Damage mechanisms and fiber orientation effects on the load-bearing capabilities of a NEXTEL/BLACKGLAS low-cost ceramic composite

Abstract

In this article, the fiber orientation effect on the load-bearing capabilities of a NEXTEL/BLACKGLAS low-cost composite was experimentally investigated, and damage mechanisms were analyzed. Ultrasonic nondestructive evaluation (NDE) was performed to interrogate the composite samples before testing. A four-point bending test was conducted to study the mechanical behavior. Scanning electron microscopy (SEM) fractography and SEM energy-dispersive X-ray spectroscopy (EDXS) along with SEM/EDXS elemental mapping were employed to characterize damage mechanisms, microstructures, and the microchemical distribution of elements following mechanical tests. A mechanistic understanding of the fracture behavior of the NEXTEL/BLACKGLAS ceramic composite was provided.

Correlation of the mechanical properties to the fiber–matrix adhesion of Nextel 312™ fiber/BN/Blackglas™ composites

“…Increases »700% in exural strength and »1000% in the strain-to-failure suggest that the BN-coated ber composites are stronger and tougher in exure than the as-received ber composites. The strength of the BN-coated ber composites agree with the exural strengths reported by Zhao et al [19]. At ultimate strength, both of the composites failed on the tensile stress side.…”

“…This active research area has led to the development of silicon oxycarbide/ Al 2 O 3 composites [9 -11] and to the production of complex-shaped components at low cost. Aluminoborosilicate / silicon oxycarbide composites have demonstrated the ability to retain enhanced fracture toughness and strength [12,13]. The objective of this work is to extend this research area by correlating the macromechanical properties with the ber -matrix micromechanical properties of Nextel 312™ ber/ Blackglas™ composites.…”

Damage mechanisms and fiber orientation effects on the load-bearing capabilities of a NEXTEL/BLACKGLAS low-cost ceramic composite

“…The transducer light elements starting with boron possible. [28][29][30][31][32][33] The energy resolution of EDXS for B and N was ϳ70eV. was immersed in a water tank.…”

NDE Characterization and Mechanical Behavior in Ceramic Matrix Composites

“…In particular, the ultrasonic testing (UT) method is frequently used for such measurements [4,6]. UT has become one of the most commonly used inspection techniques to determine the quality and internal structure of composite materials [4][5][6][7][8]. The attenuation of ultrasonic signals through the material, which results from the interactions between ultrasonic waves and defects or microstructural features in the composite, can be determined by measuring transmitted ultrasonic amplitudes.…”

“…The attenuation of ultrasonic signals through the material, which results from the interactions between ultrasonic waves and defects or microstructural features in the composite, can be determined by measuring transmitted ultrasonic amplitudes. UT has been successfully applied to characterize composites based on variations in transmitted ultrasonic amplitudes [4][5][6][7][8].…”