ʻO ke kuleana koʻikoʻi o ka pauka silicon carbide ʻōmaʻomaʻo i nā mea refractory
ʻO ka pauka silicon carbide ʻōmaʻomaʻo, kani paʻakikī ka inoa. He ʻano ia o kasilicon carbide (SiC), kahi i hoʻoheheʻe ʻia ma mua o 2000 degere i loko o kahi umu kū'ē me nā mea maka e like me ke one quartz a me ka petroleum coke. ʻOkoʻa mai ka mea maʻamauʻeleʻele silicon carbide, loaʻa iā ia ka mana pololei o ke kaʻina hana ma ke kahua hope o ka hoʻoheheʻe ʻana, me ka liʻiliʻi o nā haumia a me ka maʻemaʻe kristal kiʻekiʻe, no laila hōʻike ia i kahi kala ʻōmaʻomaʻo a ʻeleʻele paha. Hāʻawi kēia "maʻemaʻe" iā ia i ka paʻakikī loa (ʻo ka paʻakikī Mohs e like me 9.2-9.3, ʻo ka lua wale nō i ka daimana a me ka boron carbide) a me ka conductivity thermal maikaʻi loa a me ka ikaika wela kiʻekiʻe. Ma ke kahua o nā mea refractory, he "iwi paʻakikī" hiki ke kū, hakakā, hoʻomehana a kūkulu.
No laila, pehea lā e hiki ai i kēia pauka ʻōmaʻomaʻo ke hōʻike i kona ikaika i loko o ke ao paʻakikī o nā mea refractory a lilo i "kanaka kī" koʻikoʻi?
E hoʻomaikaʻi i ka ikaika a hoʻolei i nā "iwi kila" wela kiʻekiʻe: ʻO nā mea refractory ka mea makaʻu loa i ka "hiki ʻole ke kū" i nā mahana kiʻekiʻe, e palupalu a hiolo.ʻO ka pauka microcarbide silicon ʻōmaʻomaʻoHe paʻakikī kiʻekiʻe loa a he ikaika wela kiʻekiʻe maikaʻi loa. ʻO ka hoʻohui ʻana i nā mea hoʻoheheʻe refractory like ʻole, nā mea ramming a i ʻole nā piliki e like me ka hoʻohui ʻana i ka ʻupena kila ikaika kiʻekiʻe i ka sima. Hiki iā ia ke hana i kahi iwi kākoʻo paʻa i loko o ka matrix, e kūʻē nui ana i ka deformation a me ka palupalu o ka mea ma lalo o ke kaumaha wela kiʻekiʻe. ʻO nā mea hoʻoheheʻe o ke kahawai hao umu pahū o kahi hale hana kila nui i hoʻohana i nā mea maʻamau ma mua, kahi i hoʻopau koke ʻia, ʻaʻole hiki ke hoʻonui ʻia ka nui o ke kahe hao, a ua hoʻopaneʻe pinepine ka mālama ʻana i ka hana. Ma hope mai, ua hana ʻia nā holomua loea, a ʻo ka hapa opauka micropoda silicon carbide ʻōmaʻomaʻo ua hoʻonui nui ʻia. "ʻAuē, he mea kupaianaha!" Ua hoʻomanaʻo hou ke alakaʻi o ka hale hana, "I ka wā i hoʻokomo ʻia ai ka mea hou, ua kahe ka hao i hoʻoheheʻe ʻia, ua ʻike maopopo ʻia ua 'nau ʻia' ka ʻaoʻao o ke kahawai, ua hoʻohuli ʻia ke kahe o ka hao i lalo, a ua hoʻemi ʻia ka nui o nā manawa mālama ma mua o ka hapalua, a ʻo nā kālā i mālama ʻia he kālā maoli!" ʻO kēia paʻakikī ke kumu no ke ola lōʻihi o nā lako wela kiʻekiʻe.
E hoʻomaikaʻi i ka hoʻoili wela a hoʻokomo i kahi "poho wela" ma luna o ka mea: ʻO ka ʻoi aku ka pale ʻana o ka mea refractory, ʻoi aku ka maikaʻi! No nā wahi e like me nā puka umu coke a me nā paia ʻaoʻao o ke kelepona electrolytic alumini, pono ka mea ponoʻī e hoʻoili koke i ka wela o loko e pale aku i ka mahana kūloko mai ke kiʻekiʻe loa a me ka hōʻino ʻia. ʻO ka conductivity thermal o ka silicon carbide micropowder ʻōmaʻomaʻo he "haumāna maikaʻi loa" i waena o nā mea ʻaʻole metala (hiki i ka coefficient conductivity thermal o ka lumi ke piʻi aku ma mua o 125 W/m·K, ʻo ia hoʻi he mau ʻumi manawa o nā piliki lepo maʻamau). ʻO ka hoʻohui ʻana i ka mea refractory i loko o kahi ʻāpana kikoʻī e like me ke kau ʻana i kahi "paipu wela" kūpono i loko o ka mea, hiki ke hoʻomaikaʻi nui i ka conductivity thermal holoʻokoʻa, kōkua i ka wela e hoʻopau koke ʻia a like, a pale i ka wela nui a me ka ʻili ʻana a i ʻole ka hōʻino ʻia e ka "heartburn".
