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.
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: Iune-19-2023