전기선폭발법으로 제조된 텅스텐 분말의 산소 조성이 방전플라즈마소결 거동에 미치는 영향
Effect of Oxygen Content in the Tungsten Powder Fabricated by Electrical Explosion of Wire Method on the Behavior of Spark-Plasma Sintering
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Effect of oxygen content in the ultrafine tungsten powder fabricated by electrical explosion of wire methodon the behvior of spark plasma sintering was investigated. The initial oxygen content of 6.5 wt% of as-fabricated tungstenpowder was reduced to 2.3 and 0.7 wt% for the powders which were reduction-treated at 400oC for 2 hour and at500oC for 1h in hydrogen atmosphere, respectively. The reduction-treated tungsten powders were spark-plasma sinteredat 1200-1600oC for 100-3600 sec. with applied pressure of 50 MPa under vacuum of 0.133 Pa. Maximun sindered densityof 97% relative density was obtained under the condition of 1600oC for 1h from the tungsten powder with 0.7 wt%oxygen. Sintering activation energy of 95.85 kJ/mol−1 was obtained, which is remarkably smaller than the reported onesof 380~460 kJ/mol−1 for pressureless sintering of micron-scale tungsten powders.
Abstract
Effect of oxygen content in the ultrafine tungsten powder fabricated by electrical explosion of wire methodon the behvior of spark plasma sintering was investigated. The initial oxygen content of 6.5 wt% of as-fabricated tungstenpowder was reduced to 2.3 and 0.7 wt% for the powders which were reduction-treated at 400oC for 2 hour and at500oC for 1h in hydrogen atmosphere, respectively. The reduction-treated tungsten powders were spark-plasma sinteredat 1200-1600oC for 100-3600 sec. with applied pressure of 50 MPa under vacuum of 0.133 Pa. Maximun sindered densityof 97% relative density was obtained under the condition of 1600oC for 1h from the tungsten powder with 0.7 wt%oxygen. Sintering activation energy of 95.85 kJ/mol−1 was obtained, which is remarkably smaller than the reported onesof 380~460 kJ/mol−1 for pressureless sintering of micron-scale tungsten powders.
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