Reaction-sintered silicon carbide porcelain i ka ikaika compressive maikaʻi ma ambient wela, wela ke kū'ē i ka ea oxidation, maikaʻi lole pale pale, maikaʻi wela kū'ē, liʻiliʻi liʻiliʻi o ka hoʻonui laina, kiʻekiʻe wela hoʻololi coefficient, kiʻekiʻe paakiki, wela kū'ē a me ka luku, ahi pale a me nā hiʻohiʻona kiʻekiʻe ʻē aʻe. Hoʻohana nui ʻia i loko o nā kaʻa, mechanical automation, ecological environmental protection, aerospace engineering, information content electronic devices, power energy and other fields, ua lilo i kumu kūʻai-effective a irreplaceable structural ceramics i nā ʻoihana ʻoihana he nui.
Ua ʻike ʻia ʻo Pressureless sintering ma ke ʻano he ʻano calcination SiC. No nā mīkini hoʻolei hoʻomau ʻokoʻa, hiki ke hoʻokaʻawale ʻia ka sintering paʻi ʻole i ka calcination paʻa a me ka calcination wai hana kiʻekiʻe. Ma ka hoʻohui ʻana i ka B a me C (maʻiʻo oxygen ma lalo o 2%) i hui pū ʻia i loko o kahi pauka Beta SiC maikaʻi loa, ua hoʻopaʻa ʻia ʻo S. Proehazka i loko o kahi kino calcined SIC me ka nui o ka nui ma mua o 98% ma 2020, me Al2O3 a me Y2O3 mea hoʻohui. Calcined 0.5m-SiC ma lalo o 1850-1950 (particle ili me ka liʻiliʻi SiO2), ʻo ka hopena ʻo ka nui o ka porcelain SiC i ʻoi aku ma mua o 95% o ke kumu theoretical density, liʻiliʻi ka nui o ka palaoa, a he nui ka nui o ka awelika. he 1.5μm.
ʻO ka reactive sintering silicon carbide e pili ana i ke kaʻina holoʻokoʻa o ka noʻonoʻo ʻana i ka porous structure billet me ka wai wai a i ʻole ka hana wai kiʻekiʻe, e hoʻomaikaʻi i ka maikaʻi o ka billet, e hōʻemi ana i ka puka makani, a me ka calcining i ka huahana i hoʻopau ʻia me kahi ikaika a me ka pololei. Hoʻohui ʻia ka pauka Plutonium-sic a me ka graphite maʻemaʻe kiʻekiʻe i kekahi ʻāpana a hoʻomehana ʻia a hiki i 1650 e hana i ka embryo lauoho. I ka manawa like, komo a komo i loko o ke kila ma o ka pae wai Si, e hōʻike ana me ka silicon carbide e hana i ka plutonium-sic, a hui pū me nā ʻāpana plutonium-sic. Ma hope o ka infiltration Si, hiki ke loaʻa ke kino sintered me ka kiko kikoʻī pili a me ka nui unpacked. Ke hoʻohālikelike ʻia me nā ʻano sintering ʻē aʻe, i ke kaʻina hana o ke kiʻekiʻe kiʻekiʻe o ka hoʻololi ʻana i ka nui o ka hoʻololi ʻana he liʻiliʻi liʻiliʻi, hiki ke hana i ka nui kūpono o nā waiwai, akā aia ka nui o SiC ma ke kino calcined, nā hiʻohiʻona kiʻekiʻe o ka hopena sintered SiC porcelain. e oi aku ka ino. ʻO nā seramika SiC i hoʻopaʻa ʻole ʻia me ke kaomi ʻole, nā seramika SiC calcined isostatic wela a me nā seramika SiC i hoʻopaʻa ʻia i ka hopena he mau ʻano ʻokoʻa.
ʻO nā mea hana carbide sintering reactive: No ka laʻana, SiC porcelain ma ke kiʻekiʻe o ka calcined pili pili a me ka ikaika kulou, ʻoi aku ka nui o ka sintering wela a me ka calcination kaomi isostatic wela, a ʻoi aku ka haʻahaʻa o ka sintering reactive SiC. I ka manawa like, hoʻololi nā waiwai kino o SiC porcelain me ka hoʻololi o ka hoʻololi calcination. ʻO ka sintering non-pressure, hot press sintering a me ka hopena sintering o SiC porcelain he maikaʻi ke kūpaʻa alkaline a me ka pale ʻana i ka waika, akā ʻo ka hopena sintered SiC porcelain ua nāwaliwali ke kūʻē i ka HF a me nā mea ʻawaʻawa ikaika loa. Ke emi iho ka mahana ambient ma mua o 900, ʻoi aku ka kiʻekiʻe o ka ikaika kulou o ka nui o ka SiC porcelain ma mua o ke kiʻekiʻe o ka porcelain sintered kiʻekiʻe, a hāʻule ka ikaika kulou o ka reactive sintered SiC porcelain i ka wā i ʻoi aku i ka 1400. hāʻule i ka ikaika wili o kekahi nui o ke aniani laminated Si ma mua o kekahi mahana i loko o ke kino calcined Ka hana wela kiʻekiʻe o SiC ʻO nā ceramics i hoʻopaʻa ʻia me ka ʻole o ke kaomi calcination a ma lalo o ke kaomi static mau loa e pili nui ʻia e nā ʻano mea hoʻohui.
Ka manawa hoʻouna: Iune-19-2023