44.6晶须:VLS法 45界面 Interface 3C+ SiO Sic+2C0 The behavior of a composite material is a result of the combined behavior of the 固体Si following three entitie 催化剂 过饱和Sj与C Fiber or the reinforcing element Fiber/matrix interface Wettability Important types of interfacial bonding Complete Wetting=0° ☆ Mechanical bonding Vapor ☆ Physical bonding ☆ Chemical bonding Partial Wetting Mechanical bonding Physical Bonding Fiber der Waals forces, dipolar interactions, and (a)Good mechanical bondi hydrogen bonding can be classified as physical11 4.4.6 晶须：VLS法 液体催化剂含 过饱和Si与C 固体SiC 30µ的固体 晶须 催化剂 1400°C H2 CH4 SiO2 3C + SiO2 SiC + 2CO The behavior of a composite material is a result of the combined behavior of the following three entities: ™Fiber or the reinforcing element ™Matrix ™Fiber/matrix interface 4.5 界面 Interface Solid Wettability Liquid Solid Complete Wetting θ = 0° Vapor Liquid No Wetting θ = 180° Vapor γLV γSV γ θ LS Solid Liquid Partial Wetting Important types of interfacial bonding ™ Mechanical bonding ™ Physical bonding ™ Chemical bonding Mechanical bonding (a) Good mechanical bonding Void Matrix Fiber Matrix Fiber (b)Lack of wettability Any bonding involving weak, secondary or van der Waals forces, dipolar interactions, and hydrogen bonding can be classified as physical bonding. The bond energy in such physical bonding is approximately 8-16 kJ/mol. Physical Bonding