Aluminum-based silicon carbide composite material and preparation method thereof: Fid-Bau Portal

Aluminum-based silicon carbide composite material and preparation method thereof

YAN CHUNZE / WANG CHANGSHUN / LIU GUIZHOU / YANG XIAO / SHI YUSHENG

The invention belongs to the related technical field of aluminum-based silicon carbide composite materials, and discloses an aluminum-based silicon carbide composite material and a preparation method thereof, and the preparation method comprises the following steps: (1) curing a silicon carbide composite material green body to obtain a porous silicon carbide/carbon green body; (2) carrying out reactive sintering on the porous silicon carbide/carbon green body; (3) carrying out silicon carbide densification treatment on the porous silicon carbide green body to enable the porosity of the porous silicon carbide green body to be within a preset range so as to obtain a porous silicon carbide preform; (4) performing sol-gel interface modification on the porous silicon carbide preform; and (5) the modified porous silicon carbide prefabricated body is subjected to aluminum alloy infiltration, pores in the porous silicon carbide prefabricated body are filled with aluminum alloy liquid, and the aluminum-based silicon carbide composite material with the preset aluminum alloy volume fraction is obtained. The aluminum-based silicon carbide component with the adjustable silicon carbide-aluminum volume fraction, the controllable structural complexity and the size meeting the requirement can be obtained through the method, and wide application prospects are achieved.

本发明属于铝基碳化硅复合材料相关技术领域，其公开了一种铝基碳化硅复合材料及其制备方法，步骤如下：(1)将碳化硅复合材料坯体进行固化，以获得多孔碳化硅/碳坯体；(2)将多孔碳化硅/碳坯体进行反应烧结；(3)将多孔碳化硅坯体进行碳化硅增密处理，使得多孔碳化硅坯体的孔隙率在预定范围内，以获得多孔碳化硅预制体；(4)将多孔碳化硅预制体进行溶胶凝胶界面改性；(5)将改性后的多孔碳化硅预制体进行铝合金浸渗，多孔碳化硅预制体内部的孔隙被铝合金液填充，以获得预定铝合金体积分数的铝基碳化硅复合材料。通过此方法可以获得碳化硅‑铝体积分数可调、结构复杂度可控、尺寸大小符合需求的铝基碳化硅构件，具有广泛的应用前景。

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