Loaʻa i nā keramika carbide Silicon ka ikaika wela kiʻekiʻe, ke kūpaʻa ʻana i ka oxidation wela kiʻekiʻe, ke kūpaʻa maikaʻi o ka ʻaʻahu, ke kūpaʻa wela maikaʻi, ka coefficient liʻiliʻi o ka hoʻonui wela, ke alakaʻi wela kiʻekiʻe, ka paʻakikī kiʻekiʻe, ke kūpaʻa haʻalulu wela, ke kūpaʻa ʻana i ka corrosion kemika a me nā waiwai maikaʻi ʻē aʻe. Ua hoʻohana nui ʻia i ke kaʻa, ka mīkini, ka palekana o ke kaiapuni, ka ʻenehana aerospace, nā uila ʻike, ka ikehu a me nā kahua ʻē aʻe, a ua lilo i keramika kūkulu pono ʻole me ka hana maikaʻi loa ma nā kahua ʻoihana he nui. I kēia manawa e hōʻike aku wau iā ʻoe!
Sintering kaomi ʻole
ʻO ka sintering kaomi ʻole ka mea i manaʻo ʻia ʻo ia ke ʻano hoʻohiki nui loa no ka sintering SiC. Wahi a nā ʻano hana sintering like ʻole, hiki ke hoʻokaʻawale ʻia ka sintering kaomi ʻole i ka sintering pae paʻa a me ka sintering pae wai. Ma o ka ultra-fine β- A ka nui kūpono o B a me C (ʻoi aku ka nui o ka oxygen ma mua o 2%) i hoʻohui ʻia i ka pauka SiC i ka manawa like, a ua sintered ʻia ʻo s. proehazka i ke kino sintered SiC me ka density kiʻekiʻe ma mua o 98% ma 2020 ℃. A. Mulla et al. Ua hoʻohana ʻia ʻo Al2O3 a me Y2O3 ma ke ʻano he mau mea hoʻohui a sintered ma 1850-1950 ℃ no 0.5 μm β-SiC (loaʻa i ka ʻili o ka ʻāpana kahi liʻiliʻi o SiO2). ʻOi aku ka nui o ka density pili o nā keramika SiC i loaʻa ma mua o 95% o ka density theoretical, a he liʻiliʻi ka nui o ka palaoa a me ka nui awelika. He 1.5 microns.
Sintering kaomi wela
Hiki ke sintered ʻia ka SiC maʻemaʻe me ka compactly ma ka mahana kiʻekiʻe loa me ka ʻole o nā mea hoʻohui sintering, no laila nui ka poʻe e hoʻokō i ke kaʻina hana sintering wela no SiC. Nui nā hōʻike e pili ana i ka sintering kaomi wela o SiC ma ka hoʻohui ʻana i nā mea kōkua sintering. Ua aʻo ʻo Alliegro et al. i ka hopena o ka boron, alumini, nickel, hao, chromium a me nā mea hoʻohui metala ʻē aʻe ma ka densification SiC. Hōʻike nā hopena ʻo ka alumini a me ka hao nā mea hoʻohui kūpono loa e hoʻolaha i ka sintering kaomi wela SiC. Ua aʻo ʻo FFlange i ka hopena o ka hoʻohui ʻana i ka nui like ʻole o Al2O3 ma nā waiwai o ka SiC i kaomi wela. Ua manaʻo ʻia ʻo ka densification o ka SiC i kaomi wela e pili ana i ke ʻano o ka hoʻoheheʻe ʻana a me ka precipitation. Eia nō naʻe, hiki i ke kaʻina hana sintering kaomi wela ke hana i nā ʻāpana SiC me ke ʻano maʻalahi. ʻO ka nui o nā huahana i hana ʻia e ke kaʻina hana sintering kaomi wela hoʻokahi he liʻiliʻi loa ia, ʻaʻole ia he mea kūpono i ka hana ʻoihana.
Sintering kaomi isostatic wela
I mea e lanakila ai i nā hemahema o ke kaʻina hana sintering kuʻuna, ua hoʻohana ʻia ke ʻano B a me ke ʻano C ma ke ʻano he mau mea hoʻohui a ua hoʻohana ʻia ka ʻenehana sintering kaomi isostatic wela. Ma 1900 ° C, ua loaʻa nā keramika crystalline maikaʻi me ka density ʻoi aku ma mua o 98, a hiki i ka ikaika kulou ma ka mahana o ka lumi ke hiki i 600 MPa. ʻOiai hiki i ka sintering kaomi isostatic wela ke hana i nā huahana pae paʻa me nā ʻano paʻakikī a me nā waiwai mechanical maikaʻi, pono e sila ʻia ka sintering, he mea paʻakikī ke hoʻokō i ka hana ʻoihana.
Hoʻoheheʻe hopena
ʻO ka reaction sintered silicon carbide, i ʻike ʻia hoʻi ʻo self-bonded silicon carbide, e pili ana i ke kaʻina hana e hana ai ka porous billet me ke kinoea a i ʻole ka wai e hoʻomaikaʻi i ka maikaʻi o ka billet, e hōʻemi i ka porosity, a me nā huahana i hoʻopau ʻia me ka ikaika a me ka pololei o ka dimensional. E lawe i ka pauka α-SiC a me ka graphite i hui ʻia ma kahi ʻāpana a hoʻomehana ʻia a hiki i kahi 1650 ℃ e hana i kahi billet square. I ka manawa like, komo a komo paha i loko o ka billet ma o ke kinoea Si a hana me ka graphite e hana i ka β-SiC, i hui pū ʻia me nā ʻāpana α-SiC e kū nei. Ke komo piha ʻia ʻo Si, hiki ke loaʻa ke kino sintered reaction me ka density piha a me ka nui ʻaʻole e emi. Ke hoʻohālikelike ʻia me nā kaʻina hana sintering ʻē aʻe, he liʻiliʻi ka loli o ka nui o ka reaction sintering i ke kaʻina densification, a hiki ke hoʻomākaukau ʻia nā huahana me ka nui pololei. Eia nō naʻe, ʻo ka loaʻa ʻana o ka nui o SiC i loko o ke kino sintered e hoʻonui ai i nā waiwai wela kiʻekiʻe o nā keramika SiC sintered reaction.
Ka manawa hoʻouna: Iune-08-2022