论文部分内容阅读
在将纤维预制体视为“毛细管束”基础上 ,采用达西定律建立了离心加速场中金属液浸渗纤维预制体的浸渗动力学模型。采用该模型分析了离心加速场中金属液浸渗纤维预制体的临界转速 ,考察了金属液浇注量、设备转速、铸件高度、金属液原始外半径以及纤维预制体孔隙率对离心加速场中金属液浸渗纤维预制体的影响。结果表明 ,金属液浸渗纤维预制体的临界转速只与临界压力、金属液的浇注量、铸件高度以及纤维预制体性质有关 ;增加金属液浇注量、设备转速及金属液原始外半径 ,降低铸件高度、预制体纤维体积分数 ,有利于金属液的浸渗。
Based on the assumption that the fiber preform is a “capillary bundle”, Darcy’s law was used to establish the infiltration kinetics model of the liquid metal infiltration fiber preform in centrifugal acceleration field. The critical speed of liquid metal infiltration fiber preform in centrifuge accelerating field was analyzed using this model. The effects of pouring amount of liquid metal, equipment rotating speed, casting height, original external radius of liquid metal and porosity of preform were investigated. Influence of liquid infiltration on fiber preform. The results show that the critical speed of molten metal impregnated fiber preform is only related to the critical pressure, the pouring amount of molten metal, the height of castings and the properties of the fiber preform. The pouring amount of molten metal, the rotating speed of equipment and the original outer radius of molten metal are decreased, Height, prefabricated fiber volume fraction, is conducive to infiltration of molten metal.