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Effect of the number of operations on the arc erosion image of Ag/Ni(10) electrical contacts

Arc energy
Figure 2-1 shows the arc energy probability of Ag/Ni(10) electrical contact materials prepared by SE process at different operation times. The results show that the arc energy probability of Ag/Ni(10) SE contact material has two distributions, among which the arc energy distribution of 5000 and 30,000 times has 99% similarity; the arc energy distribution of 1000, 3000, 10,000 and 20,000 times has 80% similarity, and its arc energy is lower than that of 5000 and 30,000 times. And 40,000 times the arc energy ratio than the other times are greater. Under different operation times, the average arc energy is ranked from small to large: N1000 (373.5mJ) <N3000 (383.1mJ) <N10000 (390.7mJ) <N20000 ( 405.8n J) <N30000 (615.2mJ) <N5000
(623.9mJ)<N40,000(711.3mJ). The average value of arc energy increases with the number of operations, except for 5000 operations.
The average value of arc energy increases with the number of operations.

arc time probability of electric contact material under different operation times. The results show that the arc time probability distribution of 5000 and 30,000 times has 99% similarity; the arc time probability distribution of 1000, 3000, 10,000 and 20,000 times has 95% similarity, and its arc time value is lower than 5000 and 30,000 times, while the arc time of 40,000 times is larger than all other times. The average values of arc time for different number of operations are ranked from smallest to largest as:N1000(4.615ms)<N20000(4.707ms)<N3000(4.757ms)<N100(4.866ms)<N30000(7.318ms)<N5000(7.644ms)<N40000(8.981ms ). Comparing Fig. 2-1 and Fig. 2-2, it can be seen that the arc time probability distribution of Ag/Ni(10)SE electrical contact material is basically similar to the arc energy probability distribution for different number of operations.

Figure 2-3 shows the melt force of Ag/Ni(10) electrical contact material prepared by SE process at different number of operations.
The probability diagram of the fusion welding force probability of AgNi(10)SE. The results show that 95% of the fusion welding force of Ag/Ni(10)SE electrocontacts is less than 25×10-²N at different operation times, and the probability distribution curves are similar and the values are not significantly different. The average values of the fusion welding force for different number of operations were ranked from small to large: N5000 (2.888×10-²N) < N1000 (2.975×10-²N) < N3000 (4.503×10-²N) < N10000 (4.892×10-2N) < N40000 (4. 975×10-²N) < N20000 (5. 867×10-²N)<N30,000(11.81×10-²N). There is basically no pattern in the variation of the welding force and the number of operations.

Figure 2-4 shows the mass variation of Ag/Ni(10) electrical contact material prepared by the SE process at different numbers of operations. The results show that the mass of the cathode electrical contacts increased and the mass of the anode electrical contacts decreased at different operation times, and the total mass of both cathode and anode electrical contacts decreased. With the increase of operation times (except 40,000 times), the change of cathode and anode electric contact mass gradually increased. Arc operation 30,000 times when the anode and cathode contact mass change the most:Arc operation 40,000 times when the total mass of contacts change the most. The cathode contact mass increased and the anode contact mass decreased, indicating that the material transfer from the anode to the cathode occurred during the arc erosion process of Ag/Ni(10)SE electrical contact material.

The increase in mass change on the electrical contacts with the increase in the number of operations indicates that the arc erosion of the Ag/Ni(10)SE electrical contact material becomes more and more severe with the increase in the number of operations. At the same number of operations, the change in mass on the anode is greater than that on the cathode, indicating that the arc erosion on the anode electrical contacts is more severe than that on the cathode electrical contacts.

