Mai ka hiʻohiʻona o nā kumu ʻekolu e hoʻoholo ai i nā waiwai o nā huahana PTFE - ke kaumaha molecular, crystallinity a me ka voidage, ua hoʻopilikia nui ʻia ka voidage e ka preforming pressure, a me ka molecular kaumaha a me ka crystallinity e hoʻololi ʻia me nā kūlana sintering ʻokoʻa.No laila,kaʻina hana sinteringHe kuleana koʻikoʻi nā kūlana i nā waiwai hope o nā huahana e like me ka density, paʻakikī, permeability a me nā waiwai mechanical.
Mai ka hiʻohiʻona o nā kumu ʻekolu e hoʻoholo ai i nā waiwai o nā huahana PTFE - ke kaumaha molecular, crystallinity a me ka voidage, ua hoʻopilikia nui ʻia ka voidage e ka preforming pressure, a me ka molecular kaumaha a me ka crystallinity e hoʻololi ʻia me nā kūlana sintering ʻokoʻa.No laila, he mea koʻikoʻi nā kūlana kaʻina hana sintering i nā waiwai hope o nā huahana e like me ka density, paʻakikī, permeability a me nā waiwai mechanical.
Ua ʻike ʻo Wang ping i kakaʻina hana sintering o PTFEua hoʻopilikia ʻia e ka piʻi ʻana a me ka hāʻule ʻana o ka wikiwiki, ka mahana sintering a me ka manawa sintering.ʻO ka nui o ka huahana, ʻoi aku ka lohi o ka piʻi ʻana a me ka hoʻoilo, ʻoi aku ka lōʻihi o ka manawa sintering.ʻOi aku ka kiʻekiʻe o ka mahana sintering o ka resin suspension ma mua o ka dispersion resin.ʻOi aku ka kiʻekiʻe o ka mahana sintering o nā huahana maʻemaʻe ma mua o nā huahana i hoʻopiha ʻia.Ma keʻano laulā, ʻoi aku ka wikiwiki o ka hoʻomehana ʻana ma mua o ka wikiwiki o ka hoʻoilo.I loko o ka umu sintering hoʻokahi, ʻaʻole hiki ke hui pū ʻia nā mea maʻemaʻe a me nā huahana hoʻopiha;ʻAʻole hiki ke hoʻohui ʻia nā huahana me nā kūlana sintering like ʻole.ʻAʻole hiki ke hui pū ʻia nā huahana o nā mea maka.Ke lawe nei i ka hana o 3-layer molded circular plate me ke anawaena o 1 m, manoanoa o 20 mm, papalua papalua e like me ka ptfe maemae a me ka papa waena e like me ka piha ptfe e like me ka laʻana, ka ikaika hoʻopiʻi, ka ikaika kulou, ka paʻakikī a me nā pono mechanical o ka circular laminated plate i hana ʻia e kēia ʻenehana i hoʻomaikaʻi nui ʻia.
Ua aʻo ʻo Liu xianlan i nā hiʻohiʻona kaʻina hana, ke ʻano hana a me nā hiʻohiʻona hoʻolālā mold o PTFE, nānā i nā hemahema a me nā kumu o nā huahana PTFE i hana ʻia e ke kaomi anu a me ka sintering, a waiho i nā ʻano lapaʻau.Hiki ke hoʻoheheʻe ʻia ka PTFE e nā ʻano hana preforming like ʻole, e like me ka hoʻoheheʻe ʻana, extrusion, hydraulic molding, push molding a me ke kiʻekiʻe o ka hana ʻana, a laila sintered i ka huahana hope. ʻO ka nui o ka hoʻoheheʻe ʻana ʻo PTFE i hana ʻia me ka resin hoʻomaha.Ke emi ka mānoanoa o ka pepa ma lalo o 1.5mm, hoʻohana ʻia ka resin disperse.