Kodi Porous Silicon Carbide Ceramics ndi chiyani?

Pamene zitsanzo zazoumba za silicon carbide zokhala ndi porousPoyamba zinaoneka mu labotale, kapangidwe konga uchi komwe kamapezeka pansi pa maikulosikopu ya elekitironi kankaoneka ngati mng'oma wa njuchi womwe wakulitsidwa nthawi miliyoni. Zinthu zapaderazi zokhala ndi ma porosity a 15-60% zikuyenda pang'onopang'ono kuchokera m'zipinda zoyaka za injini za ndege kupita ku miyoyo yathu yatsiku ndi tsiku.

Mu turbine ya gasi pa kutentha kwa 1600℃, zinthu wamba zakhala zikusintha kukhala chitsulo chosungunuka, koma silicon carbide yokhala ndi pobowo imasunga kukhazikika kodabwitsa. Chaka chatha, poyendera Shanghai Institute of Ceramics of the Chinese Academy of Sciences, wofufuza adawonetsa kuyesa kosangalatsa: kuyika pepala la silicon carbide yokhala ndi pobowo mu lawi la okosijeni-acetylene (pafupifupi 3000℃), thermometer kumbuyo idawonetsa kuti idakwera ndi 72℃ yokha. Kukana kutentha kumeneku komwe kumachokera ku kapangidwe ka kristalo ka β-SiC kumapangitsa kuti ikhale "chida chosawoneka" cha chitetezo cha kutentha cha zombo zamlengalenga. Chabwinonso, ma pores okulirapo a micron ali ngati ma chimney ang'onoang'ono ambiri, kuchepetsa mphamvu yoyendetsera kutentha ndi 40-60% poyerekeza ndi zombo zolimba.

Mwina ngakhale asayansi a zinthu sanayembekezere kuti mtundu uwu wa ceramic, womwe poyamba unapangidwira malo ovuta kwambiri, ungakumane ndi masika achiwiri m'munda wa zamankhwala. Kafukufuku wa zachipatala wofalitsidwa mu Journal of Biomaterials mu 2024 ukuwonetsa kuti ma scaffolds a silicon carbide okhala ndi mapangidwe a gradient pore size (5μm pamwamba ndi 200μm pansi) ali ndi fupa lophatikizana nthawi 2.3 kuposa la titanium alloy implants yachikhalidwe.

Njira yokonzekera silicon carbide yokhala ndi porous ndi matsenga a mankhwala. Pogwiritsa ntchito njira yopangira ma pore (yomwe nthawi zambiri imakhala polymethyl methacrylate microspheres) kapena njira yopangira reaction sintering, mainjiniya azinthu amatha kuwongolera bwino mawonekedwe a ma pore monga opanga zonunkhira. Chosangalatsa ndichakuti, patent yaposachedwa ya 3M Company ku United States ikuwonetsa kuti kugwiritsa ntchito diatomite yobwezerezedwanso ngati template yachilengedwe sikuti kumangochepetsa ndalama zopangira ndi 18%, komanso mosayembekezereka kumapeza kapangidwe ka bionic kofanana ndi mafupa a coral. Njira iyi "yosandutsa zinyalala kukhala chuma" ikugwirizana bwino ndi nzeru za Taoist za "kuthandiza kwa opanda ntchito".

Kugwiritsa ntchito

• Pankhani yoteteza chilengedwe:Monga chinthu chachikulu chomwe chimagwiritsidwa ntchito popanga zosefera za tinthu tating'onoting'ono ta magalimoto a dizilo (DPF), imatha kugwira 99.7% ya PM2.5.
•  Kusintha kwa Mphamvu:Chithandizo cha ma electrode cha ma cell amafuta olimba a oxide (SOFC) chimawonjezera mphamvu zopangira magetsi kufika pa 65%
•  Zamankhwala:Kapangidwe ka ma pore a ma scaffolds a mafupa osindikizidwa mu 3D amalimbikitsa kukula kwa maselo ndikufupikitsa nthawi yochira kuchipatala ndi 30%.
•  Kupanga ma semiconductor:Nthawi yokhalitsa ya ma wafer polishing pads yawonjezeredwa katatu, ndipo njira ya TSMC ya 3nm yagulidwa mochuluka.