ʻO ke kuleana koʻikoʻi o ka pauka silicon carbide i nā mea refractory
ʻO ka pauka silicon carbide ʻōmaʻomaʻo, ʻoi aku ka paʻakikī o ka inoa. He ʻano nui iakalapona kalapona (SiC), ka mea i hoʻoheheʻeʻia ma mua o 2000 degere i loko o kahi kapuahi kū'ē me nā mea maka e like me ke one quartz a me ka petroleum coke. ʻOkoʻa mai ka mea maʻamaukalapona kalapona ʻeleʻele, Loaʻa iā ia ka mana pololei o ke kaʻina hana i ka pae hope o ka hoʻoheheʻe ʻana, me ka liʻiliʻi loa o nā haumia a me ka maʻemaʻe aniani kiʻekiʻe, no laila ke hāʻawi nei ia i kahi ʻōmaʻomaʻo kūʻokoʻa a ʻeleʻele paha. ʻO kēia "maʻemaʻe" e hāʻawi iā ia i ka paʻakikī loa (ʻo ka paʻakikī Mohs he kiʻekiʻe e like me 9.2-9.3, ka lua wale nō i ka daimana a me ka boron carbide) a me ka maikaʻi loa o ka conductivity thermal a me ka ikaika kiʻekiʻe. Ma ke kahua o nā mea refractory, he "iwi paʻakikī" hiki ke kū, hakakā, wela a kūkulu.
No laila, pehea lā e hiki ai i kēia pauka ʻōmaʻomaʻo ke hōʻike i kona ikaika i ka honua paʻakikī o nā mea refractory a lilo i "kanaka kī" koʻikoʻi?
E hoʻomaikaʻi i ka ikaika a hoʻolei i nā "iwi kila" kiʻekiʻe: ʻO nā mea refractory ka mea makaʻu loa i ka "hiki ʻole ke pale" i nā wela kiʻekiʻe, lilo i palupalu a hāʻule.ʻŌmaʻomaʻo silikon carbide micropowderhe paʻakikī kiʻekiʻe loa a me ka ikaika wela kiʻekiʻe. ʻO ka hoʻohui ʻana iā ia i nā castables refractory like ʻole, nā mea ramming a i ʻole nā pilikika e like me ka hoʻohui ʻana i ke kila ikaika kiʻekiʻe i ke kaʻa. Hiki iā ia ke hana i kahi iwi kākoʻo paʻa i ka matrix, e kūʻē nui i ka deformation a me ka palupalu o ka mea ma lalo o ka haʻahaʻa wela. ʻO nā castables o ka pahu hao hao o kahi mea kanu kila nui i hoʻohana i nā mea maʻamau ma mua, i hoʻopau koke ʻia, ʻaʻole hiki ke hoʻonui ʻia ke kahe o ka hao, a me ka mālama pinepine ʻana i ka hana ʻana. Ma hope mai, ua hana ʻia nā holomua ʻenehana, a me ka hapa oʻōmaʻomaʻo silikon carbide micropowder ua hoonui loa ia. “E, kupanaha!” Ua hoʻomanaʻo hope ka luna o ka hale hana, "I ka wā i hoʻokomo ʻia ai ka mea hou, ua kahe ka hao i hoʻoheheʻe ʻia, ʻike maopopo ʻia ka ʻaoʻao o ke kahawai, ua huli ke kahe o ka hao i lalo, a ua hoʻemi ʻia ka nui o nā manawa mālama ʻia ma mua o ka hapalua, a ʻo nā kālā ke kālā maoli a pau!" ʻO kēia paʻakikī ke kumu no ka lōʻihi o nā mea wela wela.
E hoʻomaikaʻi i ka lawe ʻana i ka wela a hoʻokomo i kahi "heat sink" ma luna o ka mea: ʻoi aku ka nui o ka wela-insulating i ka mea refractory, ʻoi aku ka maikaʻi! No nā wahi e like me nā puka umu coke a me nā paia ʻaoʻao ʻaoʻao electrolytic aluminika, pono ka mea pono e hoʻokele wikiwiki i ka wela o loko e pale i ka wela o ka wahi mai ke kiʻekiʻe a me ka pōʻino. ʻO ka thermal conductivity o ka micropowder silicon carbide ʻōmaʻomaʻo he "haumāna maikaʻi loa" ma waena o nā mea metala ʻole (hiki ke piʻi aku ka coefficient thermal conductivity o ka lumi ma mua o 125 W/m·K, ʻo ia hoʻi he mau haneli o nā pōhaku lepo maʻamau). ʻO ka hoʻohui ʻana i ka mea refractory i kahi ʻāpana kikoʻī e like me ka hoʻokomo ʻana i kahi "paipu wela" maikaʻi i loko o ka mea, hiki ke hoʻomaikaʻi maikaʻi i ka conductivity thermal holoʻokoʻa, kōkua i ka wela e wikiwiki a me ka hoʻopau ʻana, a pale i ka overheating kūloko a me ka peeling a i ʻole ka pōʻino i hana ʻia e ka "heartburn".
