研究目的
Improving the properties of Ag/SnO2 contact materials by doping with different proportions of rare earth Ce to enhance conductivity and reduce hardness.
研究成果
The study concludes that doping Ag/SnO2 contact materials with a Ce ratio of 0.125 results in the highest electron mobility, best conductivity, decreased hardness, and the smallest universal elastic anisotropy index. The simulation and experimental results are well matched, providing a method to improve the electrical properties of Ag/SnO2 contact materials.
研究不足
The study is limited to the doping of rare earth Ce in Ag/SnO2 contact materials and does not explore other dopants or combinations. The experimental conditions are specific (24 V, 13 A, and contact pressure of 86 cN), which may not cover all practical applications.
1：Experimental Design and Method Selection:
Based on the first principle of density functional theory, different proportions of rare earth Ce were doped into SnO
2：The study included geometric optimization, energy band, density of states, and elastic constant calculations. Sample Selection and Data Sources:
SnO2 powders with different doping ratios were prepared by the sol-gel method, and Ag/SnO2 contacts with different doping proportions were prepared by powder metallurgy.
3：List of Experimental Equipment and Materials:
Materials Studio software with the CASTEP module, JF04C electrical contact material tester, HXD-1000TM digital microhardness tester, and scanning electron microscopy (SEM).
4：Experimental Procedures and Operational Workflow:
The electrical contact properties were tested under load 24 V, 13 A, and contact pressure was 86 cN for the on-off period of
5：4 seconds. Data Analysis Methods:
The conductivity was evaluated by the contact resistance and the arcing energy. The hardness was measured, and SEM was used to observe the arc ablation morphology.
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