Kubva pakuona kwezvinhu zvitatu zvinotarisa maitiro ezvigadzirwa zvePTFE - molecular weight, crystallinity uye voidage, iyo voidage inonyanya kukanganiswa ne preforming pressure, uye molecular weight uye crystallinity zvose zvinoshanduka nemamiriro akasiyana-siyana ekupisa.Naizvozvo,sintering processMamiriro anoita basa rakasimba mune ekupedzisira zvivakwa zvezvigadzirwa zvakaita se density, kuomarara, permeability uye michina zvinhu.
Kubva pakuona kwezvinhu zvitatu zvinotarisa maitiro ezvigadzirwa zvePTFE - molecular weight, crystallinity uye voidage, iyo voidage inonyanya kukanganiswa ne preforming pressure, uye molecular weight uye crystallinity zvose zvinoshanduka nemamiriro akasiyana-siyana ekupisa.Naizvozvo, sintering process mamiriro anoita basa rakasimba mune ekupedzisira zvivakwa zvezvigadzirwa zvakaita se density, kuomarara, permeability uye michina zvinhu.
Wang ping akawana kutiSintering process yePTFEyakakanganiswa nekukwira nekudonha nekukurumidza, sintering tembiricha uye nguva yekudonha.Iyo yakakura chigadzirwa, inononoka kumhanya kwekusimuka uye kutonhora, iyo yakareba nguva yekupisa.Iyo sintering tembiricha yekumisikidza resin yakakwirira kupfuura iyo yekuparadzira resin.Iyo sintering tembiricha yezvakachena zvinhu zvigadzirwa yakakwirira kupfuura iyo yezvakazadzwa zvigadzirwa.Kazhinji, mwero wekudziya unokurumidza kupfuura mwero wekutonhora.Muchoto chimwechete chekupisa, zvinhu zvakachena uye zvigadzirwa zvekuzadza hazvigone kusanganiswa;Zvigadzirwa zvine akasiyana sintering mamiriro hazvigone kusanganiswa.Zvigadzirwa zvezvinhu zvakasiyana-siyana hazvigoni kusanganiswa.Kutora kugadzirwa kwe3-layer yakaumbwa denderedzwa ndiro ine dhayamita 1 m, ukobvu hwe20 mm, yakapetwa kaviri seyakachena ptfe uye yepakati layer seyakazadzwa ptfe semuenzaniso, simba rekumanikidza, kukotama simba, kuomarara uye zvimwe zvinhu zvemuchina. denderedzwa laminated plate inogadzirwa neiyi tekinoroji yakagadziridzwa zvakanyanya.
Liu xianlan akadzidza maitiro ekugadzira maitiro, nzira yekugadzira uye mold dhizaini maitiro ePTFE, akaongorora kukanganisa uye zvikonzero zvePTFE zvigadzirwa zvinogadzirwa nekutonhora kudzvanya uye sintering, uye akaisa mberi nzira dzekurapa.PTFE inogona kuumbwa nemhando dzakasiyana dze preforming process, senge molding, extrusion, hydraulic molding, push molding uye secondary processing, uyezve sintered kune yekupedzisira product.PTFE molding inonyanya kugadzirwa neresin yakamiswa.Kana ukobvu hwepepa huri pasi pe1.5mm, disperse resin inoshandiswa.Maitiro ayo etekinoroji: resin - sieve (kumisa resin mushure mekurova, kusunungura, uye 20 mesh mesh sieve) - press (PTFE poda inotakura mold pasi pekumanikidzwa kubva 20 kusvika 35 MPa, mushure mekudhinda compaction kuumba) - sintering (mu 370 ~ 380 "C tembiricha sintering mu sintering vira) - molded zvigadzirwa (pasi pemahara mamiriro mukati me mold kana mushure mekutonhodzwa kupedzisa dhizaini sezvinodiwa nebhodhi, tsvimbo, machubhu, gaskets uye kurongedza