...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of co-reduction of Cr_2O_3 and V_2O_5 on combustion synthesis of (Cr_(1-x)V_x)_2AlC/Al_2O_3 solid solution composites
【24h】

Effects of co-reduction of Cr_2O_3 and V_2O_5 on combustion synthesis of (Cr_(1-x)V_x)_2AlC/Al_2O_3 solid solution composites

机译：Cr_2O_3和V_2O_5共还原对（Cr_（1-x）V_x）_2AlC / Al_2O_3固溶体复合材料燃烧合成的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Solid solution composites of (Cr,V)_2AlC/Al_2O_3 with different substitutional proportions were fabricated by self-sustaining combustion involving aluminothermic reduction of oxide precursors. Two reaction systems with powder combinations of Cr_2O_3-V_2O_5-Al-Al_4C_3 and Cr-V_2O_5-Al-Al_4C_3 were studied. The degree of atom replacement on the (Cr,V)_2AlC phase ranging from 10 to 70 at.% of vanadium in the substitution site was explored. Experimental evidence showed that reaction exothermicity was enhanced by increasing V_2O_5 and Al. Combustion of the samples involving co-reduction of Cr_2O_3 and V_2O_5 was achievable over the full span of stoichiometries and Al_2O_3-added (Cr_(1-x)V_x)_2AlC composites with x = 0.1-0.7 were produced. However, the combustibility, flame propagation rate, and product composition of Cr-con-taining samples were greatly affected by the contents of V_2O_5 and Al. As a result, the MAX solid solution phase was formed only at the stoichiometry of (Cr_(1-y)V_yAlC with y = 0.4. For Cr-containing samples of y ≤ 0.3, combustion failed to be initiated because of low exothermicity. Additionally, the high combustion velocity causing lack of sufficient reaction time was responsible for no yield of (Cr_(1-y)V_yAlC with y ≥ 0.5.
机译：通过自持燃烧，包括铝热还原氧化物前驱体，制备了具有不同取代比例的（Cr，V）_2AlC / Al_2O_3固溶体复合材料。研究了两种具有Cr_2O_3-V_2O_5-Al-Al_4C_3和Cr-V_2O_5-5-Al-Al_4C_3的粉末组合的反应体系。探索了（Cr，V）_2AlC相上取代位点处钒的原子取代程度，钒的范围为钒的10至70 at。％。实验证据表明，通过增加V_2O_5和Al可以增强反应放热性。在化学计量的整个范围内均可实现涉及Cr_2O_3和V_2O_5共还原的样品燃烧，并制得了x = 0.1-0.7的Al_2O_3添加的（Cr_（1-x）V_x）_2AlC复合材料。但是，含铬样品的可燃性，火焰传播速率和产物组成受V_2O_5和Al含量的影响很大。结果，仅在化学计量为（Cr_（1-y）V_yAlC且y = 0.4时才形成MAX固溶相。对于y≤0.3的含Cr样品，由于放热低而无法开始燃烧。 ，导致缺乏足够的反应时间的高燃烧速度导致（Cr_（1-y）V_yAlC y≥0.5的无收率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号