Cemented carbides inogadzirwa nekusanganisa tungsten carbide necobalt mune imwe chiyero, ichidzvanya kuita akasiyana maumbirwo, uyezve semi-sintering.Iyi sintering process inowanzoitwa muchoto chevacuum.Inopiswa muchoto chevacuum patembiricha ingangoita 1,300 kusvika 1,500 degrees Celsius.
Special-shaped bar
Sintered hard alloy forming ndeyekudzvanya poda mubillet, wozopinda muchoto chekupisa kune imwe tembiricha (sintering tembiricha), uye kuchengetedza imwe nguva (kubata nguva), uyezve kutonhora pasi, kuitira kuti uwane iyo inodiwa kuita. iyo yakaoma alloy zvinhu.
Iyo cemented carbide sintering process inogona kukamurwa kuita matanho mana ekutanga:
1: Kubviswa kweanoumba agent uye pre-firing nhanho, mune ino nhanho iyo sintered body inoshanduka seinotevera:
Kubviswa kwemugadziri wekuumba, padanho rekutanga rekunyura nekukwira kwekushisa, mumiriri wekuumba zvishoma nezvishoma unoora kana kunyungudika, usabvisa muviri wakanyungudika, panguva imwe chete, mumiriri wekuumba zvakanyanya kana zvishoma kune sintered body carburizing, carburizing huwandu huchachinja. nemhando yekuumba agent, nhamba uye yakasiyana sintering process.
Maokisi epamusoro ehupfu anoderedzwa.Pakupisa tembiricha, hydrogen inogona kuderedza maokisi ecobalt uye tungsten.Kana iyo inoumba agent ikabviswa muvacuum uye yakanyungudutswa, iyo carbon-oxygen reaction haina kusimba.Kushushikana kwekubatana pakati pehupfu hupfu hunobviswa zvishoma nezvishoma, iyo yekubatanidza simbi poda inotanga kupora uye kudzokorora, kupararira kwepamusoro kunotanga kuitika, uye kusimba kwechivharo kunovandudzwa.
2: yakasimba chikamu sintering nhanho (800 ℃ - eutectic tembiricha)
Pakupisa kusati kwaonekwa kwechikamu chemvura, mukuwedzera pakuenderera mberi kwechiitiko chakaitika munhanho yapfuura, kuita kwakasimba uye kupararira kunowedzerwa, kuyerera kwepurasitiki kunokwidziridzwa, uye muviri wakanyungudutswa unoratidzika kuderera kuri pachena.
3: liquid phase sintering stage (eutectic tembiricha - sintering tembiricha)
Kana paine chikamu chemvura mumuviri wakanyoroveswa, iyo shrinkage inokurumidza kupedzwa, uye ipapo shanduko yekristalllization inoitika, ichigadzira iyo yakakosha microstructure uye chimiro cheiyo alloy.
4: kutonhora nhanho (sintering tembiricha - kamuri tembiricha)
Panguva ino, iyo microstructure uye chikamu chekuumbwa kweiyo alloy inoshanduka neyakasiyana kutonhora mamiriro, ayo anogona kushandiswa kupisa kurapwa kwecemented carbide kuvandudza ayo emuviri uye mekiniki zvimiro.
Nguva yekutumira: Feb-10-2023
