Preparation method of molybdenum disilicide series oxygen diffusion coefficient verifying diaphragm, and method used for calculating film oxygen diffusion coefficient

Abstract

The invention provides a preparation method of a molybdenum disilicide series oxygen diffusion coefficient verifying diaphragm, and method used for calculating film oxygen diffusion coefficient. The preparation method comprises following steps: SiO2 base solution preparation, oxidation corrosion resistant doped solution preparation, mixing of a working mother liquor B into a working mother liquor A at different ratios, silicon chip washing, silicon chip doping film preparation, and baking of generated amorphous film in a high temperature tubular furnace. The preparation method is capable of prolonging the service life of MoSi2 heating elements, increasing using temperature, and realizing accurate verifying of oxygen diffusion coefficient, so that the industrial value is high, and the application prospect is promising; and at the same time, the method used for calculating film oxygen diffusion coefficient is simple, convenient, and accurate, and possesses significant meaning in study on high temperature corrosion mechanisms.

Description

technical field [0001] The invention relates to the calculation and verification of the oxygen diffusion coefficient under high temperature oxidation corrosion conditions, in particular to a method for preparing a film for verifying the oxygen diffusion coefficient of a molybdenum disilicide series material and a method for calculating the oxygen diffusion coefficient in the film. Background technique [0002] Molybdenum disilicide (MoSi 2 ) series material is an intermetallic material with a high melting point and a density of 6.24g / m 3 , the highest melting point is 2303°C, and the coefficient of thermal expansion is 8.25*10 -6 K -1 , in addition to being widely used as a high-temperature heating element, it can also be used as a high-temperature alloy coating material, which has important industrial value. [0003] High temperature oxidation corrosion of silicon-based materials is the root cause of material degradation, MoSi 2 When the material is used in high tempera...

AI Technical Summary

Problems solved by technology

It is reported in the literature that the activation energy of oxygen diffusion is 200-900KJ / mol. If the steady-state diffusion mode is used, the diffusion mode coefficient of the gas should be constant. Using this method, the mathematical relationship between the oxygen diffusion coefficient and the thickness of the oxide layer can be established, which does not match the actual situation.

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