Thermal conductivity of advanced TiC reinforced metal matrix composites for polymer processing applications

Abstract

Tools used for fabricating polymers are often required to have low thermal conductivities, e.g. for pelletizing, because this lowers the risk of the polymer nozzle being obstructed by molten polymer solidifying as it exits. Latterly, advanced corrosion and wear resistant metal matrix composites (MMCs) are used for pelletizing tools. Therefore, with respect to polymer processing it is important to know how the thermal conductivity of MMC gets influenced by hard phase and metal matrix contribution. In this study, the thermal conductivity of a TiC reinforced corrosion and wear resistant MMC gets analyzed. Especially the influence of chemical interdiffusion between TiC and metal matrix on the resulting thermal conductivity gets analyzed. It is shown that changes in the chemical composition lead to distinct decrease in thermal conductivity of the TiC which has to be considered when MMC thermal conductivities have to be examined.

Ceramic–Metal (Cermet) Composites: A Review of Key Properties and Synthesis Methods Focused on Nuclear Waste Immobilization

“…In this plot, composites located in the lower-right quadrant are desirable, and material discovery efforts should be expended to reveal as such. Composite compositions and references from Figure are captured in Table S3 (Supporting Information). − Similar to thermal conductivity, it is also useful to model the coefficient of thermal expansion (CTE) for a given composite. Several models have been proposed to predict the CTE of the particle containing composites and are listed in Table , where α c is the linear CTE, V is the volume fraction, K is the bulk modulus, and G is the shear modulus.…”

Characterization of recycled TiC and its influence on the microstructural, tribological, and corrosion properties of a TiC-reinforced metal matrix composites

“…In addition, the volume fraction of the (Ti,X)C in MMC-R is decreased compared to the MMC. The main reason for this behavior is due to the change in TiC density caused by the diffusion of molybdenum into the (Ti,X)C. Since Mo has a higher mole mass than Ti, diffusion of Mo into the TiC increases the density of the (Ti,Mo)C. Wilzer et al measured a density of 5.13 AE 0.06 g/cm 3 for recycled (Ti,X)C. 14 Whereas the density of stoichiometric TiC is 4.91 g/cm 3 . 15 Owing to the higher density of (Ti,X)C and because the hard particles were admixed by weighing, a smaller amount of (Ti,X)C was used for the production of the MMC-R compared to MMC.…”

A novel route towards well-dispersed short nanofibers and nanoparticles via electrospinning

“…Metal carbides represented by WC and TiC possess extremely high hardness, resulting in many important applications such as cutting tools, 45 wear-resistant coatings, 46 repair of mechanical parts, 47 and composite materials. 48 Due to the coexistence of metallic bond and covalent bond, metal carbides have very high melting point and hardness. 49 Since the close-packed lattice of octahedral coordination for the metal atom is close-packed and the embedded carbon produces a substantial gain in stability, metal carbides have good chemical stability.…”