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Method for preparing cordierite ceramic from fly ash
The invention relates to a method for preparing cordierite ceramic by using fly ash. The method comprises the following steps: supplementing a magnesium-containing raw material, a silicon-containing raw material and an aluminum-containing raw material into pretreated fly ash, and uniformly mixing to form precursor powder; mixing a compound capable of simultaneously generating synergistic effects of phase change toughening, lattice distortion to promote crystal transformation, liquid phase sintering and the like into the precursor powder, and performing dry pressing and cold isostatic pressing on the obtained mixed powder to obtain a ceramic biscuit with high strength, controllable shape and uniform microstructure; and drying the biscuit, and sintering at 1100-1450 DEG C to obtain the cordierite ceramic. The preparation method has the beneficial effects that the prepared cordierite ceramic is excellent in thermal and mechanical properties, the compressive strength of the cordierite ceramic is as high as 511MPa, the thermal expansion coefficient is as low as 2.48 * 10 <-6 >/DEG C, the preparation cost is relatively low, and the cordierite ceramic is suitable for a honeycomb ceramic extrusion molding process.
本发明涉及一种利用粉煤灰制备堇青石陶瓷的方法，在预处理后的粉煤灰中补充含镁原料、含硅原料及含铝原料并混合均匀形成前驱物粉体；在前驱物粉体中混入一种能同时产生相变增韧、晶格畸变促进晶型转化及促进液相烧结等协同作用的化合物，所得混合粉体通过干压后冷等静压获得强度高、形状可控、显微结构均匀的陶瓷素坯；将素坯干燥后在1100‑1450℃下烧结得到堇青石陶瓷。本发明的有益效果是：本发明制备的堇青石陶瓷的热学与力学性能优异，其抗压强度高达511MPa，热膨胀系数低至2.48×10‑6/℃，制备成本较低，且适用于蜂窝陶瓷挤出成型工艺。
Method for preparing cordierite ceramic from fly ash
The invention relates to a method for preparing cordierite ceramic by using fly ash. The method comprises the following steps: supplementing a magnesium-containing raw material, a silicon-containing raw material and an aluminum-containing raw material into pretreated fly ash, and uniformly mixing to form precursor powder; mixing a compound capable of simultaneously generating synergistic effects of phase change toughening, lattice distortion to promote crystal transformation, liquid phase sintering and the like into the precursor powder, and performing dry pressing and cold isostatic pressing on the obtained mixed powder to obtain a ceramic biscuit with high strength, controllable shape and uniform microstructure; and drying the biscuit, and sintering at 1100-1450 DEG C to obtain the cordierite ceramic. The preparation method has the beneficial effects that the prepared cordierite ceramic is excellent in thermal and mechanical properties, the compressive strength of the cordierite ceramic is as high as 511MPa, the thermal expansion coefficient is as low as 2.48 * 10 <-6 >/DEG C, the preparation cost is relatively low, and the cordierite ceramic is suitable for a honeycomb ceramic extrusion molding process.
本发明涉及一种利用粉煤灰制备堇青石陶瓷的方法，在预处理后的粉煤灰中补充含镁原料、含硅原料及含铝原料并混合均匀形成前驱物粉体；在前驱物粉体中混入一种能同时产生相变增韧、晶格畸变促进晶型转化及促进液相烧结等协同作用的化合物，所得混合粉体通过干压后冷等静压获得强度高、形状可控、显微结构均匀的陶瓷素坯；将素坯干燥后在1100‑1450℃下烧结得到堇青石陶瓷。本发明的有益效果是：本发明制备的堇青石陶瓷的热学与力学性能优异，其抗压强度高达511MPa，热膨胀系数低至2.48×10‑6/℃，制备成本较低，且适用于蜂窝陶瓷挤出成型工艺。
Method for preparing cordierite ceramic from fly ash
一种利用粉煤灰制备堇青石陶瓷的方法
GU YAJIE (author) / LIU YANGQIAO (author) / LI JIAYI (author) / CHANG XINGLAN (author) / SUN KE (author) / XI SHUANG (author)
2022-11-11
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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