Abstract
The formation mechanism of TiC particles in a Ni-Ti-C system were revealed by using differential thermal analysis (DTA), XRD, and SEM to identify the reaction products in different temperature ranges. The results indicated that the synthesis mechanism of TiC in Ni-Ti-C system was complex; several reactions were involved in the combustion synthesis of TiC-Ni composite. The Ni-Ti intermediate phases play important roles during the formation of TiC. Moreover, the influence of heating rate on the size range of TiC was also discussed.
Highlights
Titanium carbide ceramic materials are attractive reinforcements utilized in metal matrix composites due to a unique combination of high melting temperature (3200 ◦ C), high hardness (3200 HV), low density (4.95 g/cm−3 ), good thermal and chemical stability, excellent wear resistance, and high fracture toughness [1]
To investigate the combustion synthesis mechanism of 20 wt % Ni-Ti-C system, the green bodies were heated to 1200 ◦ C at different heating rates by using a differential thermal analysis (DTA) instrument under argon atmosphere
The TiC-20 wt %Ni composite can be prepared by combustion synthesis using a 20 wt % Ni-Ti-C
Summary
Titanium carbide ceramic materials are attractive reinforcements utilized in metal matrix composites due to a unique combination of high melting temperature (3200 ◦ C), high hardness (3200 HV), low density (4.95 g/cm−3 ), good thermal and chemical stability, excellent wear resistance, and high fracture toughness [1]. The extremely high melting point of TiC made them essentially fabricated through powder consolidation technology. It is still difficult to prepare these materials from powders due to their strong covalent bonding and low self-diffusion coefficients even under high temperature and high pressure [2]. Some special manufacturing technologies have been developed to consolidate them, such as self-propagating high-temperature synthesis (SHS) [3,4], reactive hot pressing (RHP), spark plasma sintering (SPS) [1,5] and transient plastic phase processing (TPPP). It was found that the ignition temperature in Ti-C mixture prepared under optimized high-energy ball milling (HEBM) conditions can be greatly decreased [6]. The synthesis process is complex, and further improvement is necessary for industrial application
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