共查询到16条相似文献,搜索用时 296 毫秒
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碳/碳复合材料在高能刹车副中的应用 总被引:5,自引:0,他引:5
碳/碳材料是碳基体用碳纤维增强的复合材料,它具有良好的韧性、导热性和导电性能,耐腐蚀、耐磨蚀性好,大量应用在飞机高能刹车副作热库材料,本文介绍了C/C复合材料用作高能刹车热库时,较钢、铍等金属材料有优势。还介绍了C/C材料的有关制造方法和抗氧化工艺等。 相似文献
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高温处理对碳/碳复合材料摩擦学性能影响 总被引:11,自引:0,他引:11
研究了高温处理对化学气相沉积碳/碳(简称C/C)复合材料摩擦磨损性能的影响,分析了经过不同温度处理的试样的刹车力矩-刹车时间曲线.结果表明:随着处理温度的升高,C/C复合材料的干态平均动摩擦系数由大变小,湿态平均动摩擦系数及干态平均静摩擦系数由小变大.经过2500℃处理的C/C材料,不仅刹车过程平稳,湿态平均动摩擦系数衰减少,而且磨损率小.当刹车比压和能载增加时,经过不同温度处理的四种试样干态及湿态平均动摩擦系数均相应下降. 相似文献
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炭/炭复合航空刹车材料的结构完整性对摩擦系数的影响 总被引:14,自引:4,他引:10
炭/炭复合材料(C/C)为类石墨结构,其石墨化程度部分表征了材料的结构完整程度。通过验证C/C材料的石墨化程度对刹车副的刹车力矩特性及刹车过程中摩擦系数的影响,探讨了C/C摩擦材料的摩擦磨损机理。C/C材料晶体的棱、缘、角部的活化点影响材料的物理吸附和化学吸附性能,降低了飞机刹车前几秒钟内的摩擦系数;材料内部的碳氧络合物的多少则影响到刹车副体积温度为400℃-500℃时摩擦系数的大小。这二者的共同作用劣化了刹车副的制动性能。 相似文献
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确定了一种碳/碳(简称C/C)复合材料飞机刹车盘再生利用新技术,通过对再生后样品力学性能测试和SEM分析表明其层间剪切强度比未再生前高,层间破坏未发生在粘接面上。研制出了与再生炭盘相匹配的防氧化涂层,实验表明这种涂层具有良好的氧化防护性能。地面动力模拟试验证明这种技术安全可靠,用其再生的炭盘满足飞机使用要求。 相似文献
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Carbon fibre reinforced carbon and SiC dual matrices composites (C/C-SiC) show superior tribological properties, high thermal shock resistance and good abrasive resistance, and they are promising candidates for advanced brake and clutch systems. The microstructure, mechanical properties, friction and wear properties, and application of the C/C-SiC composites fabricated by warm compacted-in situ reaction were introduced. The results indicated that the composites were composed of 50-60 wt pct carbon, 2-10 wt pct residual silicon and 30-40 wt pct silicon carbide. The C/C-SiC brake composites exhibited good mechanical properties. The value of flexural strength and compressive strength could reach 160 and 112 MPa, respectively. The impact strength was about 2.5 kJ·m-2. The C/C-SiC brake composites showed excellent tribological performance,
including high coefficient of friction (0.38), good abrasive resistance (1.10 μm/cycle) and brake steadily on dry condition. The tribological properties on wet condition could be mostly maintained. The silicon carbide matrix in C/C-SiC brake composites improved the wear resistance, and the graphite played the lubrication function, and right volume content of graphite was helpful to forming friction film to reduce the wear rate. These results showed that C/C-SiC composites fabricated by warm compacted-in situ reaction had excellent properties for use as brake materials. 相似文献
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碳/碳复合材料在航空领域的应用研究现状 总被引:42,自引:2,他引:40
介绍了碳/碳复合材料在飞机刹车装置及航空发动机热端部件方面应用,研究的国内外状况,论述了目前研究中存在的总是及今后的研究发展方向。 相似文献
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以丙烯为碳源, FeCl3·6H2O为催化剂, 采用化学气相沉积法(CVD)在碳毡和不同密度的C/C复合材料上原位气相生长碳纤维(VGCFs) , 并以含原位生长VGCFs的碳毡和不同密度的C/C复合材料为基体制备VGCFs-C/C复合材料。研究了反应压力、基体密度对VGCFs生长情况的影响, 借助扫描电镜(SEM)、光学显微镜观察原位生长VGCFs的形貌及基体原位生长VGCFs后热解炭形貌的变化, 并对比研究了C/C复合材料和VGCFs-C/C复合材料的弯曲性能。研究结果表明, 反应压力为3700 Pa, 基体密度低的情况更有利于VGCFs的生长; 原位生长的VGCFs改变了纤维表面热解炭的沉积形貌, 使得热解炭和碳纤维的结合面之间形成具有铆钉作用的球状结构, 增强了界面结合力, 从而提高了原位生长的高VGCFs含量样品的弯曲强度。 相似文献
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J. Rosenlöcher G. Deinzer R. Waninger J. Münchhoff 《Materialwissenschaft und Werkstofftechnik》2007,38(11):922-926
High performance brake discs made of fiber reinforced ceramics The Audi AG is one of the worldwide leading car manufacturers of the premium class. One of the main aims of the technical development department at Audi is the use of novel and innovative materials. The Audi AG has intensively worked on the development and introduction of ceramic brake discs for several car types. These brake discs are made of a short carbon fiber reinforced silicon carbide ceramic, a so called CMC‐material (ceramic matrix composite). This material is produced in a very complex process by silicon melt infiltration of carbon preforms. The advantages of these innovative and powerful brake discs out of C/SiC‐ceramic are the low weight and thus the reduction of the unsprung rotating masses, the low wear rate during completed service life, the temperature and fading stability and the corrosion resistance. The complete braking system and its periphery had to be reengineered and adjusted because of the specific material properties. 相似文献