A study on preparation of Mo–30W alloy by aluminothermic co-reduction of mixed oxides
A study on preparation of Mo–30W alloy by aluminothermic co-reduction of mixed oxides
复制标题
DOI：
10.1016/j.jallcom.2004.10.053
复制
发表时间：
2005-05
影响因子：
6.2
通讯作者：
S. Majumdar;G. Kale;I. Sharma
中科院分区：
文献类型：
--
作者：
S. Majumdar;G. Kale;I. Sharma
在本研究中，已经研究了制备Mo-30 W合金的替代路线，目的是克服常规工艺的局限性。该工艺包括钼和钨的混合氧化物的铝热共还原，然后重熔。共还原工艺处理廉价的氧化物材料，并确保还原阶段的组成均匀性。不容易获得的基本上需要的氧化物中间体WO 2和MoO 2，被迫氢还原的相应的三氧化物，并简要讨论。通过化学分析、光学显微镜和硬度测试进一步表征合金纽扣。为了提高Mo-30 W合金的抗高温氧化性能，采用包埋共渗技术在Mo-30 W合金表面制备了结合均匀的Al-Si涂层。采用光学显微镜、硬度计和电子探针对涂层进行了表征。
In the present investigation, an alternate route for preparing Mo–30W alloy has been studied with the aim to surmount limitations of conventionally followed techniques. The process consists of aluminothermic co-reduction of mixed oxides of molybdenum and tungsten followed by remelting. The co-reduction process deals with cheap oxide materials and assures compositional homogeneity during the reduction stage. No easy availability of the essentially needed oxide intermediates WO2and MoO2, compelled hydrogen reduction of the respective tri-oxides and is briefly discussed. The alloy button was further characterized by chemical analysis, optical microscopy and hardness testing. A pack cementation technique has been used to form uniformly adherent Al–Si coating on Mo–30W alloy in order to enhance high temperature oxidation resistance performance. The coating has been characterized using optical microscopy, hardness tester and EPMA.