Effects of precoating on mechanical properties and microstructures of 3D SiO2f/Si3N4 composites using polyhydridomethylsilazane

Continuous silica fiber reinforced silica composites densified by polymer-derived silicon nitride: Mechanical properties and microstructures

“…6(a) we can see the precursor efficiently infiltrated into the porosity among the glass fibers. In our previous study [14], PHMS was used as precursor to prepare 3D glass fiber reinforced silicon nitride-based composites, and the results also showed a good infiltration of PHMS among the fibers because of its low viscosity and good wettability. Fig.…”

TEM Investigations on Three-Dimensional Silica Fiber Reinforced Silicon Nitride Composites

“…The composites prepared using polyhydridomethylsilazane (PHMS) by pyrolysis at 873K without fiber precoating (i.e., sample "A" in Ref. [2]) were denoted as "3DSN-M873", and the sample with fiber precoating (i.e., sample "B" in Ref. [2]) were denoted as "3DSN-M873-C" in this paper, respectively.…”

“…Strong adhesion of fiber/matrix interface was observed by scanning electron microscope, thus leading to brittle, low-strength composites. In another previous study [2] , polyhydridomethylsilazane (PHMS) was used as a preceramic polymer to fabricate 3D SiO 2f /Si 3 N 4 composites, and the effects of precoating process on the mechanical properties and microstructures of the composites were mainly investigated. The composite with precoating treatment showed a non-brittle fracture behavior with long fiber pull-out in the fracture surface, resulting in a high flexural strength of 114.5MPa.…”

Effects of thermal load on mechanical properties and microstructures of 3D SiO2f/Si3N4–BN composites using polyborosilazane

“…First, 3D SiO 2f fabric was precoated in order to prevent the reaction between fiber and matrix [7]. Second, the fabric was infiltrated with hybrid precursor under vacuum.…”

“…Recently, three-dimensional quartz fiber reinforced Si 3 N 4 ceramic composites were prepared by Qi et al [7,8] at low temperature and the composites have good mechanical and dielectric properties. However, the ablation properties of the composites were not examined.…”