Ndi magawo anayi ati mu njira ya vacuum sintering ya Cemented Carbid

Carbide ya simentivacuum sintering ndi njira yomwe sintering imachitidwa ndi kuthamanga pansi pa mphamvu ya mumlengalenga.Izi zikuphatikizapo kuchotsa plasticizer, degassing, solid phase sintering, liquid phase sintering, alloying, densification, ndi disolution mpweya.Tiyeni tiwone njira zazikulu zinayi zopangira simenti ya carbide vacuum sintering:

① Gawo lochotsa pulasitiki

Gawo lochotsa pulasitiki limayambira kutentha kwa chipinda ndikukwera pafupifupi 200 ° C.The mpweya adsorbed pamwamba pa ufa particles mu billet amasiyanitsidwa ndi pamwamba pa particles ndi kutentha ndi kuthawa billet mosalekeza.Pulasitiki mu billet akutenthedwa kuti atuluke mu billet.Kusunga mulingo wambiri wa vacuum kumathandizira kutulutsa ndi kuthawa kwa mpweya.Mitundu yosiyanasiyana ya mapulasitiki amasinthidwa ndi kutentha kwa magwiridwe antchito amasiyanasiyana, kukula kwa njira yochotsera pulasitiki kuyenera kutsimikiziridwa malinga ndi momwe mayesowo amachitikira.General plasticizer gasification kutentha ndi pansipa 550 ℃.

② Gawo lothamangitsidwa

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 otsekedwa pore zotsalira mu aloyi, ngakhale pressurized sintering, n'zovuta kuthetsa.Kumbali inayi, kukhalapo kwa okosijeni kudzakhudza kwambiri kunyowa kwa gawo lamadzimadzi mpaka gawo lolimba ndipo pamapeto pake kukhudza kachulukidwe kake.simenti carbide.Pamaso pa gawo lamadzimadzi likuwonekera, liyenera kuchotsedwa mokwanira ndikugwiritsa ntchito vacuum yapamwamba kwambiri.

③ High kutentha sintering siteji

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.

④gawo lozizirira

Gawo loziziritsa ndi pomwe kuzizira kumakhudza kapangidwe kake ndi kapangidwe ka gawo lolumikizana la alloy ndikupanga kupsinjika kwamkati.Kuzizira kumayenera kukhala koyendetsedwa bwino.Sintering otentha isostatic kukanikiza ndi latsopano sintering njira, amatchedwanso otsika-anzanu sintering, imene mankhwala ndi pressurized ndi kupanikizika kwina kwa mpweya kulimbikitsa kachulukidwe pansi chikhalidwe kuti degassing watha, pores pamwamba pa mbamuikha billet. zatsekedwa, ndi binder gawo amakhala madzi.