Izinga lokushisa lokuphinda kusetshenziswe ucingo lwe-molybdenum olufakwe i-lanthanum liphakeme kunentambo ye-molybdenum emsulwa, futhi kungenxa yokuthi inani elincane le-La2O3 lingathuthukisa izakhiwo kanye nesakhiwo socingo lwe-molybdenum. Ngaphandle kwalokho, umphumela wesigaba sesibili se-La2O3 ungandisa namandla okushisa kwegumbi ucingo lwe-molybdenum futhi uthuthukise ubuthakathaka bokushisa kwegumbi ngemva kokuphinda kusetshenziswe.
Ukuqhathaniswa Kwezinga Lokushisa Lokuvuselelwa: Isakhiwo esincane sentambo ye-molybdenum emsulwa ngokusobala sandiswa ngo-900 ℃ futhi sandiswa ngo-1000 ℃. Njengoba izinga lokushisa lokuvuselelwa likhuphuka, izinhlamvu zokuvuselelwa nazo ziyanda, futhi izicubu ezine-fibrous ziyancipha kakhulu. Lapho izinga lokushisa lokuvuselelwa lifinyelela ku-1200 ℃, intambo ye-molybdenum isiphinde yasetshenziswa ngokuphelele, futhi isakhiwo sayo esincane sibonisa izinhlamvu zokuvuselelwa ezilinganayo ezifanayo. Njengoba izinga lokushisa likhuphuka, izinhlamvu zikhula ngokungalingani futhi zibonakala izinhlamvu eziqinile. Uma ziphinde zasetshenziswa ngo-1500 ℃, intambo ye-molybdenum kulula ukuyiphula, futhi isakhiwo sayo sibonisa izinhlamvu eziqinile ezifanayo. Isakhiwo sentambo yentambo ye-molybdenum efakwe i-lanthanum sandiswa ngemva kokuvuselelwa ngo-1300 ℃, futhi isimo esifana nezinyo savela emngceleni wentambo. Ngo-1400 ℃, izinhlamvu zokuvuselelwa zavela. Ku-1500 ℃, ukuthungwa kwefayibha kwehla kakhulu, futhi isakhiwo esiphinde sakhiwe sabonakala ngokusobala, futhi izinhlamvu zakhula ngokungalingani. Izinga lokushisa lokuphinda kusetshenziswe ucingo lwe-molybdenum olufakwe i-lanthanum liphakeme kunelentambo ye-molybdenum emsulwa, okubangelwa kakhulu umphumela wezinhlayiya zesigaba sesibili se-La2O3. Isigaba sesibili se-La2O3 sivimbela ukufuduka komngcele wokusanhlamvu nokukhula kokusanhlamvu, ngaleyo ndlela kwandisa izinga lokushisa lokuphinda kusetshenziswe.
Ukuqhathaniswa Kwezakhiwo Zomshini Wokushisa Kwegumbi: Ukwandiswa kwentambo ye-molybdenum emsulwa kuyanda ngokushisa kwe-annealing. Lapho izinga lokushisa le-anneal lifinyelela ku-1200 ℃, ukunwebeka kufinyelela inani eliphezulu. Ukunwebeka kwehla ngokushisa kwe-anneal kuyanda. I-Annealed ku-1500 ℃, futhi ukunwebeka kwayo cishe kufana no-zero. Ukunwebeka kwentambo ye-molybdenum e-La-doped kufana nentambo ye-molybdenum emsulwa, futhi izinga lokunwebeka lifinyelela esiphezulu uma i-annealed ku-1200 ℃. Bese ukunwebeka kwehla ngokushisa kuyanda. Okuhlukile kuphela ukuthi izinga lokunciphisa lihamba kancane. Nakuba ukunwebeka kwentambo ye-molybdenum e-lanthanum-doped kuyehliswa ngemva kokwehliswa ku-1200 ℃, ukunwebeka kuphakeme kunontambo ye-molybdenum emsulwa.
Isikhathi sokuthunyelwe: Disemba 19-2021