Performance Optimization of SiO<sub>2f</sub>/SiO<sub>2</sub> Composites Derived from Polysiloxane Ceramic Precursors
In this paper, polymethylhydrosiloxane (PMHS) and ethanol were used as raw materials to synthesize the ceramic precursor of side ethoxy polysiloxane (PESO) using dehydration and a dealcoholization reaction, which had a ceramic yield of 87.15% and a very low residual carbon content. With the quartz f...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/6/1385 |
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| Summary: | In this paper, polymethylhydrosiloxane (PMHS) and ethanol were used as raw materials to synthesize the ceramic precursor of side ethoxy polysiloxane (PESO) using dehydration and a dealcoholization reaction, which had a ceramic yield of 87.15% and a very low residual carbon content. With the quartz fiber as a reinforcer, the silica matrix composites (SiO<sub>2f</sub>/SiO<sub>2</sub>) with a double-layer interface (PyC-SiO<sub>2</sub>/BNNSs) coating were manufactured using precursor impregnation pyrolysis (PIP). The as-prepared SiO<sub>2f</sub>/SiO<sub>2</sub> possessed an excellent mechanical property, which exhibited obvious fiber pull-out and debonding phenomena from a fracture morphology. The flexural strength and fracture toughness of SiO<sub>2f</sub>/SiO<sub>2</sub> reached 63.3 MPa and 2.52 MPa·m<sup>1/2</sup>, respectively. Moreover, the SiO<sub>2f</sub>/SiO<sub>2</sub> had suitable dielectric properties, with a dielectric constant of about 2.5 and a dielectric loss of less than 0.01. This work provides an important concept for the enhancement of the dielectric properties and mechanical properties of quartz fiber-reinforced ceramic matrix composites, as well as in the preparation of wave-transmissivity composites. |
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| ISSN: | 1420-3049 |