Influence of Supersaturation on Growth Behavior and Mechanical Properties of Polycrystalline 3C-SiC on W Wire Substrate

As an important reinforcement for metal matrix composites, the microstructure and mechanical properties of W-core SiC filament have drawn increasing attentions among researchers. In this work, growth behavior polycrystalline 3C-SiC on W-wire substrate in chemical vapor deposition (CVD) process evolution preparation filament, were investigated as a function gas-phase supersaturation. Kinetic studies revealed that grains was limited by surface reactions at both 850 °C 1050 °C, deposit experienced similar morphological changes from porous structure to large clusters, with increase Structural analyses tests show production pores amorphous phase low supersaturation, 9.6 × 107 resulted reduction modulus hardness deposits, 270.3 GPa 33.9 GPa, while reduced structural defects (e.g., stacking faults twins) highly (111) orientated grains, well improved quality obtained medium supersaturation 1.6 enhanced tensile strength Weibull 2.88 11.2, respectively. During variation density is controlled critical nucleation energy two-dimensional (2D) nucleus.