Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Low-shrinkage mullite-based porous ceramic and preparation method thereof
The invention provides low-shrinkage mullite-based porous ceramic and a preparation method thereof, and relates to the technical field of preparation of inorganic non-metallic materials. Specific mineral powder (one of andalusite, kyanite and sillimanite) is used as a raw material, a foaming-gel injection molding method is adopted, sintering shrinkage is counteracted by utilizing a volume expansion effect generated by phase transformation of the raw material at a high temperature, and an aluminum-containing additive also has volume expansion in a sintering process to further counteract sintering shrinkage, so that the sintering shrinkage is further counteracted, and the sintering shrinkage is further counteracted. In addition, the added aluminum-containing additive reacts with silicon dioxide precipitated through phase transformation to generate mullite whiskers to enhance the mechanical property, so that the low-shrinkage mullite-based porous ceramic is obtained, and the requirements of preparing porous ceramic parts with complex shapes, reducing the processing cost and the like are met. The result of the embodiment shows that the shrinkage rate of the prepared low-shrinkage mullite-based porous ceramic is only 0-5%, the porosity is 75-95%, and the compressive strength is 2-30 MPa.
本发明提供了一种低收缩莫来石基多孔陶瓷及其制备方法，涉及无机非金属材料制备技术领域。本发明以特定的矿物粉料(红柱石、蓝晶石和硅线石中的一种)作为原料，采用发泡‑凝胶注模法，利用原料在高温下的相转变产生的体积膨胀效应来抵消烧结收缩，而且含铝的添加剂在烧结过程中也会发生体积膨胀进一步抵消烧结收缩，此外，加入的含铝添加剂与相转变析出的二氧化硅反应会生成莫来石晶须增强力学性能，进而得到了低收缩莫来石基多孔陶瓷，以满足制备形状复杂的多孔陶瓷部件和降低加工成本等需要。实施例的结果表明，本发明制备的低收缩莫来石基多孔陶瓷收缩率仅为0～5％，孔隙率为75～95％，抗压强度为2～30MPa。
Low-shrinkage mullite-based porous ceramic and preparation method thereof
The invention provides low-shrinkage mullite-based porous ceramic and a preparation method thereof, and relates to the technical field of preparation of inorganic non-metallic materials. Specific mineral powder (one of andalusite, kyanite and sillimanite) is used as a raw material, a foaming-gel injection molding method is adopted, sintering shrinkage is counteracted by utilizing a volume expansion effect generated by phase transformation of the raw material at a high temperature, and an aluminum-containing additive also has volume expansion in a sintering process to further counteract sintering shrinkage, so that the sintering shrinkage is further counteracted, and the sintering shrinkage is further counteracted. In addition, the added aluminum-containing additive reacts with silicon dioxide precipitated through phase transformation to generate mullite whiskers to enhance the mechanical property, so that the low-shrinkage mullite-based porous ceramic is obtained, and the requirements of preparing porous ceramic parts with complex shapes, reducing the processing cost and the like are met. The result of the embodiment shows that the shrinkage rate of the prepared low-shrinkage mullite-based porous ceramic is only 0-5%, the porosity is 75-95%, and the compressive strength is 2-30 MPa.
本发明提供了一种低收缩莫来石基多孔陶瓷及其制备方法，涉及无机非金属材料制备技术领域。本发明以特定的矿物粉料(红柱石、蓝晶石和硅线石中的一种)作为原料，采用发泡‑凝胶注模法，利用原料在高温下的相转变产生的体积膨胀效应来抵消烧结收缩，而且含铝的添加剂在烧结过程中也会发生体积膨胀进一步抵消烧结收缩，此外，加入的含铝添加剂与相转变析出的二氧化硅反应会生成莫来石晶须增强力学性能，进而得到了低收缩莫来石基多孔陶瓷，以满足制备形状复杂的多孔陶瓷部件和降低加工成本等需要。实施例的结果表明，本发明制备的低收缩莫来石基多孔陶瓷收缩率仅为0～5％，孔隙率为75～95％，抗压强度为2～30MPa。
Low-shrinkage mullite-based porous ceramic and preparation method thereof
一种低收缩莫来石基多孔陶瓷及其制备方法
XU JIE (Autor:in) / LIN LANG (Autor:in) / XIA CHENHE (Autor:in) / WANG HENGCHANG (Autor:in) / YANG RUNWU (Autor:in) / WEI MINGYUE (Autor:in) / GAO FENG (Autor:in)
25.10.2022
Patent
Elektronische Ressource
Chinesisch
Alumina/mullite composite porous ceramic and preparation method thereof
| Europäisches Patentamt | 2023
Preparation method of mullite fiber-based porous ceramic
| Europäisches Patentamt | 2022
Preparation method of gradient porous mullite ceramic
| Europäisches Patentamt | 2016
Mullite-whisker-reinforced anorthite porous ceramic and preparation method thereof
| Europäisches Patentamt | 2015