He aha ke ʻano hana microscopic o ka emi ʻana o ka nui maoli i hoʻokumu ʻia e ka "overburning" i ka wā o ka calcination?

I ka wā o ke kaʻina hana calcination, ʻo ke ʻano microscopic e alakaʻi ai ka "overburning" i ka emi ʻana o ka density maoli e pili nui ana i ka oxidation palena palaoa a i ʻole ka heheʻe ʻana, ka ulu ʻana o ka palaoa maʻamau ʻole, a me ka hōʻino ʻana o ke kūkulu ʻana, e like me ka mea i kālailai ʻia ma lalo nei:

1. ʻO ka hoʻokahe ʻana o ka palena palaoa a i ʻole ka heheʻe ʻana: Ka nalowale ʻana o ka ikaika o ka hoʻopaʻa intergranular
   Ka hoʻokumu ʻana o nā pae eutectic haʻahaʻa-heʻe: Ke ʻoi aku ka mahana o ka calcination ma mua o ke kiko heʻe o nā eutectics haʻahaʻa-heʻe i loko o ka mea, makemake nui ka ʻano eutectic ma nā palena o ka palaoa e heheʻe, e hana ana i kahi pae wai. No ka laʻana, i loko o nā mea hoʻohuihui alumini, hiki ke hana ʻia nā spheres i hoʻoheheʻe hou ʻia a i ʻole nā ​​​​wahi triangular i hoʻoheheʻe hou ʻia, ʻoiai i loko o nā kila kalapona, hiki ke hana ʻia ka oxidation palena o ka palaoa a i ʻole ka heʻe kūloko.
   Ke komo ʻana o nā kinoea oxidizing: I nā mahana kiʻekiʻe, hoʻolaha nā kinoea oxidizing (e like me ka oxygen) i nā palena o ka palaoa a pane pū me nā mea i loko o ka mea, e hana ana i nā oxides. Hoʻonāwaliwali hou kēia mau oxides i ka ikaika o ka hoʻopaʻa ʻana intergranular, e alakaʻi ana i ka hoʻokaʻawale ʻana o ka palaoa.
   Poino kūkulu: Ma hope o ka heheʻe ʻana o ka palena o ka palaoa a i ʻole ka oxidation, emi nui ka ikaika o ka hoʻopaʻa ʻana o ka intergranular, e hopena ana i ka hoʻokumu ʻia ʻana o nā microcracks a i ʻole nā ​​​​pores i loko o ka mea. Hoʻemi kēia i ka nuipa kūpono no kēlā me kēia anakahi leo, e alakaʻi ana i ka emi ʻana o ka density maoli.
2. Ka ulu ʻana o ka palaoa maʻamau ʻole: Ka hoʻonui ʻia o nā kīnā kūloko
   ʻO ka ʻāwiliwili ʻana o ka palaoa ma muli o ka wela nui ʻana: Hoʻopili pinepine ʻia ka puhi nui ʻana me ka wela nui ʻana, kahi e ulu wikiwiki ai nā ʻano palaoa austenite i nā mahana wela kiʻekiʻe loa a i ʻole nā ​​manawa paʻa lōʻihi. No ka laʻana, hiki i nā kila kalapona ke hoʻomohala i nā ʻano Widmanstätten ma hope o ka puhi nui ʻana, ʻoiai hiki i nā kila mea hana ke hana i ka ledeburite e like me ka iwi iʻa.
   Hoʻonui ʻia nā kīnā kūloko: Hiki i nā hua ʻāpala ke loaʻa nā hemahema hou aʻe e like me nā dislocations a me nā hakahaka, kahi e hōʻemi ai i ka nui o ka mea. Eia kekahi, hiki ke hana ʻia nā pores kinoea a i ʻole nā ​​​​microcracks i ka wā o ka ulu ʻana o ka hua, e hōʻemi hou ana i ka nuipa ma kēlā me kēia anakahi leo.
   Ka emi ʻana o ka nuipaʻa kūpono: ʻO ka ulu ʻana o ka palaoa maʻamau ʻole e alakaʻi i kahi ʻano kūloko palupalu i loko o ka mea, e hoʻohaʻahaʻa ana i ka nuipaʻa kūpono no kēlā me kēia anakahi leo a pēlā e hopena ai i ka emi ʻana o ka nui maoli.
3. Ka pōʻino microstructural: Ka hōʻino ʻana o nā waiwai mea
   Nā poepoe i hoʻoheheʻe hou ʻia a me nā wahi i hoʻoheheʻe hou ʻia ʻekolu ʻāpana: I loko o nā hui alumini a me nā mea ʻē aʻe, hiki i ka puhi nui ʻana ke alakaʻi i ka hoʻokumu ʻia ʻana o nā poepoe i hoʻoheheʻe hou ʻia a i ʻole nā ​​​​wahi i hoʻoheheʻe hou ʻia ʻekolu ʻāpana ma nā palena o ka palaoa. ʻO ke alo o kēia mau wahi e hoʻopilikia i ka hoʻomau o ka mea a hoʻonui i ka porosity.
   Ka hoʻonui ʻia ʻana o ka palena o nā hua a me nā māwae liʻiliʻi: Ma hope o ke kuni nui ʻana, hiki ke hoʻonui ʻia nā palena o nā hua ma muli o ka oxidation a i ʻole ka heheʻe ʻana, me ka hoʻokumu ʻia ʻana o nā māwae liʻiliʻi. Hiki i kēia mau māwae liʻiliʻi ke komo i loko o ka mea, e alakaʻi ana i ka emi ʻana o ka nui maoli.
   ʻAʻole hiki ke hoʻi hou ʻia nā waiwai: ʻO ka pōʻino microstructural i hana ʻia e ka overburning he mea hiki ʻole ke hoʻi hou ʻia, a ʻoiai ʻo ka mālama wela ma hope aku ʻaʻole paha e hoʻihoʻi piha i ka nui mua o ka mea.
   Nā laʻana a me ka hōʻoia
   Ke puhi nui ʻana o nā mea hoʻohuihui alumini: Ke ʻoi aku ka mahana wela o nā mea hoʻohuihui alumini ma mua o ko lākou mahana eutectic haʻahaʻa, e ʻāwili a heheʻe paha nā palena o ka palaoa, e hana ana i nā poepoe i hoʻoheheʻe hou ʻia a i ʻole nā ​​​​wahi triangular i hoʻoheheʻe hou ʻia. ʻO ke alo o kēia mau wahi e hōʻemi nui i ka nui maoli o ka mea me ka hoʻoulu ʻana i ka emi nui o nā waiwai mechanical.
   ʻO ke kuni nui ʻana o nā kila kalapona: Ma hope o ke kuni nui ʻana, hiki i nā kila kalapona ke hana i nā mea inclusion e like me ka iron oxide a i ʻole manganese sulfide ma nā palena o ka palaoa, kahi e hoʻonāwaliwali ai i ka ikaika o ka hoʻopaʻa ʻana intergranular a alakaʻi i ka hoʻokaʻawale ʻana o ka palaoa. Eia kekahi, hiki i ke kuni nui ʻana ke hoʻoulu i ka hoʻokumu ʻia ʻana o nā ʻano Widmanstätten, e hoʻemi hou ana i ka nui o ka mea.