Ke wehe nei i nā waiwai kūʻokoʻa a me nā manaʻo noiʻi o ka micropowder silicon carbide ʻōmaʻomaʻo
I kēia lā ʻenehana kiʻekiʻe ʻenehana, ʻo ka ʻōmaʻomaʻo silicon carbide micropowder ke lilo mālie nei i mea nui o ka nānā ʻana i nā kaiāulu ʻepekema waiwai me kāna mau waiwai kino a me nā kemika. ʻO kēia pūhui i haku ʻia me nā mea kalapona a me ke silika ua hōʻike i nā manaʻo noiʻi ākea i nā ʻoihana ʻoihana he nui ma muli o kona ʻano aniani kūikawā a me ka hana maikaʻi loa. E ʻimi hohonu ana kēia ʻatikala i nā waiwai kūʻokoʻa o ka micropowder silicon carbide ʻōmaʻomaʻo a me kona hiki ke hoʻohana i nā ʻano hana like ʻole.
1. ʻO nā hiʻohiʻona kumu o ka micropowder silicon carbide ʻōmaʻomaʻo
ʻO ka ʻōmaʻomaʻo silicon carbide (SiC) kahi mea superhard synthetic a no kahi hui paʻa covalent. Hōʻike kona ʻano aniani i kahi ʻōnaehana hexagonal me kahi hoʻonohonoho e like me ke daimana. ʻO ka ʻōmaʻomaʻo ʻōmaʻomaʻo carbide micropowder e pili ana i nā huahana pauka me ka nui o ka nui o 0.1-100 microns, a ʻo kona kala ke hōʻike nei i nā ʻano leo like ʻole mai ka ʻōmaʻomaʻo māmā a i ka ʻōmaʻomaʻo ʻeleʻele ma muli o ka maʻemaʻe like ʻole a me ka haumia.
Mai ka ʻano microscopic, ʻo kēlā me kēia ʻātoma silika i loko o ke aniani kalapona kalapona ʻōmaʻomaʻo e hana i kahi hui tetrahedral me ʻehā mau kalapona kalapona. Hāʻawi kēia ʻano paʻa covalent ikaika i ka mea paʻa kiʻekiʻe loa a me ka paʻa kemika. He mea pono e hoʻomaopopo i ka paʻakikī o Mohs o ka'ōmaʻomaʻo silicon carbide hiki i 9.2-9.3, ka lua wale nō i ka daimana a me ka cubic boron nitride, kahi e hiki ai ke hoʻololi i ke kahua o nā abrasives.
2. ʻO nā waiwai kūʻokoʻa o ka micropowder carbide ʻōmaʻomaʻo
1. ʻO nā mea mechanical maikaʻi loa
ʻO ka hiʻohiʻona kaulana loa o ka ʻōmaʻomaʻo silicon carbide micropowder ʻo ia kona paʻakikī kiʻekiʻe. Hiki i kona paʻakikī Vickers ke piʻi i ka 2800-3300kg/mm², kahi e hana maikaʻi ai i ka wā e hana ai i nā mea paʻakikī. Ma ka manawa like, ʻo ka ʻōmaʻomaʻo silicon carbide ka ikaika compressive maikaʻi a hiki ke mālama i ka ikaika mechanical kiʻekiʻe i nā wela kiʻekiʻe. Hiki i kēia hiʻohiʻona ke hoʻohana iā ia i nā kaiapuni koʻikoʻi.
2. Nā waiwai wela maikaʻi
ʻO ke kiʻekiʻe o ka thermal conductivity o ka carbide silicon green e like me 120-200W/(m·K), ʻo ia ka 3-5 mau manawa o ke kila maʻamau. ʻO kēia conductivity thermal maikaʻi e hana ia i mea hoʻopau wela kūpono. ʻO ka mea kupanaha loa, ʻo ka nui o ka hoʻonui wela o ka carbide silika ʻōmaʻomaʻo he 4.0 × 10⁻⁶/℃ wale nō, ʻo ia hoʻi he kūpaʻa maikaʻi loa i ka wā e hoʻololi ai ka mahana, ʻaʻole e hoʻopuka i ka deformation maopopo ma muli o ka hoʻonui ʻana a me ka contraction.
3. Paʻa kemika koʻikoʻi
Ma ke ʻano o nā waiwai kemika, hōʻike ka ʻōmaʻomaʻo silicon carbide i ka inertness ikaika loa. Hiki iā ia ke pale i ka ʻino o ka hapa nui o nā waikawa, nā alkalis a me nā paʻakai paʻakai, a hiki ke kūpaʻa i nā wela kiʻekiʻe. Hōʻike nā hoʻokolohua hiki ke hoʻomau i ka paʻa maikaʻi o ka carbide ʻōmaʻomaʻo i loko o kahi kaiapuni oxidizing ma lalo o 1000 ℃, hiki iā ia ke hoʻohana lōʻihi i nā kaiapuni corrosive.
4. Nā waiwai uila kūikawā
ʻO ka carbide silicon ʻōmaʻomaʻo kahi mea semiconductor bandgap ākea me kahi ākea bandgap o 3.0eV, ʻoi aku ka nui ma mua o ka 1.1eV o ke silikoni. ʻO kēia hiʻohiʻona e hiki ai iā ia ke pale i nā voltage kiʻekiʻe a me nā mahana, a he mau pono kūʻokoʻa ma ke kahua o ka mana uila. Eia kekahi, ʻo ka carbide silicon ʻōmaʻomaʻo i loaʻa i kahi mobility electron kiʻekiʻe, kahi e hiki ai ke hoʻomohala i nā hāmeʻa kiʻekiʻe.
