Effect of CVD-BN Coating on Mechanical Properties of Continuous Silicon Carbide-Fiber

Yoshiyasu ITOH; Tsuneji KAMEDA; Katsutoshi NISHIDA; Masanobu UMEZAWA; Yoshikazu IMAI; Hiroshi ICHIKAWA

doi:10.2109/jcersj.106.830

Yoshiyasu ITOH, Tsuneji KAMEDA, Katsutoshi NISHIDA, Masanobu UMEZAWA, Yoshikazu IMAI, Hiroshi ICHIKAWA

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Keywords: Silicon carbide-fiber, Boron nitride, CVD-BN coating, Young's modulus, Tensile strength, Residual stress

JOURNAL FREE ACCESS

1998 Volume 106 Issue 1236 Pages 830-834

DOI https://doi.org/10.2109/jcersj.106.830

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Abstract

Toughness of ceramic-matrix composites can be optimized through coatings the reinforcing fibers. Chemical vapor deposition (CVD) process is a key technology for fiber coatings. The mechanical properties of continuous silicon carbide fibers (Hi-Nicalon) have been studied as a function of the thickness of the pyrolytic boron nitride (P-BN) coating by CVD process. The compressive residual stress at the P-BN coating layer decreases slightly with increasing the coating thickness. It is considered that, with including the residual stress effect, cracking of the P-BN coating layer occurs first in a monotonic tensile fracture test. In addition no degradation of the silicon carbide-fiber in ultimate tensile strength is observed regardless of the P-BN coating thickness.

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