ʻO ka pāpaʻi koʻikoʻi i hoʻokumu ʻia i ka Cobalt he mea paʻa paʻa e hiki ke kū i nā ʻano ʻano like ʻole o ka ʻaʻahu, corrosion a me ka wela wela. Hoʻokumu ʻia nā ʻāpana kobalt ma luna o ka cobalt e like me ka mea nui, i loaʻa ka nui o ka nickel, alloying chemical elements e like me chromium, tungsten a me kahi liʻiliʻi o nā mea hoʻohui e like me molybdenum, niobium, tantalum, titanium, lanthanum, a i kekahi manawa hao. . E like me ka ʻokoʻa o ka hui ʻana, hiki ke hoʻohana ʻia ka pāpaʻi cobalt-based i ke kaula kuʻi, a hiki ke hoʻohana ʻia ka pauka no ka hoʻopaʻa ʻana i ka ʻili paʻakikī, ka hoʻoulu ʻana i ka wela, ka hoʻoulu ʻana a me nā kaʻina hana ʻē aʻe, a hiki ke hana ʻia i loko.hoolei ana, forgings a me nā ʻāpana metallurgy pauda. Hoʻokaʻawale ʻia e ka hoʻohana hope ʻana, hiki ke hoʻokaʻawale ʻia nā mea hoʻoheheʻe ʻia i ka cobalt i loko o nā ʻāpana ʻaʻahu kūʻokoʻa i hoʻokumu ʻia i ka cobalt. Ma nā kūlana hana maʻamau, ʻaʻole lākou i ʻaʻahu a me ka wela kiʻekiʻe a i ʻole nā pale a me nā corrosion. Pono paha kekahi mau hana hana i ka wela kiʻekiʻe, ka ʻaʻahu a me ka pale ʻana i ka corrosion i ka manawa like. ʻOi aku ka paʻakikī o nā kūlana hana, ʻoi aku ka maikaʻi o nā pono o nā alloys-based cobalt.
ʻO nā waiwai o nā Alloy Cobalt-Based
ʻO nā carbide nui i loko o nā superalloys pili i ka cobalt ʻo MC, M23C6 a me M6C. I loko o nā ʻāpana kobalt i hoʻolei ʻia, ua hoʻoheheʻe ʻia ka M23C6 ma waena o nā palena palaoa a me nā dendrites i ka wā hoʻomaha mālie. I kekahi mau alalai, hiki i ka M23C6 maikaʻi ke hana i kahi eutectic me ka matrix γ. ʻO nā ʻāpana carbide MC he nui loa e loaʻa i kahi hopena koʻikoʻi i nā dislocations, no laila ʻaʻole maopopo ka hopena hoʻoikaika i ka alloy, ʻoiai nā carbide i hoʻopuehu maikaʻi i ka hopena hoʻoikaika maikaʻi. Hiki i nā carbide ma ka palena o ka palaoa (ʻo M23C6 ka nui) ke pale i ka paheʻe o ka palena o ka palaoa, a laila e hoʻomaikaʻi ai i ka ikaika hoʻomanawanui. ʻO ka microstructure o ka cobalt-based superalloy HA-31 (X-40) he māhele hoʻoikaika hoʻopuehu (CoCrW)6 C-type carbide. ʻO nā ʻāpana topological kokoke i hoʻopili ʻia e ʻike ʻia i loko o kekahi mau ʻāpana kobalt, e like me ke ʻano sigma he mea pōʻino a hoʻoheheʻe i ka alloy.
ʻOi aku ka maikaʻi o ke kūpaʻa wela o nā carbide i loko o nā ʻāpana kobalt. Ke piʻi ka mahana, ʻoi aku ka lohi o ka ulu ʻana o ka hōʻiliʻili carbide ma mua o ka ulu ʻana o ka pae γ i ka nickel-based alloy, a ʻoi aku ka kiʻekiʻe o ka mahana o ka hoʻoheheʻe hou ʻana i ka matrix (a hiki i 1100 ° C) . No laila, i ka pi'i 'ana o ka mahana, ka ho'oha'aha'a 'ana i ka cobalt e emi mālie ana ka ikaika o ka huila. Loaʻa i nā kobalt-based alloys maikaʻi ke kūʻē i ka corrosion thermal. ʻO ke kumu i ʻoi aku ai ka maikaʻi o nā alloys pili i ka cobalt ma mua o nā nickel-based alloys ma kēia ʻano, ʻo ka helu heheʻe o ka cobalt sulfide (e like me Co-Co4S3 eutectic, 877 ℃) ʻoi aku ka kiʻekiʻe ma mua o ka nickel ( No ka laʻana, Ni-Ni3S2 eutectic (645°C) kiʻekiʻe, a ʻoi aku ka haʻahaʻa o ka diffusion o ka sulfur i loko o ka cobalt ma mua o ka nickel ʻOi aku ka nui o ka chromium ma mua o ka nickel-based alloys, hiki iā lākou ke hana i kahi papa pale o ka alkali metala sulfate (e like me ka Cr2O3 pale pale i hoʻopili ʻia e Na2SO4) ma ka ʻili o ka mea hoʻohui ʻOi aku ka haʻahaʻa loa o nā alloys ma mua o nā alloys nickel-based.
