Reaction-sintered silicon carbide porcelain i ka ikaika compressive maikaʻi ma ka ambient wela, wela ke kū'ē i ka ea oxidation, maikaʻi kāʻei kū'ē, maikaʻi wela kū'ē, liʻiliʻi liʻiliʻi o ka hoʻonui laina, kiʻekiʻe wela hoʻololi coefficient, kiʻekiʻe paʻakikī, wela a me ka luku, pale ahi a me nā ʻano kiʻekiʻe kiʻekiʻe. 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 kahi pānaʻi pili ʻoi aku ma mua o 98% ma 2020, me Al2O3 a me Y2O3 i mea hoʻohui. Calcined 0.5m-SiC ma lalo o 1850-1950 (particle ili me ka uuku SiO2), i ka hopena, ua oi aku ka nui o ka porcelain SiC ma mua o 95% o ke kumu theoretical density, he liʻiliʻi ka nui o ka palaoa, a he nui ka awelika, ʻo ia ka 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 hoʻokomo ʻana o 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, hiki ke hana i ka nui kūpono o nā waiwai, akā aia ka nui o SiC ma ke kino calcined, ʻoi aku ka ʻino o nā hiʻohiʻona kiʻekiʻe o ka sintered SiC porcelain. 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 wela kiʻekiʻe o ka porcelain sintered, a ʻo ka ikaika kulou o ka reactive sintered SiC porcelain e hāʻule loa i ka wā i ʻoi aku ma mua o 1400. 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: Nov-07-2023