Molybdenum Silicide, MoSi2

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Molybdenum Silicide, MoSi2

ʻO Molybdenum disilicide (Molybdenumdisilicide, MoSi2) kahi ʻano silikone molybdenum i hoʻohui ʻia, no ka mea like nā radius atomic ʻelua, electronegativity kokoke, no laila like ia me ke ʻano o ka metala a me ka ceramic.


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ʻO Molybdenum disilicide (Molybdenumdisilicide, MoSi2) kahi ʻano silikone molybdenum i hoʻohui ʻia, no ka mea like nā radius atomic ʻelua, electronegativity kokoke, no laila like ia me ke ʻano o ka metala a me ka ceramic. Me kahi pae hoʻoheheʻe a 2030 ℃ a me ka uila conductivity, hiki ke hana i ka silica dioxide passivating layer ma luna o ka ʻili i ke ana wela kiʻekiʻe e pale aku ai i ka hoʻoheheʻe ʻana. ʻO kona helehelena he kala metala hina, i loaʻa mai i kāna ʻano aniani quadric-type, a aia kekahi hexagonal akā paʻa ʻole i kūkulu ʻia ke ʻano aniani. ʻAʻole hiki ke hoʻoheheʻe ʻia i ka hapa nui o nā waikawa, akā hiki ke hoʻoheheʻe ʻia i ka waikawa nitric a me ka hydrofluoric acid.
ʻO MoSi2 kahi ʻano mesophase me ka ʻike silicon kiʻekiʻe loa i ka ʻōnaehana binary binary mo-SI. He ʻano mea mehana kiʻekiʻe me ka hana maikaʻi loa. ʻO ke kūpikipiki kūpikipiki kūpikipiki maikaʻi loa a hiki i 1600 ℃, like ia me SiC; Lōpū kiʻekiʻena (6.24g / cm3); Kaʻi lauwewe hoʻonui hoʻonui haʻahaʻa (8.1 × 10-6K-1); Hōʻawe uila maikaʻi; ʻO ke ana wela hoʻololi ductile kiʻekiʻe (1000 ℃) ma lalo o ka pālolo - e like me ka paʻakikī paʻakikī. Ma 1000 ℃ ma luna o ka metala e like me Hoʻohana nui ʻia ʻo MoSi ma ke ʻano he mea hoʻomehana, kaapuni hoʻohui, ka pale anti-oxidation wela kiʻekiʻe a me nā mea kūkulu wela kiʻekiʻe. Ma MoSi2, hoʻopaʻa ʻia ka molybdenum a me ka silikone e nā mea hao hao, hoʻopili ʻia ka silikona a me ka silikone e nā mea paʻa covalent, a me ka disilicide molybdenum. He aniani quadripartite hina. ʻAʻole hiki ke hoʻoheheʻe ʻia i loko o nā waikawa mineral āpau (me aqua aqua), akā hiki ke hoʻoheheʻe ʻia i ka hui ʻana o ka waikawa nitric a me ka waikawa hydrofluoric, loaʻa iā ia ka antioxidant wela kiʻekiʻe kiʻekiʻe a hiki e hoʻohana ʻia e like me ke kiʻekiʻena kiʻekiʻe (& LT; Hoʻomehana mea hoʻomehana e hana ana i kahi lewa oxidizing ma 1700 ℃. I loko o ka lewa oxidizing, ua hoʻokumu ʻia kahi pale pale ma luna o ka aniani silica ʻeleʻele (SiO2) i puhi ʻia i ke kiʻekiʻe wela e pale ai i ka hana mau ʻana o ka molybdenum disilicate. Ke kiʻekiʻe ka mahana o ka mea hoʻomehana ma mua o 1700 ℃, hoʻokumu ʻia ke kiʻi ʻoniʻoni SiO2, i hoʻonui ʻia i ka 1710 ℃ a hoʻopili ʻia me
SiO2 i loko o nā kulu hoʻoheheʻe ʻia. Ma muli o ka neʻe ʻana o ka hoʻonui o ka ʻili, nalowale kona hiki ke pale. Ma lalo o ka hana o ka oxidant, ke hoʻohana mau ʻia ka mea, hana hou ia i kahi kiʻi ʻoniʻoni. Pono e hoʻomaopopo ʻia ma muli o ka ikaika o ka hoʻohaʻahaʻa ma nā mahana haʻahaʻa, ʻaʻole hiki ke hoʻohana ʻia ke kumumanaʻo no nā wā lōʻihi ma 400-700 is. Hoʻohana ʻia ka molildenum disilicide i loko o nā māla o nā mea pale pale anti-oxidation kiʻekiʻe loa, nā mea hoʻomehana uila, nā kiʻi uila electrode, nā pono hana, ka hoʻoikaika ʻana i nā mea hoʻohui, komo i nā mea kūpale, nā mea e pili ana i nā keramona hanana, a me nā mea ʻē aʻe.

