1. Txoj kev ua kom huv ntawm cov khoom siv raw Vim tias WBN, HBN, pyrophyllite, graphite, magnesium, hlau thiab lwm yam impurities tseem nyob hauv CBN hmoov;Tsis tas li ntawd, nws thiab cov binder hmoov muaj adsorbed oxygen, dej vapor, thiab lwm yam, uas yog qhov tsis zoo rau sintering.Yog li ntawd, txoj kev purification ntawm r ...
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