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本文介绍了粒状渗铬剂的研制,以中碳铬铁粉为供铬剂,NH_4Cl+KBF_4+NH_4F为活化剂,Al_2O_3为填充剂,经过球磨混料、雾化喷料,烘干后制成均匀的颗粒状渗铬剂。用几种钢材试样进行装箱渗铬,研究分析了不同温度下(880～1020℃),保持不同时间(2～8h)以及不同钢种对渗铬层深度的影响,并研究了渗铬剂重复使用的效果。渗铬后试样进行金相、X射线衍射和电子探针分析。研究结果表明,渗铬层显微硬度很高,耐磨性良好,且具有良好的抗腐蚀性和抗高温氧化性。本试验所研制的粒状渗铬剂具有良好的渗铬效果,装炉渗铬工艺操作简便。
In this paper, the development of granular chromizing agent is introduced. The medium carbon ferrochrome powder is used as chromium supplying agent, NH 4 Cl + KBF 4 + NH 4 F as activator and Al 2 O 3 as filler, after ball milling, atomizing and spraying, drying Uniform granular chromium agent. The effects of different steel grades on the depth of chromizing layer were studied by analyzing the effects of different temperature (880 ~ 1020 ℃), maintaining for different time (2 ~ 8h) The effect of repeated use of agents. After chromizing, the samples were analyzed by metallography, X-ray diffraction and electron probe. The results show that the chromizing layer has high microhardness, good wear resistance, good corrosion resistance and high temperature oxidation resistance. The granular chromium hydrometallurgy developed in this experiment has a good effect of chromizing, and the chromizing process in the furnace is easy to operate.