Kevlar - Ko te muka waihanga, ko te ingoa pūtaiao "aramid, polyparaphenylene terephthalamide." I roto i te 1965, whakawhanakehia reira te US kamupene Dupont. Nā ki tona kaha nui (3620 MPa), he āhuatanga tiaki ahurei, te marama taimaha me te kōngohe, kua whakamahia whānuitia Kevlar i roto i ngā mara. taea ki te tu atu pānga wā roa-a ētahi atu kawenga tēnei rauemi he, e kore te reira e hauā.
1970-x haumaru, me te pono i roto i te tino tikanga Kevlar hoatu ki production arumoni. Heoi, i roto i te timatanga i hangaia ai mo te ngā o potae motokā, i roto i te tikanga ki te whakapiki ake i ō rātou kaha, me te whakaiti i taimaha. Na tonu te mahi angitu me te whakapakaritia whatu muka, me te parahi taura ki te ārai ratou whaturama me kurut papanga whakauru - ki te hoatu ātete ki te tapahi me te awe auaha. I roto i ngā, kua meinga taua papanga purpuru tiaki i roto i te kakahu o kaitäkaro me potae hōia me karapu Kevlar. Kua whāngai mano o nga whenua maha i roto i te ao, me te Kevlar, te whakamahi i ona āhuatanga aunoa, Kei te whakamahia mātātoa i roto i te hōia ratonga taputapu me te haumarutanga. He tauira pirimia o taua whakamahinga he matā tohu koti.
hua katoa he Kevlar i resistance wera nui, me te ātete ki te waikawa me kawakore. otinga pai, he karapu papanga ki Kevlar: i roto i te whakangao mōrearea, e pā nei te ki te kaha o motu karaihe ranei pepa whakarewa, whakapā pūmau ki ngā whero-wera (ki runga, ki te 100 ° C), i roto i te ahumahi kai, engineering aunoa, transportation o karaihe, me ētahi atu momo o ratou mahi koha. karapu Kevlar noa hangaia ki te tiaki i nga ringa i motu i roto i, hei tauira, papatipu ika whakairo, heihei, kai, hua me huawhenua. He ratou Kōmāmā me te hāneanea - i roto i o ratou ringa, "manawa", ngāwari nui ki te pupuri i te tūtohutanga o nga ringa, me te tuku ki te mahi ki ngā taipitopito iti, me te whakarato ringa pai - mākū (hinu), me te maroke. E hangaia ēnei karapu, kahore he tui, me te i roto i te rerekē te rahi, kia taea te tiki te katoa te rongoa ohie. Ka taea te whakamahi karapu Kevlar hei noa karapu kore anake, engari ano hoki i rite te ararewa, a rite hangarau. e kore e ratou rapua e tiaki motuhake. Horoi e taea e ratou i 40 ° C ki te kūpapa hopiwē, me te hiahia ki te maroke i te pāmahana rūma. Ka taea e koe te tango i a ratou ki te kaihoroi maroke ki te hiahia koe. I muri i te whakamahi toutou me horoinga karapu (pūāhuru) Kevlar pupuri ratou āhuatanga tiaki, āhua me te ahua, a ko te kupu, ko te nui nui ratou roa.
Well kï i roto i ngā mahi Kevlar te whakamahia i roto i te hākinakina. Skiers, racers, racers motopaika me kaitākaro peisipolo hari ki te whakamahi i karapu Kevlar. Ka taea e ratou pakeke, pānga resistance me te wera ātete whakaiti i te maha o wharanga ara karo ratou ranei.
Ko Kevlar me te painga whakakorekore kua etahi āhuatanga. I pāmahana feunga teitei (430-480 ° C) decomposes reira, engari i te pāmahana ngaro nui atu i 150 ° C tona kaha. Te auau whakawera me roanga, o te akoranga, te tākaro hoki i te tūranga. Ko te kupu, ngaro i runga i 70 haora o te te rongo ki te pāmahana o e pā ana ki 250 ° karapu Kevlar C 50% o tona kaha. I pāmahana iti (-190 ° C), i runga i te anga ke, kua tonu te kaha me te elasticity. Otiia i roto i te ora ia rā e kore e taea ki te hanga i tētahi taiao e pai ki te whakangaro i te hanganga rāpoi o Kevlar.