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Published on: November 11, 2013
Numerical Simulation and Experimental Analysis for Microwave Sintering Process of Lithium Hydride (LiH)
Yuanjia Lu1,2, Maobing Shuai3, Jiyun Gao4
1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Microwave sintering rapidly densifies lithium hydride (LiH) for neutron shielding. This method ensures uniform heating and enhances grain bonding, overcoming cracking issues in traditional sintering.
Area of Science:
- Materials Science
- Nuclear Engineering
- Applied Physics
Background:
- Lithium hydride (LiH) is crucial for neutron shielding in reactors and spacecraft.
- Conventional sintering methods frequently cause cracking in LiH components.
- Advanced sintering techniques are needed to improve LiH densification.
Purpose of the Study:
- To investigate the microwave sintering of lithium hydride (LiH).
- To analyze the electromagnetic and thermal fields during microwave heating of LiH.
- To evaluate the effectiveness of microwave sintering for producing dense LiH.
Main Methods:
- Established a multiphysics model using measured dielectric properties of LiH.
- Simulated microwave heating of cylindrical LiH samples.
- Analyzed electric field distribution and temperature profiles.
Main Results:
- Achieved sintering temperature (520 °C) in 415 s with uniform heating (ΔT < 5 °C).
- Observed uniform electric field distribution and concentrated resistive losses.
- Enhanced interface migration and dense metallurgical bonding between LiH grains.
Conclusions:
- Microwave sintering offers rapid densification of LiH materials.
- The technology provides excellent uniform heating characteristics.
- This method shows significant potential for improving LiH material properties for neutron shielding applications.
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