Uvavanyo lweRockwell Hardness lwePEEK Polymer Composites

I-PEEK (i-polyetheretherketone) yinto edityanisiweyo esebenza kakhulu eyenziwe ngokudibanisa i-PEEK resin kunye nezinto zokuqinisa ezifana ne-carbon fiber, i-glass fiber, kunye ne-ceramics. Izinto ze-PEEK ezinobunzima obuphezulu zinokumelana ngcono nokukrweleka kunye nokukrala, nto leyo eyenza ukuba zifaneleke ukuvelisa iindawo kunye nezinto ezinganyangekiyo ezifuna inkxaso enamandla aphezulu. Ubunzima obuphezulu be-PEEK buyenza ikwazi ukugcina imo yayo ingatshintshanga nasemva kokumelana noxinzelelo loomatshini kunye nokusetyenziswa ixesha elide, nto leyo evumela ukuba isetyenziswe kakhulu kwiindawo ezifana neenqwelo-moya, iimoto, kunye nonyango.

Kwizixhobo zePEEK, ubulukhuni luphawu olubalulekileyo lokukwazi kwezinto ukumelana nokuguquguquka phantsi kwamandla angaphandle. Ubulukhuni bazo bunempembelelo enkulu ekusebenzeni kwazo nasekusetyenzisweni kwazo. Ubulukhuni buhlala bulinganiswa bubunzima beRockwell, ngakumbi isikali seHRR, esifanelekileyo kwiiplastiki eziqinileyo eziphakathi. Uvavanyo lulula kwaye alubangeli monakalo mkhulu kwizinto.

Kwimigangatho yovavanyo lobunzima beRockwell yezinto ezidityanisiweyo zePeek polymer, isikali se-R (HRR) kunye nesikali se-M (HRM) zisetyenziswa kakhulu, phakathi kwazo isikali se-R sisetyenziswa kakhulu.

Kwizinto ezininzi zePeek ezingomelezwanga okanye eziqinileyo (umz., umxholo wefayibha yeglasi ≤ 30%), isikali se-R sidla ngokuba lolona khetho lukhethwayo. Oku kungenxa yokuba isikali se-R sifanelekile kwiiplastiki ezithambileyo, ubunzima bezinto zePeek ezicocekileyo buqala kwi-HRR110 ukuya kwi-HRR120, ewela ngaphakathi koluhlu lokulinganisa lwesikali se-R—okuvumela ukubonakaliswa ngokuchanekileyo kwexabiso lazo lobunzima. Ukongeza, idatha evela kwesi sikali inamandla ngakumbi kushishino xa kuvavanywa ubunzima bezinto ezinjalo.

Kwizixhobo ezidityanisiweyo zePeek eziqiniswa kakhulu (umz., umxholo wefayibha yeglasi/ifayibha yekhabhoni ≥ 30%), isikali se-M sihlala sisetyenziswa ngenxa yobunzima bazo obuphezulu. Isikali se-M sisebenzisa amandla amakhulu ovavanyo, anokunciphisa impembelelo yeefayibha eziqinisayo kwiimbobo kwaye kuphumele kwidatha yovavanyo ezinzileyo ngakumbi.

Uvavanyo lobunzima beRockwell lwee-PEEK polymer composites kufuneka luhambelane nemigangatho ye-ASTM D785 okanye ye-ISO 2039-2. Inkqubo ephambili ibandakanya ukufaka umthwalo othile nge-indenter yedayimani nokubala ixabiso lobunzima ngokusekelwe kubunzulu be-indenter. Ngexesha lenkqubo yovavanyo, kufuneka kunikwe ingqalelo ekhethekileyo ekulawuleni ukulungiswa kwesampulu kunye nendawo yovavanyo ukuqinisekisa ukuchaneka kwexabiso lesiphumo. Kufuneka kuqatshelwe izinto ezimbini ezibalulekileyo ngexesha lovavanyo:

1. Iimfuno zeSampuli: Ubukhulu buya kuba yi-≥ 6 mm, kwaye uburhabaxa bomphezulu (Ra) buya kuba yi-≤ 0.8 μm. Oku kuthintela ukugqwetheka kwedatha okubangelwa bubukhulu obungonelanga okanye umphezulu ongalinganiyo.

2. Ulawulo lweNdalo: Uvavanyo lucetyiswa ukuba lwenziwe kwindawo enobushushu obungama-23±2℃ kunye nokufuma okungama-50±5%. Ukuguquguquka kobushushu kunokuchaphazela kakhulu ukufundwa kobunzima bezinto zepolymer ezifana nePeek.

Imigangatho eyahlukeneyo inemigaqo eyahlukileyo kancinci yeenkqubo zovavanyo, ngoko ke isiseko esingezantsi ekufuneka silandelwe kufuneka sichazwe ngokucacileyo kwimisebenzi yokwenyani.

Ubunzima bezinto ezithile ezidityanisiweyo zePEEK ezidityanisiweyo bunokudlula i-HRC 50. Kubalulekile ukuvavanya iimpawu zazo zoomatshini ngokuhlola izalathisi ezifana namandla okutsalwa, amandla okugoba, kunye namandla okuchaphazeleka. Uvavanyo olusemgangathweni kufuneka lwenziwe ngokuhambelana nemigangatho yamazwe ngamazwe efana ne-ISO kunye ne-ASTM ukuqinisekisa uzinzo lomgangatho kunye nokusebenza kwazo, kunye nokuqinisekisa ukhuseleko kunye nokuthembeka kwezicelo zazo kwiindawo ezifanelekileyo.