The Research Of Tritium Penetration Barrier Prepared By Atmospheric Plasma Spraying And Centrifugal SHS

Nuclear fusion energy is recognized as the most clean and economical energy, with the potential for large-scale development and utilization. In the fusion reactor research field, packet tritium coating layer structure has been one of the key technologies of fusion reactor materials. This paper introduces several tritium coating and preparation technology. Coatings include Oxide, Aluminide, Silicide, Titanium compounds. Preparation technologies include Chemical Densification Coating technology (CDC), Magnetron Sputtering (RS),Hollow Cathode Discharge Ion Plating (HCD), Radio Frequency Sputtering(RFS), Chemical Vapor Deposition (CVD), Hot Dip Aluminizing (HDA), Ion Implantation, Vacuum Plasma Spray (VPS) and so on.The main research results are as follows:1. The coatings prepared by atmospheric plasma spraying include stable α-Al2O3, and metastabley-Al2O3. In spraying process, high temperature molten particle collises high-speedly, deformates matrix deposition layer coating, and contains defects such as voids, micro cracks and unmelted powder particles. The steel matrix, Ni/Al bond between Al2O3 layer and ceramic layer interface clear, with good mechanical bond strength.2. Improved Al2O3 coating has the least number of pores, and the highest hardness. The plasma sprayed Al2O3+50wt% SiC coating has the most number of pores, the lowest hardness and makes the bonding strength increased due to the existence of anchoring effect. The number of pores of Al+50wt% SiC coating and not improved Al2O3 coating process is in the middle. Their hardness is slightly lower than the former, bonding strength.3. The Al2O3 composite coating prepared by atmospheric plasma spraying on the 316L has the lowest rate of pores and the highest hardness. The coatings on the CNS-Ⅰ、CNS-Ⅱ、 45# steel and Al-6XN have the higher rate of pores and the lower hardness. The coating has the highest binding strength with CNS-Ⅰ、CNS-Ⅱ, lower binding strength with 45# steel, and the weakest binding strength with 316L and Al-6XN.4. The phase composition of the Ceramic Lined Composite Pipe prepared by Centrifugal SHS in Al+Fe2O3+SiO2 system is mainly α-Al2O3 with little Fe+2A12O4 hercynite phase. Additive SiO2 doesn’t change the main component.5. The ceramic layer and the steel layer of the Ceramic Lined Composite Pipe combine strongly through the iron transition layer. The dispersed iron, aluminum particles and micro holes distribute on the ceramic layer.6. The corroded morphology consists of α-Al2O3 dendrite and Fe+2Al2O4 metallic oxide located between dendrites.7. The pipe diameter and SiO2 additives will have an impact on performance. With the augmentation of the diameter, the micro hardness increases, the crushing strength increases, and the shear strength reduces. The radial compression load bearing capacity becomes bigger and bigger, may be due to the reduction of the porosity and the increase of the density. But the binding strength between the steel tube and the ceramic layer decreases, which leads to the decrease of the thermal shock times. As SiO2 increases to 8%, the porosity and the compressive strength decreases, the shear strength increases, however, the density, hardness and thermal shock resistance changes little.