Fig.3 Microstructures of self-protective paste boronizing specimens at different boronizing temperature with rare earth added （a）850℃,（b）700℃,（c）680℃ 3.3 The influence of the amount of rare earth added on the boron effect To study the influence of the amount of rare earth added on the boron effect, 7wt%、8wt%、9wt% and 10wt% rare earth were chosen to add into the boron paste respectively, the addition of the amount of KBF4 and that of B4C were the same in each boron experiment, the same self-protective paste and the same boronizing processes were adopted, when the boron temperature was at 800 , ℃ the microstructures of the self-protective paste boron samples with different amount of rare earth added were shown in Fig.4. (a) 20μm (b) 20μm 20μm (c) 20μm (b) 20μm (a)
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