A matsayin sabon kayan aikin carbon, faɗaɗa graphite (EG) wani sako ne mai kama da tsutsotsi da aka samo daga flakes na graphite na halitta ta hanyar tsaka-tsaki, wankewa, bushewa da faɗaɗa zafin jiki.Bugu da ƙari, kyawawan kaddarorin graphite na halitta kamar sanyi da juriya na zafi, juriya na lalata da lubrication na kai, EG kuma yana da halaye na laushi, juriya na matsawa, adsorption, daidaitawar muhalli da muhalli, biocompatibility da juriya na radiation wanda graphite na halitta baya yi. yi.Tun farkon shekarun 1860, Brodie ya gano graphite mai fa'ida ta hanyar dumama graphite na halitta tare da reagents na sinadarai irin su sulfuric acid da nitric acid.Koyaya, aikace-aikacen sa ya fara bayan shekaru ɗari.Tun daga wannan lokacin, ƙasashe da yawa sun ci gaba da gudanar da bincike da haɓaka faɗuwar graphite tare da yin manyan ci gaban kimiyya.

Fadada graphite iya nan take fadada 150 ~ 300 sau a girma a high zafin jiki, kuma canza daga flaky zuwa vermicular, sakamakon sako-sako da tsarin, porous da lankwasa, fadada surface area, inganta surface makamashi, inganta adsorption na flake graphite, da kuma kai-chimerism tsakanin graphite vermicular, wanda ke ƙara ƙarfinsa, juriya da filastik.
Hannun ci gaba da yawa na faɗaɗa graphite sune kamar haka:

1. Fadada graphite don dalilai na musamman
Gwaje-gwaje sun nuna cewa tsutsotsin graphite suna da aikin ɗaukar raƙuman ruwa na lantarki, wanda ke sa faɗuwar graphite yana da ƙimar aikace-aikacen soja mai girma.Sojojin Amurka da sojojinmu sun gudanar da bincike na gwaji a wannan yanki.Faɗin graphite dole ne ya cika buƙatun masu zuwa: (1) ƙananan zafin faɗaɗawar farko da babban ƙarar haɓakawa;(2) Abubuwan sinadarai sun tsaya tsayin daka, kuma haɓakar haɓakar asali ba ta lalacewa bayan shekaru 5 na ajiya;(3) Fuskar graphite da aka faɗaɗa ba shi da tsaka tsaki kuma ba shi da lalata ga harsashin harsashi.

2. Granular fadada graphite
Karamin-barbashi da aka faɗaɗa graphite galibi yana nufin 300-manufa zazzage graphite tare da ƙarar faɗaɗa na 100ml/g.Ana amfani da wannan samfurin musamman don suturar wuta, kuma buƙatarsa ​​tana da girma.

3. Fadada graphite tare da babban zafin haɓaka haɓakawa na farko
The farko fadada zafin jiki na graphite fadada tare da babban farko fadada zafin jiki ne 290-300 ℃, da kuma fadada girma ne ≥ 230ml/g.Irin wannan nau'in graphite da aka faɗaɗa ana amfani da shi musamman don jinkirin wuta na robobin injiniya da roba.Jami'ar Aikin Gona ta Hebei ta sami nasarar haɓaka wannan samfurin kuma an nemi takardar izinin ƙasa.

4. Surface modified graphite
Lokacin da aka yi amfani da faɗaɗa graphite azaman abu mai hana wuta, ya haɗa da solubility na graphite da sauran abubuwan haɗin gwiwa.Saboda babban matakin ma'adinai a saman graphite, ba lipophilic ko hydrophilic ba.Sabili da haka, ya zama dole don canza yanayin graphite don magance matsalar daidaitawa tsakanin graphite da sauran abubuwan haɗin gwiwa.Wasu mutane sun ba da shawara don farar da saman graphite, wato, don rufe saman graphite tare da wani farin fim mai ƙarfi.Wannan matsala ce mai wuyar warwarewa.Ya ƙunshi sunadarai na membrane ko sinadarai na saman, wanda za'a iya samu a cikin dakin gwaje-gwaje.Akwai matsaloli a masana'antu.Irin wannan farin graphite mai faɗaɗawa ana amfani dashi galibi azaman rufin wuta.

5. Low farko fadada zafin jiki da ƙananan zafin jiki fadada graphite
Wannan nau'in graphite mai faɗaɗa yana farawa a 80-150 ℃, kuma girman girmansa ya kai 250ml/g a 600 ℃.Matsalolin da ke cikin shirya haɗuwar graphite mai faɗaɗa wannan yanayin sun ta'allaka ne a cikin: (1) zaɓar wakili mai dacewa;(2) Sarrafa da sarrafa yanayin bushewa;(3) Ƙaddamar da danshi;(4) Magance matsalolin kare muhalli.A halin yanzu, shirye-shiryen graphite mai faɗaɗa ƙananan zafin jiki har yanzu yana cikin matakin gwaji.