Silicon carbide (SiC) pauda seramikaloaʻa i nā pono o ka ikaika wela kiʻekiʻe, maikaʻi oxidation kū'ē, kiʻekiʻe lole pale a me ka thermal paʻa, liʻiliʻi thermal hoʻonui coefficient, kiʻekiʻe thermal conductivity, maikai kemika paʻa, etc. nā mea hana, nā ʻāpana pale wela, nā ʻāpana ʻenekini mokulele, nā moku hopena kemika, nā paipu hoʻololi wela a me nā mea hana ʻē aʻe ma lalo o nā kūlana koʻikoʻi, a he mea hoʻohana nui ʻia ka ʻenehana loea.ʻAʻole wale ia he hana koʻikoʻi i nā ʻenehana kiʻekiʻe i lalo o ka hoʻomohala ʻana (e like me nā mīkini seramika, spacecraft, a me nā mea ʻē aʻe), akā he mākeke ākea a me nā kahua noi e hoʻomohala ʻia i ka ikehu o kēia manawa, metallurgy, mīkini, nā mea kūkulu hale. , ʻoihana kemika a me nā ʻoihana ʻē aʻe.

Nā ʻano hoʻomākaukau oka pauda kalapona silikahiki ke hoʻokaʻawale nui ʻia i ʻekolu mau ʻāpana: ke ʻano hana paʻa paʻa, ke ʻano hana wai a me ke ʻano hana kinoea.

1. Keʻano hana paʻa

ʻO ke ʻano hana paʻa paʻa ka nui o ke ʻano hoʻemi carbothermal a me ke ʻano hana hoʻohālikelike kalapona silika.Hoʻokomo pū ʻia nā ʻano hoʻohaʻahaʻa Carbothermal me ke ʻano Acheson, ke ʻano o ka umu ahi a me ke ʻano hoʻololi wela kiʻekiʻe.ʻO ka pauka kalapona silikaUa hoʻomākaukau mua ʻia ka hoʻomākaukau ʻana e ke ʻano Acheson, me ka hoʻohana ʻana i ka coke e hōʻemi i ka silicon dioxide i ke kiʻekiʻe wela (e pili ana i 2400 ℃), akā ʻo ka pauka i loaʻa ma kēia ʻano he nui ka nui o ka nui (> 1mm), hoʻopau i ka ikehu, a ʻo ke kaʻina hana. paʻakikī.I nā makahiki 1980, ua ʻike ʻia nā mea hana hou no ka synthesizing β-SiC pauda, ​​e like me ka umu ahi a me ka mea hoʻololi wela kiʻekiʻe.E like me ka hoʻomaʻamaʻa maikaʻi a me ka polymerization kūikawā ma waena o ka microwave a me nā mea kemika i loko o ka paʻa ua hoʻomaʻamaʻa mālie ʻia, ʻo ka ʻenehana o ka synthesizing sic pauka e ka hoʻomehana microwave ua lilo i mea makua.Hoʻokomo pū ʻia ke ʻano hana hoʻoheheʻe kalapona kalapona kiʻekiʻe (SHS) a me ke ʻano hana hoʻohui mechanical.Hoʻohana ke ʻano hana hoʻoemi SHS i ka hopena exothermic ma waena o SiO2 a me Mg e hoʻoponopono ai i ka nele o ka wela.ʻO kaka pauda kalapona silikaLoaʻa i kēia ʻano ka maʻemaʻe kiʻekiʻe a me ka liʻiliʻi liʻiliʻi, akā pono e hoʻoneʻe ʻia ka Mg i ka huahana e nā kaʻina hana e like me ka pickling.

2 kaʻina hana wai

ʻO ke kaʻina hana wai ka nui o ke ʻano sol-gel a me ke ʻano decomposition thermal polymer.ʻO ke ʻano Sol-gel kahi ala e hoʻomākaukau ai i ka gel i loaʻa iā Si a me C ma ke kaʻina hana sol-gel kūpono, a laila pyrolysis a me ka hoʻohaʻahaʻa carbothermal wela kiʻekiʻe e loaʻa ai ka carbide silicon.ʻO ka decomposition kiʻekiʻe o ka polymer organik kahi ʻenehana maikaʻi no ka hoʻomākaukau ʻana i ka carbide silicon: ʻo kekahi e wela i ka gel polysiloxane, ka hopena decomposition e hoʻokuʻu i nā monomers liʻiliʻi, a ma hope e hana ʻia ʻo SiO2 a me C, a laila ma ke kalapona hōʻemi hopena e hana ai i ka pauka SiC;ʻO ka mea ʻē aʻe e hoʻomāhana i ka polysilane a i ʻole polycarbosilane e hoʻokuʻu i nā monomers liʻiliʻi e hana i kahi iwi, a hope loa.ka pauda kalapona silika.

3 Keʻano hana kinoea

I kēia manawa, ke kinoea māhele synthesis okalapona kalaponaKe hoʻohana nui nei ka pauka ultrafine ceramic i ka hoʻoheheʻe ʻana i ke kinoea (CVD), Plasma Induced CVD, Laser Induced CVD a me nā ʻenehana ʻē aʻe e hoʻoheheʻe i ka mea ola i ka wela kiʻekiʻe.Loaʻa ka maikaʻi o ka pauka i loaʻa i ka maʻemaʻe kiʻekiʻe, ka liʻiliʻi liʻiliʻi liʻiliʻi, ka liʻiliʻi o ka agglomeration a me ka maʻalahi o ka mālama ʻana i nā ʻāpana.ʻO ia keʻano kūlana kiʻekiʻe i kēia manawa, akā me ke kumukūʻai kiʻekiʻe a me ka haʻahaʻa haʻahaʻa, ʻaʻole maʻalahi ka hoʻokō ʻana i ka hana nui, a ʻoi aku ka maikaʻi no ka hana ʻana i nā mea ʻenehana a me nā huahana me nā koi kūikawā.

I kēia manawa, kaka pauda kalapona silikahoʻohana nui ʻia ka submicron a i ʻole ka pauka pae nano, no ka mea he liʻiliʻi ka nui o ka pauka, ʻoihana kiʻekiʻe, no laila ʻo ka pilikia nui ʻo ia ka maʻalahi o ka pauka e hana i ka agglomeration, pono e hoʻololi i ka ʻili o ka pauka e pale ai a keʻakeʻa paha. ka hookui lua o ka pauda.I kēia manawa, ʻo nā ʻano o ka hoʻopuehu ʻana o ka pauka SiC ka mea nui i kēia mau ʻano: ka hoʻololi ʻana o ka ʻili kiʻekiʻe, ka holoi ʻana, ka mālama ʻana i ka pauka, ka hoʻololi ʻana i ka uhi ʻole, ka hoʻololi ʻana i ka uhi kūlohelohe.