Browsing by Subject "TiB2"

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Access status: Open Access ,
Badania nad kompozytami ziarnistymi dwutlenku cyrkonu z wtrąceniami $TiB_{2}$
(Data obrony: 2010) Moskała, Norbert
Wydział Inżynierii Materiałowej i Ceramiki
A novel method of the $YZrO_{2}/TiB_{2}$ structural composites obtaining is proposed in the work. The method involves pressure-less sintering of the composite powders in situ synthesized by solid state chemical reactions, leading to production of the $TiB_{2}$ particles among $YZrO_{2}$ grains. Titanium oxide, which is one of the $TiB_{2}$ precursors, is introduced into reaction mixture in the form of $Y_{2}O_{3}-TiO_{2}-ZrO_{2}$ solid solution nanopowders of variable $TiO_{2}$ concentration or as $Y_{2}O_{3}-TiO_{2}-ZrO_{2}$ and $ZrTiO_{4}$ mixture. The boric acid, amorphous boron and carbon powders are additional precursors. The method represents so called “bottom up” process, which enables crystallization of sub-micron $TiB_{2}$. The research showed that applying of amorphous boron and the synthesis temperature equal to $1300^{\circ}C$ suppresses formation of the impurities of titanium carbide, $Zr(C,B)$ solid solutions as well as segregation of $Y_{2}O_{3}$ into yttrium borate (which is unfavourable for the zirconia matrix phase composition). The concentration of $TiO_{2}$ in a recursors mixture correlates linearly with $TiB_{2}$ fraction in the composite powder. The $Y-ZrO_{2}/TiB_{2}$ composites sintered at $1500 – 1500^{\circ}C$ exhibited: Vickers hardness as high as 17.8 GPa, bending strength up to $985 MPa, K_{Ic}$ up to $7,2 MPa \cdot m^{-1/2}$, competitive durability in the cutting tools applications, and wear resistance even 3.7 times higher than that of the 3Y-TZP dense ceramics.
Access status: Restricted ,
Badania nad spiekaniem TiB2 z dodatkami boru i węgla
(Data obrony: 2020-01-22) Chyba, Anna
Wydział Inżynierii Materiałowej i Ceramiki
Access status: Restricted ,
Badania spektroskopowe powłok TiB2 wytwarzanych metodą magnetronowego rozpylania
(Data obrony: 2021-01-26) Piątkowski, Kamil
Wydział Inżynierii Metali i Informatyki Przemysłowej