1) ʻOihana ʻenehana ikehu: nā mea hoʻomehana uila, nā mea hoʻoliʻiliʻi wela kiʻekiʻe no nā hoʻoulu ʻana o ka atomic reactor, nā mea puhi kinoea, nā thermocouples wela kiʻekiʻe a me kā lākou mau paipu pale, ipu hao no nā mea hoʻoheheʻe (hoʻohana ʻia no ka hoʻoheheʻe ʻana i ka sodium, lithium, kēpau, bismuth, tin a me nā metala ʻē aʻe ).

2) ʻOihana Microelectronics: MoSi2 a me nā silicides metala refractory Ti5Si3, WSi2 a me TaSi2 he moho nui no ka GATE a me ka pili pilina lahilahi o LSI.

3) ʻoihana Aerospace: ʻImi ākea a hohonu a noi ʻia e like me nā mea hana pale antioxidant kiʻekiʻe. ʻO ke ʻano he ʻenekini turbine engine, e like me nā pahi, ka mea hoʻoheheʻe, ka mea puhi ahi, ka nīʻī a me ka mea e hoʻopaʻa ai i nā pono. nā mea kūkulu hoʻopili intermetallic e like me nā mea kūkulu i hoʻohana ʻia i nā kiʻekiʻena wela, nā mea puhi kinoea, nā nozzles, nā kānana wela kiʻekiʻe a me nā plug sparks no nā mokulele mokulele a me nā turbines gas automobile. ʻO ka mea nui keakea i kēia noi ʻo ia ka nui o ka brittleness ma ka mahana o ka lumi a me ka ikaika haʻahaʻa i ka mahana kiʻekiʻe. No laila, ʻo ka haʻahaʻa o ke ana wela a me ka hoʻonui ʻana i ka mahana o molybdenum disilicate nā ʻenehana nui no kāna noi ʻana ma ke ʻano he mea kūkulu. Hōʻike nā hopena i nā alloying a me ka hoʻopili ʻana i nā ala kūpono e hoʻomaikaʻi ai i ka paʻakikī a me ka ikaika o ka mahana wela o ka molibdenum disilicate i ka mahana wela o ka lumi. Hoʻohana ʻia nā ʻāpana i ka moly he mau silicide wale nō ka hoʻopili ʻana o ka bdenum disilicide alloying me ka hoʻopili like ʻana o ke aniani me molybdenum disilicide, e like me WSi2, NbSi2, CoSi2, Mo5Si3 a me Ti5Si3, i waena o ia ʻo WSi2 ka mea maikaʻi loa. maopopo leʻa nalowale, a ua kaupalena ʻia ka noi. Ua hōʻoia ʻia he kūpaʻa kūpona maikaʻi a me ka capacitivity o ka molibdenum disilicide me ka ʻaneʻane o nā mea e hoʻoikaika ai i ka ceramic (e like me SiC, TiC, ZrO2, Al2O3, TiB2, a pēlā aku).
No laila, ʻo ke ala kūpono e hoʻomaikaʻi ai i nā pono mechanical o molybdenum disilicate e hoʻomākaukau i ka molybdenum disilicate composite.


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