A matsayin muhimmin ɓangare na kayan aikin injiniya da kayan aiki, kayan yumbu na ci gaba suna da fa'idodin aikace-aikace a cikin sabon makamashi, kayan lantarki na sadarwa, semiconductor, sararin samaniya da sauran filayen masana'antu. Duk da haka, saboda yumbu foda shine mafi yawa ionic bond ko covalent bond fili, da gargajiya sintering tsari don shirya mkayan yumburayana buƙatar mafi girma sintering zafin jiki da kuma tsawon riƙe lokaci, wanda babu makawa take kaiwa ga hatsi coarsening da porosity saura, sa'an nan kuma rinjayar da kaddarorin.yumbu allura gyare-gyare. Domin ragewakarfe sinteringzafin jiki, rage lokacin ɓacin rai, inganta haɓakar ƙima da kaddarorin kayan aiki, masu bincike sun haɓaka sabbin fasahohi iri-iri.
Spark plasma sintering (SPS)
Fasahar SPS wani sabon nau'in fasaha ne na saurin rarrabuwar kawuna wanda ya damu sosai da kuma nazari a duniyar ilimi. FIG. 1 yana nuna ƙa'idodin aikinsa.
Fasahar SPS ta fara gabatar da dc pulse current a cikinsintering tsari. Mai shiga yana aiki azaman mai ɗaukar hoto don na yanzu don wucewa yayin da ake matsa lamba akan kayan. Ba kamar na gargajiya fasahar sintering, wanda yawanci amfani da radiant dumama jiki, SPS yana amfani da thermal sakamakon wani babban lantarki halin yanzu wucewa ta wani mold ko gudanar da samfur don dumama kayan. Don insulating samfurori, graphite tare da kyawawan halayen lantarki yawanci ana amfani dashi azaman kayan ƙira, kuma ana amfani da zafin juriya na ƙirar don sa samfurin ya tashi da sauri. Don samfurori masu sarrafawa, ana iya amfani da ƙwanƙwasa mai rufewa don dumama halin yanzu ta hanyar samfurin. Adadin dumama zai iya kaiwa 1000 ℃ / min. Lokacin da samfurin zafin jiki ya kai ƙimar da aka saita, ana iya kammala sintering bayan ɗan gajeren lokaci na adana zafi.
Fasahar SPS tana da fa'idodin ƙarancin zafin jiki, ɗan gajeren lokacin riƙewa, saurin dumama, matsi mai daidaitacce, da haɗaɗɗen fage da yawa (lantarki-kanikanci-thermal).
Ƙaddamar da Flash (FS)
An fara bayar da rahoton fasahar FS a cikin 2010 ta Cologna et al daga Jami'ar Colorado, dangane da nazarin fasahar fasahar foda mai taimakon fage (FAST)
Fasahar FS ta ƙunshi sigogi uku na tsari, wato zafin wuta (Tf), ƙarfin filin (E) da na yanzu (J). Hoto na 3C yana nuna canjin yanayin kowane siga a cikin tsarin FS na gargajiya. A cikin wannan yanayin, ana amfani da filin lantarki mai tsayi a kan kayan kuma zafin wutar tanderu yana tashi a kowane lokaci. Lokacin da zafin jiki na tanderun ya yi ƙasa, ƙarfin ƙarfin abu yana da girma kuma halin yanzu yana gudana ta cikin kayan yana da ƙananan. Tare da karuwar zafin jiki na tanderun, samfurin resistivity yana raguwa kuma halin yanzu yana ƙaruwa a hankali. Ana kiran wannan mataki matakin incubation kuma tsarin ana sarrafa wutar lantarki. Lokacin da zafin wutar tanderu ya tashi zuwa matsanancin zafin jiki, ƙarfin ƙarfin abu ya faɗi ba zato ba tsammani, halin yanzu yana tashi sosai, kuma FS yana faruwa. Tun da ƙarfin filin har yanzu yana da ƙarfi a wannan lokacin, ikon tsarin (W = EJ) zai hanzarta isa ga iyakar wutar lantarki, kuma tsarin zai canza daga sarrafa wutar lantarki zuwa sarrafawa na yanzu, wanda ake kira FS mataki. Lokacin da tsayayyar abu bai tashi ba, ƙarfin filin ya sake daidaitawa, kuma sintering ya shiga cikin kwanciyar hankali, wato, matakin rufewa na FS. Bayan matakin rufewa, cikakken tsarin FS ya ƙare.
Idan aka kwatanta da ƙetare na al'ada, FS yana da fa'idodi masu zuwa: rage lokacin yin gyare-gyare da kuma rage yawan zafin jiki na tanderun da ake buƙata don ƙaddamarwa, hana ci gaban hatsi, zai iya cimma rashin daidaituwa, kayan aiki mai sauƙi, ƙananan farashi.
Lokacin aikawa: Juni-07-2022