Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of high-density silicon carbide ceramic
The invention discloses a preparation method of high-density silicon carbide ceramics, and belongs to the technical field of silicon carbide ceramics, the preparation method comprises the following steps: preparing a sintering aid, preparing composite whiskers, mixing materials, carrying out compression molding, and sintering; the preparation of the sintering aid comprises the following steps: preparing mixed sol, compounding and carrying out surface modification. The preparation of the composite whisker comprises the following steps: preparing alumina nanowire gel, mixing, and growing the whisker. The step of material mixing comprises the following steps: mixing deionized water, silicon carbide powder, a sintering aid, composite whiskers, polyvinyl alcohol 1788, polyethylene glycol 2000 and tetramethylammonium hydroxide, and then carrying out ball milling and spray drying to obtain mixed powder; the density, the mechanical property and the fracture toughness of the silicon carbide ceramic can be improved, meanwhile, the hardness, the high-temperature mechanical property and the thermal shock resistance of the silicon carbide ceramic are improved, and cracks are avoided in the sintering process.
本发明公开了一种高密度碳化硅陶瓷的制备方法，属于碳化硅陶瓷技术领域，所述制备方法由以下步骤组成：制备烧结助剂，制备复合晶须，混料，压制成型，烧结；所述制备烧结助剂，由以下步骤组成：制备混合溶胶，复合，表面改性；所述制备复合晶须，由以下步骤组成：制备氧化铝纳米线凝胶，混合，生长晶须；所述混料，将去离子水、碳化硅粉、烧结助剂、复合晶须、聚乙烯醇1788、聚乙二醇2000、四甲基氢氧化铵混合后进行球磨，喷雾干燥，得到混合粉体；本发明能够提高碳化硅陶瓷的密度、力学性能、断裂韧性的同时，提高碳化硅陶瓷的硬度、高温力学性能、抗热震性，避免在烧结中裂纹的产生。
Preparation method of high-density silicon carbide ceramic
The invention discloses a preparation method of high-density silicon carbide ceramics, and belongs to the technical field of silicon carbide ceramics, the preparation method comprises the following steps: preparing a sintering aid, preparing composite whiskers, mixing materials, carrying out compression molding, and sintering; the preparation of the sintering aid comprises the following steps: preparing mixed sol, compounding and carrying out surface modification. The preparation of the composite whisker comprises the following steps: preparing alumina nanowire gel, mixing, and growing the whisker. The step of material mixing comprises the following steps: mixing deionized water, silicon carbide powder, a sintering aid, composite whiskers, polyvinyl alcohol 1788, polyethylene glycol 2000 and tetramethylammonium hydroxide, and then carrying out ball milling and spray drying to obtain mixed powder; the density, the mechanical property and the fracture toughness of the silicon carbide ceramic can be improved, meanwhile, the hardness, the high-temperature mechanical property and the thermal shock resistance of the silicon carbide ceramic are improved, and cracks are avoided in the sintering process.
本发明公开了一种高密度碳化硅陶瓷的制备方法，属于碳化硅陶瓷技术领域，所述制备方法由以下步骤组成：制备烧结助剂，制备复合晶须，混料，压制成型，烧结；所述制备烧结助剂，由以下步骤组成：制备混合溶胶，复合，表面改性；所述制备复合晶须，由以下步骤组成：制备氧化铝纳米线凝胶，混合，生长晶须；所述混料，将去离子水、碳化硅粉、烧结助剂、复合晶须、聚乙烯醇1788、聚乙二醇2000、四甲基氢氧化铵混合后进行球磨，喷雾干燥，得到混合粉体；本发明能够提高碳化硅陶瓷的密度、力学性能、断裂韧性的同时，提高碳化硅陶瓷的硬度、高温力学性能、抗热震性，避免在烧结中裂纹的产生。
Preparation method of high-density silicon carbide ceramic
一种高密度碳化硅陶瓷的制备方法
WANG YONGHUA (Autor:in) / ZHAO HONGSHUAI (Autor:in)
12.04.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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