Advances in Material Science

In this paper, the determination method of the atomic ratio of oxygen to uranium in UO2-MO pellets was studied. Through the experiments of UO2-MO pellets with different composition ratios, the results showed that MO in UO2-MO pellets was a stable compound and did not participate in the thermogravimetric reaction. Only uranium dioxide was oxidized into stable uranium trioxide in oxygen. By accurately measuring the net weight of samples after dehydration and the total weight after oxidation, the formula for calculating the oxygen-uranium ratio of UO2-MO pellets is derived by formula derivation, and the RSD of this method is better than 0.13%.

The uranium content detection method of UO2-BeO pellets was studied. The sample was dissolved in phosphoric acid, and then heated to be completely dissolved at 200℃ by adding 3 drops of nitric acid. In concentrated phosphoric acid solution containing sulfamic acid, excess ferrous sulfate was used to reduce uranium (vi) to uranium (vi), the rest ferrous sulfate was oxidized by nitric acid using molybdenum (vi) as catalyst, vanadyl sulfate was added, and uranium was titrated by potassium dichromate standard solution. The precision of the method is better than 0.1%

Physical and Chemical Testing Center of North Nuclear Fuel Components Co., Ltd., Baotou, Inner Mongolia, 014035, China The determination process of hydride orientation factor of zirconium alloy mainly includes hydrogen permeation process and hydride display process. The key of hydride orientation factor measurement lies in controllable and effective hydrogen permeation and true and clear display of hydride. When a metallographic picture with appropriate number of hydride and clear display is obtained, the hydride orientation factor of sample can be accurately and quickly measured. By analyzing and testing the possible factors affecting the hydrogen permeation effect of zirconium alloy tube, the corrosion parameters such as temperature, pressure, type, concentration and holding time of corrosion solution were determined.

Grasping the accuracy of the electromechanical servo torque test system has always been an active research issue in the product manufacturing industry. Research on static traceability and dynamic traceability of electromechanical servo torque testing system can better realize the analysis of influencing factors in its use process and improve the reliability and effectiveness of its system use. At the same time, the uncertainty evaluation of the system combined with the influencing factors can fully realize the data analysis and demonstration of the electromechanical servo torque test system, and provide a strong guarantee for the authenticity of the product test data.

This paper studies the difference in heat transfer and adhesion performance of glass fiber substrate thermal conductive double-sided adhesive, PVC substrate double-sided adhesive, and PET substrate double-sided adhesive to thermal conductive materials and polymer materials in photovoltaic and thermal integrated modules. Studies have shown that the use of glass fiber-based thermally conductive double-sided adhesive to bond polymer materials and thermally conductive materials can achieve the normal use of PVT modules under weather-resistant conditions. Research has shown that glass fiber-based thermally conductive double-sided adhesive has better adhesion than other materials., Initial viscosity, static shear force, thermal conductivity, etc., can realize the normal use of PVT modules under weathering conditions.