Role of Interfacial Debonding and Matrix Cracking in the Effective Thermal Diffusivity of Alumina‐Fiber‐Reinforced Chemical‐Vapor‐Infiltrated Silicon Carbide Matrix Composites

Abstract

The thermal diffusivity of a biaxial weave alumina-fiberreinforced chemical-vapor-deposited (CVD) Sic composite heated to 1500°C, which is above the manufacturing temperature, was found to exhibit an increase for heat flow parallel to the fiber plane, whereas a decrease was observed perpendicular to the fiber plane. The increase parallel to the fiber plane was thought to be due to the annealing of the fibers and matrix. The decrease perpendicular to the fiber plane was found to be the result of interfacial debonding and matrix cracking within the plane of the fibers. [

Microstructural development and hardness of TiB2–B4C composite samples: Influence of consolidation temperature

“…The particulate-reinforced ceramic matrices, i.e., containing hard ceramic inclusions in a ceramic matrix exhibit several advantages compared to their single phase counterpart. A few of the advantages include attractive combinations of strength, thermal shock resistance, better wear resistance, enhanced fracture toughness, and a noncatastrophic failure mode [15][16][17]. To overcome the inherent limitations of the monolithic ceramic constituents the primary aim of this research was to consolidate fine powders of TiB 2 and B 4 C. Overall combination of the TiB 2 and B 4 C ceramics brings out the latent advantage of each while concurrently eliminating shortcomings of the individual phases.…”

Effects of Matrix Cracks on the Thermal Diffusivity of a Fiber‐Reinforced Ceramic Composite

“…However, these mechanisms are detrimental to other properties pertinent to thermostructural performance, especially the thermal diffusivity. 2,3 The latter property is important in determining the magnitude of thermal stresses when the material is subjected to temperature gradients and is therefore relevant to its thermal shock resistance.…”

Structural evolution of TiH2–B4C during ball milling and subsequent heat treatment

“…It is believed, however, that the development of single-phase ceramics has reached its optimum stage, and the attention of researchers has now turned to develop ceramic matrix composites (CMCs). CMCs offer considerable advantages over monolithic ceramics due to their enhanced fracture toughness and noncatastrophic failure mode [1]. The TiB 2 -TiC composites prepared from pre-mixed TiB 2 and TiC powders have shown that the fracture toughness and wear resistance of the composites are significantly higher than those of the individual TiB 2 and TiC phases [2].…”