热处理对镀银粉煤灰复合粉体组织与性能的影响

发布时间：2018-01-07 02:30

  本文关键词：热处理对镀银粉煤灰复合粉体组织与性能的影响　出处：《热加工工艺》2014年24期 　论文类型：期刊论文

  更多相关文章： 粉煤灰 热碱活化 化学镀银 热处理 电阻率

【摘要】：粉煤灰经热碱液活化后,采用葡萄糖作还原剂,通过向碱性溶液中缓慢滴入Ag NO3溶液的方法制备了镀银复合粉体。采用扫描电镜、能谱仪和X射线衍射进行形貌观察及成分分析,并探讨了热处理对镀银复合粉体的影响。结果表明:热处理对镀银复合粉体的导电性和晶粒尺寸影响较大。随保温温度的升高,复合粉体的电阻率先减后增,而镀层的平均晶粒尺寸则一直在增大;随保温时间的延长,电阻率和晶粒尺寸都呈先减后增的趋势。适当的热处理能够消除镀层生长缺陷,改善复合粉体的导电性。镀银复合粉体在250℃保温40 min后电阻率达到0.011Ω·cm。
[Abstract]:Silver plated composite powder was prepared by slowly dripping silver NO3 solution into alkaline solution with glucose as reductant after activation of fly ash by thermal alkali solution. Scanning electron microscope (SEM) was used. The morphology and composition were observed by energy spectrometer and X-ray diffraction. The effect of heat treatment on the silver plating composite powder is discussed. The results show that the heat treatment has a great effect on the electrical conductivity and grain size of the silver plated composite powder. With the increase of the holding temperature, the resistance of the composite powder decreases first and then increases. The average grain size of the coating has been increasing. With the increase of the holding time, the resistivity and grain size decreased first and then increased. Proper heat treatment can eliminate the growth defects of the coating. The electrical conductivity of the composite powder was improved. The resistivity of the silver plated composite powder reached 0.011 惟 路cm ~ (-1) after holding at 250 鈩，

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