Nrog rau txoj kev loj hlob ntawm niaj hnub high-tech, electromagnetic cuam tshuam (EMI) thiab electromagnetic compatibility (EMC) teeb meem tshwm sim los ntawm electromagnetic nthwv dej tau dhau los ua hnyav dua.Lawv tsis tsuas yog ua rau muaj kev cuam tshuam thiab kev puas tsuaj rau cov cuab yeej hluav taws xob thiab cov cuab yeej siv, cuam tshuam rau lawv cov kev ua haujlwm ib txwm muaj, thiab txwv tsis pub peb lub teb chaws thoob ntiaj teb kev sib tw hauv cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, thiab tseem ua rau ib puag ncig thiab ua rau muaj kev phom sij rau tib neeg kev noj qab haus huv;Tsis tas li ntawd, qhov xau ntawm cov hluav taws xob tsis zoo yuav ua rau muaj kev phom sij rau lub teb chaws cov ntaub ntawv kev ruaj ntseg thiab kev ruaj ntseg ntawm tub rog tub ceev xwm secrets.Tshwj xeeb, cov riam phom electromagnetic pulse, uas yog cov tswv yim tshiab riam phom, tau ua kom muaj kev cuam tshuam loj heev, uas tuaj yeem tawm tsam cov khoom siv hluav taws xob, lub zog hluav taws xob, thiab lwm yam, ua rau tsis ua haujlwm ib ntus lossis kev puas tsuaj mus tas li rau cov ntaub ntawv xov xwm, thiab lwm yam.

Yog li, kev tshawb nrhiav cov khoom siv hluav taws xob tiv thaiv hluav taws xob tiv thaiv hluav taws xob tiv thaiv kev cuam tshuam ntawm electromagnetic cuam tshuam thiab cov teeb meem electromagnetic compatibility tshwm sim los ntawm electromagnetic nthwv dej yuav txhim kho kev nyab xeeb thiab kev ntseeg siab ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, txhim khu kev sib tw thoob ntiaj teb, tiv thaiv hluav taws xob pulse riam phom, thiab xyuas kom muaj kev nyab xeeb ntawm cov ntaub ntawv kev sib txuas lus thiab kev sib txuas lus. , kis kab mob, riam phom platforms, thiab lwm yam yog qhov tseem ceeb heev.

1. Txoj cai ntawm electromagnetic shielding (EMI)

Electromagnetic shielding yog siv cov ntaub thaiv npog los thaiv lossis txo qhov kev nthuav tawm ntawm lub zog hluav taws xob ntawm thaj chaw tiv thaiv thiab lub ntiaj teb sab nraud.Lub hauv paus ntsiab lus ntawm electromagnetic shielding yog siv lub shielding lub cev los xav txog, nqus thiab coj cov electromagnetic zog ntws, uas yog ze ze rau cov nqi, tam sim no thiab polarization induced nyob rau saum npoo ntawm lub shielding qauv thiab nyob rau hauv lub shielding lub cev.Kev tiv thaiv hluav taws xob tau muab faib ua hluav taws xob tiv thaiv hluav taws xob (electrostatic shielding thiab alternating electric field shielding), magnetic field shielding (low-frequency magnetic field and high-frequency magnetic field shielding) thiab electromagnetic field shielding (electromagnetic yoj shielding) raws li nws txoj cai.Feem ntau hais lus, electromagnetic shielding yog hais txog tom kawg, uas yog, tiv thaiv hluav taws xob thiab sib nqus teb tib lub sijhawm.

2. Electromagnetic shielding khoom

Tam sim no, composite electromagnetic shielding txheej yog dav siv.Lawv cov ntsiab lus tseem ceeb yog zaj duab xis-forming resin, conductive muab tub lim, diluent, coupling agent thiab lwm yam additives.Conductive muab tub lim yog ib qho tseem ceeb ntawm nws.Cov feem ntau yog nyiaj (Ag) hmoov thiab tooj liab (Cu) hmoov., npib tsib xee (Ni) hmoov, nyiaj-coated tooj liab hmoov, carbon nanotubes, graphene, nano ATO, thiab lwm yam.

