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首页> 外文会议>Powder metallurgy world congress amp; exhibition >Comparison of Extruded Powder Metallurgy Rhenium and Hot Isostatic Pressed Rhenium
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Comparison of Extruded Powder Metallurgy Rhenium and Hot Isostatic Pressed Rhenium

机译：粉末冶金R和热等静压hen的比较

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摘要

Rhenium is a refractory metal, but unlike other refractory metals (W, Mo, Nb, and Ta), it does not form a carbide and the crystal structure is not body-centered cubic. Rhenium has a hexagonal closed-packed crystal structure with c/a ratio of 1.615. It has a melting point of 3180 °C (second highest only to tungsten) and the third highest density of all metals at 21.04 g/cm~3. Rhenium is extremely stiff with an elastic modulus of 420 GPa (more than twice that of steel) [1]. Rhenium is immune to thermal shock and has no ductile brittle transition temperature. This material is extremely difficult to process due to a work-hardening coefficient greater than 0.5 (higher than copper) [2] and rhenium oxidizes (sublimates) in air at around 400°C [3]. Because of the high melting temperature and oxidation issues, rhenium is manufactured via powder metallurgy for large scale production; however, extremely high temperature are required for sintering and hot isostatic pressing to consolidate to sufficient density for subsequent deformation processing.
机译：hen是一种难熔金属，但与其他难熔金属（W，Mo，Nb和Ta）不同，它不会形成碳化物，并且晶体结构也不是体心立方。 hen具有c / a比为1.615的六方密堆积晶体结构。它的熔点为3180°C（仅次于钨，是第二高的），其密度为所有金属中的第三高的，为21.04 g / cm〜3。 hen的硬度极高，其弹性模量为420 GPa（是钢的两倍）[1]。 hen不受热冲击的影响，并且没有延性的脆性转变温度。这种材料由于加工硬化系数大于0.5（高于铜）而极难加工[2]，并且rh在约400°C的空气中会氧化（升华）[3]。由于较高的熔化温度和氧化问题，via通过粉末冶金法进行生产，以进行大规模生产。然而，烧结和热等静压需要极高的温度，以固结至足够的密度以用于随后的变形处理。

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