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(Common Name: Kovar, Nilo K, KV-1, Dilver Po, Vacon 12)
Alloy-4J29 yomwe imadziwikanso kuti Kovar alloy. idapangidwa kuti ikwaniritse kufunikira kwa chisindikizo chodalirika cha galasi kukhala chitsulo, chomwe chimafunika muzipangizo zamagetsi monga mababu a magetsi, machubu a vacuum, machubu a cathode ray, komanso mumakina a vacuum mu chemistry ndi kafukufuku wina wasayansi. Zitsulo zambiri sizingathe kutseka kugalasi chifukwa kuchuluka kwawo kwa kutentha kwa expAN SIon sikofanana ndi galasi, kotero pamene cholumikizira chimazizira pambuyo popangidwa, kupsinjika chifukwa cha kusiyana kwa expAN SIon kwa galasi ndi chitsulo kumapangitsa cholumikiziracho kusweka.
(-Kovar)
Kovar ndi aloyi ya nickel-cobalt ferrous yomwe imapangidwira mofanana ndi Fernico, yopangidwa kuti igwirizane ndi mawonekedwe a thermal exPAN SIon a galasi la borosilicate (~5 × 10?6 /K pakati pa 30 ndi 200 °C, mpaka ~10 × 10?6 /K pa 800 °C) kuti ilole kulumikizana mwachindunji kwa makina pa kutentha kosiyanasiyana. Imagwiritsidwa ntchito m'ma conductors opangidwa ndi electroplated omwe amalowa m'ma envelopu agalasi a zida zamagetsi monga machubu a vacuum (ma valves), machubu a X-ray ndi ma microwave ndi mababu ena amagetsi.
Dzina lakuti Kovar nthawi zambiri limagwiritsidwa ntchito ngati mawu wamba a Fe-Ni alloys okhala ndi mawonekedwe awa a thermal expAN SIon. Onani Fe-Ni alloy Invar yofanana yomwe imawonetsa thermal expAN SIon yochepa.

Alloy-4J29 idapangidwa kuti ikwaniritse kufunikira kwa chisindikizo chodalirika chagalasi kukhala chitsulo, chomwe chimafunika muzipangizo zamagetsi monga mababu amagetsi, machubu a vacuum, machubu a cathode ray, ndi machitidwe a vacuum mu chemistry ndi kafukufuku wina wasayansi. Zitsulo zambiri sizingathe kutseka galasi chifukwa kuchuluka kwawo kwa kutentha kwa expAN SIon sikofanana ndi galasi, kotero pamene cholumikizira chimazizira pambuyo popangidwa, kupsinjika chifukwa cha kusiyana kwa expAN SIon kwa galasi ndi chitsulo kumapangitsa cholumikiziracho kusweka.

Alloy-4J29 sikuti imangokhala ndi kutentha kwa SIon kofanana ndi galasi, komanso kakhoma kake ka thermal expAN SIon kamene kamakhala kosagwirizana ndi galasi, zomwe zimapangitsa kuti cholumikiziracho chizitha kupirira kutentha kwakukulu. Mwa mankhwala, chimalumikizana ndi galasi kudzera mu gawo lapakati la oxide la nickel oxide ndi cobalt oxide; gawo la iron oxide ndi lochepa chifukwa cha kuchepa kwake ndi cobalt. Mphamvu ya cholumikiziracho imadalira kwambiri makulidwe ndi khalidwe la gawo la oxide. Kukhalapo kwa cobalt kumapangitsa kuti gawo la oxide lisungunuke mosavuta ndi kusungunuka mu galasi losungunuka. Mtundu wa imvi, imvi-buluu kapena imvi-bulauni umasonyeza chisindikizo chabwino. Mtundu wachitsulo umasonyeza kusowa kwa oxide, pomwe mtundu wakuda umasonyeza chitsulo chosungunuka kwambiri, m'zochitika zonsezi zomwe zimapangitsa kuti cholumikiziracho chikhale chofooka.

Amagwiritsidwa ntchito makamaka mu zida zamagetsi zoyeretsera mpweya ndi zowongolera mpweya, chubu chogwedeza, chubu choyatsira moto, magnetron yagalasi, trAN SIstors, pulagi yotsekera, relay, lead ya ma circuits ophatikizidwa, chassis, mabracket ndi zina zotsekera nyumba.

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Mphamvu Yokoka, MPa

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Koyefifiti ya expAN SIon

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