Development of High Performance Hierarchical Multi-Functional Ceramic Nanocomposites Employing Carbon-Nanotube Nanoforest and Pre-Ceramic Polymers
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2020
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University of Hawaii at Manoa
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This work presents the effects of continuous fiber-reinforced ceramic composites (CFCCs) under various applications and testing and processing conditions. The mechanical performance of the CFCCs developed using nanotechnology was investigated for their utility in complex structures used in space, aerospace, chemical processing, electronics, defense, and renewable energy and thus demonstrated in the manufacture of a sandwich structure as a prototyping exercise. The effects of microparticle, nanoparticle, and carbon nanotube reinforcements on processing and flexural mechanical performance of CFCCs using PIP have been reported here in an experimental investigation. Characterization analysis of the samples using scanning electron microscopy were also conducted and reported here. Several systems of CFCC’s utilizing Toray® T300 plain weave carbon fiber (CF) fabric, SiC-β phase nanoparticles (NPs) and microparticles (MPs), carbon nanotube Nanoforests (NFs), and hybrid systems of pre-ceramic polymers (i.e., Starfire PCS SMP-10 and Polyramic SPR-212) were manufactured and tested using a 4-point bending method, single lap shear method, and single specimen double shear bolted joint method. Four-point bending test [1] was also conducted at room temperature to evaluate the flexural mechanical performance of six different CFCC’s (i.e., those with MPs and NPs, with NFs, with sizing and those without), demonstrating that CFCC’s utilizing 2-μm SiC-β MPs and 55 nm SiC-β NPs along with 30-40 μm Nanoforest can yield an increases in flexural strength and toughness. The high performing CFCC was later used to make a Whiffle Plate sandwich structure. This research successfully demonstrated the applicability of the pre-ceramic polymer SMP-10 loaded with 45% SiC MPs as an MP-Micro-adhesive (i.e., SMP-10 with MPs) to join the manufactured Whiffle plate face-sheets to the carbon honeycomb core. In the final phase of this research, the bonded and bolted hybrid nanocomposite specimens were manufactured and tested using ASTM standards for single-lap shear joints and bolted joints, further revealing the superior performances of the adhesives using NFs and of the nanocomposites using NFs.
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Ceramic-matrix composites, Carbon nanotubes, Nanocomposites (Materials), Pre-ceramic polymers
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