Kaʻina hana hoʻoheheʻe ʻana i ka pauka metala

ʻO ke ʻano no ka hoʻomākaukau ʻana i ka pauda ma ka hoʻokuʻi ʻana a i ʻole ka wāwahi ʻana i nā mea metala a i ʻole nā ​​​​mea hoʻoheheʻe ʻia i loko o nā kulu liʻiliʻi e ka wai e holo wikiwiki (atomizing medium) a laila e hoʻoheheʻe iā lākou i pauda paʻa. ʻO ka Atomization ke ala maikaʻi loa e hana ai i ka pauka i hoʻohuihui piha ʻia, i kapa ʻia ka pauka pre-alloyed. ʻAʻole wale kēlā me kēia ʻāpana o ka pauka i ke ʻano like ʻole o ka hui ʻana o ka mea hoʻoheheʻe ʻia, akā hoʻomaʻemaʻe hoʻi i ka hana crystalline ma muli o ka paʻa wikiwiki ʻana, a hoʻopau i ka macro-segregation o ka lua.

Hiki ke hoʻokaʻawale ʻia ke ʻano o ka atomization i ʻelua ʻano: ʻo ke "ʻano kahe ʻelua" (ka hoʻokahe ʻana i ka wai kahe e ka atomizing medium flow) a me ke ʻano "Single-flow method" (ka hoʻoheheʻe ʻana i ka wai alloy ma nā ʻano ʻē aʻe). 846 ka mua ua maheleia i ke kinoea (helium, noe, nitrogen, ea) a me ka wai (wai, aila) atomization medium, ka hope e like me centrifugal atomization a me ka dissolved kinoea vacuum atomization.

ʻO nā ala i hoʻohana nui ʻia ʻo ka atomization gas a me ka atomization wai. I ke kaʻina hana atomization, hoʻoheheʻe ʻia ka metala maka i loko o kahi wai hoʻoheheʻe kūpono (ʻoi aku ka wela 100 ~ 150 ° C) i loko o ka umu uila a i ʻole induction, a laila hoʻokomo ʻia i loko o kahi tundish aia ma luna o ka nozzle atomization. Kahe ka wai huila mai ka lua lalo o Tundish, a ua ʻātoma ʻia i loko o nā kulu liʻiliʻi i ka wā e hui ai me ka ea kiʻekiʻe a i ʻole ke kahe wai ma o ka nozzle. Ma keʻano laulā, he poepoe ke kinoea inert atomized powder particles me ka haʻahaʻa o ka oxygen content (ma lalo o L00 × 10) a hiki ke hana ʻia i huahana densified pololei e nā ʻenehana thermoforming e like me ke kaomi isostatic wela. ʻO ka hapa nui o ka wai atomized pauka particles irregular shape, kiʻekiʻe oxygen maʻiʻo (ma luna o 600 × 10) a pono e annealed, akā maikaʻi lākou compressibility a hiki ke hana ʻia e ke kaomi anu a laila sintered i loko o nā ʻāpana mechanical.

ʻO ke ʻano atomization i ʻōlelo ʻia ma luna nei he maʻalahi ka hana ʻana i nā mea nui, akā no ka mea ua pili ka wai hoʻoheheʻe me ka slag a me Refractory crucible, ʻaʻole hiki ke hoʻokomo ʻia nā inclusions non-metallic i ka pauka hopena. No laila, e like me ke kumu ESR, ua hoʻololi mua ʻo Soderfors Powder Company o Suedena i ka Tundish me ka mana o 7 T i kahi mea ESR (electroslag heating), ua hoʻemi ʻia ka ʻike o nā non-metallic inclusions i loko o ka pauka o ke kila kiʻekiʻe e ka atomization nitrogen i 1/10 o ka ʻike kumu, a ua hoʻonui ʻia ka ikaika kulou o ka ASP pauka ma luna o 040MPa0MPa0MPa0MPa0MPa0MPa0 MPa.

ʻO ke ana e pale aku ai i ka hoʻohaumia ʻana o ka oxide, ʻo ia ka hoʻohana ʻana i ke ʻano atomization "Single-flow", no ka laʻana, rotating electrode atomization method (e nānā i ka rotating electrode method). Eia kekahi, aia kahi ʻano hana atomization hoʻonā hiki ke hana i ka pauka spherical kiʻekiʻe. ʻO ke kumu: i ka wā e hōʻike koke ʻia ai ke kinoea supersaturated alloy ma lalo o ke kaomi ʻana i ka vacuum, e pakele ke kinoea hoʻoheheʻe ʻia a hoʻonui ʻia, e hoʻoulu ai i ka atomization wai, a laila condensed i pauka. No ka nickel, copper, cobalt, iron and aluminum matrix alloys, hiki ke hoʻohana i ke ʻano o ka hoʻoheheʻe ʻana i ka hydrogen e hoʻokō ai i ka pauka atomization gas i hoʻoheheʻe ʻia.