Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Blocky titanium carbide-silicon carbide composite aerogel material and preparation method thereof
The invention relates to a blocky silicon carbide-titanium carbide composite aerogel material and a preparation method thereof. The form of the material is a grey black block, and the material is composed of titanium carbide and silicon carbide. The preparation method comprises steps: preparing wet gel by respectively adding an acid catalyst through a one-step sol-gel process, subjecting the wet gel to solvent replacement and supercritical drying to obtain an RF/SiO2/TiO2 composite aerogel precursor, and preparing the blocky TiC/SiC composite porous aerogel material by controlling high-temperature carbon thermal reduction and calcination carbon removal in an inert atmosphere. By introducing the porous structure, the lightweight requirement is met, the operation temperature is greatly reduced, a block material can be prepared, and the application range is wider. A sol-gel process is adopted, the size of reaction particles is smaller, the contact area among the particles is large, materials can be uniformly mixed in subsequent heat treatment, the reaction is more thorough, carbon generated by pyrolysis of organic aerogel (RF aerogel) is used for carrying out a carbothermal reductionreaction, a carbon reducing agent does not need to be additionally added, and the operability and controllability of the process are realized on the molecular level.
本发明涉及一种块状碳化硅‑碳化钛复合气凝胶材料及其制备方法。其形态为灰黑色块体，成分为碳化钛和碳化硅。通过分别加入酸催化剂一步溶胶‑凝胶工艺制备湿凝胶，湿凝胶经过溶剂置换和超临界干燥得到RF/SiO2/TiO2复合气凝胶前驱体，在通过惰性气氛控制高温碳热还原及煅烧除炭制得块状TiC/SiC复合多孔气凝胶材料。本发明通过引入多孔结构达到轻质要求，操作温度大幅度降低，且可以制备成块体材料，应用范围更广。采用溶胶‑凝胶工艺，反应颗粒尺寸更小，颗粒之间的接触面积大，在后续热处理中材料能够均匀混合，反应更加彻底，且利用有机气凝胶(RF气凝胶)热解自生成的碳进行碳热还原反应，无需额外添加碳还原剂，在分子水平上实现了工艺的可操作性和可控性。
Blocky titanium carbide-silicon carbide composite aerogel material and preparation method thereof
The invention relates to a blocky silicon carbide-titanium carbide composite aerogel material and a preparation method thereof. The form of the material is a grey black block, and the material is composed of titanium carbide and silicon carbide. The preparation method comprises steps: preparing wet gel by respectively adding an acid catalyst through a one-step sol-gel process, subjecting the wet gel to solvent replacement and supercritical drying to obtain an RF/SiO2/TiO2 composite aerogel precursor, and preparing the blocky TiC/SiC composite porous aerogel material by controlling high-temperature carbon thermal reduction and calcination carbon removal in an inert atmosphere. By introducing the porous structure, the lightweight requirement is met, the operation temperature is greatly reduced, a block material can be prepared, and the application range is wider. A sol-gel process is adopted, the size of reaction particles is smaller, the contact area among the particles is large, materials can be uniformly mixed in subsequent heat treatment, the reaction is more thorough, carbon generated by pyrolysis of organic aerogel (RF aerogel) is used for carrying out a carbothermal reductionreaction, a carbon reducing agent does not need to be additionally added, and the operability and controllability of the process are realized on the molecular level.
本发明涉及一种块状碳化硅‑碳化钛复合气凝胶材料及其制备方法。其形态为灰黑色块体，成分为碳化钛和碳化硅。通过分别加入酸催化剂一步溶胶‑凝胶工艺制备湿凝胶，湿凝胶经过溶剂置换和超临界干燥得到RF/SiO2/TiO2复合气凝胶前驱体，在通过惰性气氛控制高温碳热还原及煅烧除炭制得块状TiC/SiC复合多孔气凝胶材料。本发明通过引入多孔结构达到轻质要求，操作温度大幅度降低，且可以制备成块体材料，应用范围更广。采用溶胶‑凝胶工艺，反应颗粒尺寸更小，颗粒之间的接触面积大，在后续热处理中材料能够均匀混合，反应更加彻底，且利用有机气凝胶(RF气凝胶)热解自生成的碳进行碳热还原反应，无需额外添加碳还原剂，在分子水平上实现了工艺的可操作性和可控性。
Blocky titanium carbide-silicon carbide composite aerogel material and preparation method thereof
一种块状碳化钛-碳化硅复合气凝胶材料及其制备方法
TANG JINQIONG (Autor:in) / REN JIAN (Autor:in) / ZHAO ZHIYANG (Autor:in) / KONG YONG (Autor:in) / SHEN XIAODONG (Autor:in)
26.02.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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