Shin ruwa zai iya shiga ta hanyar silicone?

 

Ruwan Ruwa da Tururin Ruwa: “Zubewa” daban-daban guda biyu

1) Zubar da ruwa mai ruwa

Silikon da aka yi amfani da shi yadda ya kamata yawanci yakan toshe ruwan ruwa yadda ya kamata. A mafi yawan matsalolin da ake fuskanta a zahiri, ruwa yana shiga saboda:

• Rufin beads mara cikakke ko siraran spots
• Rashin shiri mai kyau a saman (mai, ƙura, abubuwan da ke fitar da iska)
• Motsin da ke karya layin haɗin gwiwa
• Kumfa, ko kuma tsagewar iska daga wurin da ba a iya gyarawa yadda ya kamata ba
• Ba daidai ba ne a fannin silicone don substrate (ƙarancin mannewa)

Dogon silicone mai ci gaba da ɗaurewa sosai zai iya jure wa feshewa, ruwan sama, har ma da nutsewa na ɗan gajeren lokaci dangane da ƙira, kauri, da yanayin haɗin gwiwa.

2) Tururin ruwa yana kwarara

Ko da silicone bai lalace ba, yawancin silicone elastomers suna ba da damar yaɗuwar tururin ruwa a hankali. Wannan ba "zubar ruwa" ba ne kamar rami - kamar danshi yana ƙaura a hankali ta cikin membrane.

Don kariyar lantarki, wannan bambanci yana da mahimmanci: PCB ɗinku na iya ganin fallasa danshi tsawon watanni/shekaru idan murfin silicone yana iya ratsawa ta tururi, koda kuwa yana toshe ruwan ruwa.

Me yasa ake amfani da Silicone a matsayin Encapsulant

A manne na siliconeAn zaɓi ba kawai don hana ruwa shiga ba, har ma don cikakken aminci:

• Zafin aiki mai faɗi:yawancin silicone suna aiki kusan daga-50°C zuwa +200°C, tare da maki na musamman mafi girma.
• Sassauci da rage damuwa:ƙarancin modulus yana taimakawa wajen kare haɗin solder da abubuwan da aka gyara yayin zagayowar zafi.
• juriya ga UV da yanayi:silicone yana da kyau a waje idan aka kwatanta da yawancin polymers na halitta.
• Rufin lantarki:Kyakkyawan aikin dielectric yana tallafawa ƙirar lantarki mai ƙarfi da ƙarfi.

A wata ma'anar, silicone sau da yawa yana inganta dorewa na dogon lokaci koda kuwa "cikakkiyar shingen danshi" ba shine babban burin ba.

Me ke tantance ko ruwa yana shiga ta hanyar silicone?

1) Ingancin magani da kauri

Siririn rufi yana da sauƙin ratsa tururin ruwa, kuma siririn beads yana da sauƙin lalacewa. Don rufewa, kauri mai daidaito yana da mahimmanci. Don tukunya/rufewa, ƙara kauri na iya rage watsa danshi da inganta kariyar injiniya.

2) Mannewa ga substrate

Silicone zai iya mannewa sosai, amma ba ta atomatik ba. Karfe, robobi, da saman da aka shafa na iya buƙatar:

• Gogewar sinadarai / rage mai
• Ragewar gashi (inda ya dace)
• An tsara Primer don haɗa silicone

A cikin samarwa, gazawar mannewa shine babban dalilin "zubar da ruwa," koda kuwa silicone ɗin kanta yayi kyau.

3) Zaɓin kayan aiki: RTV da ƙari-magani, cikewa da rashin cikawa

Ba duk silicones suna aiki iri ɗaya ba. Tsarin yana shafar:

• Ragewa idan aka warke (ƙarancin raguwa yana rage ƙananan gibi)
• Modulus (lankwasawa da tauri)
• Juriyar Sinadarai
• Yawan yaɗuwar danshi

Wasu silikon da aka cika da kuma wasu sinadarai masu kariya na musamman suna rage yawan iska idan aka kwatanta da silikon da ake amfani da su wajen numfashi.

4) Tsarin haɗin gwiwa da motsi

Idan haɗin ya faɗaɗa/ya yi ƙunci, hatimin dole ne ya dace da motsi ba tare da ɓawon ba. Lalacewar silicone babban fa'ida ne a nan, amma sai idan ƙirar haɗin ta samar da isasshen yanki na haɗin gwiwa kuma ta guji kusurwoyi masu kaifi waɗanda ke mai da hankali kan damuwa.

Jagora Mai Amfani: Lokacin da Silicone Ya Isa—Da Lokacin da Bai Isa ba

Silicone yawanci kyakkyawan zaɓi ne idan kuna buƙatar:

• Rufe yanayi na waje (ruwan sama, fesawa)
• Juriyar zagayowar girgiza/zafin zafi
• Rufin lantarki tare da matashin injina

Yi la'akari da wasu hanyoyi ko ƙarin shinge idan kuna buƙatar:

• Rigakafin shigar da danshi na dogon lokaci a cikin na'urorin lantarki masu laushi
• Hatimin "hermetic" na gaske (silicon ba hermetic ba ne)
• Ci gaba da nutsewa tare da bambance-bambancen matsin lamba

A irin waɗannan yanayi, injiniyoyi kan haɗa dabarun: murfin silicone don rage damuwa + gasket ɗin gida + murfin conformal + manne mai bushewa ko membrane na iska, ya danganta da yanayin.

Layin Ƙasa

Ruwa yawanci baya zubewata hanyarsilicone da aka warke a matsayin ruwa—yawancin matsalolin suna fitowa ne daga rashin mannewa, gibba, ko lahani. Amma tururin ruwa na iya ratsawa ta cikin silicone, shi ya sa "mai hana ruwa" da "mai hana danshi" ba koyaushe suke iri ɗaya ba a cikin kariyar lantarki. Idan ka gaya mini akwatin amfaninka (rufewa a waje, tukunyar PCB, zurfin nutsewa, kewayon zafin jiki), zan iya ba da shawarar nau'in murfin silicone da ya dace, kauri mai manufa, da gwaje-gwajen tabbatarwa (ƙimar IP, gwajin jiƙawa, zagayowar zafi) don dacewa da burin aminci.