Ceramic PCB Via futhi Metallization: Umhlahlandlela Technical

Isingeniso: Ngezakhiwo kuma-Ceramic PCBs

Izakhiwo ezisebenzisa ama-PCB e-ceramic zisebenza imisebenzi emibili ebalulekile: ukusungula ukuxhumana kukagesi phakathi kwezingqimba zesekethe kanye nokuhlinzeka ngezindlela zokuqhuba ukushisa eziphumelelayo kusukela ezingxenyeni ezikhiqiza ukushisa kuya kuma-heat sink. Ngokungafani namabhodi endabuko e-FR-4, ama-ceramic substrates akhiwe yi-alumina (Al₂O₃), i-aluminium nitride (AlN), noma i-silicon nitride (Si₃N₄) ayizinto ezingezona eziqhuba ukushisa ngokwemvelo.

Lesi sici esiyisisekelo sisho ukuthi i-via kanye ne-metallization kuma -PCB e-ceramic kumele kuncike ngokuphelele ezinqubweni ezikhethekile zokufakwa kwensimbi kanye nokugcwalisa ukuze kudalwe ukuxhumana okuthembekile phakathi kwezingqimba. Ikhwalithi yalezi zakhiwo ze-metalized via inquma ngqo kokubili ukusebenza kukagesi kanye nekhono lokuphatha ukushisa kwenhlangano eqediwe.

I-Ceramic PCB Ngezinhlobo Nokucushwa

Ukuqonda i-PCB ye-ceramic ehlukahlukene ngokulungiselela kuvumela abaklami ukuthi bathuthukise ukusebenza kwesifunda kwezinhlelo zokusebenza ezithile. Ngalunye ngohlobo lunikeza izinzuzo ezihlukile ngokuya ngokuguquguquka komzila wesiginali, ukusebenza okushisayo, kanye nobunzima bokukhiqiza.

Nge-Hole Vias

Ama-vias adlula ngembobo angena kulo lonke ugqinsi lwe-ceramic substrate, adala indlela eqhubekayo yokuqhuba ugesi kusukela phezulu kuya phansi. Lezi zakhiwo zinikeza amandla amahle kakhulu okuthwala ugesi kokubili ukudlulisa isignali kanye nokusabalala kokushisa. Indawo enkulu kakhulu yezingxenye zokulungiswa kwembobo edlulayo inikeza ukumelana okuphansi kukagesi kanye nokuqhuba okuphezulu kokushisa uma kuqhathaniswa nokuncane ngejometri.

Izimpumputhe Nezingcwatshwa Ngezindlela

Izimbobo eziyimpumputhe zinwebeka ukusuka kungqimba olungaphandle ziye kwezendlalelo zangaphakathi ngaphandle kokungena kuyo yonke i-substrate, kuyilapho izimbobo ezingcwatshiwe zikhona ngaphakathi kwezendlalelo zangaphakathi. Lezi PCB ze-ceramic ezithuthukisiwe ngezakhiwo zinika amandla ukuminyana kwesekethe ephakeme ngokukhulula indawo engaphezulu. Izinzuzo ezibalulekile zifaka:

• Ukuthuthukisa isikhala - Indawo engaphezulu ihlala itholakala ukuze kubekwe ingxenye eyengeziwe kanye nomzila.
• Ubuqotho besignali - Imiphumela encishisiwe ye-stub inciphisa ukuphazamiseka kwe-electromagnetic phakathi kwezingqimba zesekethe.
• Ikhono lokuminyana okuphezulu - Ibalulekile kumamojula e-RF, ama-sensor array, nama-miniaturized assemblies.

Ubunkimbinkimbi bokukhiqiza buyanda ngalezi zakhiwo, okudinga ukuqondanisa okunembayo kwesendlalelo ngesikhathi sokwenziwa.

Kugcwaliswe nge-Vias

I-PCB egcwele i-ceramic ngokusebenzisa izilungiselelo ifaka izinto zokuhambisa ezifana nethusi, isiliva, i-tungsten, noma i-molybdenum ngaphakathi kwebhareli le-via. Lokhu kususa isikhungo esingenalutho sama-via afakwe kuphela, okuthuthukisa kakhulu ukuhanjiswa kokushisa kanye nobuqotho besakhiwo. Izinhlelo zokusebenza ezidinga ukushabalaliswa kokushisa okuphezulu, njengamamojula e-LED kanye ne-elekthronikhi yamandla, ngokuvamile zichaza ama-via agcwele okushisa ukuze kudalwe izindlela zokudlulisa ukushisa eziphumelelayo nge-substrate.

