(Kovar ukuya kwinxalenye yeAluminaVelisa ngeWintrustek)

I. Isishwankathelo seKovar

I-Kovar yi-iron-nickel-cobalt-based expansion alloy eyona nto iphambili kukuba i-coefficient yokwandisa i-thermal ihambelana nezinye iiglasi ezinzima kunye neeseramics (ezifana ne-alumina) kuluhlu oluthile lobushushu. Eli nqaku liyenza ibe yinto ebalulekileyo yokutywina kwipakethe ye-elektroniki, i-aerospace, iilaser, kunye namanye amashishini. Ngokuqhelekileyo isetyenziselwa ukwenza izinto zentsimbi zokutywinwa kwe-hermetic ngeglasi okanye iiseramikhi.

Igama elithi "4J" lee-alloys ezichanekileyo phantsi komgangatho wesizwe waseTshayina (GB) limele ingxubevange eneempawu zokwandisa "ukusondela" (J) ixabiso elithile.

II. Uhlalutyo olunzulu lwamaBanga amathathu eKovar

Okuqhelekileyo: Zontathu zisekelwe kwi-Fe-Ni-Co kwaye zineempawu zokwandisa ezifana neglasi enzima kunye neekeramics. I-Thermal expansion curves, amaqondo obushushu eCurie, kunye neempawu zoomatshini zahluka kakhulu ngenxa yotshintsho oluncinci lokuqamba.

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

Uqulunqo oluqhelekileyo:I-Fe-29Ni-17Co, kunye nezongezo ezincinci ze-deoxidizing elements njenge-manganese kunye ne-silicon.

Ukwandiswa kweempawu: I-avareji yomgca wokwandiswa komlinganisi ohambelana kakhulu ne-DM-308 molybdenum-group glass kunye ne-92-96% yeeseramikhi ze-alumina kuluhlu lwe-20-450 ° C.

Iiparamitha eziphambili:

• Ubushushu beCurie: Malunga ne-430°C (ilahlekelwa ziimpawu ze-ferromagnetic ngaphezu kobu bushushu).

• Izinto ezihambelanayo: I-alumina ceramics ephezulu, iiglasi zeqela le-molybdenum.

• Unyango lwakumphezulu: Ngokuqhelekileyo kufuna i-nickel okanye i-gold plating ukunyusa ukunyameka kunye nokuxhathisa ukubola.

• Usetyenziso olusisiseko: Iiityhubhu zeMicrowave, iilaser, izindlu ezidityanisiweyo zeesekethe, iireyilayi ezithembeke kakhulu, iziqhagamshelo ezitywiniweyo ze-aerospace.

2. 4J33 kunye ne-4J34 (I-Kovar ephuculweyo)

Ezi alloys zizinto ezahlukeneyo eziphuhliswe ukujongana neziphene ze-4J29 (ezifana ne-coefficients yokwandisa ubushushu obuphantsi obuphezulu), ebonisa amaqondo aphezulu e-Curie.

Umahluko wokuqulunqwa:

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

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

Ukwandiswa kweempawu:Kwiqondo lobushushu begumbi ukuya malunga ne-300 ° C, i-coefficient yokwandiswa ingaphantsi kancinane kune-4J29, inikezela ukuhambelana okungcono kunye neeglasi ezithile ezikhethekileyo okanye iiseramics.

I-advanteji engundoqo-Ubushushu obuphezulu beCurie:

• 4J29: ~430°C

• 4J33: ~500°C

• 4J34: ~480°C

Ukubaluleka:Iqondo lokushisa eliphezulu leCurie liqinisekisa ukuba izinto zihlala zingenamagnetic kumaqondo okushisa aphakamileyo okusebenza, ukuthintela ukuphazamiseka kwamagnetic kunye nezixhobo eziphezulu, ezichanekileyo.

Ukukhethwa kweSicelo: Ifanele imeko-bume zobushushu obuphezulu okanye usetyenziso olunovakalelo ngokwemagnethi, okanye ikhethwe ngokusekelwe kuvavanyo lokwandiswa kwecurve enemathiriyeli yokutywina ethile.

III. Izinto eziluncedo ezingundoqo zeBrazing Kovar kunye neAlumina Ceramics

Ukutywinwa kwegesi okungagungqiyo kwi-hermetic ye-Kovar kunye neekeramics ze-alumina ngokubrawuza yitekhnoloji ebalulekileyo kwipakethe ye-elektroniki yale mihla, enezi nzuzo zilandelayo:

1. UkuMataniswa koKwandiswa kweThermal okuKhethekileyo (Inzuzo esisiseko)

Xa upholisa ukusuka kwi-brazing ukuya kwiqondo lokushisa, amaqondo afanayo okunciphisa zombini izixhobo anciphisa kakhulu uxinzelelo lwe-thermal olushiyekileyo kwindawo edibeneyo. Oku kuphelisa ngempumelelo i-ceramic cracking kunye ne-brazing seam fractures, okubangela ukuthembeka okuphezulu.

2. Ukufikelela kwiGesi ePhakamileyo yokuZimba

Amazinga okuvuza kwe-Helium kwiinkqubo ezivuthiweyo zihlala ziwela ngaphantsi kwe-1×10⁻⁸ Pa·m³/s kumacandelo atywiniweyo, ngokufanelekileyo ukwahlula ukufuma kwangaphandle kunye neoksijini. Oku kukhawulelana neemfuno eziqatha zokuxhomekeka kwi-aerospace, emkhosini, kunye nezinye izicelo ezibangwa kakhulu.

3. Amandla oomatshini aBalaseleyo kunye neMfezeko yoLwakhiwo

Kovar prI-ovides eyomeleleyo yenkxaso yoomatshini kunye nokuqina, ngelixa iiseramikhi zealumina zinika ukugquma okugqwesileyo kunye nobulukhuni. Ukuxutywa kwezi zixhobo kubangela ulwakhiwo oluqinileyo olunezixhobo zombini ezikhuselayo nezisebenzayo.

4. Iinkqubo zabantu abadala kunye nokuthembeka okuphezulu

Ikhonkco yenkqubo ehambelanayo iye yakhiwe, equka i-ceramic metallization (ubuchule be-molybdenum-manganese), i-nickel plating, i-assembly kunye ne-Kovar components, kunye ne-vacuum / ukukhusela indawo ekhuselekileyo. Inkqubo ilawuleka kakhulu, ilungele imveliso yobuninzi, kwaye ivelisa izivuno eziphezulu ezinomgangatho ohambelanayo.

IV. Uthelekiso olusisishwankathelo kunye neeNgcebiso zokuKhetha

Ⅴ. Ukuqukumbela

Ngaphakathi kwintsapho yaseKovar, i-4J29 yinto eqhelekileyo kunye nezinto ezicetyiswayo zokubhobhoza ii-ceramics eziphezulu ze-alumina, ukubonelela ngokulinganayo kokusebenza, iindleko kunye nokuthembeka. I-4J33/34 luphuculo lokusebenza kwizicelo ezithile ezifuna amaqondo obushushu aphezulu okusebenza okanye iimpawu ezingqongqo ezingenamagnetic.Ukugqatswa kweKovar ngeeseramikhi zealumina, exhaswa ngokuhambelana nokwandiswa kwe-thermal, ibe ngumgangatho woshishino wokupakishwa kwe-hermetic yokuthembeka okuphezulu kwe-elektroniki kunye ne-optoelectronic components.