TRIBOROGICAL PROPERTIES OF CARBON TYPE COMPOSITES WITH FRICTION-MODIFYING FUNCTION

介绍了碳型复合材料颗粒混合复合材料(A)和纤维增强复合材料(B)的摩擦学特性。尤其是由热固性树脂COPNA(缩合多核芳香树脂)在500ﾟ℃左右制备的炭化产物，即所谓的碳前驱体，是介于有机物质和无机物质之间的中间物质。以对甲苯磺酸为催化剂，荧烯(稠合多环烃)和1，4-苯二甲酚为原料合成了COPNA树脂。采用红外光谱、热重分析、GC-MS等分析手段，研究了在210ﾟC下固化的树脂和500ﾟC左右的炭化产物的聚合过程和初始炭化过程。(A)颗粒混合复合材料(无孔材料)：用上述材料和商品沥青基树脂(5K)填充质量分数为0~40%的石墨制备了两个系列的平板试件。它们的润滑性能，如…利用圆柱体/板式摩擦试验机，研究了摩擦系数与载荷、滑动速度和温度的关系。主要结果如下：(1)随着石墨填充量的增加，复合材料的承载能力增加，摩擦系数减小。对于FC复合材料和mm，Mu=0.04。对于SK复合材料，Mu=0.03。(2)PC和SK复合材料均具有较高的极限PV值，为10~20 Mpa m/S。(3)随着温度的升高，FC复合材料的摩擦力在300ﾟC左右急剧增加，而碳化产物的摩擦力保持在一个较低的值，最高可达550ﾟC。(4)在良好的润滑条件下，摩擦表面可以观察到一些非常薄的改性石墨薄膜。这表明它有望成为一种低摩擦的轴承材料。然而，在油润滑条件下，碳化后的复合材料由于与油的相容性较差而表现出较高的摩擦和过度磨损。(B)以碳纤维纸和COPNA树脂为原料制备了纤维增强复合材料(多孔材料)平板试件。在无润滑和油润滑条件下，研究了它们的摩擦系数与载荷、滑动速度和温度的关系等摩擦性能。特别是，碳化复合材料具有比固化复合材料更高、更稳定的摩擦性能，但薄弱之处是机械强度较低，抗磨性能较差

This study describes tribological characteristics of carbon-type composite materials particle mixed composite (A) and fiber reinforced composite (B). Especially, carbonized products, so-called Carbon Precursor, which prepared from thermosetting resin named COPNA (Condensed Polynucleus Aromatic Resin) at about 500ﾟC were payid attention to intermediate materials between organic and inorganic substances. The COPNA resin were prepared from Fluorene(fused polycyclic hydrocarbon) and 1,4-benzendimethaaol with p-toluenesulfonic acid as a catalyst. The cured resin at 210ﾟC and the carbonized product at about 500ﾟC were analysed by IR, TGA, GC-MS to study the polymerization process and initial carbonization process.(A) Particle mixed composite (non-porous material)Two series of flat testing specimens were prepared from Fluorene-based COPNA resin(FC), above-mentioned, and commercial pitch-based COPNA resin (5K) composites filled with 0-40 mass% graphite. Their lubricating properties such as the … More dependence of friction coefficient on load, sliding speed and temperature, were evaluated, using a cylinder/plate type tribometer.Main results are as follow. (1) The load carrying capacity increases and the friction coefficient(mu) decreases with graphite filled content : min. mu=0.04 for FC composite and mm. mu =0.03 for SK composite. (2) Both PC and SK composites give higher limitting PV values, l0-20 MPa m/s, than others reported. (3)The friction of the FC composite increases abruptly at about 300ﾟC during increasing of temperature, but that of the carbonized product holds with a lower value, mu <0.05, up to 550ﾟC.(4) Some very thin films with modified graphite on the rubbing surfaces are observed in good lubrication conditions. This indicates it is expectable to be a bearing material of lower friction. Under oil lubrication, however, the carbonized composite showed higher friction and excessive wear because of less compatibility against oil.(B) Fiber reinforced composite (porous material)Flat testing specimens were prepared from carbon fiber paper and COPNA resin . Their friction behaviors such as the dependence of friction coefficient on load, sliding speed and temperature, were evaluated, under non-lubrication and oil lubrication condition , using above- mentioned tribometer.Both cured and carbonized composites showed great friction change with load, speed, and temperature under non-lubrication condition. Especially, the carbonized composite has higher and more stable friction properties than the cured composite, but the weak point was less mechanical strength in relation to anti-wear property Less