Study On High Temperature Oxidation Behavior Of Silicon Molybdenum Rods

 

 

This paper presents a comprehensive study on the oxidation behavior of silicon-molybdenum rods (SiMo) at high temperatures. This study aimed to study the oxidation process, analyze the mechanisms behind the oxidation behavior, and provide insights into the development of SiMo protective coatings.

Introduction: Silicon molybdenum (SiMo) is a refractory material with high melting point, high temperature resistance and excellent oxidation resistance.

 

Due to its unique physical and chemical properties, it is widely used in high-tech fields such as aerospace and atomic energy. However, the oxidation of SiMo under high temperature conditions can significantly affect its mechanical and physical properties, leading to serious safety issues.

 

Therefore, studying the oxidation behavior of SiMo is of great significance for improving its performance and expanding its application range.

 

Experimental method: This study uses pure silicon molybdenum rods as samples. The samples were cut into uniform lengths and polished. The oxidation behavior of the samples was studied in a high-temperature furnace in the temperature range from 600°C to 1000°C. The furnace is continuously purged with pure argon to maintain an inert atmosphere. The weight gain of the sample was recorded using a sensitive balance system connected to a computer, and the surface morphology of the sample was observed using a scanning electron microscope (SEM).

 

Experimental results: The weight gain of SiMo samples gradually increases as the temperature increases. At 600°C, weight gain is relatively low, but increases rapidly above 800°C. SEM images show that as the temperature increases, the surface of the SiMo sample becomes rougher, and small pores and cracks are observed at high temperatures.

 

Experimental analysis: The high-temperature oxidation of SiMo is a complex process involving many factors, including temperature, humidity, oxygen concentration, surface morphology, etc. In this study, the oxidation behavior of SiMo was mainly affected by temperature and oxygen concentration.

 

At low temperatures, the oxidation rate is relatively slow, but above 800°C, the oxidation rate accelerates rapidly due to the activation of surface atoms and the easier diffusion of oxygen atoms through the surface oxide layer.

 

In addition, the surface morphology of SiMo also plays a crucial role in its oxidation behavior. A rough surface with more defects and irregularities can provide more nucleation sites for oxide growth, resulting in faster oxidation rates.

 

Conclusion: This study shows that the oxidation behavior of SiMo is strongly dependent on temperature and surface morphology. At low temperatures, the oxidation rate is relatively slow, but above 800°C it increases rapidly due to surface activation and easier diffusion of oxygen through the oxide layer. Surface roughness and defects can also accelerate oxidation rates by providing more nucleation sites for oxide growth. These findings provide valuable information for understanding the oxidation behavior of SiMo and developing protective coatings to improve its performance in use.