Nto ceramicization

Surface ceramization - plasma spraying thiab nws tus kheej-propagating kub kub synthesis
Plasma spraying ua rau DC arc ntawm cathode thiab anode. Lub arc ionizes cov roj ua haujlwm rau hauv cov ntshav plasma kub. Cov nplaim plasma yog tsim los yaj cov hmoov los ua cov tee dej. Lub siab tshaj tawm roj kwj atomizes cov tee dej thiab ces ejects lawv mus rau lub substrate. Qhov saum npoo tsim ib txheej. Qhov kom zoo dua ntawm cov tshuaj tsuag plasma yog tias cov tshuaj txau yog qhov kub thiab txias heev, qhov nruab nrab kub tuaj yeem ncav cuag 10 000 K, thiab txhua qhov kub melting point ceramic txheej tuaj yeem npaj tau, thiab txheej txheej muaj qhov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom. Qhov tsis zoo yog tias cov tshuaj txau ntau dua. Tsawg, thiab cov khoom siv kim heev, cov nqi peev ib zaug yog siab dua.

Self-propagating high-temperature synthesis (SHS) yog ib lub tshuab rau kev sib txuas cov ntaub ntawv tshiab los ntawm tus kheej ua cov tshuaj tiv thaiv siab kub ntawm cov reactants. Nws muaj qhov zoo ntawm cov khoom siv yooj yim, cov txheej txheem yooj yim, kev ua haujlwm siab, kev siv hluav taws xob tsawg thiab tsis muaj kuab paug. Nws yog ib qho kev siv tshuab saum npoo av uas tsim nyog rau kev tiv thaiv sab hauv ntawm cov kav dej. Ceramic hauv ob sab phlu npaj los ntawm SHS muaj cov yam ntxwv ntawm kev sib koom ua ke siab zog, siab hardness thiab corrosion kuj, uas tuaj yeem ua kom ntev lub neej ntawm cov kav dej. Lub ntsiab tivthaiv ntawm ceramic liner siv nyob rau hauv roj pipelines yog Fe + Al2O3. Cov txheej txheem yog sib xyaw ua ke ntawm cov hlau oxide hmoov thiab cov hmoov txhuas hauv cov yeeb nkab steel, thiab tom qab ntawd tig ntawm kev kub ceev ntawm lub centrifuge, ces ignite los ntawm hluav taws xob spark, thiab cov hmoov yog hlawv. Qhov kev hloov pauv tshwm sim tshwm sim los ua ib txheej molten ntawm Fe + Al2O3. Lub molten txheej yog txheej nyob rau hauv qhov kev txiav txim ntawm centrifugal quab yuam. Fe yog nyob ze rau ntawm phab ntsa sab hauv ntawm cov yeeb nkab steel, thiab Al2O3 tsim cov kab nrib pleb sab hauv kom deb ntawm cov yeeb nkab phab ntsa.