STS304 및 알루미나 브레이징용접 접합부의 접합강도 변화에 관한 연구

A Study on the Change in the Bonding Strength of STS304 and Alumina Brazing Weld Joint

Ceramic is excellent in heat resistance, and has a very low thermal conductivity and electrical conductivity in the physical properties. However there exists restrictions for a wide range of applications due to brittleness of atomic bonding structure. Studies related to the bonding between ceramic and the non-ferrous metal are being conducted in order to utilize the excellent electrical conductivity and high strength of the ceramic. Among them, there is a brazing bonding method using a filler metal. As the method does not require a high precision of the junction surface, its process is relatively simple. This is why it is much used to bond the structural material. In this study, the ion beam was used to increase the strength of brazing joint between the non-ferrous metal and ceramic. The quality of the surface was improved by submerging Ti which is an active metal with ion beam on the surface of a ceramic and the base material. High bonding strength can be obtained by forming steadily a surface reaction product such as TiO and Ti2O3 on the joint of Al2O3, which is oxide-based ceramic, and STS304. If the thickness of Ti is changed, the more increases the thickness of Ti, the more increases the bonding strength along the bonding time. As the brazing bonding temperature turns higher, the thickness of the residual charge metal, which is formed between STS304 and Ti2O3 ceramic, decreased. By contrast, the thickness of the layer of the reaction product, which is on the surface of ceramic, was found to be increased.