Pienti L, Sciti D, Silvestroni L, Guicciardi S
CNR-ISTEC, National Research Council of Italy-Institute of Science and Technology for Ceramics, Via Granarolo 64, I-48018 Faenza, Italy.
Materials (Basel). 2013 May 15;6(5):1980-1993. doi: 10.3390/ma6051980.
This work aims at studying the effect of the milling conditions on the microstructure and mechanical properties of a ZrB₂-5 vol% Si₃N₄ matrix reinforced with chopped Hi-Nicalon SiC fibers. Several composites were obtained using different milling conditions in terms of time, speed and type of milling media. The composites were prepared from commercial powders, ball milled, dried and shaped, and hot pressed at 1720 °C. Their relative bulk densities achieved values as high as 99%. For each material the fiber length distribution, the extent of reacted fiber area and matrix mean grain size were evaluated in order to ascertain the effects of milling time, milling speed and type of milling media. While the fracture toughness and hardness were statistically the same independently of the milling conditions, the flexural strength changed. From the results obtained, the best milling conditions for optimized mechanical properties were determined.
本工作旨在研究球磨条件对短切Hi-Nicalon SiC纤维增强ZrB₂-5 vol% Si₃N₄基复合材料微观结构和力学性能的影响。采用不同的球磨时间、速度和球磨介质类型，制备了几种复合材料。这些复合材料由商业粉末制备，经过球磨、干燥、成型，并在1720℃下热压。它们的相对体积密度高达99%。为了确定球磨时间、球磨速度和球磨介质类型的影响，对每种材料的纤维长度分布、反应纤维面积程度和基体平均晶粒尺寸进行了评估。虽然断裂韧性和硬度在统计学上与球磨条件无关，但弯曲强度发生了变化。根据所得结果，确定了优化力学性能的最佳球磨条件。