2.1Cov pa roj carbon nanotubes(CNTs)

Cov pa roj carbon nanotubes muaj qhov sib piv zoo, hluav taws xob zoo heev, cov khoom sib nqus, thiab tau pom tias muaj kev ua tau zoo hauv kev coj ua, nqus thiab tiv thaiv.Yog li ntawd, kev tshawb fawb thiab kev loj hlob ntawm carbon nanotubes raws li conductive fillers rau electromagnetic shielding coatings tau ntau thiab ntau nrov.Qhov no tso siab rau ntawm purity, productivity, thiab nqi ntawm carbon nanotubes.Cov pa roj carbon nanotubes tsim los ntawm Hongwu Nano, suav nrog ib lub phab ntsa thiab ntau phab ntsa, muaj qhov purity txog li 99%.Txawm hais tias cov pa roj carbon nanotubes tau tawg mus rau hauv cov matrix resin thiab seb lawv puas muaj kev sib raug zoo nrog cov matrix resin los ua qhov cuam tshuam ncaj qha rau kev tiv thaiv kev ua haujlwm.Hongwu Nano kuj muab cov pa roj carbon nanotube dispersed dispersion tov.

2.2 Flake silver hmoov nrog tsawg pom tseeb ntom

Cov txheej txheem luam tawm ntxov tshaj plaws yog daim ntawv pov thawj uas tau muab los ntawm Tebchaws Meskas hauv xyoo 1948 uas ua rau cov nyiaj thiab epoxy resin rau hauv cov nplaum nplaum.Electromagnetic shielding xim npaj nrog lub pob milled flake nyiaj hmoov uas tsim los ntawm Hongwu Nano muaj cov yam ntxwv ntawm kev ua haujlwm qis, zoo conductivity, siab tiv thaiv efficiency, muaj zog ib puag ncig kam rau ua, thiab kev tsim kho yooj yim.Lawv tau dav siv hauv kev sib txuas lus, hluav taws xob, kev kho mob, aerospace, nuclear chaw thiab lwm yam.Shielding xim kuj tsim nyog rau txheej txheej ntawm ABS, PC, ABS-PCPS thiab lwm yam yas yas.Cov ntsuas kev ua tau zoo suav nrog kev hnav tsis kam, siab thiab kub tsis kam, av noo thiab kub tsis kam, adhesion, hluav taws xob tiv thaiv, electromagnetic compatibility, thiab lwm yam tuaj yeem ncav cuag tus qauv.

2.3 Copper hmoov thiab npib tsib xee hmoov

Copper hmoov conductive xim muaj tus nqi qis thiab nws yooj yim rau xim, kuj muaj cov nyhuv electromagnetic shielding zoo, thiab yog li nws yog dav siv.Nws yog qhov tshwj xeeb tshaj yog tsim rau kev tiv thaiv hluav taws xob yoj cuam tshuam ntawm cov khoom siv hluav taws xob nrog engineering plastics raws li lub plhaub, vim tias tooj liab hmoov conductive xim tuaj yeem txau lossis txhuam tau yooj yim.Yas nto ntawm ntau yam duab yog metalized los ua ib tug electromagnetic shielding conductive txheej, kom cov yas muaj peev xwm ua tau raws li lub hom phiaj ntawm shielding electromagnetic tsis.Lub morphology thiab tus nqi ntawm cov hmoov tooj liab muaj qhov cuam tshuam zoo rau kev ua haujlwm ntawm txheej txheej.Copper hmoov muaj spherical, dendritic, thiab flake-zoo li duab.Cov duab flake muaj qhov sib cuag loj dua li cov duab kheej kheej thiab qhia tau zoo dua conductivity.Tsis tas li ntawd, cov hmoov tooj liab (nyiaj-coated tooj liab hmoov) yog coated nrog inactive metallic silver hmoov, uas tsis yooj yim rau oxidize, thiab cov ntsiab lus ntawm cov nyiaj feem ntau yog 5-30%.Copper hmoov conductive txheej yog siv los daws cov electromagnetic shielding ntawm ABS, PPO, PS thiab lwm yam engineering plastics thiab ntoo thiab hluav taws xob conductivity, muaj ntau yam kev thov thiab kev txhawb nqa tus nqi.

Tsis tas li ntawd, electromagnetic shielding efficiency ntsuas tau ntawm nano npib tsib xee hmoov thiab electromagnetic shielding coatings tov nrog nano thiab micron nickel hmoov qhia tau hais tias qhov sib ntxiv ntawm nano Ni particle tuaj yeem txo cov electromagnetic shielding efficiency, tab sis tuaj yeem ua rau kom poob siab.Qhov sib nqus poob tangent yog txo, nrog rau kev puas tsuaj rau ib puag ncig, khoom siv thiab tib neeg kev noj qab haus huv los ntawm electromagnetic tsis.

