Multi-functional phase for precision sampling resistors for HVDC voltage transformer and efficient microwave absorption

Precision resistor performance has a direct impact on the detection accuracy of DC voltage transformers since it is a crucial component for signal sampling in high-voltage DC (HVDC) voltage transformers. The accuracy of the resistance is directly related to the performance of the slurry, which is sintered to produce the resistance. In this article, two different kinds of conductive fillers carbon-based and metal-based were created using the hydrothermal technique and high-temperature carbonization, and the matching resistance slurry and thick film resistors were made by compounding glass powder and organic carriers. The findings demonstrate the resistance slurry prepared using copper nanopowder as a conductive filler can achieve lower square resistance values and can be adjusted within the range of 124 Ω/□ -1503 Ω/□ by changing the solid content, and the square resistance is less affected by temperature. It can be used as a precision resistor for preparing high-voltage DC voltage transformers. Furthermore, the prepared functional phase materials also exhibit satisfying microwave absorption performance. Typically, the copper nanopowder exhibits the RLmin of -23.77 dB and the EABmax of 4.64 GHz at 1.8 mm. This work provides a reference for the application of functional phases in electronic slurry and microwave absorption fields.