摘要
设计了 3种不同的装罐方法 ,通过改变试样与渗剂的接触方式 ,对固体渗硼时渗剂中活性硼原子输运到试样表面的方式进行了研究。结果表明 ,固体渗硼时 ,渗剂中有BF2 和BF3 气体生成 ,活性硼原子通过BF2 在试样表面的吸附和分解以及在渗剂中的直接扩散这样两种方式输运至试样表面 ,其中活性硼原子在渗剂中的直接扩散是主要输运方式。BF2 在渗硼中的主要作用是充当了还原剂的作用 ,通过它和BF3 间的循环反应 ,将硼砂中的氧化硼源源不断地还原成活性硼原子 ,同时它在渗剂中的吸附和分解也加快了渗剂中活性硼原子的生成速度。
Three different pack box techniques, which change the contacts between samples and boronizing agent, were designed to investigate how the activated boron atoms are transferred onto the sample surface during pack boronizing. It shows that the gases BF 2 and BF 3 are formed in the agent, and there are two transfer ways of activated boron atoms in the agent: gas BF 2 being absorbed and decomposed on the sample surface and activated boron atoms diffusing into sample surface directly, the later is the main transfer way. The gas BF 2 does not act as the medium of conveying boron atoms, but acts as the reductant during boronizing. The boron oxide in borax is continually reduced into activated boron atoms through circulating reaction between BF 2 and BF 3, at same time, the speed of forming activated boron atoms in the agent is also increased through the gas BF 2 absorbed and decomposed in the agent.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2003年第2期29-32,共4页
Transactions of Materials and Heat Treatment
关键词
固体渗硼
活性硼原子
输运方式
扩散
pack boronizing
activated boron atoms
transfer ways
diffusion
