(Kovar to Alumina IgiceTanga umusaruroWintrustek)

I. Incamake ya Kovar

Kovar ni icyuma-nikel-cobalt gishingiye ku kwaguka kwagutse cyane cyane icyingenzi ni uko coeffisiyeti yo kwagura amashyuza ihuye n’ibirahure bikomeye hamwe n’ubutaka (nka alumina) mu bipimo by'ubushyuhe runaka. Iyi mikorere ituma iba ikintu cyingenzi cyo gufunga ibikoresho bya elegitoroniki, icyogajuru, lazeri, nizindi nganda. Ubusanzwe ikoreshwa muguhimba ibyuma byo gufunga imiti hamwe nikirahure cyangwa ububumbyi.

Ijambo "4J" ryerekana ibivanze neza mu rwego rw’igihugu cy’Ubushinwa (GB) byerekana ibinyobwa bifite imiterere yo kwaguka "byegereza" (J) agaciro runaka.

II. Isesengura rirambuye ryamanota atatu ya Kovar

Ubusanzwe: Bose uko ari batatu bashingiye kuri Fe-Ni-Co kandi bafite imiterere yo kwaguka isa nikirahure gikomeye nubutaka. Ubushyuhe bwo kwagura ubushyuhe, ubushyuhe bwa Curie, nibiranga ubukanishi biratandukanye cyane bitewe nimpinduka nkeya.

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

Ibigize bisanzwe:Fe-29Ni-17Co, hiyongereyeho ibintu bito byangiza nka manganese na silicon.

Kwagura Ibiranga: Impuzandengo yo kwagura umurongo ugereranije ihuye cyane na DM-308 molybdenum-groupe hamwe na 92-96% ceramique ya alumina kurwego rwa 20-450 ° C.

Ibipimo by'ingenzi:

• Ubushyuhe bwa Curie: Hafi ya 430 ° C (gutakaza ferromagnetic hejuru yubushyuhe).

• Ibikoresho byo guhuza: Ceramics-alumina yo hejuru, ibirahuri bya molybdenum.

• Kuvura Ubuso: Mubisanzwe bisaba nikel cyangwa zahabu kugirango byongerwe imbaraga kandi birwanya ruswa.

• Porogaramu y'ibanze: Imiyoboro ya Microwave, laseri, amazu yumuzunguruko, inzu yizewe cyane, icyogajuru gifunze.

2. 4J33 na 4J34 (Kovar yatunganijwe)

Iyi mvange ni variants zakozwe kugirango zikemure ibitagenda neza kuri 4J29 (nka coefficient zo hejuru zo kwagura ubushyuhe buke), zigaragaza ubushyuhe bwinshi bwa Curie.

Itandukaniro ryibigize:

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

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

Kwagura Ibiranga:Ku bushyuhe bwicyumba bugera kuri 300 ° C, coefficent yo kwaguka iri munsi gato ya 4J29, itanga guhuza neza nibirahuri byihariye cyangwa ububumbyi.

Ibyiza by'ingenzi - Ubushyuhe bwo hejuru bwa Curie:

• 4J29: ~430°C

• 4J33: ~500°C

• 4J34: ~480°C

Akamaro:Ubushyuhe bwo hejuru bwa Curie butuma ibikoresho bikomeza kuba magnetique ku bushyuhe bwo hejuru bwo gukora, bikarinda kwangiriza magneti hamwe n’ibikoresho byinshi, byuzuye neza.

Guhitamo Porogaramu: Bikwiranye nubushyuhe bwo hejuru bwibidukikije cyangwa porogaramu zikoresha magnetiki, cyangwa byatoranijwe hashingiwe ku kwagura umurongo uhuza ibizamini hamwe nibikoresho byihariye byo gufunga.

III. Ibyiza Byiza bya Brazing Kovar hamwe na Alumina Ceramics

Gufunga ibyuka bya kashe ya Kovar na alumina ceramics ukoresheje brazing ni tekinoroji yingenzi mugupakira ibikoresho bya elegitoroniki bigezweho, hamwe nibyiza byibanze bikurikira:

1. Guhuza Ubushyuhe budasanzwe bwo Kwiyongera (Inyungu zifatizo)

Iyo gukonjesha kuva kurisha kugeza ubushyuhe bwicyumba, igipimo kimwe cyo kugabanuka kwibikoresho byombi bigabanya cyane imbaraga zumuriro usigaye hamwe. Ibi bikuraho neza kuvunika ceramic hamwe no kuvunika ibice byavunitse, bikavamo kwizerwa ntarengwa.

2. Kugera kuri gaz nyinshi

Ibipimo bya Helium muri sisitemu ikuze akenshi bigwa munsi ya 1 × 10⁻⁸ Pa · m³ / s kubice bifunze, bigatandukanya neza ubuhehere bwo hanze na ogisijeni. Ibi byujuje ibyangombwa bisabwa cyane mu kirere, mu gisirikare, no mubindi bisabwa cyane.

3. Imbaraga zisumba izindi mashini hamwe nubunyangamugayo

Kovar provides imbaraga zumukanishi nubukomere, mugihe alumina ceramics itanga insulasiyo nziza kandi ikomeye. Gucisha make ibyo bikoresho bivamo imiterere ikomeye hamwe nuburyo bukingira kandi bukora.

4. Inzira zikuze kandi zizewe cyane

Hubatswe urunigi ruhoraho, rurimo ibyuma bya ceramic (tekinike ya molybdenum-manganese), isahani ya nikel, guteranya hamwe nibice bya Kovar, hamwe na vacuum / ibidukikije bikingira. Inzira irashobora kugenzurwa cyane, ibereye kubyara umusaruro, kandi itanga umusaruro mwinshi hamwe nubwiza buhoraho.

IV. Incamake Kugereranya no Guhitamo Ibyifuzo

Ⅴ. Umwanzuro

Mu muryango wa Kovar, 4J29 nigikoresho gisanzwe kandi gisabwa kugirango ushakishe ceramika yo hejuru-alumina, itanga impirimbanyi nziza yimikorere, igiciro, no kwiringirwa. 4J33 / 34 niterambere ryimikorere kubikorwa byihariye bisaba ubushyuhe bukomeye bwo gukora cyangwa ibintu bidafite imbaraga.Brazing ya Kovar hamwe nubutaka bwa alumina.