Effect of particle size on sintering behaviours and capacitance characteristics of porous Ta compacts

摘要

Ta has been mainly used for capacitor. Recently, electrolytic capacitor of Ta has been demanded tobe smaller size and higher performance. But, there is few reports about sintering of Ta. Then, in thiswork, the sintering behaviors and the capacitance of porous Ta sintered by capsule free RIP sinteringand vacuum sintering about two kinds of Ta powders with different particle size of l.7μm (No.A)and 3.5μm (No.B), were discussed. The relative density of sintered Ta compact was independenton particle size of starting powder and increased with an increase in sintering temperature andsintering time. The coarsening of grain increased markedly in the compact sintered from smallerparticles as compared to the compact from larger particles. The capacitance of sintered compactfrom No.A was larger than that from No.B. Tanδ of No.B was smaller than that from No.A.