论文部分内容阅读
通过在模具内表面涂覆较厚陶瓷保温层,利用挤压铸造成功制备了Al2O3颗粒增强钢基复合材料。利用陶瓷保温层对钢液进行控温处理,解决了钢基复合材料挤压铸造时因钢液冷却速度快、浸渗能力差,导致复合材料制备困难等问题。在8MPa的挤压力下,成功地制备了6mm厚、Al2O3的体积分数为56%的Al2O3p/40Cr表层复合材料。结果表明,所制备的复合材料组织致密、晶粒细小;基材和复合材料层间的宏观界面过渡自然、连续性好,颗粒和基体间的微观界面结合紧密;复合层比40Cr基材的耐磨性提高了8.7倍。
By coating the inner surface of the mold with a thick ceramic thermal insulation layer, Al2O3 particle reinforced steel matrix composites were successfully prepared by extrusion casting. The use of ceramic insulation layer for liquid steel temperature control, to solve the steel-based composite material squeeze casting due to the liquid steel cooling speed, poor infiltration capacity, resulting in difficult preparation of composite materials and other issues. Under the pressure of 8MPa, a 6mm thick Al2O3p / 40Cr composite with a volume fraction of 56% was successfully prepared. The results show that the prepared composite has dense microstructure and small grain size; the macroscopic interface between the substrate and the composite material has a natural transition and good continuity; and the microscopic interface between the particles and the substrate is tightly bonded; Grindability increased by 8.7 times.