Firing characteristics of size-controlled silver–glass composite powders prepared by spray pyrolysis

• Published in: Powder technology 2010-03, Vol.198 (3), p.347-353
• Main Authors: Koo, Hye Young, Yi, Jang Heui, Ko, You Na, Kim, Jung Hyun, Kang, Yun Chan
• Format: Article
• Language: English
• Subjects: Applied sciences; Chemical engineering; Composite powder; Conducting powder; Conduction; Exact sciences and technology; Firing; Miscellaneous; Powder technology; Silver; Solid-solid systems; Spray pyrolysis; Sprayers; Sprays
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2009.11.030

Size-controlled spherical silver–glass composite powders were directly prepared by using spray pyrolysis. The mean sizes of the composite powders changed from 0.34 to 0.78 μm when the concentration of the spray solution was changed from 0.05 to 2 M. The firing characteristics of composite powders formed from the spray solutions with a glass content equal to 3 wt.% of the silver component were affected by the mean sizes of the powders. Silver-conducting films formed from large-sized composite powders had a denser structure than those formed from small-sized composite powders. Further, silver-conducting films formed from composite powders with a mean size of 0.78 μm had specific resistances of 3 and 2 μΩ cm at firing temperatures of 450 and 500 °C. However, silver-conducting films formed from composite powders with a mean size of 0.34 μm had specific resistances of 8.2 and 6.9 μΩ cm at firing temperatures of 450 and 500 °C. [Display omitted] Size-controlled silver–glass composite conducting powders with core–shell structure were prepared by spray pyrolysis. The mean sizes of the composite powders changed from 0.4 to 0.9 μm when the concentration of the spray solution was changed from 0.05 to 2 M. The electrical characteristics of the silver–glass composite were affected by the mean sizes of the powders.