Kodi ndi zinthu ziti zomwe zimakhudza njira ya sintering densification ya simenti ya carbide

Kuyimba kwasimenti carbidendi madzi gawo sintering, mwachitsanzo re-bonding gawo ali madzi gawo.Mabaluti oponderezedwa amatenthedwa mpaka 1350 ° C-1600 ° C mung'anjo yopanda vacuum.Kutsika kwa mzere wa billet yoponderezedwa pa sintering ndi pafupifupi 18% ndipo kuchepa kwa voliyumu kuli pafupifupi 50%.Mtengo weniweni wa shrinkage umadalira kukula kwa tinthu ta ufa ndi kapangidwe ka aloyi.

Sintering wasimenti carbidendi zovuta physicochemical ndondomeko, kuphatikizapo plasticizer kuchotsa, degassing, olimba gawo sintering, madzi gawo sintering, alloying, kachulukidwe, Kusungunuka mpweya ndi njira zina.The mbamuikha billet sintered pansi mikhalidwe yeniyeni kupanga mankhwala ndi ena mankhwala zikuchokera, kapangidwe, katundu ndi mawonekedwe ndi kukula.Izi zimasiyanasiyana malinga ndi sintering unit.

Sintering carbide vacuum sintering ndi njira yomwe sintering imachitika pansi pa 1 atm (1 atm = 101325 Pa).Sintering pansi pa vacuum mikhalidwe imachepetsa kwambiri chotchinga cha densification ndi mpweya wa adsorbed pamtunda wa ufa ndi mpweya wa pores wotsekedwa, womwe umathandizira kufalikira kwa njira ndi kachulukidwe, umapewa zomwe zimachitika pakati pa zitsulo ndi zinthu zina mumlengalenga. Sintering ndondomeko, ndipo akhoza kwambiri patsogolo wettability wa madzi viscous gawo ndi zovuta gawo, koma zingalowe sintering ayenera kulabadira kupewa evaporation imfa ya cobalt.Vacuum sintering akhoza zambiri kugawidwa mu magawo anayi, mwachitsanzo plasticizer kuchotsa siteji, chisanadze sintering siteji, kutentha sintering siteji ndi siteji yozizira.
Gawo lochotsa pulasitiki limayambira kutentha kwa chipinda ndikukwera pafupifupi 200 ° C.The mpweya adsorbed pamwamba pa ufa particles mu billet amasiyanitsidwa ndi pamwamba pa tinthu tating'onoting'ono pansi zochita za kutentha ndi kuthawa billet mosalekeza.Plasticizer mu billet amatenthedwa ndikuthawa kuchokera ku billet.Kusunga mulingo wambiri wa vacuum kumathandizira kutulutsa ndi kuthawa kwa mpweya.Mitundu yosiyanasiyana ya mapulasitiki imakhala ndi zinthu zosiyanasiyana ikatenthedwa, kotero njira yochotsera pulasitiki iyenera kupangidwa molingana ndi momwe zilili.
Njira yochotsera pulasitiki iyenera kutsimikiziridwa malinga ndi momwe mayesowo amachitikira.General plasticizer gasification kutentha ndi pansipa 550 ℃.

Pre-sintering siteji amatanthauza kutentha sintering pamaso chisanadze sintering, kuti mpweya mpweya mu particles ufa ndi mpweya kuchepetsa anachita kupanga mpweya wa carbon monoxide kusiya atolankhani billet, ngati mpweya sangakhoze kuchotsedwa pamene gawo lamadzimadzi likuwonekera, adzakhala chatsekedwa pore zotsalira mu aloyi, ngakhale pressurized sintering, n'zovuta kuthetsa.Kumbali inayi, kukhalapo kwa okosijeni kumakhudza kwambiri kunyowa kwa gawo lamadzimadzi mpaka gawo lolimba ndipo pamapeto pake kumakhudza kachulukidwe ka carbide yopangidwa ndi simenti.Pamaso pa gawo lamadzimadzi likuwonekera, liyenera kuchotsedwa mokwanira ndikugwiritsa ntchito vacuum yapamwamba kwambiri.
The sintering kutentha ndi sintering nthawi zofunika ndondomeko magawo kwa kachulukidwe wa billet, mapangidwe homogeneous dongosolo ndi kupeza zofunika katundu.Kutentha kwa sintering ndi nthawi ya sintering kumadalira kapangidwe ka aloyi, kukula kwa ufa, mphamvu yakupera ya osakaniza ndi zinthu zina, komanso zimayendetsedwa ndi dongosolo lonse la zinthu.