当前位置: X-MOL 学术Compos. Part B Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Stable high thermal conductivities in BaTiO3 ceramic composites utilizing core-shell Ag@BaTiO3 particles
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-10-22 , DOI: 10.1016/j.compositesb.2020.108496
Gang Jian , Yong Jiao , Qingzhen Meng , Liang Feng , Zhongxian Yan , Chao Yan , Chen Zhang , Kyoung-Sik Moon , Ching-Ping Wong

Ceramic/metal composites have drawn much attention in heat dissipations due to excellent performances, however, issues rise with the uncontrollable architecture and unstable properties resulting from metal-particle fusions at the high-temperature sintering. This study reports a BaTiO3 (BT) composite at a high Ag loading of 60 vol% with a stable composite architecture achieved by utilizing core-shell Ag@BT particles. Conformal-coated Ag@BT particles are prepared by simultaneous hydrolysis. The BT shell is vital in keeping Ag particles separately distributed and the shape well-retained in the BT matrix before and after the sintering to exhibit controllable structures. A high thermal conductivity of 84 W/mK is obtained in the composite at 25 °C, 35-fold enhanced compared with that of the BT ceramic of 2.4 W/mK. Low thermal barrier resistances as well as the nonpercolative behavior attributing to high thermal conductivities are owing to the unique composite architecture. The composite exhibits small fractures at Ag-BT interfaces while no macro fractures across the material are observed after the thermal cycling test. This study presents a BT/Ag@BT composite for various heat dissipation applications.



中文翻译:

使用核壳型Ag @ BaTiO3颗粒的BaTiO3陶瓷复合材料具有稳定的高导热性

陶瓷/金属复合材料由于其优异的性能而在散热方面引起了很多关注,但是,由于不可控的结构以及在高温烧结时金属颗粒熔合导致的性能不稳定,出现了一些问题。这项研究报告了BaTiO 3通过使用核-壳型Ag @ BT颗粒实现60%的高Ag含量的高密度(BT)复合材料。通过同时水解制备保形涂层的Ag @ BT颗粒。BT壳对于保持Ag颗粒分开分布以及在烧结前后表现出可控结构的形状保持在BT基体中至关重要。在25°C下,复合材料的导热系数高达84 W / mK,与BT陶瓷的2.4 W / mK相比,导热系数提高了35倍。由于独特的复合结构,低热障电阻以及归因于高热导率的非渗透行为。在热循环测试后,复合材料在Ag-BT界面处显示出小裂缝,而在材料上未观察到宏观裂缝。

更新日期:2020-10-22
down
wechat
bug