ʻOkoʻa mai nā superalloys ʻē aʻe, ʻaʻole i hoʻoikaika ʻia nā superalloys hoʻokumu ʻia i ka cobalt e kahi ʻāpana ua i kauoha ʻia i hoʻopaʻa paʻa ʻia i ka matrix, akā ua haku ʻia me kahi matrix austenite fcc i hoʻoikaika ʻia ka hopena paʻa a me kahi ʻāpana carbide i puʻunaue ʻia i loko o ka matrix. ʻO ka hoʻolei ʻana i nā superalloys pili i ka cobalt e hilinaʻi nui i ka hoʻoikaika carbide. Loaʻa i nā kristal kobalt maʻemaʻe kahi hale aniani hexagonal kokoke i hoʻopili ʻia (hcp) ma lalo o 417°C, e hoʻololi ana i fcc i nā wela kiʻekiʻe. I mea e pale aku ai i kēia hoʻololi ʻana i ka wā o ka hoʻohana ʻana i nā superalloys hoʻokumu ʻia i ka cobalt, ua hoʻohui ʻia nā mea hoʻoheheʻe kobalt a pau me ka nickel i mea e hoʻopaʻa ai i ka hale mai ka wela lumi a hiki i ka wela wela. He pilina koʻikoʻi-mehana ka haʻihaʻi haʻihaʻi ʻana o nā kobalt-based alloys, akā hōʻike i ke kūpaʻa ʻana o ka wela wela ma luna o 1000°C ma mua o nā wela kiʻekiʻe ʻē aʻe.
ʻO ka hoʻoulu ʻana i ka wela o nā Alloys-Cobalt
ʻO ka nui a me ka hāʻawi ʻana i nā ʻāpana carbide a me ka nui o ka palaoa i loko o nā ʻāpana kobalt e pili pono i kakaʻina hoʻolei. I mea e hoʻokō ai i ka ikaika hoʻomanawanui a me nā waiwai luhi wela o nā ʻāpana hoʻoheheʻe ʻana i ka cobalt-based alloy casting, pono e hoʻomalu ʻia nā ʻāpana kaʻina hana. Pono nā ʻāpana Cobalt e mālama i ka wela, ka mea nui e kāohi i ka ua o ka carbide. No ka hoʻoheheʻe ʻia ʻana o ka cobalt, e hoʻokō mua i ka hoʻoponopono paʻa paʻa wela kiʻekiʻe, maʻamau ma kahi o 1150°C, no laila e hoʻoheheʻe ʻia nā carbides mua a pau, me kekahi MC-type carbide, i mea paʻa; a laila, lawe ʻia ka mālama ʻelemakule ma 870-980 ° C. E hoʻokahe hou i nā carbide.
Nā Papa Maʻamau o nā Alloys-Cobalt
ʻO nā māka maʻamau o nā ʻāpana wela kiʻekiʻe e pili ana i ka cobalt: 2.4778 (e like me DIN EN 10295) Hayness 188, Haynes 25 (L-605), Alloy S-816, UMCo-50, MP-159, FSX-414, X -40, Stellite 6B, Papa 31, a me nā mea ʻē aʻe, ʻo nā hōʻailona Kina: GH5188 (GH188), GH159, GH605, K640, DZ40M a pēlā aku.
Noi o ka Cobalt-based Alloy Castings
ʻO ka maʻamau, nele nā superalloys i hoʻokumu ʻia i ka cobalt i nā hana hoʻoikaika koʻikoʻi. ʻOiai he haʻahaʻa ka ikaika ma ka mahana wela (ʻo 50-75% wale nō o nā alloys nickel-based), ʻoi aku ka ikaika o lākou, ke kūpaʻa luhi wela maikaʻi, ke kūpaʻa abrasion, ʻoi aku ka maikaʻi o ka weldability and thermal corrosion resistance ma luna o ka mahana o 980 ° C. No laila, ʻo ka hoʻoheheʻe ʻana o ka cobalt-based alloy he mea kūpono ia no ka hana ʻana i nā vanes alakaʻi a me nā nozzle guide vanes no nā ʻenekini mokulele mokulele, nā turbine kinoea ʻenehana, nā turbine kinoea moana, a me nā nozzles engine diesel, etc.
Ka manawa hoʻouna: Mei-05-2021