zvigadzirwa, nezvimwewo). Hydraulic nzira inonziwo iyo equilibrium nzira kana kuumbwa kwerabha mukuita kwayo kushanda ndeiyi: isa bhegi rerabha mukufa - rakabatana nepombi yemvura, kuzadza mvura kuzvimba bhegi rerabha mucylindrical - resin yakaenzana inobatana pakati pebhegi uye yekunze mold yekuvhara - ramba uchiwedzera zvishoma nezvishoma kudzvinyirirwa kwemvura, mvura inozadza kusvika ku12 ~ 13 mpa pressure kuchengetedza 30 min: mushure memvura - decompression, kubvarura, sintering, kutonhora ndiko kushandiswa kwekujeka uye kwakachena.Push inonziwo paste extrusion molding, 20 ~ 30 mesh sieve dispersion resin uye organic liquid (senge toluene, petroleum ether, the solvent oil) musanganiswa 1:5 paste musanganiswa, preloading mugobvu madziro cylinder billet, sundira mucompressor cylinder. , kudziyisa, ine plunger push molding, mushure mekuoma mu 360 ~ 380 ° C tembiricha sintering, mushure mekutonhora zvigadzirwa zvine simba rekusundira chubhu, tsvimbo, etc.Extrusion molding inogona kukamurwa kuita mhando mbiri: screw extrusion uye plunger extrusion.Iyo pre-sintered resin mushure mekupwanya uye kupepetwa inowedzerwa kune silinda yezvinhu.Kuburikidza ne screw kutenderera kana kudzoreredza kusunda kwe plunger, iyo mbishi inotakurwa ichiendeswa kune extruder panguva imwechete ye compaction.
Wang ping akadzidza maitiro ekugadzira PTFE furo zvinhu.Yakamiswa polytetrafluoroethylene inoshandiswa seyakabikwa, uye yakapfupikiswa cyclic inonhuhwirira hydrocarbons inosarudzwa se pore-forming agent.Mushure mekusanganiswa, preforming zvigadzirwa zvinofanorongedzerwa uye sintered.Padanho rekutanga rekunyungudika, nzira yekuomesa inotorwa kuita kuti pore-forming agent apukunyuke, uyezve resintering nhanho inopindwa.Foam zvinhu zvine akasiyana dielectric constants zvinogona kugadzirirwa muzvikamu zvakasiyana kuti zvisangane nezvinodiwa zvakasiyana.
Chen xu et al.yakaita compression test uye sintering test paPTFE, yakakurukura hukama huri pakati pehuwandu, simba rekumanikidza uye compression modulus, uye yakaongorora simba rekumanikidza rezvienzaniso pasi pemaitiro akasiyana-siyana ekuputira, uye akawana zvakanyanya zvakakodzera kuumbwa kwekumanikidza uye sintering process.Zvigumisiro zvakaratidza kuti simba rekumanikidza rePTFE rakadzikira nekuwedzera kwekumanikidza, uye iyo compression modulus yakawedzera nekuwedzera kwekumanikidza.Iyo yekuumba pressure yaive 27.5mpa, sintering tembiricha yaive 380 C, uye nguva yekudzivirira yaive 4h.
Kuti akunde kushata kwe pure ptfe, sekunge kusakara kweabrasion kuramba uye hombe yekuwedzera kwemafuta ekuwedzera, Raytheon akadzidza zvidimbu zvakazadzwa nebhuronzi muptfe, uye akawedzera chiyero chekushandisa cheptfe.Iyo yemazuva ese inodziya yekutsikirira molding yeptfe inoratidzwa nekutenderera kwenguva refu, kusaita zvakanaka, kushomeka kwechimiro uye kutsvedzerera, nepo inodziya yekuomesa muchidzidzo ichi ine mashoma ekushanda maitiro, kupfupika uye zvakanyanya kunatsiridza ma mechanical properties.
Nguva yekutumira: Mar-14-2017