I-Metallization Techniques ye-Ceramic PCB Vias

Inqubo ye-metalization inquma amandla okunamathela, ukuqhutshwa kukagesi, nokuthembeka kwesikhathi eside kwe-ceramic PCB ngezakhiwo. Amasu ahlukene ahambisana nezinto ezihlukene ze-substrate nezidingo zokusetshenziswa.

I-Thick-Film Metallization

Ukwenziwa kwensimbi okujiyile kuhilela ukunamathisela kwesikrini okunezinhlayiya zensimbi ebusweni be-ceramic, kulandelwe ukushiswa kokushisa okuphezulu. Ama-paste esiliva ne-tungsten amelela izinto ezivame kakhulu, isiliva linikeza ukuqhutshwa okuhle kakhulu kanye ne-tungsten enikeza ukunamathela okuphezulu kuma-substrate e-alumina. Le ndlela idala izendlalelo zomqhubi ngokuvamile ezisukela kubukhulu obuyi-10 kuya ku-25 micrometer.

Inqubo ithatha i-ceramic PCB ngokugcwalisa ngokuphrinta unamathisele emigodini eyakhiwe ngaphambili ngaphambi kokucwiliswa. Ukulungiswa kwesici kukhawulela le nqubo kumasekhethi anobubanzi bomugqa obungaphezu kwama-micrometer angu-100.

I-Thin-Film Metallization

Izinqubo zefilimu encane zisebenzisa amasu okufaka i-vacuum njengokukhipha amanzi noma ukuhwamuka ukuze kudalwe izendlalelo zensimbi ezingaphansi kobukhulu bama-micrometer angu-5. Lezi zindlela zivumela ukujikeleza komugqa omncane ngezici ezifinyelela kuma-micrometer angu-20, ezilungele ukusetshenziswa kwemvamisa ephezulu kanye nezindawo ezincane.

Indlela yefilimu emincane ye-ceramic PCB ngokwakheka ngokuvamile ihlanganisa ukufakwa kwe-sputter ukuze kudalwe ungqimba lwembewu, iphethini ye-photolithographic, kanye ne-electroplating ukuze kuhlanganiswe ugqinsi. Lokhu kufeza ukulawulwa okuhle kakhulu kwe-dimensional yezakhiwo eziyinkimbinkimbi zezendlalelo eziningi.

I-Direct Copper Bonding kanye ne-Active Metal Brazing

I-Direct copper bonding (DCB) idala isibopho se-metallurgical phakathi kwe-copper foil nama-ceramic substrates ngokusebenzisa i-oxidation yezinga eliphezulu lokushisa, okukhiqiza amandla okunamathela akhethekile. Inqubo idala izendlalelo zethusi ngokuvamile ezinobukhulu obungamamilimitha angu-0.3 ukuya kwangu-0.8 ezisingatha imithwalo yamanje ephezulu. I-Active metal brazing (AMB) isebenzisa izinsimbi ezisebenzayo njenge-titanium ukuze ikhuthaze ukuhlangana kwamakhemikhali phakathi kwendawo yethusi neyeceramic.

Lawa masu okusebenza ahlinzeka nge-metallization eqinile yamamojula wamandla kodwa adinga ukuphathwa ngokucophelela kokushisa ngenxa ye-coefficient yokungafani kokunwetshwa kokushisa. Ukuhlanganiswa ne-ceramic PCB ngokusebenzisa izakhiwo ngokuvamile kwenzeka ngokubhoboza okulandelayo kanye ne-electroplating.

I-Electroplating ye-Via Metallization

Ukufakwa kwe-electroless plating okulandelwa yi-electrolytic plating kumelela indlela evamile yokusansimbi ngezindonga kuma-substrates e-ceramic. I-electroless deposition idala ungqimba lwembewu oluzacile ngokunciphisa amakhemikhali, okuvumela ukunqwabelana kwe-electrolytic okulandelayo kugqinsi lwethusi olufunekayo. Le PCB ye-ceramic ngokulandelana kwe-metallization ifinyelela ukumbozwa okufanayo ngisho nasezimbotsheni ze-aspect-ratio ephezulu.

