摘要
以针刺炭纤维整体毡为预制体,联用化学气相沉积法与熔融渗硅法制得炭纤维增强C/SiC双基体(C/C-SiC)复合材料;研究了C/C-Si材料的显微结构、力学性能和不同制动速度下的摩擦磨损性能及机理。结果表明:C/C-SiC材料具有适中的纤维/基体界面结合强度,弯曲强度和压缩强度分别达240MPa和210MPa,具有摩擦系数高(0.41～0.54),磨损小(0.02cm3/MJ),摩擦性能稳定等特点.随着制动速度提高,C/C-Si材料的摩擦磨损机制也随之变化:在低速制动条件下主要表现为磨粒磨损;中速时以黏着磨损为主;高速时以疲劳磨损和氧化磨损为主。
Carbon fibre-reinforced carbon and silicon carbide dual matrix composites （C/C-SiC） were fabricated by a combination of chemical vapor infiltration with liquid silicon infiltration. The structural characteristics, mechanical per- formance and tribological properties of the C/C-SiC composites and their wear mechanism at different braking speeds were investigated using a QDM150 friction testing machine, SEM and X-ray energy dispersive analysis. Results indicate that the C/C-SiC composites show an increased bonding strength at the fibre/matrix interface, and the value of flexural strength and compressive strength of the C/C-SiC composites can reach 240 and 210 MPa, respectively. The friction co- efficients are between 0.41 and 0.54. Wear rates are not sensitive to the brake speed and remain constant at about 0. 02 cm3/Mj, and the friction coefficient is stable. Frictional films with a thickness of 1-3 txm are formed on the worn surface of the composites upon braking. The wear mechanism changes with increased braking speed, from abrasion at 8m/s, adhesion at 12m/s and 16m/s to fatigue and oxidation at 20m/s and 24m/s, respectively.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2010年第3期225-231,共7页
New Carbon Materials
基金
support for this study provided by the National HiTech Research Development Program of China(2006AA03Z560)
Excellent Youth of Hunan Province,China(06JJ1007)~~
关键词
C/SIC复合材料
摩擦磨损性能
制动材料
化学气相沉积法
熔融渗硅
C/SiC composites
Tribological properties
Braking composites
Chemical vapor infiltration
Liquid silicon infiltration
作者简介
作者介绍：李专（1982-），男，湖南人．博士研究生，主要从事高性能陶瓷基复合材料的研究．E—mail：lizhuan@yahoo．com．cn
通讯作者：肖鹏，教授，博士生导师．Tel：＋86-731-8830131，E-mai：xiaopeng@mailcsu．edu．cn
