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Manufacturing and Testing of Ceramic Based Hybrid Composites with Various Fibers, Matrix Systems, and Processing Conditions.

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Title:Manufacturing and Testing of Ceramic Based Hybrid Composites with Various Fibers, Matrix Systems, and Processing Conditions.
Authors:Minei, Brenden M.
Contributors:Mechanical Engineering (department)
Date Issued:Aug 2018
Publisher:University of Hawaiʻi at Mānoa
Abstract:In this work, various types of Continuous Fiber Ceramic Composites (CFCCs) were manufactured using Polymer Infiltration and Pyrolysis (PIP) method for high mechanical performances. Two types of ceramic grade silicon carbide fibers, Nicalon™ and Hi-Nicalon™ Type S, as well as T300 carbon fiber were used as the reinforcements, and Polyramic® SPR-212, StarPCS™ SMP-10, and SMP-730 preceramic polymers were used as the matrix, in the study. Further, the effects of matrix sequence, referred to as “hybridization,” and PIP processing at 1,000°C and 1,500°C on flexural mechanical performances of these newly developed CFCCs have been investigated and compared to their base CFCCs with their pristine matrices. Matrix hybridization method uses one type of preceramic polymer during the initial molding process and for the first iteration of PIP, then subsequent iterations of PIP use another type of preceramic polymer to infiltrate. All reinforcement fabrics, made of the three fiber systems mentioned above, were used for CFCCs at 1,000°C PIP, while only the HI-Nicalon™ Types S was used for CFCCs at 1,500°C PIP. Characterization analysis of the samples using optical microscopy as well as scanning electron microscopy were conducted. ASTM Standard four-point bending test at room temperature was conducted to evaluate the flexural mechanical performance of the developed ceramic composite samples. The mechanical performances were also compared across various fiber and matrix systems as well as PIP processing conditions of 1,000°C and 1,500°C. The different matrices displayed unique performance properties, while the matrix hybridization averaged two unique preceramic polymer properties closer together. A finite element method simulation technique was employed to verify the test results of the selected CFCCs that mechanically performed the best in their respective categories. The higher 1,500°C PIP CFCCs had higher stiffness compared to the 1,000°C CFCCs due to the ceramic changing from amorphous to β-phase crystalline structure, while the lower 1,000°C CFCCs had higher strength, strain-to-failure, and toughness as compared with their 1,500°C PIP CFCC counterparts. Therefore, a manufacturing guideline is developed and suggested for the selection of the materials constituents and processing conditions depending on the desired mechanical properties for the developed CFCCs.
Description:M.S. Thesis. University of Hawaiʻi at Mānoa 2018.
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Mechanical Engineering

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