| 引用本文: | 刘文胜,蔡青山,马运柱,龙路平.增塑挤压成形钨基合金棒材溶剂-热二步脱脂工艺研究[J].材料科学与工艺,2012,20(4):7-12.DOI:10.11951/j.issn.1005-0299.20120402. |
| LIU Wen-sheng,CAI Qing-shan,MA Yun-zhu,LONG Lu-ping.Study on solvent-thermal two-step degreasing process of tungsten-based alloy rods by plasticizing extrusion molding[J].Materials Science and Technology,2012,20(4):7-12.DOI:10.11951/j.issn.1005-0299.20120402. |
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| 摘要: |
| 大长径比钨基合金棒材制备的关键是成形、脱脂和后续的烧结控制.基于增塑挤压成形的研究,对Ф24 mm钨基合金挤压棒坯的快速无缺陷脱脂,即溶剂-热二步脱脂工艺进行了研究.结果表明:在溶剂脱脂温度为45 ℃,脱脂12 h后,Ф24 mm钨基合金棒材一次脱脂率达45%;在溶剂脱指过程中增加干燥阶段,脱脂率可达70%以上;在真空气氛下对脱脂棒材进行后续热脱脂,坯体保形性好,且在12 h内,脱脂可以全部完成.采用溶剂-热二步脱脂工艺可以实现Ф24 mm钨基合金挤压棒材的快速无缺陷脱脂. |
| 关键词: 钨基合金 粉末挤压成形 挤压棒材 溶剂-热二步脱脂工艺 |
| DOI：10.11951/j.issn.1005-0299.20120402 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(50774098). |
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| Study on solvent-thermal two-step degreasing process of tungsten-based alloy rods by plasticizing extrusion molding |
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LIU Wen-sheng, CAI Qing-shan, MA Yun-zhu, LONG Lu-ping
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State Key Laboratory for Powder Metallurgy,Central South University,Changsha 410083,China
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| 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. |
| Key words: tungsten-based alloy PEM extruded rods solvent-thermal two-step degreasing process |