ʻO kāna kaʻina hana ʻenehana: resin - sieve (suspension resin ma hope o ke kuʻi ʻana, wehe, a me ka 20 mesh mesh sieve) - kaomi (PTFE pauka e hoʻouka ana i ka mold ma lalo o ke kaomi mai 20 a 35 MPa, ma hope o ka hoʻokumu ʻana i ka compaction) - sintering (ma 370 ~ 380). "C wela sintering i ka sintering furnace) - i hoʻoheheʻeʻia nā huahana (ma lalo o ka moku'āina kūʻokoʻa i loko o ka mold a iʻole ma hope o ka hoʻomahaʻana e hoʻopau i ka hoʻolālā e like me ka mea i makemakeʻia e ka papa, nā koʻokoʻo, nā paipu, nā pahu a me nā huahana packing, etc.). ʻO ke ʻano equilibrium a i ʻole ka hoʻoheheʻe ʻana i ka lāʻau i loko o kāna kaʻina hana: e hoʻokomo i ka ʻeke ʻōpala i loko o ka make - pili i ka paila wai, hoʻopiha i ka wai e pehu i ka ʻeke ʻeke i loko o ka cylindrical - hui like ka resin ma waena o ka ʻeke a me ka pani ʻana o ka polū waho - hoʻomau i ka hoʻonui mālie ʻO ke kaomi wai, hoʻopiha wai a hiki i ka 12 ~ 13 mpa kaomi e mālama ana i ka 30 min: ma hope o ka wai - decompression, ʻokiʻoki, sintering, ʻoluʻolu ka hoʻohana ʻana i nā hiʻohiʻona nani a maʻemaʻe.Ua kapa ʻia ʻo Push i ka hoʻoheheʻe ʻana i ka hoʻoheheʻe ʻana, 20 ~ 30 mesh sieve dispersion resin a me ka wai kūlohelohe (e like me toluene, petroleum ether, ka ʻaila solvent) hui ʻia 1: 5 paʻi hui, preloading i loko o ka pā mānoanoa cylinder billet, pahu i loko o ka compressor cylinder , hoʻomehana, me ka plunger pana molding, ma hope o ka maloʻo i loko o ka 360 ~ 380 ° C wela sintering, ma hope o hooluolu huahana i ikaika pana paipu, kookoo, etc.Hoʻohui ʻia ka resin pre-sintered ma hope o ka ʻoki ʻana a kānana i ka cylinder material.Ma o ka hoʻololi ʻana a i ʻole ka pana ʻana o ka plunger, lawe ʻia ka mea maka i ka extruder i ka manawa like o ka compaction.
Ua aʻo ʻo Wang ping i ke kaʻina hana o ka PTFE foam material.Hoʻohana ʻia ka polytetrafluoroethylene i hoʻopaʻa ʻia ma ke ʻano he mea maka, a koho ʻia nā hydrocarbons aromatic cyclic condensed ma ke ʻano he pore-forming agent.Ma hope o ka hui ʻana, hana ʻia nā huahana preforming a sintered.I ka wā mua o ka sintering, hoʻohana ʻia ke kaʻina hana hoʻomaloʻo e pakele ai ka pore-forming agent, a laila komo ke kahua resintering.Hiki ke hoʻomākaukau ʻia nā mea hoʻohūhū me nā dielectric mau ʻokoʻa i nā ʻāpana like ʻole e hoʻokō i nā koi like ʻole.
ʻO Chen xu et al.ho'āʻo hoʻopaʻa ʻia a me ka hoʻāʻo sintering ma PTFE, kūkākūkā i ka pilina ma waena o ka mānoanoa, ka ikaika hoʻopiʻi a me ka modulus kaomi, a me ka nānā ʻana i ka ikaika hoʻopiʻi o nā specimens ma lalo o nā kaʻina sintering like ʻole, a loaʻa i ke kaʻina hoʻoheheʻe kūpono a me ke kaʻina sintering.Ua hōʻike nā hopena i ka emi ʻana o ka ikaika hoʻoemi o ka PTFE me ka piʻi ʻana o ke kaomi kaomi, a ua hoʻonui ʻia ka modulus compression me ka piʻi ʻana o ke kaomi kaomi.ʻO 27.5mpa ke kaomi hoʻoheheʻe ʻana, ʻo 380 C ka mahana sintering, a ʻo ka manawa insulation he 4h.
I mea e lanakila ai i nā hemahema o ka ptfe maʻemaʻe, e like me ke kū'ē abrasion maikaʻi ʻole a me ka nui o ka hoʻonui ʻana i ka wela, ua aʻo ʻo Raytheon i nā ʻāpana keleawe i piha i ka ptfe, a hoʻonui i ka laulā noi o ptfe.ʻO ka hoʻoheheʻe ʻana mehana maʻamau o ka ptfe ua hōʻike ʻia e ka lōʻihi o ka pōʻaiapuni, maikaʻi ʻole ka hana, haʻahaʻa haʻahaʻa pololei a me ka maʻalahi, ʻoiai ʻo ka hoʻoheheʻe ʻana mehana i kēia haʻawina he liʻiliʻi nā kaʻina hana, pōkole pōkole a hoʻomaikaʻi nui ʻia nā waiwai mechanical.
Ka manawa hoʻouna: Mar-14-2017