Melt processed multiphase ceramic waste forms for nuclear waste immobilization
Melt processed multiphase ceramic waste forms for nuclear waste immobilization
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DOI：
10.1016/j.jnucmat.2014.07.035
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发表时间：
2014-11-01
影响因子：
3.1
通讯作者：
Brinkman, Kyle S.
中科院分区：
文献类型：
--
作者：
Amoroso, Jake;Marra, James C.;Brinkman, Kyle S.
与传统的硼硅酸盐玻璃废物形式相比，陶瓷废物形式具有更高的耐久性和废物负荷的潜力，是核废料固定化的有希望的宿主。陶瓷通常使用热压，火花等离子烧结和传统的固态反应来加工，然而这些方法在生产规模上可能过于昂贵或不切实际。最近，熔体加工已被研究作为固态烧结方法的替代方法。鉴于熔体技术目前在一些国家用于高放废物（HLW）的玻璃化，熔体处理的技术成熟度似乎优于烧结方法。本工作报告了从熔体中加工的候选多相陶瓷成分的发展。为了促进含Cs的荷兰石相的形成和稳定性而开发的Cr添加剂成功地应用于熔体加工的多相陶瓷中。控制氧化还原条件抑制了不良的含Cs-Mo相，Al和Fe的加入降低了熔融温度。(C) 2014 Elsevier B.V.版权所有
Ceramic waste forms are promising hosts for nuclear waste immobilization as they have the potential for increased durability and waste loading compared with conventional borosilicate glass waste forms. Ceramics are generally processed using hot pressing, spark plasma sintering, and conventional solid-state reaction, however such methods can be prohibitively expensive or impractical at production scales. Recently, melt processing has been investigated as an alternative to solid-state sintering methods. Given that melter technology is currently in use for High Level Waste (HLW) vitrification in several countries, the technology readiness of melt processing appears to be advantageous over sintering methods. This work reports the development of candidate multi-phase ceramic compositions processed from a melt. Cr additions, developed to promote the formation and stability of a Cs containing hollandite phase were successfully incorporated into melt processed multi-phase ceramics. Control of the reduction-oxidation (Redox) conditions suppressed undesirable Cs-Mo containing phases, and additions of Al and Fe reduced the melting temperature. (C) 2014 Elsevier B.V. All rights reserved.