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采用高能球磨粉末冶金法制备了Si C/Al复合材料,在氩气气氛保护下配比Si C体积分数分别为10%、14%、18%、22%的粉末,然后以200 r/min的球磨速度混料3 h,以3.5 MPa冷等静压30 min,最后在氩气气氛下烧结,以5℃/min的升温速率升至640℃,在该温度条件下保温2 h,在氩气气氛下自然冷却制备。可求出试样的致密度;研究球磨对复合材料X射线衍射图谱及SiC体积分数对显微组织及硬度的影响。结果表明,通过高能球磨法制备SiC/Al复合材料,其致密度可达94.8%,而硬度达62.9HB,比纯铝的29 HB提高了217%。
The Si C / Al composites were prepared by high-energy ball milling and powder metallurgy. The Si C / Al composites were prepared with 10%, 14%, 18% and 22% The ball mill speed mixing 3 h, 3.5 MPa cold isostatic pressing 30 min, and finally sintered in an argon atmosphere at a heating rate of 5 ℃ / min rose to 640 ℃, incubated at this temperature for 2 h, under argon Natural cooling to prepare the atmosphere. The density of the sample can be obtained. The effect of ball milling on the microstructure and hardness of the composite was investigated by X-ray diffraction and SiC volume fraction. The results show that the mechanical properties of SiC / Al composites prepared by high energy ball milling are 94.8% and 62.9HB, respectively, which is 217% higher than that of pure aluminum.