1. Cov khoom xyaw
Tam sim no, feem ntau domestic thiab txawv teb chaws manufacturers siv cov khoom-theem synthesis technology. Cov khoom siv raw siv yog BaCO3, SrCO3, Pb3O4, TiO2, Nb2O5, MnCO3, SiO2 thiab lwm yam hmoov, thiab qhov purity feem ntau yuav tsum siab tshaj 99.5%. Lub purity ntawm raw cov ntaub ntawv, ntau yam thiab cov ntsiab lus ntawm impurities, tshuaj lom neeg kev ua si ntawm raw cov ntaub ntawv, thiab lwm yam. tag nrho cov muaj ib tug loj heev cuam tshuam rau lub functionality ntawm cov khoom kawg ntawm PTC. Qhov tseeb ntawm cov khoom xyaw kuj muaj txiaj ntsig zoo rau kev ua haujlwm ntawm cov khoom.
2. Pob zeb rhuav tshem thiab tshem tawm dej
Muab ob peb yam khoom hnyav hnyav, cov khoom sib tsoo, thiab dej ntshiab rau hauv lub pob zeb thiab rhuav tshem lawv, thiab sib tov sib npaug. Cov khoom siv pob zeb-milled tuaj yeem yooj yim muab tso rau hauv qhov cub kom qhuav, lossis lawv tuaj yeem qhuav tom qab dewatering los ntawm kev lim dej, kev sib cais centrifugal, nqus pom thiab lwm yam txuj ci.
Peb, khoom theem synthesis
Solid phase synthesis tseem hu ua calcination. Nws yog muab cov khoom sib xyaw ua ke rau hauv qhov cub kub kub rau cov tshuaj tiv thaiv los tsim cov khoom sib xws. Cov mis loj ntawm cov khoom siv tuaj yeem sau tau raws li (Ba x, Sr y, Pb z)TiO3, qhov twg x+y+ z=1, qhov kub ntawm cov khoom siv hluav taws xob yog xaiv los ntawm 1000 ~ 1250 ℃ raws li cov khoom siv thiab qhov sib piv, thiab lub sijhawm tuav yog 2 ~ 4 teev.
Plaub, lub pob zeb thib ob
Tom qab cov khoom sib xyaw ua ke, cov ntaub ntawv agglomerate thiab qee cov khoom siv lead ua loj tuaj, uas yuav tsum tau muab pov tseg los ntawm pob milling los pab txhawb kev tua. Cov txheej txheem ntawm ob lub pob milling yog zoo ib yam li lub pob milling ua ntej synthesis.
Tsib, tsim
PTC cov ntaub ntawv tuaj yeem ua rau ntau yam qauv, xws li: puag ncig, square, honeycomb, thiab lwm yam. Cov ntaub ntawv zoo li yog tsim los ntawm cov xovxwm qhuav, thiab cov kua nplaum PVA ntxiv rau cov khoom siv. Tom qab ntawd daim ntawv yog granulated los ntawm txoj kev sieving los yog tshuaj tsuag kom qhuav txoj kev, thiab ces nias-tsim ntawm lub tshuab xuas nrig ntaus. Honeycomb ntsiab yog tsim los ntawm cov txheej txheem extrusion.
Rau, tua
Muab cov ntawv ntsuab tsim rau hauv lub qhov cub kub, thiab raws li qhov tsim nyog tua hluav taws, tua cov khoom siv hluav taws xob semiconductor nrog cov yam ntxwv ntawm PTC. Qhov hluav taws xob nkhaus thiab hluav taws xob hluav taws xob muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm cov khoom, yog li nws yuav tsum tau tswj nruj me ntsis hauv kev tsim khoom los txhim kho cov khoom ua haujlwm thiab cov khoom lag luam.
PTC cov ntaub ntawv yog li BaTiO3-based semiconductor ceramic cov ntaub ntawv. Lub resistivity ntawm cov khoom no nce sharply nrog rau qhov nce nyob rau hauv qhov kub thiab txias nyob rau hauv ib qho chaw, thiab qhov kub ntawm lub resistivity nce dheev hu ua Curie kub. Curie kub ntawm BaTiO3 yog 120 ° C. Thaum Ba2+ hloov nrog ib daim ntawm Pb2+, nws dhau los ua Ba(1-X)PbX TiO3 cov khoom, thiab nws cov Curie kub nce nrog qhov nce ntawm Pb2+ cov ntsiab lus. Cov khoom siv PTC ua npaws tam sim no muaj qhov kub thiab txias ntawm 300 ° C.
PTC nyhuv ntawm BaTiO3 semiconductor ceramics originates los ntawm qhov txawv txav ntawm cov khoom' s dielectric tas li. Tom qab hloov Ba2+ nrog Pb2+, qhov txawv txav ntawm qhov dielectric tas li yog txo, yog li cov nyhuv PTC tsis zoo li cov khoom tsis muaj Pb. Lub npe hu ua PTC nyhuv yog qhov piv ntawm qhov loj heev tsis kam mus rau qhov me me heev nyob rau hauv cov khoom tsis kam-kub nkhaus. Cov nyhuv PTC ntawm qhov kub-kub PTC cov ntaub ntawv uas muaj Pb yog qhia nyob rau hauv daim duab 1 nrog rau kev hloov ntawm Curie kub TC. Tsis tas li ntawd, nrog rau kev nce qib ntawm Pb cov ntsiab lus, nws tsis yooj yim los tswj cov volatilization ntawm PbO roj thaum tua. Lub volatilization ntawm PbO roj thaum lub sij hawm firing deviates cov muaj pes tsawg leeg ntawm cov khoom PTC, ua rau nws tsis yooj yim sua kom tua ib tug ceramic lub cev nrog ib tug uniform layout. Rau cov laj thawj no, cov ntaub ntawv PTC kub siab tsis ntev npaum li cov ntaub ntawv PTC kub tsawg nrog lub neej ntev thiab kev ntseeg siab.