E hoʻonui i ka pale ʻana i ka haʻalulu wela a hoʻomohala i ka hiki ke "noho mālie i ke alo o ka loli": ʻO kekahi o nā "pepehi" pilikia loa o nā mea refractory ʻo ka hoʻomaha wikiwiki a me ka wela. Hoʻopili ʻia ka umu ahi a hoʻopau ʻia ka wela, a maʻalahi nā mea maʻamau e "pahū" a ʻili.Kāpena silika ʻōmaʻomaʻoʻO ka micropowder he liʻiliʻi liʻiliʻi ka hoʻonui ʻana i ka wela a me ka conductivity thermal wikiwiki, hiki ke hoʻohālikelike koke i ke koʻikoʻi ma muli o ka ʻokoʻa wela. ʻO ka hoʻokomo ʻana iā ia i loko o ka ʻōnaehana refractory hiki ke hoʻomaikaʻi maikaʻi i ka hiki o ka mea ke kū i ka hoʻololi ʻana o ka wela, ʻo ia hoʻi, "ka pale ʻana i ka haʻalulu wela". ʻO ka waha kiln i hoʻolei ʻia o ka kiln rotary sima ke kau ʻia i ke anuanu a me ka wela loa, a ʻo kona ola pōkole he pilikia lōʻihi. Ua haʻi mai kekahi ʻenekini kūkulu umu ahi iaʻu: "Ma muli o ka hoʻohana ʻana i nā castables ikaika kiʻekiʻe me ka micropowder silicon carbide ʻōmaʻomaʻo e like me ka hui nui a me ka pauka, ua hiki koke ka hopena. hooikaika!” ʻO kēia "ʻoluʻolu" e pili ana i ka piʻi a me ka lalo o ka hana.
No ka meaʻōmaʻomaʻo silikon carbide micropowder hoʻohui i ka ikaika kiʻekiʻe, kiʻekiʻe thermal conductivity, maikaʻi loa thermal haʻalulu kū'ē, a me ka ikaika erosion kū'ē, ua lilo ia i ka "soul hoa" i ka hoʻokumu 'ana i nā mea refractory kiʻekiʻe-hana hou. Mai nā kapuahi pahū, nā mea hoʻololi, nā auwaha hao, a me nā pahu torpedo i ka hao a me ke kila kila a hiki i nā pūnaewele electrolytic i loko o ka metallurgy nonferrous; mai nā ʻāpana nui o nā kīʻaha sima a me nā kīʻaha aniani i ka ʻoihana hale a hiki i nā kiln corrosive nui i ka ʻoihana o ka ʻoihana kemika, ka mana uila, a me ka ʻōpala ʻōpala, a me ka ninini ʻana i nā kīʻaha a kahe i nā pōhaku kila no ka hoʻolei ʻana… Hoʻokomo ʻia me ka leo ʻole i loko o kēlā me kēia pā pōhaku refractory a me kēlā me kēia ʻāpana o ka castable, e hāʻawi ana i ka pale paʻa no ka "naʻau" o ka ʻoihana - nā kiln wela kiʻekiʻe.
ʻOiaʻiʻo, ʻaʻole maʻalahi ka "mahi" o ka micropowder carbide ʻōmaʻomaʻo. Mai ke koho ʻana i nā mea waiwai, ka mana pololei o ke kaʻina hoʻoheheʻe ʻana o ka umu (e hōʻoia i ka maʻemaʻe a me ka ʻōmaʻomaʻo), i ka ʻoki ʻana, ka wili ʻana, ka pickling a me ka wehe ʻana i ka haumia, hydraulic a i ʻole airflow precision classification, i ka hoʻopaʻa paʻa ʻana e like me ka hāʻawi ʻana i ka nui o nā ʻāpana (mai nā microns a i nā haneli microns), pili kēlā me kēia hana i ka hana paʻa o ka huahana hope. ʻO ka maʻemaʻe, ka puʻupuʻu nui a me ke ʻano o ka micropowder e hoʻopili pololei i kona dispersibility a me ka hopena i nā mea refractory. Hiki ke ʻōlelo ʻia ʻo ka micropowder silicon carbide kiʻekiʻe kiʻekiʻe ka huahana o ka hui ʻana o ka ʻenehana a me ka hana.