(Kovar zuwa Alumina PartSamar da taWintrustek)

I. Bayanin Kovar

Kovar shine ƙarfe-nickel-cobalt na tushen faɗaɗa gami wanda babban fasalinsa shine ƙimar faɗaɗawar zafinsa yayi daidai da na wasu tabarau masu ƙarfi da tukwane (kamar alumina) a cikin wani takamaiman yanayin zafi. Wannan fasalin ya sa ya zama muhimmin abin rufewa a cikin marufi na lantarki, sararin samaniya, lasers, da sauran masana'antu. Yawanci ana amfani da shi don ƙirƙira abubuwan haɗin ƙarfe don hatimi na hermetic da gilashi ko yumbu.

Sunan "4J" don madaidaicin gami a ƙarƙashin ma'auni na kasar Sin (GB) yana wakiltar gami da ke da halayen haɓaka "kusa da" (J) wata ƙima.

II. Cikakkun Nazari na Makin Kovar Uku

Commonality: Duk ukun sun dogara ne akan Fe-Ni-Co kuma suna da kaddarorin haɓaka kama da gilashin wuya da tukwane. Wuraren faɗaɗa yanayin zafi, yanayin yanayin Curie, da halayen injina sun bambanta sosai sakamakon ƴan canje-canjen abun da ke ciki.

1. 4J29 (the most classic and widely used Kovar)

Nau'in Halitta:Fe-29Ni-17Co, tare da ƙananan ƙari na abubuwa masu lalata abubuwa kamar manganese da silicon.

Halayen Faɗawa: Matsakaicin adadin faɗaɗa layin layi wanda ya dace sosai da gilashin ƙungiyar DM-308 molybdenum da 92-96% alumina yumbura a cikin kewayon 20-450°C.

Mabuɗin Maɓalli:

• Curie zafin jiki: Kimanin 430°C (rasa abubuwan da ke sama da wannan zafin jiki).

• Abubuwan da suka dace: Manyan tukwane na alumina, gilashin ƙungiyar molybdenum.

• Jiyya na saman: Yawanci yana buƙatar nickel ko plating na zinari don haɓaka ƙarfin ƙarfi da juriya na lalata.

• Aikace-aikace na farko: Bututun Microwave, Laser, haɗe-haɗen gidaje, babban abin dogaro, masu haɗin sararin samaniya.

2. 4J33 da 4J34 (Ingantacciyar Kovar)

Waɗannan gami bambance-bambancen bambance-bambance ne da aka haɓaka don magance gazawar 4J29 (kamar ƙaramar haɓakar haɓakar ƙananan zafin jiki), mai nuna yanayin zafi mafi girma na Curie.

Bambance-bambancen Rubutu:

• 4J33: Fe-33Ni-14Co (reduced cobalt, increased nickel).

• 4J34: Fe-31Ni-15Co (composition intermediate between the two).

Halayen Faɗawa:A dakin da zafin jiki zuwa kusan 300 ° C, ƙimar haɓakawa ta ɗan ƙasa da 4J29, yana ba da mafi kyawun dacewa tare da wasu tabarau na musamman ko yumbu.

Mabuɗin Fa'ida-Maɗaukakin Zazzabi:

• 4J29: ~430°C

• 4J33: ~500°C

• 4J34: ~480°C

Muhimmanci:Mafi girman zafin jiki na Curie yana tabbatar da cewa kayan sun kasance marasa maganadisu a yanayin yanayin aiki mai tsayi, yana hana tsangwama na maganadisu tare da mitoci masu tsayi, madaidaicin kayan aiki.

Zaɓin aikace-aikacen: Ya dace da yanayin zafi mai zafi ko aikace-aikace masu mahimmancin maganadisu, ko zaɓi dangane da gwaje-gwajen da suka dace da faɗaɗa tare da takamaiman kayan rufewa.

III. Babban Fa'idodin Brazing Kovar tare da Alumina Ceramics

Gas-m hermetic sealing na Kovar da alumina yumbu ta hanyar brazing fasaha ce mai mahimmanci a cikin marufi na lantarki na zamani, tare da fa'idodi na farko masu zuwa:

1. Na Musamman Daidaita Faɗawar Zafi (Fundamental Advantage)

Lokacin sanyaya daga brazing zuwa zafin ɗaki, ƙimar ƙanƙancewa iri ɗaya na kayan biyu suna rage yawan damuwa na zafi a haɗin gwiwa. Wannan ya sami nasarar kawar da fasawar yumbura da karyewar kabu, yana haifar da matsakaicin dogaro.

2.  Samun Babban Tsantsin Gas

Adadin ruwan ɗigon helium a cikin balagagge tsarin sau da yawa yakan faɗi ƙasa da 1 × 10⁻ Pa·m³/s don abubuwan da aka rufe, yadda ya kamata ke ware danshi da iskar oxygen. Wannan ya dace da matsananciyar buƙatun dogaro ga sararin samaniya, soja, da sauran aikace-aikacen da ake buƙata.

3. Mafi Ƙarfin Injini da Tsari Tsari

Kofar provides mai ƙarfi goyon bayan inji da taurin, yayin da alumina yumbu ba da kyakkyawan rufi da taurin. Brazing waɗannan kayan yana haifar da ƙaƙƙarfan tsari mai haɗaɗɗiya tare da fasali na kariya da na aiki duka.

4. Balagagge Tsari da Babban Dogara

An gina sarkar tsari mai daidaituwa, wanda ya haɗa da ƙarfe na yumbu (fasahar molybdenum-manganese), plating nickel, haɗuwa tare da abubuwan Kovar, da vacuum/kariya brazing. Tsarin yana da iko sosai, ya dace da samarwa da yawa, kuma yana samar da babban yawan amfanin ƙasa tare da daidaiton inganci.

IV. Takaitaccen Kwatancen da Shawarwari na Zaɓi

Ⅴ. Kammalawa

A cikin dangin Kovar, 4J29 shine ma'auni da abin da aka ba da shawarar don brazing manyan yumbu alumina, samar da ma'auni mai kyau na aiki, farashi, da dogaro. 4J33/34 haɓaka aiki ne don takamaiman aikace-aikace waɗanda ke buƙatar yanayin zafi mai ƙarfi ko ƙaƙƙarfan halaye marasa maganadisu.Ƙarfafawar Kovar tare da yumbu alumina, wanda aka goyan bayan haɓakar haɓakar haɓakar su ta thermal, ya zama ma'aunin masana'antu don marufi na hermetic na babban abin dogaro na lantarki da kayan aikin optoelectronic.