Ana yin siminti na siminti ta hanyar haɗa tungsten carbide tare da cobalt a cikin wani yanki na musamman, ana matsawa zuwa siffofi daban-daban, sa'an nan kuma Semi-sintering.Yawancin lokaci ana yin wannan tsari na ɓarna a cikin tanderun da ba a so.Ana juyar da shi a cikin tanderu mai zafi a zafin jiki na kimanin 1,300 zuwa 1,500 digiri Celsius.
mashaya mai siffa ta musamman
Sintered hard alloy forming shi ne a danna foda a cikin billet, sa'an nan a cikin sintering makera dumama zuwa wani zafin jiki (sintering zafin jiki), da kuma kula da wani lokaci (riƙe lokaci), sa'an nan sanyaya, don samun da ake bukata yi na da wuya gami kayan.
Ana iya raba tsarin siminti na simintin simintin simintin zuwa matakai na asali guda huɗu:
1: Cire forming agent da matakin farko na harbe-harbe, a wannan marhala jikin da aka danne ya canza kamar haka:
Kawar da gyare-gyaren wakili, a farkon mataki na sintering tare da Yunƙurin zafin jiki, gyare-gyaren wakili sannu a hankali bazu ko vaporize, ware da sintered jiki, a lokaci guda, gyare-gyaren wakili fiye ko žasa zuwa sintered jiki carburizing, carburizing adadin zai canza. tare da nau'in wakili na gyare-gyare, lambar da tsarin sintering daban-daban.
Ana rage oxides na foda.A yanayin zafin jiki, hydrogen na iya rage oxides na cobalt da tungsten.Idan an cire wakili mai ƙira a cikin injin da ba shi da ƙarfi, yanayin carbon-oxygen ba shi da ƙarfi.A lamba danniya tsakanin foda barbashi da aka sannu a hankali kawar, da bonding karfe foda fara farfadowa da kuma recrystallize, surface yaduwa fara faruwa, da kuma ƙarfin da block aka inganta.
2: m lokaci sintering mataki (800 ℃ – eutectic zazzabi)
A yanayin zafi kafin bayyanar lokaci na ruwa, baya ga ci gaba da tsarin da ke faruwa a matakin da ya gabata, ana ƙara ƙarfin amsawa da yaduwa, ana haɓaka kwararar filastik, kuma jikin da aka lalata ya bayyana a fili raguwa.
3: ruwa lokaci sintering mataki (eutectic zazzabi - sintering zafin jiki)
Lokacin da akwai wani lokaci na ruwa a cikin jikin da aka yi amfani da shi, raguwa ya ƙare da sauri, sa'an nan kuma ƙaddamar da crystallization yana faruwa, yana samar da ƙananan microstructure da tsarin haɗin gwiwa.
4: Matsayin sanyaya (zazzabi mai zafi - zafin jiki)
A wannan mataki, da microstructure da lokaci abun da ke ciki na gami canza tare da daban-daban sanyaya yanayi, wanda za a iya amfani da zafi jiyya na cemented carbide don inganta ta jiki da kuma inji Properties.
Lokacin aikawa: Fabrairu-10-2023
