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Achieving high-strength porous tungsten with wide porosity range via selective dissolution W-Ti-Fe precursor
Ist Teil von
International journal of refractory metals & hard materials, 2024-06, Vol.121, Article 106685
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2024
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Porous tungsten with wide porosity variation is considered a candidate for high-energy X-ray flash radiography. This work combines tape casting and dealloying to selectively dissolve a W-Ti-Fe precursor, achieving high-strength porous tungsten with a wide porosity range. The PVB exists on the surface of particles in the form of an amorphous carbon film after pyrolysis, providing conditions for the W-Fe-C interface reaction. The porosity of porous tungsten is 50.7–80.4%. The compressive strengths of porous tungsten with porosity of 50.7% and 80.4% are 221.9 MPa and 10.6 MPa, respectively. The dissolution of the Ti located in the ligament can enhance the porosity of porous tungsten. The coating composed of the solid solution formed at the interface of W and Ti during heat treatment and Fe3W3C can enhance the ligament strength. This work provides a theoretical reference for preparing porous tungsten with a wide porosity range and high performance.
•Porous tungsten is prepared by combining tape casting with dealloying.•Porous tungsten exhibits high strength within a wide range of porosity.•Fe3W3C lays a mechanical foundation for the sequential dealloying of Fe and Ti.•The coating composed of WTi solid solution and Fe3W3C improves the mechanical properties of porous tungsten.