Yini eyenza isixhumi singashisi?
Ngokuqondile, ukumelana nokushisa kuncike kakhulu kulezi zilinganiso ezintathu ezilandelayo:
1. Izinto zokuvikela izindlu (ipulasitiki)
Lona "uhlaka" lwesixhumi, olunesibopho sokulungisa ama-terminal kanye nokufakwa kokushisa. Ukumelana nokushisa kwaso kuvame ukulinganiswa yi-Relative Temperature Index (RTI), emele izinga lokushisa lapho ukusebenza kwezinto kwehla khona ngo-50% emahoreni ayi-100,000. Ukukhetha izinto ezinenani eliphezulu le-RTI kubalulekile ekumelaneni nokuguga kokushisa kwesikhathi eside.
Izinto ezivamile zepulasitiki ezishisa kakhulu zifaka:
I-LCP (i-Liquid Crystal Polymer): Inikeza ukusebenza okuhle kakhulu, ngokumelana nokushisa okungu-290°C - 320°C, okuvame ukusetshenziswa ezingxenyeni ze-SMT noma ezindaweni zezimoto ezishisa kakhulu.
I-PPS (i-Polyphenylene Sulfide): Ukuqina okuphezulu kanye nokuqina kobukhulu, kanye nokushisa okuguquguqukayo kokushisa okungaba ngu-260°C.
Inayiloni eshisa kakhulu (njenge-PA6T, i-PA46): Ilinganisela ukuqina nokumelana nokushisa, ngokumelana nokushisa okungaba ngu-260°C - 300°C.
I-PBT (i-Polybutylene Terephthalate): Ukumelana nokushisa okuvamile, okunokumelana nokushisa okungaba ngu-230°C, okusetshenziswa kakhulu kumadivayisi kagesi ajwayelekile.
2. Izinto Zesiphetho Sensimbi (Ama-Alloys Ethusi)
Lona "umthambo" wesixhumi, obhekene nokuqhuba ugesi. Emazingeni okushisa aphezulu, izinsimbi ezivamile zivame ukukhululeka ekucindezelekeni, okungaholela ekunciphiseni ukunwebeka kokuxhumana, okubangela ukuphazamiseka kwesignali noma ukumelana okwandisiwe. Ngakho-ke, kubalulekile ukukhetha ama-alloy ethusi anokumelana okunamandla ekuphumuleni ekucindezelekeni.
I-Beryllium Copper: I-elasticity enhle kakhulu, ukumelana nokukhathala okuphezulu kanye nokumelana nokushisa uma kuqhathaniswa nethusi, okwenza kube ukukhetha okuhle kakhulu kokusetshenziswa okuthembekile kakhulu nokushisa okubanzi.
I-Phosphor Bronze: Inzima kunethusi, ikwazi ukugcina ukunwebeka isikhathi eside, ivame ukusetshenziswa ezimweni lapho izinga lokushisa lokusebenza lingaphansi kuka-300°F (cishe u-149°C).
3. Umklamo Wesakhiwo Sokuphathwa Kokushisa Okuphelele
Lolu "uhlelo lokulawula izinga lokushisa" lwesixhumi. Ukushisa kwe-Joule okukhiqizwa ugesi kungumthombo oyinhloko wokwenyuka kwezinga lokushisa langaphakathi, futhi isakhiwo esihle singasusa ukushisa ngempumelelo, sivimbele izinga lokushisa langaphakathi ukuthi lingabi phezulu kakhulu.
Umklamo wesikhala esikhulu: Ukwandisa ibanga elibonakalayo phakathi kwama-terminal kusiza ekushabalaleni kokushisa ngokusebenzisa i-convection yomoya.
Isakhiwo sokushabalalisa ukushisa: Ezinye izixhumi zezimoto ezinamandla aphezulu noma ezintsha zamandla zisebenzisa i-casing yensimbi noma ama-heat sink, zisebenzisa i-conduction kanye ne-convection ukuthwala ukushisa.
Ukumelana nokushisa kwesixhumi kungumphumela womphumela ohlangene wezinto zokwakha kanye nesakhiwo:
Ipulasitiki iyisisekelo: inquma izinga lokushisa eliphezulu lemvelo isixhumi esingalimelana nalo (isibonelo, ukuthi singalibekezelela yini i-soldering yokushisa okuphezulu).
Insimbi iyona eyinhloko: inquma ukuthi isixhumi singagcina yini ukuxhumana okunwebekayo okuthembekile ngaphansi kwezimo zamandla okushisa okuphezulu isikhathi eside.
Isakhiwo siyisihluthulelo: sinquma izinga lokuqongelela kokushisa kwangaphakathi, ekugcineni kuthinte izinga lokushisa langempela lokusebenza.