2.4 Nano Tin Antimony Oxide (ATO)

Nano ATO hmoov, raws li ib tug tshwj xeeb muab tub lim, muaj ob qho tib si siab transparency thiab conductivity, thiab ib tug ntau yam ntawm daim ntaub ntawv nyob rau hauv lub tshav pob ntawm cov ntaub ntawv txheej, conductive antistatic coatings, thiab pob tshab thermal rwb thaiv tsev txheej.Ntawm cov ntaub ntawv txheej rau cov khoom siv optoelectronic, nano ATO cov ntaub ntawv muaj kev tiv thaiv zoo li qub, tiv thaiv glare thiab tiv thaiv hluav taws xob, thiab tau siv thawj zaug los ua cov khoom siv hluav taws xob tiv thaiv hluav taws xob.ATO nano txheej cov ntaub ntawv muaj lub teeb pom kev zoo xim, zoo hluav taws xob conductivity, txhua yam muaj zog thiab ruaj khov, thiab lawv daim ntawv thov los tso saib cov khoom siv yog ib qho tseem ceeb ntawm kev lag luam ntawm ATO cov ntaub ntawv tam sim no.Cov khoom siv hluav taws xob (xws li cov lus qhia lossis cov qhov rais ntse) tam sim no yog ib qho tseem ceeb ntawm nano-ATO daim ntawv thov hauv cov zaub.

2.5 Graphene

Raws li hom tshiab ntawm cov khoom siv carbon, graphene muaj feem ntau yuav dhau los ua hom tshiab ntawm cov khoom siv hluav taws xob tiv thaiv hluav taws xob zoo lossis cov khoom siv microwave absorbing dua li carbon nanotubes.Cov laj thawj tseem ceeb suav nrog cov hauv qab no:

①Graphene yog cov yeeb yaj kiab hexagonal tiaj tus uas muaj cov pa roj carbon atom, cov khoom siv ob sab nrog lub thickness ntawm tsuas yog ib qho carbon atom;

②Graphene yog lub thinnest thiab hardest nanomaterial nyob rau hauv lub ntiaj teb no;

③ Lub thermal conductivity yog siab dua li cov pa roj carbon nanotubes thiab pob zeb diamond, ncav cuag li 5 300W / m•K;

④ Graphene yog cov khoom siv nrog qhov tsawg tshaj plaws hauv lub ntiaj teb, tsuas yog 10-6Ω•cm;

⑤ Lub electron txav ntawm graphene ntawm chav tsev kub yog siab dua li cov pa roj carbon nanotubes lossis silicon crystals, tshaj 15 000 cm2 / V•s.Piv nrog rau cov khoom siv ib txwm siv, graphene tuaj yeem tawg los ntawm cov kev txwv qub thiab dhau los ua cov khoom siv hluav taws xob tshiab kom ua tau raws li qhov xav tau ntawm kev nqus.Wave cov ntaub ntawv muaj qhov xav tau ntawm "nyias, lub teeb, dav thiab muaj zog".

Kev txhim kho ntawm electromagnetic shielding thiab absorbing cov ntaub ntawv kev ua tau zoo nyob ntawm cov ntsiab lus ntawm tus neeg sawv cev absorbing, kev ua tau zoo ntawm tus neeg sawv cev absorbing thiab qhov zoo impedance txuam ntawm absorbing substrate.Graphene tsis tsuas yog muaj cov qauv ntawm lub cev tshwj xeeb thiab cov khoom zoo heev thiab cov khoom siv hluav taws xob, tab sis kuj muaj cov khoom siv microwave zoo.Tom qab nws tau ua ke nrog cov hlau nplaum nanoparticles, ib hom tshiab ntawm cov khoom nqus tau tuaj yeem tau txais, uas muaj ob qho tib si sib nqus thiab hluav taws xob poob.Thiab nws muaj daim ntawv thov kev cia siab zoo hauv thaj chaw ntawm electromagnetic shielding thiab microwave nqus.

Rau saum toj no cov ntaub ntawv electromagnetic shielding nano hmoov, ob qho tag nrho yog muaj los ntawm Hongwu Nano nrog ruaj khov thiab zoo zoo.