Microstructure and tribological characteristics of needled C/C-SiC brake composites fabricated by simultaneous infiltration of molten Si and Cu
Microstructure and tribological characteristics of needled C/C-SiC brake composites fabricated by simultaneous infiltration of molten Si and Cu
复制标题
熔融Si和Cu同时熔渗制备的针刺C/C-SiC制动复合材料的微观结构和摩擦学特性
DOI：
10.1016/j.triboint.2015.08.047
复制
发表时间：
2016
影响因子：
6.2
通讯作者：
Xiao Peng
中科院分区：
文献类型：
--
作者：
Li Zhuan;Liu Yi-zhong;Zhang Ben-gu;Lu Yu-hai;Li Yang;Xiao Peng
为了降低C/C - sic制动复合材料在低制动速度下的磨损率，采用熔融Si和Cu同时渗透的方法制备了Cu合金改性的C/C - sic复合材料。研究了C/C - sic复合材料的摩擦学特性。结果表明，C/C - SiC复合材料主要由C、SiC、Si、Cu3Si和Cu组成。C/C - sic中碳基体（焦碳）的石墨化度为0.642，计算得到C/C - sic的总硬度为1441.6。对Cu合金进行基体改性后，C/C - sic制动复合材料在低制动速度下具有稳定的摩擦系数和较低的磨损率。在制动速度为1500 r/min时，自配C/C - sic和钢配C/C - sic的COF分别为0.17和0.31。相应的磨损率分别为1.18 m side - 1cycle - 1和0.04 m side - 1cycle - 1。由于摩擦表面温度不断升高，Cu与Si完全反应形成Cu3Si。因此，Cu合金有利于在制动过程中降低C/C - sic的硬度。Cu合金改性C/C - sic复合材料的典型制动曲线为马鞍形。
In order to reduce the wear rate of C/C–SiC brake composites at low brake speed, the C/C–SiC composites with Cu alloy modification were fabricated by simultaneous infiltration of molten Si and Cu. The tribological characteristics of C/C–SiC composites mated with self and steel counterparts, respectively, were investigated. The results indicated that the C/C–SiC composites were composed of C, SiC, Si, Cu3Si and Cu. The degree of graphitization of carbon matrix (pyrocarbon) in C/C–SiC was 0.642, and the calculated overall hardness of C/C–SiC was 1441.6. The C/C–SiC brake composites show stable coefficient of friction (COF) and low wear rate under low brake speed for the matrix modification of Cu alloy. The COF of self-mated C/C–SiC and C/C–SiC mated with steel counterpart under the brake speed of 1500 r/min were 0.17 and 0.31, respectively. The corresponding wear rates were 1.18 m side−1cycle−1and 0.04 m side−1cycle−1respectively. Due to the temperature of friction surface increased constantly, the Cu reacted with Si entirely and formed Cu3Si. Therefore, the Cu alloy in favor of diminishing the hardness of C/C–SiC during the brake process. The typical brake curves of C/C–SiC composites with Cu alloy modification were in the shape of horse saddle.