Publication Date:
2013-11-21
Description:
In this study, the high stability temperature coefficient of capacitance (TCC) characteristics of (Ba,Ca)(Ti,Zr)O 3 -based multilayer ceramic capacitors (MLCCs) were investigated using a novel sintering approach that combines rapid heating and constrained sintering. The novel sintering approach is based on a sandwich structure that the constrained (Ba,Ca)(Ti,Zr)O 3 -based MLCCs are covered with BaTiO 3 as a constraining layer on both sides. An in-plane tensile stress resulting from the mismatch between the constraining layer and the constrained layer during heating can effectively inhibit grain growth of (Ba,Ca)(Ti,Zr)O 3 -based MLCCs and then modify the TCC characteristics of (Ba,Ca)(Ti,Zr)O 3 -based MLCCs from Y5V (−82%≦△C/C≦ + 22% from −30°C to 85°C) to X5R (−15%≦△C/C≦ + 15% from −55°C to 85°C). The high continuity (〉95%) of inner electrode and the fine grain size (0.56 μm) of BCTZ-based MLCCs with a non-core-shell structure can be attained by means of the rapid constrained sintering technique. The lifetime of the fine-grain-BCTZ-based MLCC fired by the novel sintering is superior to that of the coarse-grain-BCTZ-based MLCC fired by conventional sintering in a highly accelerated life test.
Print ISSN:
1546-542X
Electronic ISSN:
1744-7402
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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