摘要
以二维平纹编织叠层炭纤维坯体(2D)、二维无纬布/炭毡混合叠层针刺毡坯体(2DN)、三维正交编织炭纤维坯体(3D)为预制体,采用化学气相渗透结合树脂浸渍炭化技术进行增密,制备了4种C/C复合材料.在室温干态条件下测试4种C/C复合材料与表面镀Cr的40Cr钢配副时的滑动摩擦行为.结果表明:在试验载荷下,采用2D坯体增强的C/C复合材料摩擦系数最高;随载荷增加,其摩擦系数和磨损体积的波动幅度最大,分别为0.17和1.22mm3;采用2DN坯体的2种C/C复合材料摩擦系数较低,在0.13～0.17之间,且随时间延长呈下降趋势;其余2种坯体的C/C复合材料摩擦系数则上升.4种材料摩擦系数的波动幅度均逐渐降低.SEM观察表明:采用2D坯体C/C复合材料在低载荷下的摩擦表面粗糙,充满磨屑,高载荷下能形成了较松散的摩擦膜.而采用2DN、3D坯体的C/C复合材料摩擦表面部分形成了较完整、致密的摩擦膜,部分呈现显著的纤维磨损和摩擦膜大块剥落形貌.
Four types of C/C composites were prepared using 2 -dimension plain woven and piled fabric （2 -D）, 2 - dimensional needled carbon fibric （2 - DN） and 3 - dimensional woven carbon fiberic （3 - D） as performs, which were densified by a combination of chemical vapor infiltration with impregnation and carbonization of furan resin. The dry sliding friction and wear of the four composites against 40Cr steel coated by Cr were investigated on a M2000 wear tester at room temperature. The results showed that the composite reinforced by 2 - D had the highest coefficient of friction （COF）. , The fluctuation of COF and wear volume increased with increasing load and the maximum values were 0. 17 and 1.22 mm^3, respectively. The two composites with 2 - DN had low COF which fluctuated between 0. 13 - 0. 17. The COFs of the composite with 2 - DN decreased with sliding time while the composites with 2 - D and 3 - D increased. The COF of the four composites became steady with time. SEM observations showed that the worn surface of the composite with 2 - D was very rough at low load but it had compacted film at high loads. On the worn surfaces of the composites with 2 - DN and 3 - D, the coexistence of compacted and integrated film, large worn fiber and peeled film were found.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2010年第1期19-25,共7页
Tribology