Figure 2-5 shows the three-dimensional macroscopic erosion morphology of Ag/Ni(10) electrical contacts prepared by SE process under different operation times (1000 times 3000, 5000, 10000, 20000, 30000 and 40000 times) for both cathode and anode electrical contacts. It can be seen from Figs. 2-5 that the surface morphology of Ag/Ni(10)SE electrical contact material changed greatly under the arc operation, with a small bump on the surface of the cathode electrical contact and an erosion pit corresponding to the small bump on the surface of the anode electrical contact. As the number of operations increased, the height and width of the bump on the surface of the cathode electrical contact increased, and the depth and area of the erosion pits on the surface of the anode electrical contact also increased. With the increase in the number of operations, the morphology of the electrical contact surface changes more and more, and the area of the arc acting on the surface of the cathode and anode electrical contacts also increases, indicating that the arc erosion of the electrical contact material surface becomes more and more serious with the increase in the number of operations. The small bump on the cathode surface and the erosion pits on the anode surface indicate that the material transfer from the anode to the cathode occurred during the arc erosion of Ag/Ni(10)SE electrical contact material. During the arc erosion process, the mass of the anode electrical contact decreased and the mass of the cathode electrical contact increased because the material on the anode was transferred to the cathode, and this result was consistent with the previous results of the arc erosion rate. In the same number of operations, the surface morphology of the anode electrical contacts changed more than that of the cathode electrical contacts, indicating that the surface arc erosion of the anode electrical contacts was more serious than that of the cathode electrical contacts.

The two-dimensional macroscopic erosion morphology of the anodic electrical contacts prepared by the SE process at different numbers of operations. It can be seen from Figures 2-6 that the surface morphology of the Ag/Ni(10) SE electrical contact material changed under arc operation. Round erosion spots appeared on both cathode and anode surfaces, and the diameter of the spots increased with the increase of operation times, indicating that the arc erosion increased with the increase of operation times. At the same number of operations, the surface morphology of the anode contact changed more than that of the cathode, indicating that the arc erosion on the surface of the anode electrical contact was more serious than that of the cathode electrical contact.

Figure 2-7 shows the cross-sectional metallographic microstructures of Ag/Ni(10) electrical contacts prepared by the SE process at different operation times (1000, 3000, 5000, 10,000, 20,000, 30,000 and 4000 times) for both cathodic and anodic electrical contacts.

As can be seen from Figure 2-7, the cross-sectional organization and shape of the Ag/Ni(10)SE electrical contact material changed considerably under the arc operation. Small convex peaks due to material transfer appeared on the cathode electrical contact cross-section (see box in Figure 2-7), while small pits appeared on the anode contact cross-section accordingly (see circles in Figure 2-7).

As the number of operations increased, the area of arcing action on the cathode and anode electrical contact cross-sections also gradually increased and some remnants due to spatter erosion were observed (see white arrows in Figure 2-7).

As the number of operations increased, the area and depth of the small bumps on the cathode and the erosion pits on the anode increased, indicating that the arc erosion on the cathode electrical contacts and the anode electrical contacts became more and more severe as the number of operations increased.

At the same number of operations, the cross-sectional organization change on the anode electrical contacts was more severe than that on the cathode electrical contacts, indicating that the arc erosion on the anode electrical contacts was more severe than that on the cathode electrical contacts.

Author

Hello, my name is Eva Xia, and I am currently the Marketing Manager at Yueqing Weup Technology Co., Ltd, located in Wenzhou, Zhejiang, China. With over a decade of experience in the accounting field, I have developed extensive knowledge and skills that enable me to excel in my role. Additionally, I have spent two years working as an English teacher, which enhanced my communication abilities and instilled discipline within me.

Having gained more than three years of valuable experience in overseas sales, I have had the opportunity to expand my horizons and develop a deeper understanding of the commercial landscape. This exposure has nurtured my business understanding and allowed me to navigate diverse markets confidently.

However, despite my accomplishments thus far, I remain dedicated to continuous growth and learning. My current area of focus revolves around electronic switches. It is a fascinating and dynamic field that constantly evolves with technological advancements. By delving deeper into this realm, I aim to enhance my professional knowledge and stay ahead of industry trends.

In summary, as a Marketing Manager at Yueqing Weup Technology Co., Ltd., I bring forth a wealth of experience in accounting coupled with the valuable skills honed during my time as an English teacher. Furthermore, my extensive overseas sales expertise has sharpened my business acumen. With a relentless thirst for knowledge and a specific interest in electronic switches, I strive to enhance my professional capabilities further while contributing positively to our organization’s success.

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Eva Xia,
Marketing Manager at Yueqing Weup Technology Co., Ltd

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