- 期刊
Physical and Chemical Dispersion Effects on the Preparation of Ni-AI2O3 Composite Coating
物理及化學分散對鎳／氧化鋁複合鍍層的影響
摘要
表面帶電荷的氧化鋁粒子（80nm）在攪拌良好的瓦特鍍浴（Watts bath）中易聚集成平均粒徑約1109 nm的粒子團。此聚集的粒子團可經由施加超音波能量的方法降至粒徑約為162 nm，或者在電解液中添加界面活性劑的方法降至粒徑約為318nm，在此電化學複合鍍層中，氧化鋁粒子的體積含量受到粒子在電解液中分散效果的影響。雖然物理分散方法對電解液中氧化鋁粒子的分散效果優於化學分散方法，但化學分散方法所獲得的複合鍍層性質則優於物理分散方法所獲得的複合鍍層。添加陽離子界面活性劑CTAB可使氧化鋁鈍性粒子吸附於陰極表面的能力教之施加超音波能量更好。複合鍍層獲得較高的氧化鋁粒子體積含量（6.8 vol％），同時也得到較佳的硬度（470 Hv）。
關鍵字
無資料並列摘要
Charged alumina fine particles (80 nm) easily agglomerated into larger particles with an average diameter about 1109 nm in a well-stirred concentrated Watts bath. However, the average diameter of the agglomerated particles could be easily reduced to 162 nm and 318 nm, respectively, by means of physical dispersion through the application of supersonic energy, and by means of chemical dispersion through the addition of surfactants to this electrolyte. The volume content of alumina particles in the electrochemical composite coating depended on the dispersal effect of alumina particles in the electrolyte. Although the applied supersonic energy in the Watts bath electrolyte had a better dispersion effect than the particles promoted the attractive force between the agglomerates and the cathode surface, as well as a higher volume content of alumina particles in the Ni-Al2O3 composite coating (6.8 vol%) was obtained. Better hardness (470 Hv) was also found in this composite coating.