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RISS 인기검색어
- 검색키워드
- 저자 : El-Amir Ahmed A. M. (검색결과 2 건)
- 무료
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MgAl2O4-reinforced c-ZrO2 ceramics prepared by spark plasma sintering
El-Amir Ahmed A. M.,Li Shufeng,Abdelgawad Mahmoud,Ewais Emad M. M. 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.5
c-zirconia ceramic composites have been synthesized by spark plasma sintering (SPS) technique from commercial m-ZrO 2 , Y 2 O 3 and waste-derived magnesium aluminate spinel (MA) powders. In this study, eff ect of MA addition on stabilization and reinforcement of 5 mol% yttria-stabilized zirconia (YSZ) was carefully investigated. Spark plasma sintering of designed powder mixtures at 1400 °C for 30 min and 40 MPa produce fully dense compacts with an average grain size of 0.5–10 μm. The pressure was gradually increased up to 40 MPa using argon gas and was kept until the end of the sintering process. The refi ned microstructure (0.5–10 μm) obtained in this study has achieved superior compaction resistance values that are ten times more than strength values of conventionally sintered specimens. Such improvement in compaction resistance of the sintered specimens was attributed to particle size refi nement and grain boundary enhancement. What’s more, spark-plasma sintered composites containing 10–50 wt% MA revealed higher resistance to low temperature degradation (LTD) than the reference composite that doesn’t contain MA spinel; where about ~ 2.8% of t-ZrO 2 was converted into m-ZrO 2 in case of the latter composite while aging test didn’t infl uence at all on the structure of the former composites. The outcomes indicated that MA has a signifi cant eff ect on m-ZrO 2 stabilization into a cubic phase structure that concurrently owned an enhanced and comparable compression resistance to Yttrium-doped t-ZrO 2 (Y-TZP). In this respect, the ternary oxide ceramic composite systems prepared in this study present huge potential for development c-ZrO 2 -based industrial ceramics with a wide spectrum of mechanical characteristics for high-tech engineering applications of harsh-stress and humid environments.
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Production of high-quality glass foam from soda lime glass waste using SiC-AlN foaming agent
El-Amir Ahmed A. M.,Attia Mohammed A. A.,Fend Thomas,Ewais Emad M. M. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.4
This research presents the possibility of producing durable foam glasses from glass cullet using SiC/AlN foaming agent. The foaming agent generated by the SiC and AlN couple results in a more homogeneous microstructure and thus the emergence of foam glasses with better properties compared to the nitride foaming agent used alone in our previous work. The fabricated foam had a crack-free, 3-D cellular structure with macropores whose geometries varied between elliptical-, pentagonal-, and hexagonal-shaped constructions. It also had a lightweight (≥ 0.18 g/cm 3 ), high cold crushing strength (≤ 4.5 MPa), low thermal conductivity (0.09–0.16 W/m K), and contained more than ~ 89 vol.% gas bubbles enclosed between 11 vol.% impervious glass walls. The properties accomplished by the foam prepared in this work conform with the requirements of international standard for commercial glass foams, demonstrating its strong capability to be utilized in potential applications in sustainable buildings and energy efficiency in industry.
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