Fabrication of SiC‐Whisker‐Reinforced MoSi₂ Composites by Tape Casting

Abstract

In this paper, we describe a procedure for the processing of SiC‐whisker‐reinforced MoSi2 composites via tape casting. Based on the characteristics of SiC whiskers and MoSi2 powder in aqueous and nonaqueous solvents, a slip formulation (solvent, dispersant, binder, etc.) has been developed. The formulation developed allows for a uniform distribution of SiC whiskers in the matrix, easy separation of the tapes from the polymeric carrier, convenient control of both tape thickness and orientation of SiC whiskers, and a low binder burnout temperature. The latter is important for the prevention of the oxidation of MoSi2 powder during the binder burnout in an oxidizing atmosphere.

MoSi2 laminate processed by tape casting: Microstructure and mechanical properties' investigation

“…Shaw and Abbaschian [51] fabricated an SiC-whisker-reinforced MoSi 2 multilayer by tape casting and hot pressing. By hot pressing the multilayered structure disappears and the MoSi 2 increase in toughness is obtained according to the presence of SiC whiskers.…”

Tape casting of AlN–SiC–MoSi 2 composites

“…A literature survey of tape casting slurry with different composition of MoSi 2 , AlN, SiC, indicates that the ceramic powders were generally dispersed in three kinds of solvent: methyl-ethyl-ketone/ethanol, 3À5 methyl-ethylketone/2-propanol 6,7 and trichloroethylene/ethanol 8 in their azeotropic mixture. A phosphate ester was most frequently used as deflocculant also in the MoSi 2 /Al 2 O 3 suspensions where negatively (MoSi 2 ) and positively (Al 2 O 3 ) charged powder surface were mixed.…”

“…A phosphate ester was most frequently used as deflocculant also in the MoSi 2 /Al 2 O 3 suspensions where negatively (MoSi 2 ) and positively (Al 2 O 3 ) charged powder surface were mixed. 3 To ensure the cohesion of the green tapes after the solvent evaporation, polyvinylbutyral polymer 3,6,8 and acrylic resins 7 were used as binder. Different phthalates 3,6 and polyethylene glycol 8 are used as plasticizer for this system to improve the flexibility and workability of the products.…”