Yiziphi izinhlaka ze ibhodi le-epoxy resin

Ukuze kuzuzwe umphumela wokusetshenziswa ongcono kakhulu webhodi le-epoxy resin, amanye amapharamitha ayadingeka. Okulandelayo, abakhiqizi abangochwepheshe bazosinika isingeniso esiningiliziwe. Woza ufunde kabanzi ngayo.

Ukuhlukaniswa kwepharamitha yeshidi le-epoxy resin: ipharamitha ehlala njalo ye-dielectric, ipharamitha yokulahleka kwe-dielectric, ipharamitha yenani le-TG

Ishidi le-epoxy resin ishidi le-PCB elinezinhlangothi ezimbili elenziwe nge-epoxy resin + indwangu yengilazi. Ishidi le-FR4 eline-copper-clad elivame ukusetshenziswa line-dielectric constant ehlobene engu-4.2-4.7. Le dielectric constant izoshintsha nezinga lokushisa. Ezingeni lokushisa lika-0-70 degrees, uhla lokushintsha okuphezulu lungafinyelela ku-20%. Ushintsho ku-dielectric constant luzobangela ushintsho lwe-10% ekubambezelekeni komugqa, futhi uma izinga lokushisa liphezulu, ukubambezeleka okukhulu. I-dielectric constant izophinde ishintshe nefrikhwensi yesignali. Ukuphakama kwe-frequency, kuncane kwe-dielectric constant. Ngokuvamile, inani lakudala le-dielectric constant yi-4.4. I-dielectric ishintsha njalo ngobuningi njengoba kuboniswe ku-Fig.

I-dielectric constant (Dk, ε, Er) inquma isivinini amasignali kagesi ahamba ngaso phakathi nendawo. Isivinini okuhamba ngaso amasiginali kagesi siphambene ngokuphambene nempande yesikwele ye-dielectric constant. Ukwehla kwe-dielectric constant, kuyashesha ukudluliswa kwesignali. Asenze isifaniso esibonwayo. Kufana nokuthi ugijima ogwini lolwandle, futhi ukujula kwamanzi kucwilisa amaqakala akho. I-viscosity yamanzi yi-dielectric constant. Lapho amanzi e-viscous kakhulu, akhuphuka i-dielectric constant, futhi ugijima kancane.

I-dielectric constant ayilula kakhulu ukuyikala noma ukuyichaza. Akuhlobene kuphela nezici ze-medium ngokwayo, kodwa futhi nendlela yokuhlola, imvamisa yokuhlola, kanye nesimo sempahla ngaphambi nangesikhathi sokuhlolwa. I-dielectric constant nayo izoshintsha ngokushintsha kwezinga lokushisa. Ezinye izinto ezikhethekile zicabangela izinga lokushisa ekuthuthukisweni. Umswakama nakho kuyisici esibalulekile esithinta i-dielectric constant, ngoba i-dielectric constant of water ingama-70, futhi kunomswakama omncane kakhulu. , izodala izinguquko ezibalulekile.

Ukulahlekelwa kwe-Dielectric kweshidi le-epoxy resin: ukulahlekelwa kwamandla ngaphakathi kwempahla yokuvikela ngenxa yomphumela we-hysteresis we-dielectric conductance kanye ne-dielectric polarization ngaphansi komphumela wensimu kagesi. Futhi kubizwa ngokuthi ukulahlekelwa kwe-dielectric, okubizwa ngokuthi ukulahlekelwa kwe-dielectric. Ngaphansi komphumela wenkambu kagesi eshintshanayo, i-engeli ehambisanayo δ ye-engeli efakiwe (i-engeli yesici samandla Φ) phakathi kwe-phasor yamanje kanye ne-voltage phasor egeleza ku-dielectric ibizwa ngokuthi i-dielectric loss angle. Ukulahleka kwe-dielectric kweshidi le-epoxy resin ngokuvamile kungu-0.02, futhi ukulahlekelwa kwe-dielectric kuzokhula ngokunyuka kwemvamisa.

Inani le-TG leshidi le-epoxy resin: elaziwa nangokuthi izinga lokushisa lokushintsha kwengilazi, ngokuvamile li-130 ℃, 140 ℃, 150 ℃, 170 ℃.