izindaba

Ekwakhiweni kokuvikelwa kokushisa kwemikhiqizo yezindiza, ezintweni ezidinga ukujiya okukhulu, ezine-geometri eziyinkimbinkimbi, noma ezisengozini yokuqhekeka kwengcindezi, izinto ezihlanganisiwe zivame ukusetshenziswa esikhundleni sezingubo zokuvikela ukushisa zendabuko. Ngaphezu kwalokho, izakhiwo zokuvikela ukushisa ezihlanganisiwe zinikeza izinketho zokwenza izinto ezihlukahlukene: zingakhiwa ngokushesha ngqo endaweni ethile yokuvikelwa kokushisa, noma zingaboshwa endaweni kusetshenziswa imikhono yokuvikela ukushisa ehlanganisiwe eyenziwe ngaphambilini, ngaleyo ndlela zinikeze izinzuzo ezihlukile zenqubo yokulungiselela ephumelelayo nelula. Njengamanje, izinhlanganisela ze-phenolic glass fiber zisetshenziswa kabanzi ezakhiweni zokuvikela ukushisa ngenxa yezinzuzo zazo eziningi, okuhlanganisa ukuzinza kwesakhiwo, ukumelana nokushisa okuphezulu, isivuno esikhulu se-char, izinga eliphansi lokukhipha, amandla aphezulu omshini, kanye nokuqina okuhle kakhulu komthelela.

Izinhlanganisela ze-phenolic glass fiberZinamandla amakhulu okusetshenziswa kabanzi emkhakheni wezindiza. Indlela yazo yokuvikela ukushisa ihilela ukusebenzisana okusebenzisanayo kwezinqubo eziningi zokuvikela, okuhlanganisa ukuvinjelwa kokuqhuba ukushisa, i-endothermic pyrolysis, ukufakelwa kokushisa okuhlinzekwa yi-char layer, kanye nokusekelwa kwesakhiwo. Leli phepha lizohlaziya ngokuyinhloko indlela yokuvikela ukushisa kusukela emibonweni yokuvimbela ukuqhubela ukushisa, i-endothermic pyrolysis, kanye nokufakelwa kokushisa okuhlinzekwa yi-char layer.

1. Ukuvinjelwa Kokuqhutshwa Kokushisa

Ngaphakathi kwezingxenye ze-phenolic glass fiber, i-phenolic resin matrix ngokwayo inomoya wokushisa ophansi ngokwemvelo, osiza ekubambezeleni kakhulu ukuhanjiswa kokushisa kwangaphandle. Lapho izinto ezihlanganisiwe zitholwa ezindaweni zokushisa okuphezulu ezihlangana nazo ngesikhathi sokundiza, ukushisa kuqala kusakazeka ngaphakathi kusuka ebusweni obungaphandle. Kodwa-ke, isakhiwo se-macromolecular chain esihambisana ne-phenolic resin matrix sivimbela izindlela zokuhanjiswa kokushisa, ngaleyo ndlela kubangele ukwehla okuphawulekayo kwesilinganiso sokudluliselwa kokushisa. Ngesikhathi esifanayo, ukuba khona kwezintambo zeglasi ngaphakathi kwenhlanganisela kushintsha kakhulu izindlela zokuhanjiswa kokushisa kwangaphakathi. Ngaphezu kwalokho, ukuxhumana phakathi kwezintambo zeglasi ne-phenolic resin kubonisa ukumelana okuphezulu kokushisa; ngenxa yalokho, ukushisa kuhlangana nokuphazamiseka okwengeziwe njengoba kudlula kulesi sixhumanisi, kuvimbela kakhulu inqubo yokuhanjiswa kokushisa futhi kwehlise ngempumelelo izinga lokunyuka kokushisa ngaphakathi kwezinto ezihlanganisiwe.

2. I-Endothermic Pyrolysis

Uma ivezwa ezindaweni zangaphandle ezishisa kakhulu, i-phenolic resin ibhekana nokusabela okuqhubekayo kwe-pyrolysis. Le nqubo ye-pyrolysis iyindlela yokusabela ye-endothermic: lapho imunca amandla okushisa, izibopho zamakhemikhali ngaphakathi kwama-molecule e-phenolic resin ziyaqhuma, okubangela ukuthi izinto zibole zibe amagesi amancane-molecule kanye nezinsalela ze-carbonaceous. Le nqubo isebenzisa ngempumelelo amandla okushisa adluliselwa kusuka endaweni yangaphandle kuya ebusweni be-composite, ngaleyo ndlela yehlisa izinga lokushisa lobuso bezinto ezihlanganisiwe ngasikhathi sinye. 3. Ukufakwa Kokushisa Nge-Char Layer

Njengoba ukusabela kwe-pyrolysis kuqhubeka, ungqimba lwe-char lwakha kancane kancane ebusweni be-i-phenolic resin composite. Le ngqimba ye-char inesakhiwo esinezimbobo, lapho izimbobo zayo zigcwele amagesi abonisa ukuhanjiswa kokushisa okuphansi kakhulu; lesi sici sithuthukisa kakhulu amakhono okushisa e-composite. Ngesikhathi esifanayo, ungqimba lwe-char luveza ukuthungwa kwendawo eqinile okukwazi ukumelana nezingcindezi ezithile ze-aerodynamic kanye nemithwalo yemishini, ngaleyo ndlela kuvikele izinto ezingaphansi ezingashiswanga emiphumeleni yokukhuhla kanye nokuguguleka kokugeleza kwegesi okushisa okuphezulu. Ingqimba ye-char ekhiqizwa endaweni ehlanganisiwe ayigcini nje ngokusebenza njengokuvimbela kodwa futhi, ngezinga elithile, inciphisa ukulahleka kwesisindo ku-composite, ngaleyo ndlela yandisa impilo yenkonzo yesakhiwo sokuvikela ukushisa.