Inqubo idinga ukulungiswa ngokucophelela kwendawo okuhlanganisa izinyathelo zokuhlanza kanye zokwenza kusebenze ukuze kuqinisekiswe ukunamathela okufanele. Ikhemikhali yokucwenga kufanele ilungiselelwe izinto ezithile ze-ceramic ukuze kuvinjelwe i-voids noma i-delamination.

Ngokugcwalisa kanye nokuthembeka kwe-Ceramic PCB

Ukuthembeka kwesikhathi eside kwe-ceramic PCB ngezakhiwo kuncike kakhulu ekugcwaliseni izinto zokwakha, ukulawulwa kwenqubo, kanye nokwenza kahle kokuklama ukuphatha ingcindezi phakathi kwezinto ezingafani.

Izinto Zokugcwalisa kanye Nezindlela

Ukukhetha okubalulekile kwe-ceramic PCB ngokugcwalisa ibhalansi ukusebenza kukagesi, ukuqhutshwa kwe-thermal, kanye ne-coefficient yokufanisa ukunwetshwa okushisayo:

• Ukugcwaliswa kwethusi - I-conductivity ephezulu kakhulu kagesi kanye ne-thermal kodwa idinga ukuvimbela i-oxidation ngesikhathi sokusebenza okuphezulu kwezinga lokushisa.
• I-Silver paste - Ukuhambisana okuhle nokucutshungulwa kwefilimu ewugqinsi ngezidingo ezishisayo ezimaphakathi.
• I-Tungsten ne-molybdenum - Ama-coefficients wokunweba okushisayo eduze kwe-ceramics anciphisa ingcindezi kodwa amukele ukuqhutshwa okuphansi.

I-sintering esizwa nge-vacuum kanye ne-electroplating elandelanayo imelela izindlela ezinokwethenjelwa kakhulu zokwenza izakhiwo ezingenalutho ezigcina ubuqotho ngokusebenzisa amabhayisikili ashisayo.

Ukungafani Kokwandiswa Kokushisa Okushisayo

I-coefficient yomehluko wokunwebeka okushisayo phakathi kwama-substrates e-ceramic kanye ne-metallic ngokugcwalisa idala ingcindezi yemishini phakathi nohambo lwezinga lokushisa. I-Alumina ibonisa ukunwebeka okushisayo cishe kuka-7 ppm/°C, kuyilapho ithusi likhula cishe ngo-17 ppm/°C, lidala ingcindezi enkulu ezindaweni ezihlanganayo ze-ceramic-metal.

Amasu okunciphisa ahlanganisa ukukhetha izinto zokugcwalisa ngama-coefficient eduze ne-substrate, ukulawula nge-geometry ukuze kuncishiswe ukugxiliswa kwengcindezi, kanye nokuhlanganisa izici ezikhulula ukucindezeleka ekwakhiweni kwe-metallization. Amaphrothokholi okuhlola kufanele abandakanye ukuhamba ngebhayisikili okushisayo phakathi kwezinga lokushisa elimele indawo ehlosiwe yohlelo lokusebenza.

Ukuhlola Ukwethembeka kanye Nezindlela Zokwehluleka

Ukuhlolwa okuphelele kokuthembeka kwe-ceramic PCB ngezakhiwo kuhlanganisa ukuhlolwa kukagesi, ukuhamba ngebhayisikili okushisayo, ukuhlolwa kokucindezeleka kwemishini, nokuhlola okungabhubhisi. Izindlela zokwehluleka ezijwayelekile zihlanganisa:

• Ugesi uyavula - Ukusakazwa kwe-crack ngokusebenzisa umgqomo kuphazamisa ukugeleza kwamanje.
• Ukwenyuka ukumelana - Ukwakheka okungenalutho noma ukufuduka kwensimbi kwehlisa ukusebenza kukagesi.
• Izixhumanisi zangaphakathi - Ukukhathala okushisayo ezindaweni ezibonakalayo kubangela izinkinga zokuthembeka kokuxhumana.

