Kufotokozera Mwatsatanetsatane wa Isostatic Pressing Graphite (2)

1.4 Kupera kwachiwiri

Phalalo amaphwanyidwa, kuphwanyidwa, ndi kusefa mu tinthu ting’onoting’ono tokwana makumi kapena mazana a micrometer kukula kwake tisanasakanizidwe mofanana. Amagwiritsidwa ntchito ngati chinthu chopondereza, chomwe chimatchedwa kukakamiza ufa. Chida chopera chachiwiri nthawi zambiri chimagwiritsa ntchito mphero yowongoka kapena mphero.

1.5 Kupanga

Mosiyana extrusion wamba ndi akamaumba,isostatic kukanikiza graphiteimapangidwa pogwiritsa ntchito ukadaulo wozizira wa isostatic (Chithunzi 2). Lembani ufa wazinthu zopangira mu nkhungu ya rabala, ndikuphatikiza ufawo kudzera pamagetsi othamanga kwambiri amagetsi. Mukasindikiza, sungani tinthu tating'ono ta ufa kuti muthe mpweya pakati pawo. Ikani mu chidebe choponderezedwa kwambiri chomwe chili ndi zinthu zamadzimadzi monga madzi kapena mafuta, sungani mpaka 100-200MPa, ndikuchikanikiza mu chinthu cha cylindrical kapena rectangular.

Malinga ndi mfundo ya Pascal, kukakamizidwa kumagwiritsidwa ntchito pa nkhungu ya rabara kudzera mu sing'anga yamadzi monga madzi, ndipo kupanikizika kumakhala kofanana mbali zonse. Mwanjira iyi, tinthu tating'onoting'ono ta ufa sizimayendetsedwa munjira yodzaza mu nkhungu, koma zimapanikizidwa mosagwirizana. Choncho, ngakhale graphite ndi anisotropic mu crystallographic katundu, wonse, isostatic kukanikiza graphite ndi isotropic. Zopangidwazo sizingokhala ndi mawonekedwe a cylindrical ndi amakona anayi, komanso mawonekedwe a cylindrical ndi crucible.

Makina osindikizira a isostatic amagwiritsidwa ntchito kwambiri pamakampani opanga zitsulo. Chifukwa cha kufunikira kwa mafakitale apamwamba monga zakuthambo, mafakitale a nyukiliya, ma aloyi olimba, ndi ma electromagnetic apamwamba kwambiri, chitukuko cha ukadaulo wa isostatic pressing ndichachangu kwambiri, ndipo chimatha kupanga makina ozizira a isostatic omwe ali ndi silinda yogwira ntchito. m'mimba mwake mkati 3000mm, kutalika kwa 5000mm, ndi kuthamanga pazipita ntchito 600MPa. Pakali pano, mfundo pazipita makina ozizira isostatic kukanikiza ntchito mu makampani carbon popanga isostatic kukanikiza graphite ndi Φ 2150mm × 4700mm, ndi pazipita ntchito kuthamanga kwa 180MPa.

1.6 Kuphika

Panthawi yowotcha, zovuta za mankhwala zimachitika pakati pa aggregate ndi binder, zomwe zimapangitsa kuti binder iwonongeke ndi kumasula zinthu zambiri zosasunthika, komanso ikukumana ndi condensation reaction. M'malo otenthetsera kutentha kwanthawi yayitali, zinthu zosaphika zimakula chifukwa cha kutentha, ndipo pakutentha kotsatira, voliyumuyo imachepa chifukwa cha condensation reaction.

Kukula kwa voliyumu yaiwisi yaiwisi, kumakhala kovuta kwambiri kumasula zinthu zosasinthika, komanso pamwamba ndi mkati mwazopangira zomwe zimakhala ndi kusiyana kwa kutentha, kufalikira kwamafuta osagwirizana ndi kutsika, komwe kungayambitse ming'alu yachipangiricho.

Chifukwa cha mawonekedwe ake abwino, isostatic kukanikiza graphite kumafuna makamaka pang'onopang'ono Kuwotcha ndondomeko, ndi kutentha mkati ng'anjo kuyenera kukhala yunifolomu, makamaka pa kutentha siteji kumene phula volatiles mofulumira kutulutsidwa. Kutentha kuyenera kuchitidwa mosamala, ndi kutentha kosapitirira 1 ℃/h ndi kusiyana kwa kutentha mkati mwa ng'anjo yosachepera 20 ℃. Izi zimatenga pafupifupi miyezi 1-2.

1.7 Kuchotsa mimba

Pakuwotcha, chinthu chosasunthika cha phula la malasha chimatulutsidwa. Ma pores abwino amasiyidwa muzinthu panthawi yotulutsa mpweya komanso kutsika kwa voliyumu, pafupifupi zonse zomwe zimakhala zotseguka.

Pofuna kupititsa patsogolo kachulukidwe ka voliyumu, mphamvu zamakina, ma conductivity, matenthedwe matenthedwe, komanso kukana kwa mankhwala, njira yolumikizira ingagwiritsidwe ntchito, yomwe imaphatikizapo kuyika phula la malasha mkati mwa chinthucho kudzera poyera.

Chogulitsiracho chiyenera kutenthedwa kaye, kenako ndikuchipukuta ndi kuchotsedwa mu thanki ya impregnation. Kenako, phula losungunuka la malasha limawonjezedwa ku thanki ya impregnation ndikukanikizidwa kuti phula loyamwitsa lilowe mkati mwa mankhwalawa. Nthawi zambiri, isostatic kukanikiza graphite amadutsa mikombero angapo impregnation Kuwotcha.

1.8 Kujambula zithunzi

Kutenthetsa mankhwala calcined pafupifupi 3000 ℃, kukonza lattice maatomu carbon mwadongosolo, ndi malizitsani kusintha kuchokera carbon kuti graphite, amene amatchedwa graphitization.

Njira za graphitization zikuphatikizapo njira ya Acheson, njira yolumikizira mndandanda wamkati wamkati, njira yopangira ma frequency apamwamba, ndi zina. Njira yanthawi zonse ya Acheson imatenga pafupifupi miyezi 1-1.5 kuti katundu azinyamulidwa ndikutulutsidwa mung'anjo. Ng'anjo iliyonse imatha kunyamula matani angapo mpaka matani ambiri azinthu zokazinga.