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SUMMARY:The study of the phase composition of ceramic materials obtained b
 y SHS from previously mechanically activated reaction mixtures Ti-Cr-B
DTSTART;VALUE=DATE-TIME:20160706T102000Z
DTEND;VALUE=DATE-TIME:20160706T104000Z
DTSTAMP;VALUE=DATE-TIME:20260307T084752Z
UID:indico-contribution-1291@indico.inp.nsk.su
DESCRIPTION:Speakers: Victoria Kurbatkiina (National University of Science
  and Technology "MISiS)\nIn this work\, ceramic materials based on borides
  of transition metals were prepared by SHS compaction from the pre-mechani
 cally activated (MA) of the powder mixtures. The use of МА enables SHS p
 rocess in the low exothermic systems. The role of MA appeared in a simulta
 neous increase in heat evolution and heat evolution rate of the combustion
  reaction\, a positive influence on the thermodynamics and kinetics of the
  process.\nKinetics of the SHS process\, stages of chemical transformation
 s and structure formation in theTi Cr--B system were investigated.  It is 
 demonstrated that the interaction of the reagents on the solid phase mecha
 nism takes place at a temperature of the combustion. \nMA was found to mar
 kedly affect the combustion temperature and burning velocity of Ti–Cr–
 B blends. SHS reactions in Ti–Cr–B blends with Cr contents above 10% p
 roceeded with involvement of gas transport agents. The role of gas transpo
 rt was found to grow with increasing MA duration\, due to an increase in t
 he amount of boron oxides.\nThe mechanisms of combustion and structure for
 mation in Ti-Cr-B were well characterized using  different method such as 
  stop combustion front\, SEM\, EDS\, X-ray photoelectron spectroscopy\, XR
 D including the use of synchrotron radiation. \nResults\, the main reactio
 n is the formation of the titanium borides. Then\, the complex  borides ar
 e formed in the post combustion zone and the secondary structure formation
  zone. Ternary phases Cr4Ti9B and Ti2CrB2 were detected. Сr4Ti9B phase is
  formed at a chromium content of up to 20%\, second boride (Ti2CrB2) is fo
 rmed with increasing chromium concentrations up to 30%.\nIt is found that 
 they are chemical compounds - borides hexagonal lattice (structural types 
 hP28 / 5 and tP10 / 2).\nThe technology of compact samples of pre-activate
 d mixture Ti-Cr-B and their properties were studied.\n\nhttps://indico.inp
 .nsk.su/event/3/contributions/1291/
LOCATION:Budker INP Conference Hall
URL:https://indico.inp.nsk.su/event/3/contributions/1291/
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