabmob bush.
Cov pa roj carbon-Graphite
Cov pa roj carbon-graphite bearing bushes tuaj yeem siv rau hauv qhov chaw hnyav. Qhov siab dua cov ntsiab lus graphite, cov khoom siv softer thiab qis dua qhov coefficient ntawm kev sib txhuam.
Cov pa roj carbon -graphite feem ntau nthuav tawm cov hluav taws xob zoo, tiv thaiv tshav kub, hnav tsis kam, tus kheej -lubrication, zoo siab - kub stability, muaj zog tshuaj corrosion kuj, thermal conductivity ntau dua li polymers, thiab ib tug tsawg coefficient ntawm linear expansion. Nyob rau hauv huab cua thiab chav tsev kub, cov coefficient ntawm kev sib txhuam thiab hnav tus nqi nrog chrome-plated nto yog tsawg heev. Nws tus kheej -lubricating thiab kev sib txhuam- txo cov khoom nyob ntawm seb cov dej vapor adsorbed, tab sis nws poob nws cov khoom lubricating ntawm cov av qis heev. Siv cov hnav khaub ncaws- tiv taus txheej tuaj yeem txhim kho qhov hnav tsis kam ntawm cov pa roj carbon -graphite. Cov pa roj carbon-graphite kuj tseem siv tau los ua dej-cov khoom siv roj hmab roj hmab.
Graphite tuaj yeem siv tsis tau tsuas yog ua cov roj nplua nyeem thiab ntxiv rau cov ntaub ntawv xws li resins, hlau, thiab ceramics kom lawv cov kev sib txhuam ntau dua -txo cov khoom, tab sis kuj ncaj qha raws li cov khoom sib txhuam. Piv txwv xws li bearings, siab -kub zawv zawg bearings, seals, piston rings, thiab scrapers rau roj-sensitive applications xws li papermaking, woodworking, textiles, thiab zaub mov ua. Lub cim rau "chav kawm" ntawm carbon graphite cov ntaub ntawv siv nyob rau hauv mechanical engineering yog M, thiab muaj plaub series: carbon graphite cov ntaub ntawv, electrographite cov ntaub ntawv, resin- cov ntaub ntawv carbon composite, thiab metallic graphite cov ntaub ntawv.
Ceramics
Ceramics tsis yog-cov khoom siv hlau ua los ntawm cov khoom siv tsis zoo uas tsis yog-nws yog xim hlau ntuj lossis cov khoom siv dag zog los ntawm crushing, shaping, thiab siab -kub sintering. Lawv muaj ntau inorganic non-hlau me me crystals thiab ib theem glassy. Cov tsoos ceramics yog tsim los ntawm inorganic non-hlau tej yam ntuj tso minerals xws li av nplaum, feldspar, thiab quartz; tshwj xeeb ceramics yog tsim los ntawm cov khoom siv dag zog. Mechanical engineering ceramics feem ntau yog tshwj xeeb ceramics ua los ntawm cov khoom siv dag zog xws li alumina, magnesium oxide, zirconium oxide, txhuas oxide, titanium oxide, silicon carbide, boron carbide, silicon nitride, thiab boron nitride.
Cov khoom ntawm ceramics feem ntau txiav txim siab los ntawm lawv cov microstructure, suav nrog cov nplej loj thiab kev faib tawm, muaj pes tsawg leeg thiab cov ntsiab lus ntawm lub khob iav, thiab qhov xwm txheej, cov ntsiab lus, thiab kev faib tawm ntawm impurities. Qhov no microstructure, nyob rau hauv lem, yog txiav txim los ntawm raw cov ntaub ntawv, muaj pes tsawg leeg, thiab manufacturing txheej txheem. Cov yam ntxwv ntawm cov ceramics muaj xws li siab hardness thiab compressive zog, kub tsis kam, hnav tsis kam, oxidation tsis kam, zoo corrosion kuj, brittleness, tsis zoo cuam tshuam, thiab tsis muaj ductility.
Ceramics yog cov khoom siv tshiab rau cov kabmob uas tsis muaj kabmob, tshwj xeeb tshaj yog SiC thiab Si3N4, uas muaj lub zog zoo heev, ua haujlwm kub, tiv thaiv corrosion, thiab tribological khoom.