Cov ntsiab lus Cr thiab C cuam tshuam li cas rau qhov hnav tsis kam ntawm cov phaj hnav-resistant?

Cov pa roj carbon yog lub hauv paus tseem ceeb rau kev tsim cov carbides. Thaum muaj Cr, cov pa roj carbon sib xyaw nrog chromium los tsim cov chromium carbides (Cr₇C₃, Cr₃C₂, thiab lwm yam). Cov pa roj carbon ntau dua, cov carbide ntau dua, yog li ua rau cov khoom siv tawv thiab tiv taus kev hnav.

Chromium yog ib qho tseem ceeb rau kev tsim cov carbides tawv ruaj khov, thiab kuj muaj kev ruaj khov zoo hauv qhov kub thiab txias thiab tiv taus oxidation. Hauv lub kaw lus Cr siab, cov chromium carbide crystals loj hlob columnar thiab tau teeb tsa perpendicular rau qhov kev coj ua, uas pab tiv taus khawb thiab kev cuam tshuam hnav. Tsis tas li ntawd, Cr kuj tseem tuaj yeem ua lub luag haujlwm hauv kev ua kom zoo dua ntawm cov noob hauv qhov vuam thiab txhim kho qhov ceev ntawm lub koom haum.

Hauv kev tsim qauv, cov ntsiab lus Cr feem ntau yog tswj hwm ntawm 18% ~ 30%, thiab cov ntsiab lus C yog nruab nrab ntawm 3% ~ 5%. Qhov piv no tuaj yeem tsim ntau cov Cr₇C₃ hom carbides uas sib npaug zos nrog qhov nyuaj siab thiab cov coefficient sib txhuam qis, ua kom zoo dua cov khoom siv lub neej kev pabcuam nyob rau hauv qhov siab thiab cov xwm txheej cuam tshuam siab.