Abstract
The composite powder of TiN-BN is of interest from the point of view of the use for sintering the TiN-BN composite ceramics, which compared with TiN ceramics would have less britlleness, better machinability and good tribological properties. Possibility of obtaining a composite powder of TiN-BN with the application of process of combustion synthesis (CS) or self-propagating high-temperature synthesis (SHS) from powder mixtures of sodium azide and halide salts KBF4, NH4BF4, (NH4)2TiF6 and Na2TiF6 as precursors of titanium and boron was investigated. It was shown that these mixtures are capable of burning and obtaining agglomerated composite powders. TiN-BN powder with an admixture of KF is formed only in combustion of
Highlights
The titanium nitride (TiN) relates to refractory compounds, has high hardness, wear resistance, heat resistance, corrosion resistance (Pierson, 1996)
Calculation of the mass of the components of the initial mixture for azide combustion synthesis process was made taking into account the stoichiometric ratio of the components in the "boron halide salt - sodium azide titanium halide salt" systems
The number of halogen in halide salts was required to fully bind sodium released during the decomposition of sodium azide NaN3 to a neutral compound - sodium chloride or fluoride
Summary
The titanium nitride (TiN) relates to refractory compounds, has high hardness, wear resistance, heat resistance, corrosion resistance (Pierson, 1996). Little is known of the works on the regularities of sintering of TiN and the study of mechanical properties of the bulk sintered ceramics of TiN (Kuwahara et al, 2001; Russias et al, 2005; Russias et al, 2007; Xue et al, 2013). The results of these works show that the main property of such ceramics is a high hardness, and the ceramics is recommended for tribological applications. Poor machinability, the need for high temperatures during sintering, in which decomposition of TiN begins, are not yet decided
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