Tungsten is a prime candidate for plasma facing materials (PFM) of internal components in fusion reactors due to its high thermal conductivity, high melting point and low sputtering yield. However, the brittleness of W at low temperature and the embrittlement caused by recrystallization and irradiation is a concern for this application of W engineering. To improve the properties, a modified W by the addition of a dispersion agent is introduced. The existence of dispersoids such as oxides (Y₂O₃, La₂O₃) or carbides (TiC, ZrC, HfC, Ta₂C) helps to improve the mechanical properties and migration of grain boundaries therefore suppressing the embrittlement. In this work, three types of dispersion modified W are processed: W–Y₂O₃, W–TiC and W–TiC–Y₂O₃. The materials are fabricated with novel wet chemical method followed by consolidation through spark plasma sintering (SPS). The microhardness and microstructure are studied in this work. Dispersoids’density, size, distribution, crystal structure as well as composition are also investigated. A range of characterization techniques is applied, including metallography microscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive spectroscopy.

钨因其高导热率，高熔点和低溅射产率而成为聚变反应堆内部组件的等离子饰面材料（PFM）的主要候选材料。然而，低温下钨的脆性以及由重结晶和辐照引起的脆化是钨工程的这种应用的关注点。为了改善性能，引入了通过添加分散剂的改性W。存在弥散体，例如氧化物（Y ₂ O ₃，La ₂ O ₃）或碳化物（TiC，ZrC，HfC，Ta ₂C）有助于改善机械性能和晶界迁移，因此抑制了脆化。在这项工作中，处理了三种类型的色散改性W：W–Y ₂ O ₃，W–TiC和W–TiC–Y ₂ O ₃。这些材料采用新颖的湿化学方法制造，然后通过火花等离子体烧结（SPS）进行固结。在这项工作中研究了显微硬度和显微组织。还研究了分散体的密度，大小，分布，晶体结构以及组成。应用了一系列表征技术，包括金相显微镜，扫描电子显微镜，透射电子显微镜和能量色散光谱。