Sintering Behavior, Microstructure, and Mechanical Properties: A Comparison among Pressureless Sintered Ultra-Refractory Carbides

Figure 6

(a) SEM micrographs of the polished surface of HC20. The bright grains are HfC, the dark phase is MoSi₂, the arrow indicates the reaction product formed during sintering containing Hf-Mo-Si-C. (b) BF-TEM image evidencing the reaction product, identified as (Hf,Mo)₅Si₃ and the corresponding electron diffraction pattern and (c) the EDS spectrum.

(a)

(b)

(c)