I ka pili ʻana i nā papa kaapuni paʻi, ʻaʻole hiki iā mākou ke poina i ke kuleana koʻikoʻi o nā mea kōkua.I kēia manawa, ʻo ka solder tin-lead solder a me ke lead-free solder.ʻO ka mea kaulana loa ʻo 63Sn-37Pb eutectic tin-lead solder, ʻo ia ka mea koʻikoʻi koʻikoʻi uila uila no kahi kokoke i 100 mau makahiki.
Ma muli o kona kūpaʻa oxidation maikaʻi ma ka lumi wela, ʻo ka tin kahi mea hoʻoheheʻe haʻahaʻa me kahi ʻano palupalu, a me ka ductility maikaʻi.ʻAʻole ʻo ke alakaʻi he metala palupalu wale nō me nā waiwai kemika paʻa, ka pale ʻana i ka oxidation, a me ka pale ʻana i ka corrosion, akā maikaʻi nō hoʻi ka moldability, a me ka castability, a maʻalahi hoʻi e hana a hoʻoheheʻe.ʻO ke kēpau a me ka tin he maikaʻi ka hoʻoheheʻe ʻana i kekahi.ʻO ka hoʻohui ʻana i nā ʻāpana like ʻole o ke kēpau i ka tin hiki ke hana i ka solder kiʻekiʻe, waena, a me ka wela haʻahaʻa.Ma keʻano kūikawā, 63Sn-37Pb eutectic solder i maikaʻi loa uila conductivity,, kemikala paʻa,, mechanical waiwai a me ka processability, haʻahaʻa hehee wahi a me kiʻekiʻe solder hui ikaika, he mea kūpono no ka uila soldering.No laila, hiki ke hoʻohui ʻia ka tin me ke kēpau, kālā, bismuth, indium a me nā mea metala ʻē aʻe e hana ai i ka solder wela kiʻekiʻe, waena a haʻahaʻa no nā noi like ʻole.
Nā waiwai kino a me kemika o ke tini
He metala alohilohi keʻokeʻo kālā keʻokeʻo me ke kūpaʻa maikaʻi i ka oxidation ma ka lumi wela a paʻa i kona luster ke ʻike ʻia i ka ea: me ka mānoanoa o 7.298 g/cm2 (15) a me kahi helu heheʻe o 232, he mea hoʻoheheʻe haʻahaʻa. me kahi ʻano palupalu a me ka ductility maikaʻi.
I. ʻO ke ʻano o ka hoʻololi ʻana o ka pae o ke tini
ʻO 13.2 ka helu hoʻololi o ka pae.ʻO ka pahu boron keʻokeʻo ma kahi mahana ʻoi aku ka kiʻekiʻe ma mua o ka pae hoʻololi;ke emi ka mahana ma mua o ka helu hoʻololi, hoʻomaka ia e lilo i pauda.Ke hoʻololi ʻia ka pae, e hoʻonui ʻia ka leo ma kahi o 26%.ʻO ka hoʻololi ʻana i ka pae wela haʻahaʻa e lilo ai ka solder i mea palupalu a aneane nalowale ka ikaika.ʻOi aku ka wikiwiki o ka hoʻololi ʻana o ka māhele ma kahi o -40, a ma nā mahana ma lalo o -50, hoʻololi ʻia ke kini metala i loko o ka pahu hina hina.No laila, ʻaʻole hiki ke hoʻohana ʻia ke kī maʻemaʻe no ka hui uila.
II.Ka waiwai kemika o ke tini
1. ʻO ka tin ka maikaʻi o ka corrosion kūpaʻa i ka lewa, ʻaʻole maʻalahi e nalowale i ka luster, ʻaʻole pili i ka wai, oxygen, carbon dioxide.
2. Hiki i ka tin ke pale aku i ka ʻino o nā ʻakika organik a he kūpaʻa kiʻekiʻe kona kūʻē ʻana i nā mea kū ʻole.
3. He metala amphoteric ka tin a hiki ke hoʻopili me nā ʻakika ikaika a me nā kumu, akā ʻaʻole hiki iā ia ke pale aku i ka chlorine, iodine, caustic soda a me ka alkali.
ʻAiʻino.No laila, no nā papa hui i hoʻohana ʻia i loko o nā wahi ʻawaʻawa, alkaline a me ka paʻakai paʻakai, pono kahi uhi anti-corrosion triple e pale i nā hui solder.
Aia nā pono a me nā pōʻino, ʻo ia nā ʻaoʻao ʻelua o ke kālā.No ka hana ʻana o PCBA, he mea nui e noʻonoʻo pehea e koho ai i ka solder tin-lead kūpono a i ʻole solder lead-free e like me nā huahana like ʻole i ka mana maikaʻi.
Ka manawa hoʻouna: Dec-21-2021