Blog

Molybdenum (Mo) plates are widely used in various industrial applications due to their unique properties such as high hardness, high thermal conductivity, and high melting point. However, during the rolling process of molybdenum plate blanks, a common challenge faced by manufacturers is the lamination issue in thin plates. This article will discuss the causes of lamination in molybdenum plates and propose improvement measures to address this issue.

I. Causes of Lamination in Molybdenum Plates

1. Impurities in Material Composition
   • The presence of impurities such as sulfur, phosphorus, and chromium in the steel composition can significantly affect the quality of the molybdenum plates. These impurities, especially in high concentrations, can lead to lamination defects during the rolling process.
   • Chromium content, for instance, can affect the heating uniformity of the plate, resulting in lamination defects.
2. Rolling Process Variables
   • The control of rolling temperature and the condition of the rolling mill are crucial factors influencing the quality of the molybdenum plates.
   • Excessively low rolling temperatures or uneven temperature distribution can cause lamination in the molybdenum plates.
   • The state of the rolling mill, including the wear degree of the rolls, roll pass design, and control of the pressing force, also plays a significant role in the quality of the plates.
3. Manufacturing Equipment
   • The quality of the molybdenum plates is also influenced by the manufacturing equipment, including the heating furnace, rolling mill, and cooler.
   • Problems such as out of control heating in the furnace or uneven temperature distribution, as well as insufficient pressing force in the rolling mill, can easily lead to lamination defects.
4. Processing Factors
   • During the rolling process, factors such as the original head shape of the billet, billet width, processing rate, and number of passes can also contribute to lamination and peeling issues.
   • Uneven deformation during rolling can cause the surface metal to flow faster than the internal metal, resulting in tensile stresses in the thickness direction and leading to lamination.

II. Improvement Measures

1. Control Material Composition
   • To prevent lamination, it is essential to control the chemical composition of the steel, particularly the levels of sulfur, phosphorus, and chromium.
   • Ensuring a more uniform composition of the steel can significantly reduce the occurrence of lamination defects.
2. Optimize Rolling Process
   • Proper control of rolling temperatures and the condition of the rolling mill are crucial.
   • Regular maintenance and inspections of the rolling mill should be conducted to ensure optimal performance.
   • Adjusting the rolling process parameters, such as the rolling temperature and pressing force, can help minimize lamination.
3. Upgrade Manufacturing Equipment
   • The selection and design of manufacturing equipment should prioritize stability and reliability.
   • Advanced equipment with better temperature control and rolling precision can reduce the likelihood of lamination defects.
4. Enhance Employee Training
   • Improving the quality and safety awareness of production employees through training and communication is vital.
   • Employees should be well-versed in the proper operation and maintenance of rolling equipment to minimize errors during the production process.
5. Adopt Advanced Processing Techniques
   • Utilizing advanced processing techniques, such as ultrasonic vibration cutting and laser cutting, can improve the processing efficiency and accuracy of molybdenum, while reducing damage to the workpiece.

III. Conclusion

The lamination issue in molybdenum plates during the rolling process is a significant challenge that requires attention. By addressing the causes of lamination, such as impurities in material composition, rolling process variables, manufacturing equipment issues, and processing factors, and implementing improvement measures such as controlling material composition, optimizing the rolling process, upgrading manufacturing equipment, enhancing employee training, and adopting advanced processing techniques, manufacturers can significantly reduce the occurrence of lamination defects and improve the quality of molybdenum plates.

Addressing these challenges will not only enhance the performance and reliability of molybdenum plates but also contribute to the overall advancement and efficiency of the manufacturing industry.