LAUSR

Abstract Composites with a high ceramic content (60 vol% TiC) and residual porosity below 1.9% were fabricated through liquid infiltration at 1515 °C under argon atmosphere. Scanning electron microscopy revealed a homogeneous distribution of the matrix phases and composite reinforcement, with slight superficial smoothing of the TiC particles due to a dissolution-precipitation process. System thermodynamics predict the partial dissolution of TiC particles and their precipitation during cooling, as well as the formation of insignificant quantities of Ti3O5 and Ti2O3 oxides. Nevertheless, only the phases corresponding to Ni and TiC were detected through x-ray diffraction. The microstructure, hardness values, modulus of elasticity, and flexural strength indicated strong adhesion between the ceramic and the metal. Good adhesion also favored the heat flow between the components, obtaining an effective thermal conductivity of 44–48.9 W/mK at a room temperature range of up to 700 °C. The incorporation of TiC particles lineally reduced the coefficient of thermal expansion (CTE) of the composite. Thermal cycling tests carried out from 25 to 450 °C showed that the composite exhibited an insignificant hysteresis cycle and a small residual plastic deformation, indicating high thermal stability. Thanks to its excellent dimensional stability, the composite is a potential candidate for applications in advanced engineering.