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High-toughness composite nano ceramic material and preparation method thereof
The invention relates to a high-toughness composite nano ceramic material and a preparation method thereof, and belongs to the technical field of novel structural ceramic materials. The preparation method comprises the following steps: depositing a nano-zirconia layer on the surface of a nano-graphene sheet through a chemical vapor deposition method, wrapping the nano-graphene sheet to obtain modified nano-graphene, mixing the modified nano-graphene with zirconia fiber, boron nitride fiber and boride powder, and carrying out a freeze-drying process to form stacked particles with a layered structure. Then a ceramic green body is prepared through a dry pressing process, graphene has very high toughness, the surface of the graphene is wrapped with nano-zirconia, the oxidation resistance of the graphene is enhanced, the spark plasma sintering process reduces the sintering temperature and prevents graphene carbonization, and meanwhile, the optimized spark plasma sintering process improves the density of the ceramic; and the layered structure is combined with the phase change toughening mechanism of zirconium oxide and the high toughness characteristic of graphene, so that the high-toughness composite nano ceramic material is obtained.
本发明涉及一种高韧性复合纳米陶瓷材料及其制备方法，属于新型结构陶瓷材料技术领域。本发明在纳米石墨烯片表面通过化学气相沉积法沉积纳米氧化锆层并将纳米石墨烯片包裹得到改性纳米石墨烯，然后将改性纳米石墨烯和氧化锆纤维、氮化硼纤维、硼化物粉体混合后，经过冷冻干燥工艺形成堆叠的层状结构的颗粒，然后经过干压工艺制备陶瓷生坯，石墨烯本身具备很高的韧性，并且表面被纳米氧化锆包裹，增强了其抗氧化性能，放电等离子烧结工艺降低烧结温度，防止石墨烯碳化，同时，优化的放电等离子烧结工艺提高陶瓷的致密度，进一步提高陶瓷的韧性，层状结构结合氧化锆的相变增韧机理以及石墨烯的高韧性特点，得到高韧性复合纳米陶瓷材料。
High-toughness composite nano ceramic material and preparation method thereof
The invention relates to a high-toughness composite nano ceramic material and a preparation method thereof, and belongs to the technical field of novel structural ceramic materials. The preparation method comprises the following steps: depositing a nano-zirconia layer on the surface of a nano-graphene sheet through a chemical vapor deposition method, wrapping the nano-graphene sheet to obtain modified nano-graphene, mixing the modified nano-graphene with zirconia fiber, boron nitride fiber and boride powder, and carrying out a freeze-drying process to form stacked particles with a layered structure. Then a ceramic green body is prepared through a dry pressing process, graphene has very high toughness, the surface of the graphene is wrapped with nano-zirconia, the oxidation resistance of the graphene is enhanced, the spark plasma sintering process reduces the sintering temperature and prevents graphene carbonization, and meanwhile, the optimized spark plasma sintering process improves the density of the ceramic; and the layered structure is combined with the phase change toughening mechanism of zirconium oxide and the high toughness characteristic of graphene, so that the high-toughness composite nano ceramic material is obtained.
本发明涉及一种高韧性复合纳米陶瓷材料及其制备方法，属于新型结构陶瓷材料技术领域。本发明在纳米石墨烯片表面通过化学气相沉积法沉积纳米氧化锆层并将纳米石墨烯片包裹得到改性纳米石墨烯，然后将改性纳米石墨烯和氧化锆纤维、氮化硼纤维、硼化物粉体混合后，经过冷冻干燥工艺形成堆叠的层状结构的颗粒，然后经过干压工艺制备陶瓷生坯，石墨烯本身具备很高的韧性，并且表面被纳米氧化锆包裹，增强了其抗氧化性能，放电等离子烧结工艺降低烧结温度，防止石墨烯碳化，同时，优化的放电等离子烧结工艺提高陶瓷的致密度，进一步提高陶瓷的韧性，层状结构结合氧化锆的相变增韧机理以及石墨烯的高韧性特点，得到高韧性复合纳米陶瓷材料。
High-toughness composite nano ceramic material and preparation method thereof
一种高韧性复合纳米陶瓷材料及其制备方法
PENG WENWU (author) / LIU TIANXING (author) / HUANG YAN (author) / HUANG GUANRUI (author)
2023-01-06
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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