Silicon carbide (SiC) yumbu fodayana da abũbuwan amfãni daga high zafin jiki ƙarfi, mai kyau hadawan abu da iskar shaka juriya, high lalacewa juriya da thermal kwanciyar hankali, kananan thermal fadada coefficient, high thermal conductivity, mai kyau sinadaran kwanciyar hankali, da dai sauransu Saboda haka, ana amfani da sau da yawa a cikin kera na konewa dakunan, high zafin jiki shaye. na'urori, faci masu jure zafin jiki, abubuwan injin jirgin sama, tasoshin ɗaukar sinadarai, bututun musayar zafi da sauran kayan aikin injiniya a ƙarƙashin yanayi mai tsauri, kuma kayan aikin injiniya ne na ci gaba da ake amfani da su sosai.Ba wai kawai yana taka muhimmiyar rawa a cikin manyan fasahohin da ake ci gaba ba (kamar injunan yumbu, jirage masu saukar ungulu, da sauransu), amma kuma yana da faffadan kasuwa da filayen aikace-aikacen da za a haɓaka a cikin makamashi na yanzu, ƙarfe, injina, kayan gini. , masana'antar sinadarai da sauran fannoni.

Hanyoyin shiri nasiliki carbide fodaZa a iya raba kashi uku cikin rukuni uku: Hanyoyi mai ƙarfi, Hanyar Hanyar ruwa da Hanyar Gas.

1. Hanyar lokaci mai ƙarfi

Hanyar lokaci mai ƙarfi ya haɗa da hanyar rage yawan carbon da kuma hanyar amsawar kai tsaye ta silicon carbon.Hannun rage yawan kuzari kuma sun haɗa da hanyar Acheson, hanyar tanderu a tsaye da kuma hanyar sauya zafin jiki.Silicon carbide fodaAn fara shirya shirye-shiryen ta hanyar hanyar Acheson, ta yin amfani da coke don rage silicon dioxide a babban zafin jiki (kimanin 2400 ℃), amma foda da aka samu ta wannan hanyar yana da girman girman barbashi (> 1mm), yana cinye makamashi mai yawa, kuma tsarin shine. rikitarwa.A cikin 1980s, sababbin kayan aiki don haɗawa da β-SiC foda, irin su tanderun tsaye da kuma mai canza zafin jiki, sun bayyana.Kamar yadda tasiri da kuma musamman polymerization tsakanin obin na lantarki da sinadarai a cikin m aka sannu a hankali bayyana, da fasaha na synthesizing sic foda ta microwave dumama ya zama ƙara girma.Hanyar amsawar kai tsaye ta silicon carbon kuma ta haɗa da haɓaka haɓakar zafin jiki mai kai tsaye (SHS) da hanyar haɗa kayan aikin injiniya.Hanyar haɗin SHS yana amfani da halayen exothermic tsakanin SiO2 da Mg don gyara rashin zafi.Thesiliki carbide fodasamu ta wannan hanya yana da high tsarki da kuma kananan barbashi size, amma da Mg a cikin samfurin bukatar a cire ta m matakai kamar pickling.

2 ruwa lokaci hanya

Hanyar lokaci na ruwa ya ƙunshi hanyar sol-gel da hanyar bazuwar zafin jiki na polymer.Hanyar Sol-gel shine hanyar shirya gel mai ɗauke da Si da C ta hanyar tsarin sol-gel daidai, sannan pyrolysis da rage yawan zafin jiki na carbothermal don samun silicon carbide.Babban zafin jiki bazuwar kwayoyin polymer shine fasaha mai tasiri don shirye-shiryen silicon carbide: daya shine don zafi gel polysiloxane, bazuwar amsawa don saki ƙananan monomers, kuma a ƙarshe ya samar da SiO2 da C, sa'an nan kuma ta hanyar rage ƙwayar carbon don samar da SiC foda;Ɗayan kuma shine a yi zafi da polysilane ko polycarbosilane don saki ƙananan monomers don samar da kwarangwal, kuma a ƙarshe ya zama.siliki carbide foda.

3 Hanyar iskar gas

A halin yanzu, iskar gas lokaci kira nasiliki carbideyumbu ultrafine foda yafi amfani da iskar gas lokaci (CVD), Plasma Induced CVD, Laser Induced CVD da sauran fasaha don lalata kwayoyin halitta a babban zafin jiki.The samu foda yana da abũbuwan amfãni daga high tsarki, kananan barbashi size, m barbashi agglomeration da sauki iko da aka gyara.Yana da ingantacciyar hanyar ci gaba a halin yanzu, amma tare da farashi mai yawa da ƙananan yawan amfanin ƙasa, ba shi da sauƙi don cimma yawan samarwa, kuma ya fi dacewa don yin kayan aikin dakin gwaje-gwaje da samfurori tare da buƙatu na musamman.

A halin yanzu, dasiliki carbide fodaAna amfani da shi yafi submicron ko ma nano matakin foda, saboda girman ƙwayar foda ƙananan ƙananan aiki ne, babban aiki, don haka babban matsala shine cewa foda yana da sauƙi don samar da agglomeration, wajibi ne a gyara fuskar foda don hana ko hanawa. na sakandare agglomeration na foda.A halin yanzu, da hanyoyin da watsawa na SiC foda yafi hada da wadannan Categories: high-makamashi surface gyara, wanka, dispersant magani na foda, inorganic shafi gyare-gyare, Organic shafi gyare-gyare.