| 1 | A novel friction stir diffusion bonding process using convex-vortex pin tools显示文摘In this work,a novel friction stir diffusion bonding(FSDB)method was proposed to eliminate hook when joining thin sheets.Three tools,with several convex-vortex pins were innovatively designed to improve the diffusion bonding effect of the lap interface.Results showed that sound joints,excellently bonded at the lap interface and without hook,were obtained.The lap interfaces on the joints welded using the T-tool and F-tool almost remained intact,thereby indicating that they were formed by diffusion bonding.The material flow behavior was also simulated by FLUENT software and the results showed that the material flow along thickness was significantly enhanced by increasing the pin number.The joint welded by the T-tool showed shear fracture mode.Sound bonding was formed at the lap interface when using the F-tool and thus the joint showed tensile fracture. | S.D.Ji Q.Wen Z.W.Li | 2020 | Journal of Materials Science & Technology2020，47，13： | 1 |
| 2 | REVISIT TO DIELECTRIC PROPERTIES OF FERRITE CERAMICS显示文摘Dielectric properties offerrite ceramics have been less reported than their magnetic properties.Ourrecent study indicated that ferrite ceramics with very low dielectric loss tangent can be developed byusing appropriate sintering aids,together with the optimization of other sintering parameters suchas sintering temperature and time duration.Among various candidates of sintering aids,Bi_(2)O_(3)isthe most promising one.It is important to find that the optimized concentration of sintering aid forfull densification is not sufficient to achieve lowest dielectric loss tangent.This short review was aimed to summarize the understanding in microstructural evolution,grain growth,densificationand dielectric properties offerrite ceramics as a function of sintering aid concentration and sinteringparameters,which could be used as a guidance to develop ferrite ceramics with low dielectric losstangents for various applications. | L.B.KONG L.LIU J.W.ZHAI Z.W.LI Z.H.YANG | 2012 | Journal of Advanced Dielectrics2012，2，3： | 0 |
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