Aikace-aikacen α-alumina a cikin saboalumina ceramics
Ko da yake akwai nau'ikan sabbin kayan yumbu da yawa, ana iya raba su kusan zuwa nau'i uku gwargwadon ayyukansu da amfaninsu: yumbu mai aiki (wanda kuma aka sani da yumbu na lantarki), yumbu na tsari (wanda kuma aka sani da yumbu injiniyoyi) da bioceramics. Dangane da sassa daban-daban na albarkatun kasa da aka yi amfani da su, ana iya raba su zuwa yumbu oxide, yumbu nitride, yumbu na boride, yumbu na carbide da yumbu na ƙarfe. Daga cikin su, yumburan alumina suna da mahimmanci, kuma albarkatunsa shine α-alumina foda na ƙayyadaddun bayanai daban-daban.
Ana amfani da α-alumina sosai a cikin samar da sababbin kayan yumbura daban-daban saboda ƙarfinsa, babban ƙarfinsa, juriya mai zafi, juriya da sauran kyawawan kaddarorin. Shi ne ba kawai wani foda albarkatun kasa don ci-gaba alumina yumbu kamar hadedde kewaye substrates, wucin gadi duwatsu masu daraja, yankan kayan aiki, wucin gadi kasusuwa, da dai sauransu, amma kuma za a iya amfani da matsayin phosphor m, ci-gaba refractory kayan, musamman nika kayan, da dai sauransu Tare da ci gaban na zamani kimiyya da fasaha, da aikace-aikace filin na α-alumina ne da sauri fadada, da kuma m kasuwa yana karuwa, da kuma buƙatun da ake bukata.
Aikace-aikacen α-alumina a cikin yumbu mai aiki
Tukwane mai aikikoma zuwa ci-gaba yumbu waɗanda ke amfani da lantarki, maganadisu, acoustic, gani, zafi da sauran kaddarorinsu ko tasirin haɗin gwiwarsu don cimma wani aiki. Suna da kaddarorin lantarki da yawa irin su rufi, dielectric, piezoelectric, thermoelectric, semiconductor, ion conductivity da superconductivity, don haka suna da ayyuka da yawa da aikace-aikace masu fa'ida. A halin yanzu, manyan waɗanda aka sanya su cikin amfani mai amfani akan babban sikelin sune insulating yumbu don haɗaɗɗen madauri da marufi, injin walƙiya na walƙiya insulating yumbu, capacitor dielectric yumbu da aka yi amfani da shi sosai a cikin talabijin da masu rikodin bidiyo, yumburan piezoelectric tare da amfani da yawa da tukwane masu mahimmanci don na'urori masu auna firikwensin daban-daban. Bugu da kari, ana kuma amfani da su don bututu masu fitar da hasken sodium mai matsa lamba.
1. Falogi mai rufin yumbu
Spark plug insulating yumbu a halin yanzu shine kawai mafi girman aikace-aikacen yumbu a cikin injuna. Saboda alumina yana da ingantaccen rufin wutan lantarki, ƙarfin injina mai ƙarfi, juriya mai ƙarfi da juriya na zafin zafi, alumina insulating walƙiya ana amfani da su sosai a duniya. Abubuwan buƙatun α-alumina don walƙiya sune ƙananan ƙananan sodium α-alumina micropowders, wanda abun ciki na sodium oxide shine ≤0.05% kuma matsakaicin girman barbashi shine raga 325.
2. Haɗe-haɗe-haɗe-haɗe da kayan marufi
Abubuwan yumbu da aka yi amfani da su azaman kayan marufi da kayan marufi sun fi robobi a cikin abubuwan da suka biyo baya: babban juriya na rufi, juriya mai lalata sinadarai, babban rufewa, rigakafin shigar danshi, babu amsawa, kuma babu gurɓata zuwa siliki mai tsabta mai tsabta. Abubuwan da ake buƙata na α-alumina da ake buƙata don haɗaɗɗen keɓaɓɓun keɓaɓɓun keɓaɓɓun keɓaɓɓu da kayan marufi sune: ƙimar haɓaka haɓakar thermal 7.0 × 10-6 / ℃, haɓakar thermal 20-30W / K · m (zazzabi na ɗakin), dielectric akai 9-12 (IMH), asarar dielectric 3 ~ 10-4 (IMHz), juriya na girma> 10mm / 10mm.
Tare da babban aiki da babban haɗin kai na haɗaɗɗun da'irori, ƙarin buƙatun buƙatu ana gabatar da su don marufi da kayan tattarawa:
Yayin da haɓakar zafi na guntu ya karu, ana buƙatar mafi girman halayen thermal.
Tare da babban saurin nau'in ƙididdiga, ana buƙatar ƙananan dielectric akai-akai.
Ana buƙatar ƙimar faɗaɗawar thermal don kasancewa kusa da silicon. Wannan yana sanya buƙatu mafi girma akan α-alumina, wato, yana haɓakawa a cikin jagorancin babban tsarki da lafiya.
3. Hasken haske mai haske na sodium mai ƙarfi
Kyakkyawan tukwanewanda aka yi da alumina mai ɗorewa mai tsabta kamar yadda albarkatun ƙasa suna da halaye na juriya na zafin jiki, juriya na lalata, haɓaka mai kyau, ƙarfi mai ƙarfi, da sauransu, kuma sune kyawawan kayan yumbu na gani. Polycrystalline mai haske da aka yi da alumina mai tsabta tare da ƙaramin adadin magnesium oxide, iridium oxide ko iridium oxide additives, kuma an yi shi ta hanyar sinadarai na yanayi da matsi mai zafi, zai iya jure wa lalatawar tururin sodium mai zafin jiki kuma ana iya amfani dashi azaman fitilar hasken sodium mai ƙarfi mai ƙarfi tare da haɓakar haske mai haske.
Aikace-aikacen α-alumina a cikin yumbu na tsari
A matsayin kayan aikin inorganic biomedical, kayan bioceramic ba su da wani sakamako mai guba idan aka kwatanta da kayan ƙarfe da kayan polymer, kuma suna da kyakkyawan daidaituwa da juriya na lalata tare da kyallen takarda. Mutane sun ƙara daraja su. Bincike da aikace-aikacen asibiti na kayan bioceramic sun haɓaka daga maye gurbin ɗan gajeren lokaci da cikowa zuwa dawwama da ɗorewa, kuma daga kayan inert na ilimin halitta zuwa kayan aiki na ilimin halitta da kayan haɗaɗɗun lokaci mai yawa.
A cikin 'yan shekarun nan, porousalumina ceramicsan yi amfani da su don yin haɗin gwiwa na wucin gadi, haɗin gwiwar gwiwa na wucin gadi, kawunan mata na wucin gadi, sauran kasusuwa na wucin gadi, tushen hakori na wucin gadi, gyaran gyare-gyaren kashi, da gyaran gyare-gyaren corneal saboda juriya na lalata sinadarai, juriya mai kyau, kwanciyar hankali mai kyau na zafin jiki, da kaddarorin thermoelectric. Hanya don sarrafa girman pore yayin shirye-shiryen yumbu na alumina mai ƙyalƙyali shine haɗuwa da barbashi na alumina daban-daban masu girma dabam, kumfa impregnate, da fesa bushewar barbashi. Aluminum faranti kuma za a iya anodized don samar da kwatance nano-sikelin microporous tashar pores irin.