ʻO ke koena friction o PTFE

ʻO ka pākuʻi ʻana o PTFE He Li'ili'i Loa

ʻO ke koena friction o PTFE liʻiliʻi loa, he 1/5 wale nō o ka polyethylene, he ʻano koʻikoʻi o ka ʻili fluorocarbon. Ma muli o ka haʻahaʻa haʻahaʻa loa ma waena o nā molekala kaulahao fluorine-carbon, PTFE loaʻa nā waiwai lāʻau ʻole.

PTFE mālama i nā waiwai mechanical maikaʻi ma luna o kahi ākea ākea o -196 a 260 ℃, a ʻo kekahi o nā hiʻohiʻona o nā polymers fluorocarbon ʻaʻole lākou e lilo i brittle i nā haʻahaʻa haʻahaʻa.

PTFE he kiʻekiʻe kiʻekiʻe o 2.14-2.20g/cm3, ua aneane ʻaʻole absorbent, a loaʻa kahi equilibrium wai absorption rate ma lalo o 0.01%. PTFE he polimer palupalu maʻamau a nāwaliwali, me nā ikaika hoihoi intermolecular liʻiliʻi, ʻoʻoleʻa haʻahaʻa, paʻakikī, a me ka ikaika, a e hoʻololi ʻia ma lalo o ke koʻikoʻi lōʻihi.

PTFE hiki ke kolo ma lalo o ka ukana a he plastic maʻamau me nā waiwai kahe. ʻO ke kolo o PTFE ʻokoʻa me nā koʻikoʻi compressive like ʻole, nā mahana, a me nā degere o ka crystallinity, a piʻi me ka piʻi ʻana o ka mahana. ʻO ke kolo o PTFE ʻoi aku ka liʻiliʻi ma mua o 2% inā aia ka degere o ka crystallinity ma waena o 55% a me 80%, a piʻi wikiwiki i ka wā ma lalo o 55% a ma luna o 80%.

ʻO ka waiwai mechanical maikaʻi loa o PTFE ʻo ia ka mea liʻiliʻi liʻiliʻi liʻiliʻi, aia ma waena o 0.01 a me 0.10, ka mea liʻiliʻi loa ma waena o nā mea ʻilika i loaʻa a me nā mea ʻenekinia āpau.

Ka paio o PTFE piʻi me ka hoʻonui ʻana i ka wikiwiki sliding, a ke manaʻo nei e hoʻopaʻa i ka wā e piʻi ai ka wikiwiki linear i 0.5-1.0m/s a i ʻole. ʻO ke koena kuʻekuʻe o PTFE ʻoi aku ka liʻiliʻi ma mua o ka pākuʻi hoʻoikaika kino. ʻO ka hoʻohana ʻana i kēia hiʻohiʻona i ka hana ʻana e hiki ke hōʻemi i ke kūpaʻa hoʻomaka a holo mālie ia mai ka hoʻomaka a i ka pau.

ʻO ke koena friction o PTFE ke emi nei me ka hoʻonui ʻana i ka haʻawe, a e maʻa mau i ka wā e piʻi ai ka ukana i ka 0.8 MPa a i ʻole. Ma lalo o ka māmā holo kiʻekiʻe a me ka haawe kiʻekiʻe, ka friction coefficient o PTFE emi iho ma lalo o 0.01. ʻO ke koena friction o PTFE ʻaneʻane hoʻololi ʻole ʻia mai ka wela haʻahaʻa haʻahaʻa a hiki i kona wahi hoʻoheheʻe, a piʻi nui wale ke kiʻekiʻe ka mahana o ka ʻili ma mua o ka helu heheʻe. Ma muli o ka liʻiliʻi intermolecular hoihoi ikaika, haʻahaʻa paakiki o PTFE, ua maʻalahi ia e nā mea ʻē aʻe. Eia naʻe, e like me ka lōʻihi o ka roughness ili o ka lole lole kūpono, ka lole o PTFE hiki ke hoemi nui ia.