chapter 3-4 composites.ppt

《Introduction to Materials Science and Engineering》 3 Metallic Materials 3.4 Metallic matrix Composites 3.5 Review of Part I and Part III Lecturer: Dr. WU Bo 2007.11.13 3.4 Outline of Composites Overview Reinforcing materials Principles of composite Application of composites Composites Composites: A three-dimensional combination of at least two chemically distinct materials, with a distinct interface separating the components, created to obtain properties that cannot be achieved by any of the components acting alone Description The reinforcing material and the matrix material can be metal, ceramic, or polymer. Reinforcing materials are strong with low densities while the matrix is usually a ductile, or tough material. （硬质点，软基体） Summary Composites have unique performances used for structural applications, which combining the outstanding properties both the ductile (or toughen) matrix, and harden reinforcing phase. Question and discuss Understanding the structure of interface and reinforce mechanism can promote the composites design and processing. * College of Materials Science and Engineering Fuzhou University Matrix phase+Reinforcing phase 复合材料是由两种或两种以上的组分材料通过适当的制备工艺复合在一起的新材料，其既保留原组分材料的特性，又具有原单一组分材料所无法获得的或更优异的特性。 越王勾践宝剑 吴王矛 古老金属基复合材料的代表，它采用金属包层复合材料，不仅光亮锋利，而且韧性和耐腐蚀性优异。 Ancient metallic-matrix composites 波音787于2007年7月下线 Boeing 787大量采用新型复合材料碳纤维，与传统铝合金客机相比，机身重量减轻，强度提高?省油近两成，废气排放量减少两成、维修成本降低三成 Chance and challenge for Materials people 1st prize of the National Awards for Technical Invention in 2004 “Preparation Technology of High-performance Carbon-Carbon Composite Braking Materials in Aviation” (中南大学） 高性能碳/碳航空刹车材料的制备技术 三维正交碳纤维增强 的C/C的显微结构 C/C作为刹车盘 碳/碳复合材料（C/C）是由碳纤维及其制品（碳毡、碳布等）增强的碳基复合材料。一般C/C是由碳纤维及其制品作为预制体，通过化学气相沉积法（CVD）或液态树脂、沥青浸渍碳化法获得C/C的基体碳来制备的。 　 3.4.4 典型的复合材料及应用 　3.4.4.3 碳纤维增强碳基体(碳/碳, C/C)复合材料　 1st prize of the National Awards for Technical Invention in 2004