Sei Kusarudza PTFE yeZvisimbiso?

PTFE zvisimbisouye zvigadziriso zvekuisa chisimbiso zvinoshandiswa mumisika yechinyakare yekuisa chisimbiso sepneumatics uye hydraulics pamwe neaerospace, simba, oiri uye gasi, iyo sainzi yehupenyu chikamu uye mumunda wezvezve simba.

Hunhu hwePTFESeals dzakagadzirwa kubva kuPTFE (Polytetrafluoroethylene) dzinoshandiswa uko zvimwe zvinhu zvakawanda zvekuvharisa (se elastomers, PUR, machira emidziyo, nezvimwewo) zvinotadza kuzadzisa tembiricha inodiwa, kuramba kwemakemikari kana friction uye kupfeka zvinodiwa.PTFE yakawanikwa netsaona mu 1938 naDr. Roy J. Plunkett werabhoritari yeDu Pont's Jackson muNew Jersey, USA.Paaiongorora magasi ane chekuita nemafiriji ane fluorinated, akawana kuti sampuli imwe yakasiiwa husiku muhumburumbira yekuchengetera yakange yavepolymeri yakangoerekana yaita muchena, waxy solid.Ichi chakasimba chakaratidza kuva nechimiro chakasiyana chine zvinhu zvinoshamisa.Iyo molecularstructure yePTFE yakavakirwa pamutsara wetani yekabhoni maatomu ayo akakomberedzwa zvakazara nemaatomu efluorine.Iwo kabhoni-fluorine zvisungo ari pakati peakasimba kwazvo anoitika mu organic makomisheni.

• Thermal kugadzikana pane yakakura tembiricha renji: PTFE's high melting point (342 °C) uye morphological maitiro anobvumira zvikamu zvakagadzirwa kubva muresin kuti zvirambe zvichishandiswa pakupisa kwesevhisi kusvika ku260 °C.Pamusoro peiyi tembiricha zvinhu zvemuviri zvinodzikira, zvichikonzera kupisa-kukwegura uye kuparara kwezvinhu.PTFE inoshandiswa pane tembiricha ye cryogenic kuvhara midhiya yakaoma senge liquid nitrogen (-196 °C), liquid hydrogen (-253 °C) uye mvura helium (-269 °C).PTFE ine yakasarudzika kugona kuramba kusvibiswa kwezvinhu, kupisa-kuchembera uye kuchinjwa kwezvinhu zvemuviri panguva yekutenderera bhasikoro.
• Low friction / yakaoma kumhanya kugona: PTFE ine yakaderera friction coefficient pane chero inozivikanwa yakasimba.Iyo ine yega-kuzora masimba, ichipa inoenderera yakaoma yekumhanya kugona mune ine simba yekuisa chisimbiso maapplication.
• Kunyanya makemikari kuramba: Iyo intra polymer chain bond simba rePTFE rinodzivirira kuita nemakemikari mazhinji, nekudaro zvichiita kuti makemikari apinde mukati metembiricha yakakwira uye madhindindi ane angangoita ese emaindasitiri makemikari uye zvinonyungudutsa.Mamidhiya mashoma chete anozivikanwa kuita nePTFE: alkali simbi, fluorine uye mashoma fluoro-makemikari akadai sechlorine tri-fluoride uye oksijeni difluoride.PTFE inokodzera kusangana nechikafu uye inogutsa FDA zvinodiwa.

Zviripachena kuti kubva pakuona kwekuvharisa, aya akasiyana hunhu anopa PTFE hunyanzvi hunodarika hwezvakajairwa elastomeric sealing materials.Zvimwe zvakatanhamara ndezvi:

• Yakaderedzwa stick-slip
• Unlimited sherufu hupenyu: PTFE haina kuchembera nekufamba kwenguva uye haina kukanganiswa ne ultraviolet mwenje.
• Hapana kuputika decompression: PTFE haigadziriswi nekuzara kwepamusoro-kumanikidza gasi iyo inogona kuwedzera nechisimba uye inokonzera kuputika kwezvinhu apo kudzvinyirirwa kunobviswa kamwe kamwe.
• Hapana kuzvimba nekuda kwekutorwa kwemwando.
• Yakachengeteka kushandiswa mumamiriro ekutsvaira.
• Excellent magetsi zvinhu: Yakakwira dielectric simba, yakaderera dielectric inongogara uye yakanyanya kupikisa magetsi.