Joining Mechanism Of Field-assisted Diffusion Bonding Solid Electrolytes Ceramics And Glass To Metals

In this dissertation, it has been investigated that microstructure of joint and phases of the transitional area have been analyzed by means of SEM,TEM,EDAX and XRD, and it has been analyzed that the physical and chemical natural and technological properties of field-assisted diffusion bonding ceramics and glass to metals and composite by means of conceptions of electrostatics ,thermodynamics and electrochemistry.It is shown that the bonding process of ceramic and glass to metals can be dissociated three partitions: electrostatics interface attraction, anodic oxidize and solid phases diffusion reaction; that temperature, voltage ion conductivity of the ceramics and the surface roughness are important factors influencing the joining ratio and quality. The joining area is composed of ceramic (glass) ,transitional area and metal, and the microstructures of the transitional area and interface regions are influencing factors on the joining strength. The pillar crystals that parallels to electrical field are benefit of the joining strength.The junction interface regions of transitional area to ceramic and metal are weak points of joint, and the joining strength is restricted by the glass phases of the regions.It is also shown that the non-crystal SiO₂ as an active deposit film can strengthen the electrostatics of interface and increase ions diffusion rate, which can improve bondability of the field-assisted diffusion bonding ceramics to metals.It is possible to bonding SiCp/A1 composite to metal by means of fielded-assisted diffusion bonding, and the junction problems in the interface...