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Preparation method and application of carbon fiber/silicon carbide oriented porous skeleton
The invention discloses a preparation method and application of a carbon fiber/silicon carbide composite porous skeleton with a directional heat conduction characteristic, and relates to the following steps: firstly, uniformly mixing silicon and silicon dioxide powder raw materials, then uniformly dispersing the silicon source mixture and a carbon fiber raw material in a binder solution, and obtaining a three-dimensional skeleton blank with an oriented porous structure through pre-freezing, freeze forming and vacuum freeze drying treatment, wherein the forming principle is that the orientation direction of the skeleton is regulated and controlled by utilizing the effect of an oriented ice template method to prepare the three-dimensional oriented ordered porous skeleton; and finally, carrying out high-temperature calcination treatment in an inert atmosphere, and generating silicon carbide by utilizing a carbon thermal reduction reaction, so as to prepare the carbon fiber/silicon carbide composite porous skeleton with the directional heat conduction characteristic. The prepared composite porous framework body can be used as a heat conduction filler to be applied to a phase change heat storage material and a thermal interface material, the heat conductivity coefficient of a compound is improved, and the characteristic of oriented heat conduction is achieved. The method is simple in preparation process, low in cost and wide in application.
本发明公开了一种具有定向导热特性的碳纤维/碳化硅复合多孔骨架的制备方法及应用，涉及以下步骤：首先，将硅与二氧化硅粉体原料混合均匀，之后将该硅源混合物与碳纤维原料均匀地分散在粘结剂溶液中，经预冷冻、冷冻成型、真空冷冻干燥处理得到具有定向多孔结构的三维骨架胚体，其成型原理是利用定向冰模板法的作用调控骨架的取向方向制成三维定向有序多孔骨架。最后在惰性气氛下进行高温煅烧处理，利用碳热还原反应生成碳化硅，制得具有定向导热特性的碳纤维/碳化硅复合多孔骨架。制得的复合多孔骨架体可作为导热填料应用于相变储热材料与热界面材料中，提高复合物的导热系数且具有取向性导热的特点。本发明制备过程简单，成本低，应用广泛。
Preparation method and application of carbon fiber/silicon carbide oriented porous skeleton
The invention discloses a preparation method and application of a carbon fiber/silicon carbide composite porous skeleton with a directional heat conduction characteristic, and relates to the following steps: firstly, uniformly mixing silicon and silicon dioxide powder raw materials, then uniformly dispersing the silicon source mixture and a carbon fiber raw material in a binder solution, and obtaining a three-dimensional skeleton blank with an oriented porous structure through pre-freezing, freeze forming and vacuum freeze drying treatment, wherein the forming principle is that the orientation direction of the skeleton is regulated and controlled by utilizing the effect of an oriented ice template method to prepare the three-dimensional oriented ordered porous skeleton; and finally, carrying out high-temperature calcination treatment in an inert atmosphere, and generating silicon carbide by utilizing a carbon thermal reduction reaction, so as to prepare the carbon fiber/silicon carbide composite porous skeleton with the directional heat conduction characteristic. The prepared composite porous framework body can be used as a heat conduction filler to be applied to a phase change heat storage material and a thermal interface material, the heat conductivity coefficient of a compound is improved, and the characteristic of oriented heat conduction is achieved. The method is simple in preparation process, low in cost and wide in application.
本发明公开了一种具有定向导热特性的碳纤维/碳化硅复合多孔骨架的制备方法及应用，涉及以下步骤：首先，将硅与二氧化硅粉体原料混合均匀，之后将该硅源混合物与碳纤维原料均匀地分散在粘结剂溶液中，经预冷冻、冷冻成型、真空冷冻干燥处理得到具有定向多孔结构的三维骨架胚体，其成型原理是利用定向冰模板法的作用调控骨架的取向方向制成三维定向有序多孔骨架。最后在惰性气氛下进行高温煅烧处理，利用碳热还原反应生成碳化硅，制得具有定向导热特性的碳纤维/碳化硅复合多孔骨架。制得的复合多孔骨架体可作为导热填料应用于相变储热材料与热界面材料中，提高复合物的导热系数且具有取向性导热的特点。本发明制备过程简单，成本低，应用广泛。
Preparation method and application of carbon fiber/silicon carbide oriented porous skeleton
一种碳纤维/碳化硅定向多孔骨架的制备方法及应用
ZHU CHUNYU (author) / ZHAO CHENGZHI (author) / SHENG NAN (author) / RAO ZHONGHAO (author)
2021-12-07
Patent
Electronic Resource
Chinese
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