Funct. Mater. 2020; 27 (2): 354-362.
Influence of titanium diboride particles size on the structure of TiB2-(Fe-Mo) composite materials
1J.Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanovsky Str., 03068 Kyiv, Ukraine
2Sumy National Agricultural University, 160 Kondratev Str., 40021 Sumy, Ukraine
The influence of titanium diboride particles size (9-10 μm, 2-3 μm, 500-700 nm) on the structure formation of TiB2-80 wt.%(Fe-13 wt.%Mo) composite materials was investigated. The differential-thermal and electron-probe analyses have shown that a decrease in the size of TiB2 particles up to 2-3 μm does not substantially influence on the composite materials structure formation. The structure of the investigated composite materials consists of an iron-based matrix, TiB2 and Mo2FeB2 hard borides. The addition of nano-sized TiB2 particles (70-100 nm) is unreasonable because this promotes dissolution and recrystallization processes of titanium diboride; as a result, their size increases up to 5-6 μm and large amounts of Fe-Fe2B and Fe-Mo2FeB2 eutectics are formed.
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