Njira Yopangira Alumina Ndi Mfundo Zofunikira Zaukadaulo

Alumina (Al₂O₃), chinthu chofunika kwambiri m'mafakitale a ceramic, chimagwiritsidwa ntchito kwambiri mu zamagetsi, makina, mankhwala, ndi ndege chifukwa cha kuuma kwake kwakukulu, kukana kuvala bwino, kukana kutentha, komanso kukhazikika kwa mankhwala. Kuchita kwa zinthu za alumina sikungotengera momwe amapangira mankhwala komanso momwe amapangira. Kupanga koyenera kumawonetsetsa kuti thupi lobiriwira la alumina limakhala ndi kachulukidwe kofananira, mphamvu zabwino, komanso kachulukidwe koyenera ka sintering yotsatira.

Pakadali pano, njira zazikulu zopangira alumina zikuphatikiza kukanikiza kowuma, kukanikiza kwa isostatic, kuponyera, kutulutsa, ndi kuponyera kotentha. Kukanikiza kowuma ndi imodzi mwa njira zodziwika bwino, zoyenera pazigawo zokhala ndi mawonekedwe osavuta komanso olondola kwambiri. Izi zimaphatikizapo kusakaniza ufa wa alumina ndi pang'ono binder ndiyeno kukakamiza (kawirikawiri makumi khumi mpaka mazana a MPa) mu nkhungu kuti apange mankhwala. Dry pressing ili ndi ubwino wa kupanga kwapamwamba komanso zipangizo zosavuta, koma kachulukidwe ka thupi lobiriwira likhoza kukhala losiyana, makamaka pazinthu zovuta{3}zooneka.

Isostatic pressing ndi yoyenera kugwiritsa ntchito zomwe zimafuna kufanana kwa thupi lobiriwira kwambiri, monga ma bearing a ceramic olondola ndi ma elekitirodi apamwamba-. Kuchita zimenezi kumaphatikizapo kuika alumina ufa mu nkhungu yotanuka ndi kuuika pamalo amphamvu kwambiri-monga madzi kapena mafuta). Kuchulukana kumatheka chifukwa cha kuthamanga kofanana (nthawi zambiri 100-300 MPa) mbali zonse. Kukanikiza kwa Isostatic kumapanga thupi lobiriwira lomwe lili ndi mphamvu zambiri komanso kugawa kachulukidwe kofananira, koma kumafuna ndalama zambiri za zida ndi zopangira.

Pamawonekedwe ovuta kapena zoonda-zokhala ndi mipanda, ma slip casting ndi hot die casting amapereka zabwino. Kuponyera kwa slip kumagwiritsa ntchito kusungunuka kwa alumina slurry, kulola kuti slurry ikhale yolimba pang'onopang'ono kupyolera mu kuyamwa kwa madzi mkati mwa nkhungu ya pulasitala. Izi zimapangitsa kuti zikhale zoyenera kuzigawo zazikulu, zoonda{3}zokhala ndi mipanda. Komano, kutentha kwa moto kumagwiritsa ntchito kutentha kusungunula parafini{{5}zomangira zomangira, zomwe zimapangitsa kuti aluminiyamu ya ufa wothira nkhungu idzaze nkhungu ikapanikizika. Izi zimapangitsa kuti zikhale zoyenera pazigawo zing'onozing'ono, zovuta, komanso zolondola.

Kuphatikiza apo, panthawi ya aluminiyamu akamaumba, kusankha kwa binder, kugawa kwa tinthu, ndi kuwongolera kukakamiza kowumbidwa kumakhudza kwambiri ntchito yomaliza. Kuwumitsa kotsatira ndi njira za sintering ndizofunikanso kuonetsetsa kuti thupi lobiriwira limakwaniritsa kachulukidwe komwe kumafunikira komanso makina amakina pambuyo pa sintering.

Mwachidule, kusankha kwa alumina akamaumba kumafuna kuganizira mozama za zinthu monga mawonekedwe azinthu, kulondola kwazithunzi, kupanga bwino, komanso mtengo wake. Ndi chitukuko cha sayansi ya zida za ceramic, matekinoloje apamwamba omangira monga jekeseni ndi kusindikiza kwa 3D pang'onopang'ono agwiritsidwa ntchito popanga zinthu za alumina, kukulitsa malo ake ogwiritsira ntchito.