Study of oxygen and steam interactions with rgt graphite

Corrosion in air and water remains a problem for graphite as an important structural material of nuclear reactors. Changes in the gas composition in corrosion chamber with samples of RGT graphite have been studied. The sample was linearly heated to 1100C with 10C /min rate, and held at this temperature for 1800 s. Then the sample was cooled down within the same rate. During the experiment changes in the gas composition in the chamber were registered within the mass range 1-70. The time and temperature dependencies of steam, oxygen and gaseous corrosion products of RGT graphite have been obtained. Arrhenius dependencies and activation energy of rate constants of graphite interaction with the following products were derived: oxygen-graphite (mole/(sm2Pa)),water-graphite (mole/(sm2Pa)

Lithium CPS based on carboxylic fabric with CNT synthesized on its fibers’ surface

Abstract The paper describes a technique of CNT synthesis on the fibers of carboxylic fabric. It consists of three operational stages: creation of the experimental facility based on high-temperature quartz flow reactor; validation of synthesis modes of CNT homogeneous layers, and CNT synthesis on the fibers of carboxylic fabric. An overview of the technology of lithium CPS production based on CNT-reinforced carboxylic fabric is given. It includes a development of experimental device for lithium CPS production, development and definition of technological procedures for CPS matrix filling with liquid lithium and manufacturing of prototype lithium CPS sample on basis of CNT-reinforced carboxylic fabric

“Isotope effect” of hydrogen and deuterium interaction with vanadium alloys VCrTi

Abstract V-Ti-Cr vanadium alloys have many perspective applications, particularly, they are considered as a main structural material of the first wall and blanket of fusion reactor with lithium coolant. Also, they are used as a high-temperature membrane for hydrogen isotopes separation and effective sorbents for hydrogen purification installations by PSA (Pressure Swing Adsorption) adsorption method (under the control of sorbent surface composition). The use of vanadium alloys can be extremely interesting because of the possibility of hydrogen isotopes separation in hydrogen systems. The fact is that vanadium has unique properties with respect to hydrogen: protium atoms typically occupy octahedral interstices in vanadium bcc lattice, while the deuterium atoms - mainly tetrahedral interstices. That all considerably affects diffusion and solubility of hydrogen isotopes in vanadium. This paper presents the results of experiments on sorption of hydrogen isotopes with V4Cr4Ti vanadium alloy from a mixture of hydrogen isotopes. According to the obtained time dependence of hydrogen isotopes partial pressure change in gas mixture the following parameters were determined: rate of dissolution and heat of dissolution of hydrogen and deuterium in vanadium alloys V4Cr4Ti, V10Cr5Ti. The conclusion about the prospects of using vanadium alloys in storage systems, separation and purification was made