ʻO Alumina Ceramic: Hana Kūikawā me ka Mohs Hardness 9

He mea ʻoihana hana kiʻekiʻe ka alumina ceramic i kaulana no kona paʻakikī Mohs o 9. ʻO kēia waiwai e lilo ia i koho kūpono no nā noi koi, ʻoiai ma lalo o nā kūlana o ka abrasion, corrosion, a me nā mahana kiʻekiʻe. Ke nānā nei kēia ʻatikala i nā kumu kino o kona paʻakikī kiʻekiʻe a me ka hopena o ka hana kūikawā.

ʻO ke kiʻekiʻe o ka paʻakikī o ka alumina ceramic mai kona ʻano kristal kū hoʻokahi a me ka hoʻopili kemika. ʻO kāna ʻāpana mua, ʻo α-alumina (α-Al₂O₃), e hoʻohana i kahi ʻano corundum i haku ʻia me nā oxygen a me nā ion alumini i hoʻopaʻa ʻia e nā pilina ionic a me covalent ikaika. Hāʻawi kēia hoʻopili i ka ikehu lattice kiʻekiʻe, e hiki ai i ka mea ke kūʻē i ka deformation plastic a me ka haki ma lalo o ke kaumaha o waho. Eia kekahi, ʻo nā mea maka maʻemaʻe kiʻekiʻe a me nā ʻano hana sintering holomua e hoʻopau i nā micro-defects, e hoʻonui ana i ka density holoʻokoʻa a me ka paʻakikī.

ʻO ka paʻakikī kiʻekiʻe e unuhi pololei ana i ka hana kupaianaha. ʻO kona kūpaʻa ʻana i ka ʻaʻahu ʻokoʻa e hoʻohana nui ʻia i nā ʻōnaehana lawelawe lanahu i nā hale hana mana wela, nā lako hana sintering a me ka lepo i nā hale wili kila, nā paipu lawe ʻaihao i ka hana mining, nā ʻōnaehana wili palaoa maka a me ka clinker i nā hale hana sima, a me nā lako lawe pauka i ka ʻoihana kemika, e ʻoi aku ka maikaʻi ma mua o nā metala kuʻuna i ke ola lawelawe. Eia kekahi, hōʻike ka mea i ke kūpaʻa maikaʻi loa i ka palaho kemika, e kū ana i nā waikawa ikaika, alkalis, a me nā mea hoʻoheheʻe organik. Ma lalo o nā mahana kiʻekiʻe, mālama ka alumina ceramic i nā waiwai mechanical a me kemika paʻa, e hana pono ana ma luna o 1600°C. Eia kekahi, hāʻawi ka paʻakikī kiʻekiʻe i ka insulation uila maikaʻi loa a me ka conductivity thermal haʻahaʻa, e kūpono ai no nā mea uila a me nā ʻāpana hoʻokele thermal.

I ka hōʻuluʻulu manaʻo,keramika alumina, me kona paʻakikī Mohs o 9, ke pāʻani nei i kahi kuleana nui i nā ʻoihana ʻoihana a me nā ʻenehana. ʻO kona kūpaʻa kiʻekiʻe i ka ʻaʻahu a me ka pala, ke kūpaʻa wela kiʻekiʻe, a me nā waiwai insulation uila e hoʻolilo iā ia i mea koʻikoʻi no ka hana ʻana i nā hana holomua a me nā ʻenehana hou. Ke hoʻomau nei ka ulu ʻana o nā ʻano hana hana, manaʻo ʻia e hoʻonui hou ʻia nā manaʻolana noi o ka alumina ceramic.