E hoʻoikaika i ke kūpaʻa ʻana i ka haʻalulu wela a hoʻomohala i ka hiki ke "noho mālie i ke alo o ka loli": ʻO kekahi o nā "mea pepehi" pilikia loa o nā mea paʻakikī, ʻo ia ka hoʻomaʻalili wikiwiki a me ka hoʻomehana ʻana. Hoʻā a pio ka umu, a loli nui ka mahana, a maʻalahi nā mea maʻamau e "pahū" a hemo.ʻO ka carbide silicon ʻōmaʻomaʻoHe liʻiliʻi ka coefficient hoʻonui wela o ka micropowder a me ka conductivity wela wikiwiki, hiki ke hoʻohālikelike koke i ke kaumaha i hoʻokumu ʻia e ka ʻokoʻa o ka mahana. ʻO ka hoʻokomo ʻana i loko o ka ʻōnaehana refractory hiki ke hoʻomaikaʻi nui i ka hiki o ka mea ke kūʻē i nā loli wela koke, ʻo ia hoʻi, "ke kū'ē ʻana i ka haʻalulu wela". ʻO ka hao waha umu i hoʻoheheʻe ʻia o ka umu rotary sima ua hoʻopilikia ʻia i nā haʻalulu anu a me ka wela loa, a ʻo kona ola pōkole he pilikia lōʻihi. Ua haʻi mai kekahi ʻenekinia hana umu akamai iaʻu: "Mai ka hoʻohana ʻana i nā mea hoʻoheheʻe ikaika kiʻekiʻe me ka micropowder silicon carbide ʻōmaʻomaʻo ma ke ʻano he aggregate nui a me ka pauka, ua koke ka hopena. Ke puhi ka makani anuanu i ka wā e hoʻōki ai ka umu no ka mālama ʻana, e nahā nā ʻāpana ʻē aʻe, akā paʻa a paʻa kēia mea waha umu, a he emi nā māwae ʻili. Ma hope o kahi pōʻaiapuni, ua emi iki ka pohō, e mālama ana i nā hana hoʻoponopono he nui!" ʻO kēia "mālie" e hana me nā piʻi a me nā iho i ka hana ʻana.
No ka meapauka micropoda silicon carbide ʻōmaʻomaʻo Hoʻohui i ka ikaika kiʻekiʻe, ka conductivity wela kiʻekiʻe, ke kūpaʻa haʻalulu wela maikaʻi loa, a me ke kūpaʻa ikaika i ka erosion, ua lilo ia i "hoa pili" i ka hoʻokumu ʻana o nā mea refractory hana kiʻekiʻe o kēia wā. Mai nā umu pahū, nā mea hoʻololi, nā ʻauwaha hao, a me nā pahu torpedo i ka hao a me ke kila metallurgy i nā cell electrolytic i ka metallurgy nonferrous; mai nā ʻāpana koʻikoʻi o nā umu sima a me nā umu aniani i ka ʻoihana mea kūkulu hale i nā umu corrosive loa i nā kahua o ka ʻoihana kemika, ka mana uila, a me ka puhi ʻōpala, a hiki i nā kīʻaha ninini a me nā pōhaku kila kahe no ka hoʻolei ʻana… Ma nā wahi a pau e loaʻa ai ke kiʻekiʻe o ka mahana, ka ʻaʻahu, ka loli koke, a me ka erosion, hana kēia micropowder ʻōmaʻomaʻo. Hoʻokomo mālie ʻia ia i loko o kēlā me kēia pōhaku refractory a me kēlā me kēia square o ka castable, e hāʻawi ana i ka pale paʻa no ka "puʻuwai" o ka ʻoihana - nā umu wela kiʻekiʻe.
ʻOiaʻiʻo, ʻaʻole maʻalahi ka "mahi ʻana" o ka micropowder silicon carbide ʻōmaʻomaʻo. Mai ke koho ʻana i nā mea maka, ka kaohi pololei ʻana i ke kaʻina hana hoʻoheheʻe umu pale (e hōʻoia i ka maʻemaʻe a me ka ʻōmaʻomaʻo), i ka wāwahi ʻana, ka wili ʻana, ka pickling a me ka wehe ʻana i ka haumia, ka hoʻokaʻawale pololei ʻana o ka hydraulic a i ʻole ke kahe ʻana o ka ea, i ka hoʻopili paʻa ʻana e like me ka hoʻolaha ʻana o ka nui o nā ʻāpana (mai kekahi mau microns a i nā haneli microns), pili kēlā me kēia ʻanuʻu i ka hana paʻa o ka huahana hope loa. Ma ke ʻano kūikawā, ʻo ka maʻemaʻe, ka hoʻolaha ʻana o ka nui o nā ʻāpana a me ke ʻano o nā ʻāpana o ka micropowder e pili pololei ana i kona dispersibility a me ka hopena i nā mea refractory. Hiki ke ʻōlelo ʻia ʻo ka micropowder silicon carbide ʻōmaʻomaʻo kiʻekiʻe ʻo ia ka huahana o ka hui pū ʻana o ka ʻenehana a me ka hana lima.