3. Hoʻomākaukau kaʻina hana o ka ʻōmaʻomaʻo silicon carbide micropowder
ʻO ka hoʻomākaukau ʻana i ka micropowder carbide ʻōmaʻomaʻo e hoʻohana nui i ke kaʻina Acheson. Hoʻohui kēia ʻano hana i ke one quartz a me ka coke petroleum i kekahi ʻāpana a hoʻomaʻamaʻa iā lākou i 2000-2500 ℃ i loko o kahi umu kūʻē no ka pane ʻana. ʻO ka carbide ʻōmaʻomaʻo ʻōmaʻomaʻo i hana ʻia e ka hopena e hana i nā kaʻina hana e like me ka ʻoki ʻana, ka paʻi ʻana, a me ka pickling no ka loaʻa ʻana o nā huahana micropowder o nā ʻāpana like ʻole.
I nā makahiki i hala iho nei, me ka holomua o ka ʻenehana, ua puka mai kekahi mau hana hoʻomākaukau hou. Hiki ke hoʻomākaukau i ka pauka carbide silika ʻōmaʻomaʻo maʻemaʻe kiʻekiʻe nano-scale (CVD); hiki i ke ʻano sol-gel ke hoʻomalu pono i ka nui o ka ʻāpana a me ka morphology o ka pauka; hiki i ke ala plasma ke hoʻokō i ka hana mau a hoʻomaikaʻi i ka hana hana. Hāʻawi kēia mau kaʻina hana hou i nā mea hiki ke hoʻonui i ka hana a me ka hoʻonui ʻana i ka noi o ka micropowder silicon carbide ʻōmaʻomaʻo.
4. Nā wahi noi nui o ka micropowder silicon carbide
1. ʻO ka wili a me ka polishing pololei
Ma ke ʻano he superhard abrasive, ʻōmaʻomaʻo silicon carbide micropowder i hoʻohana nui ʻia i ka hana pololei o ka carbide cemented, ceramics, aniani a me nā mea ʻē aʻe. Ma ka ʻoihana semiconductor, hoʻohana ʻia ka pauka silicon carbide ʻōmaʻomaʻo kiʻekiʻe no ka hoʻoliʻiliʻi ʻana i nā wafer silika, a ʻoi aku ka maikaʻi o kāna hana ʻoki ʻana ma mua o nā alumina abrasives kahiko. Ma ke kahua o ka hoʻoili ʻana i ka ʻāpana optical, hiki i ka pauka silicon carbide ʻōmaʻomaʻo ke hoʻokō i ka ʻili o ka ʻili nano-scale a hoʻokō i nā koi o ka hana ʻana o nā ʻāpana optical kiʻekiʻe.
2. Nā mea seramika kiʻekiʻe
ʻO ka'ōmaʻomaʻo'ōmaʻomaʻo carbide pauka he mea koʻikoʻi no ka hoʻomākaukauʻana i nā seramika kiʻekiʻe. Hiki ke hana ʻia nā seramika i kūkulu ʻia me nā ʻano mechanical maikaʻi loa a me ke kūpaʻa wela ma o ke kaʻina hana hoʻoheheʻe wela a i ʻole nā kaʻina hana sintering. Hoʻohana nui ʻia kēia ʻano mea ceramic i nā ʻāpana koʻikoʻi e like me nā sila mechanical, bearings, a me nā nozzles, ʻoi aku hoʻi i nā kūlana hana paʻakikī e like me ke kiʻekiʻe kiʻekiʻe a me ka corrosion.
3. Nā mea uila a me nā mea semiconductor
Ma ke kahua o ka uila, hoʻohana ʻia ka pauka silicon carbide e hoʻomākaukau i nā mea semiconductor bandgap ākea. ʻO nā mea mana e pili ana i ka carbide silika ʻōmaʻomaʻo he mau hiʻohiʻona hana kiʻekiʻe, kiʻekiʻe-volt a me ka wela wela, a hōʻike i ka mana nui i nā kaʻa ikehu hou, nā grids akamai a me nā māla ʻē aʻe. Ua hōʻike ʻia nā haʻawina e hiki ke hōʻemi i ka nalowale o ka ikehu ma mua o 50% ke hoʻohālikelike ʻia me nā mea hana silicon carbide.
4. Hoʻoikaika hui
ʻO ka hoʻohui ʻana i ka pauka silicon carbide ʻōmaʻomaʻo ma ke ʻano he mea hoʻoikaika i kahi metala a i ʻole polymer matrix hiki ke hoʻomaikaʻi nui i ka ikaika, paʻakikī a me ke kūpaʻa ʻana o ka mea hoʻohui. Ma ke kahua aerospace, hoʻohana ʻia nā composites silicon carbide i hoʻokumu ʻia i ka alumini no ka hana ʻana i nā ʻāpana māmā a me ka ikaika kiʻekiʻe; i loko o ka ʻoihana kaʻa, hōʻike maikaʻi ʻia nā pale pahu silicon carbide i hoʻoikaika ʻia.
5. Nā mea refractory a me nā uhi
Ke hoʻohana nei i ke kūpaʻa kiʻekiʻe o ka carbide silicon green, hiki ke hoʻomākaukau ʻia nā mea refractory kiʻekiʻe. I loko o ka ʻoihana hoʻoheheʻe kila, hoʻohana nui ʻia nā brick refractory silicon carbide i nā mea wela kiʻekiʻe e like me nā umu ahi a me nā mea hoʻololi. Eia kekahi, hiki i ka silicon carbide coatings ke hāʻawi i ka lole maikaʻi loa a me ka pale corrosion no ka mea kumu, a hoʻohana ʻia i nā mea kemika, nā turbine blades a me nā māla ʻē aʻe.