TRIBOROGICAL PROPERTIES OF CARBON TYPE COMPOSITES WITH FRICTION-MODIFYING FUNCTION

研究了碳基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。特别是以COPNA（Condensed Polynucleus Aromatic Resin）为原料，在500 ℃左右热固化制备的碳前驱体（Carbon Precursor），作为介于有机物和无机物之间的中间材料，受到了广泛的关注。以对甲苯磺酸为催化剂，以芴和对苯二甲酚为原料合成了COPNA树脂。通过IR、TGA、GC-MS等分析手段，对210 ℃固化树脂和500 ℃左右固化产物进行了分析，研究了聚合过程和初始碳化过程。(A)颗粒混合复合材料（无孔材料）由上述芴基COPNA树脂（FC）和填充有0-40质量%石墨的市售沥青基COPNA树脂（5 K）复合材料制备两个系列的平坦测试样品。它们的润滑性能，如 ...更多信息 在圆柱/平板摩擦试验机上研究了摩擦系数随载荷、滑动速度和温度的变化规律，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（μ）减小：FC复合材料的最小μ =0.04，SK复合材料的最小μ =0.03。(2)PC和SK复合材料的极限PV值都比其它材料高，为10 ~ 20 MPa m/s。（3）FC复合材料的摩擦系数在300 ℃左右随温度的升高而急剧增加，而SiC制品的摩擦系数在550 ℃以下仍保持较低的值，μ <0.05。(4)在良好的润滑条件下，摩擦表面上观察到一些非常薄的改性石墨膜。这表明它有望成为一种低摩擦的轴承材料。然而，在油润滑下，由于与油的相容性较差，因此该复合材料表现出更高的摩擦和过度磨损。(B)纤维增强复合材料（多孔材料）平板试样由碳纤维纸和COPNA树脂制备。在无润滑和有油润滑条件下，用摩擦磨损试验机研究了它们的摩擦性能，如摩擦系数与载荷、滑动速度和温度的关系，发现在无油润滑条件下，固化和固化复合材料的摩擦系数随载荷、速度和温度的变化都很大。特别是，与固化复合材料相比，固化复合材料具有更高和更稳定的摩擦性能，但缺点是机械强度相对于耐磨性较小。

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