Graphite emulsion with excellent dispersion stability and rheological property for drawing ultrafine tungsten wire
The development of silicon wafers in the photovoltaic industry towards larger and thinner sizes requires ultrafine tungsten wires, and the uniform coating of high-performance graphite emulsion is the key to ensuring the quality of tungsten wires. However, existing graphite emulsion mainly depends on...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425013389 |
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| Summary: | The development of silicon wafers in the photovoltaic industry towards larger and thinner sizes requires ultrafine tungsten wires, and the uniform coating of high-performance graphite emulsion is the key to ensuring the quality of tungsten wires. However, existing graphite emulsion mainly depends on imports, and the limited domestic self-made graphite emulsion shows poor dispersion stability and nonuniform surface coating. This study provides a novel graphite emulsion with excellent dispersion stability and rheological property by introducing carboxymethyl cellulose (CMC). The graphite emulsion with 1.0 % CMC addition has the best dispersion stability, moderate viscosity, and excellent rheological properties. The steric hindrance effect produced by CMC polymer improves the dispersion stability, while the bridges and entanglements of CMC chains regulate the viscosity to ensure uniform coating. The resulted drawn tungsten wire exhibits a large free circle diameter and good surface quality. This work provides a theoretical basis for the preparation of high-performance emulsion and improving the quality of metal wire drawing. |
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| ISSN: | 2238-7854 |