I-microscopy yezingxenye ezihlukene yembula amaphutha angaphakathi kuyilapho imaging ye-X-ray inika amandla ukuhlolwa okungonakali kwekhwalithi yokugcwalisa. Ukuqinisekiswa kwedizayini kufanele kubandakanye ukuhamba ngebhayisikili kwezinga lokushisa ukusuka ku -55°C kuya ku-+150°C noma ngaphezulu kuye ngezidingo zohlelo lokusebenza.

Ukuklama Nokuthuthukisa Inqubo ye-Ceramic PCB Vias

Izinketho zedizayini zamasu kanye nokuthuthukiswa kwenqubo yokukhiqiza kukhulisa i-PCB yobumba ngokusebenzisa ukusebenza ngenkathi kugcinwa ukusebenza kahle kwezindleko nokwenziwa.

Nge-Distribution and Thermal Path Design

Ukuthuthukisa ngokubeka okuhlobene nezinto ezikhiqiza ukushisa kudala izindlela ezisebenza kahle zokushisa ezinciphisa amazinga okushisa okuhlangana. Izingxenye zamandla aphezulu ziyazuza kumalungu afanayo ama-vias ashisayo abekwe ngokuqondile ngaphansi kwesigxivizo sonyawo sedivayisi ukuze asabalalise ukushisa ezindaweni ezinkulu zethusi noma osinki bokushisa bangaphandle.

Ngephimbo nobubanzi kufanele kulinganisele ukusebenza okushisayo ngokumelene nokwethembeka komshini, nokubukeka okulinganiselwe okuvamise ukugcinwa ngaphansi kuka-10:1 ngezinqubo ezivamile zokucwenga. Okuminyene ngama-arrays ngaphansi kwama-semiconductors amandla kunciphisa kakhulu ukumelana nokushisa.

Ukucatshangelwa Kwezokukhiqiza

Imikhawulo yamandla enqubo ibeka izithiyo ezisebenzayo ku-PCB ye-ceramic ngokusebenzisa imingcele yedizayini. Ubuncane be-diameter ngokujwayelekile busukela ku-0.15 kuya ku-0.30 amamilimitha kuya ngogqinsi lwe-substrate kanye nendlela yokumba, ngokumba nge-laser okuvumela izici ezincane kunomshini wokumba.

Izidingo zogqinsi lwe-metallization zincike kumthamo ophethe njengamanje futhi kufanele zibhekele ukujiya okuncishisiwe kwe-plating ezindaweni eziqhathaniswa nezindawo zokungena. Abakhiqizi kufanele basungule izindlela zokulawula inqubo okuhlanganisa nesilinganiso sokumelana, ukuhlaziywa kwe-metallization cross-section analysis, kanye nokuhlolwa kwe-thermal impedance.

Ukusebenzisana Nomkhiqizi Onekhono We-Ceramic PCB

Ukuzuza i-PCB ye-ceramic enokwethenjelwa ngezakhiwo kudinga imishini ekhethekile, ubuchwepheshe bezinqubo, nezinhlelo zokulawula ikhwalithi ezitholwa ngabakhiqizi abanolwazi kuphela. Ukusebenzisana okuyinkimbinkimbi phakathi kwezakhiwo ze-substrate, i-metallization chemistry, kanye nokucubungula okushisayo kudinga ulwazi olujulile lobuchwepheshe oluqoqwe ngesipiliyoni sokukhiqiza.

Izikhungo zokukhiqiza kumele zigcine amandla okumba ngokunemba noma ukukhipha nge-laser, amasu amaningi e-metalization afaka izinqubo zefilimu ewugqinsi nefilimu emincane, i-controlled atmosphere sintering, kanye ne-electroplating enokulawula ukujiya okunembile.

I-Highleap Electronics iletha amakhono aphelele okukhiqiza i-ceramic substrate kufaka phakathi izinqubo ezithuthukisiwe zokwakheka, i-metallization, kanye nokugcwalisa ezakhiwe ngomsebenzi omkhulu ngezinto ze-alumina, i-aluminium nitride, kanye ne-silicon nitride. Ithimba lethu lobunjiniyela lihlinzeka ngomklamo wokuhlaziywa kokukhiqiza ukuze kulungiselelwe ngokucushwa kokusebenza kanye nokukhiqiza. Sikumema ukuthi uthumele amafayela akho okuklama ukuze uthole ukuhlolwa okuningiliziwe kokwenzeka kanye nezincomo zenqubo ezenzelwe izidingo zakho ezithile zesicelo.