I-Sintered Powder

I-powder sintering ihilela ukuphakamisa izinga lokushisa le-compact eluhlaza, (ingxenye yempushana ecindezelwe), ifinyelele ezingeni elithile futhi igcinwe kulelo zinga lokushisa isikhathi esithile.Izinga lokushisa le-sintering ngokuvamile liphakathi kuka-70% no-90% wendawo encibilikayo yensimbi eyimpushana.Lokhu kuzodala izindlela zokubopha ukuthi zenzeke phakathi kwezinhlayiya zempushana ezicindezelwe ndawonye ku-compact.Ukuhlangana phakathi kokuhlanganisa okuluhlaza akunamandla futhi le ngxenye ecindezelwe engafakile ngokuvamile inobuqotho obanele besakhiwo okufanele buphathwe.Ukuhlangana okwenzeka ngesikhathi sokudubula kuqinisa kakhulu ingxenye.

Ngesikhathi se-sintering, izakhiwo zezinhlayiyana zomuntu ngamunye ziyanyamalala futhi izinto ezibonakalayo zibe yinqwaba.I-sintering evamile ngeke iqede yonke i-porosity engxenyeni, kodwa iyanciphisa i-porosity ngokuqhubekayo.Ngaphezu kokwehliswa kwevolumu, i-sintering ingase futhi ihlukanise izindawo ze-porosity evulekile exhumekile ku-compact eluhlaza.Lezi zindawo ezingazodwa ziba yi-porosity evaliwe, njengoba zihlukaniswa nemvelo yangaphandle.I-Sintering iyisici sokushiswa kwezithasiselo kumpushana ebezidingeka ezigabeni zangaphambili zokucubungula.Ukuqedwa kwezinto ezingasadingeki njengezithambisi, izibophezelo kanye nama-deflocculates, kubalulekile ukuze kugcinwe ukuhlanzeka kwempahla yomkhiqizo wokugcina.Ngaphezu kokwandisa amandla kanye nokuminyana kwezinto zengxenye, i-sintering iphinde ikhulise i-ductility, i-thermal conductivity kanye ne-electrical conductivity.Ukuncipha kuzokwenzeka ngesikhathi sokucwiliswa, kodwa kuzobalwa lapho kulawulwa izici zenqubo yokukhiqiza.

Izindlela ezibangela ukuhlangana ngesikhathi sokucwilisa zihlukahlukene futhi ziyinkimbinkimbi.Indlela eyinhloko okwenzeka ngayo ukubopha kubhekwa njengokusabalalisa, izindlela zizohluka ngokusekelwe ezicini zenqubo yokukhiqiza kanye nezici ze-powder.Ezinye izindlela ezingase zenzeke kanye nokusabalalisa ukugeleza kwepulasitiki, ukuguqulwa kabusha, ukukhula okusanhlamvu, ukuthuthwa kwempahla yesigaba soketshezi kanye nokuthuthwa kwempahla yesigaba somhwamuko.Izici ezingokomzimba zezinhlobo ezahlukene zokubopha zingase zehluke.Ukuhlanganiswa kwezinhlayiyana ngezindlela ezimbili ezihlukene kuboniswe ngezansi.Isibopho sokusabalalisa sinciphisa ibanga phakathi kwezinhlayiya, kunciphisa isikhala.Ukuthuthwa kwempahla yesigaba kunezela izinto, kuyilapho kugcina izinhlayiya ziqhelelene ngebanga elifanayo.

Izindlela zokubopha ngesikhathi se-sintering ziyinkimbinkimbi futhi zihlukile, nokho amandla amakhulu okushayela afaka lokhu kuhlanganiswa kwezinhlayiyana kubhekwa njengokunciphisa amandla ngenxa yendawo ephansi encishisiwe.Ama-powders anendawo enkulu kakhulu azoba namandla okushayela aphezulu ekuhlanganiseni nasekunciphiseni la mandla angaba khona.

Ukuhlanganiswa kwezimpushana zensimbi ezahlukene nakho kwenzeka ngesikhathi sokucwiliswa.Izinga lokushisa le-sintering kufanele lihlale liphansi kunezinga lokushisa elincibilikayo okungenani lengxenye eyodwa yempushana.Kwezinye izimo, izinga lokushisa le-sintering lingaphezu kwephoyinti lokuncibilika lenye yezinto kodwa lingaphansi kwephuzu lokuncibilika lenye.Lokhu kubizwa ngokuthi i-liquid phase sintering.I-Liquid phase sintering ingaqeda i-porosity futhi ikhiqize izingxenye ezinezakhiwo ezinhle kakhulu ezibonakalayo.