Study on solvent-thermal two-step degreasing process of tungsten-based alloy rods by plasticizing extrusion molding
Long Lu-ping
2012
Citations
0
Citations
Journal
Materials Science and Technology
Semantic Scholar
Key Takeaway Key Takeaway: The solvent-thermal two-step degreasing process effectively achieves fast and defect-free degreasing of 24 mm tungsten-based alloy rods by plasticizing extrusion molding.
Abstract
The keys of preparation of large aspect ratio tungsten-based alloy rods are forming,degreasing and subsequent sintering control.According to the research of powder extrusion molding(PEM),the fast and defect-free degreasing of Ф24 mm tungsten-based alloy rods,made by two-step degreasing process including solvent and thermal stages,were mainly investigated in this paper.The results showed that,the binder removal ratio was about 45 wt.% of Ф24 mm tungsten-based alloy rods when the solvent degreasing temperature was 45 ℃ and the holding time was 12 h.The binder removal ratio was above 70 wt.% by increasing the drying stage during solvent degreasing.The green maintained good shape during subsequent thermal degreasing in a vacuum atmosphere,and the binder removal completed within 12 h.The solvent-thermal two-step degreasing process could achieve a fast and defect-free degreasing of Ф24 mm tungsten-based alloy rods extruded.