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根据汽车、摩托车筒式减震器的工作原理,在筒式减震器中,减震液是实现阻尼、减震的主体。只有贮油缸和工作缸中的减震液,在不断地压缩、复原循环中保持恒定的数量,才能实现减震功能的可项目指标硬度(邵尔A)/度8055断裂强度/MPa>12扯断伸长率/%>200100%定伸应力/MPa>6磨耗量(DIN53516)<200耐寒性(-40℃×22h)不得有裂纹120℃×94h热空气老化后硬度(邵尔A)变化/度0~5断裂强度变化率/%0~6扯断伸长率变化率/%-10~0100℃×94h减震器油浸泡后硬度(邵尔A)变化/… 相似文献
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汽车前减震器用于汽车前桥与车身之间的减震。本工作探讨汽车前减震器用橡胶减震垫(结构如图1所示)的研制。 相似文献
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在2006年都灵冬奥会的有舵雪橇比赛中,荷兰代表团所使用的新一代减震器采用了帝斯曼的高性能材料Arnitel热塑性弹性体。由这种创新材料制造的减震器极大地提高了雪橇的稳定性,减少方向操纵失误,帮助雪橇选手取得很好成绩。以往制造减震器用的是橡胶材料,减震效果易受外界温度影响:温度越低,橡胶越硬,减震效果越差。帝斯曼与荷兰应用科学研究组织密切合作,推出的减震器在不同温度下具有稳定的减震性能,可将雪橇滑行器的震动系数降低40%。帝斯曼生产的Arnitel热塑性弹性体的主要优点是在各种温度条件下其特性不变。钱伯章帝斯曼耐低温Arnite… 相似文献
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利用KRX-17B型高温电炉在真空环境中不同煅烧条件下煅烧方解石烧制氧化钙熟料,水化活性测试显示煅烧温度由1 300℃降到1 200℃时氧化钙水化反应速率“跳跃性”变化,通过钨灯丝扫描电子显微镜(SEM)观察不同煅烧条件氧化钙熟料微观形貌的演变过程并进行分析,发现煅烧温度越高、恒温时间越久的氧化钙熟料基体由疏松、多孔、团聚变得严格致密。“热效应”解释了温度对氧化钙抗水化性、膨胀性能的影响。“外管法”测量配制的卷装静态破碎剂膨胀压力显示,恒温时间一定,当熟料煅烧温度由1 300℃升高到1 500℃时,配制的卷装静态破碎剂膨胀压增大了25.6 MPa;煅烧温度一定,当恒温时间由5 h延长至25 h后,配制的卷装静态破碎剂膨胀压增大了23.4 MPa。 相似文献
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钛化物陶瓷的高温蠕变行为与失效机理 总被引:3,自引:0,他引:3
分析了原位生成含钛复相陶瓷TiB2-TiC(TT),TiB2-TiCxN1-x(TTT)及TiB2-TiC-SiC(TTS)的高温蠕变性能和高温氧化行为,考察在恒定载荷不同温度下,材料挠度随时间的变化,探讨了其高温失效机理,并给出了材料抗三点弯曲高温蠕变方程-挠度/时间方程,结果表明,含钛复相陶瓷TT,TTT及TTS在1100℃时均出现较大的蠕变,因此,上述3种材料不宜在1100℃及以上的温度下使用,指出失效的原因之一是TiB2陶瓷在800℃时的高温氧化及1100℃时的高温热分解。 相似文献
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我公司生产能力为合成氨 8万 t/a、尿素 1 0万 t/a,近年来随着能力的增加 ,变换系统能力明显不足。 2 0 0 0年 8月 ,中、低变炉新添加了部分催化剂 ,并一直运行到 2 0 0 2年 4月 ,在此期间 ,变换系统极不稳定 ,阻力上升 ,蒸汽消耗增加 ,CO跑高。基于以上情况 ,我公司决定对低变炉催化剂重新进行硫化。下面 ,笔者将对本次硫化工作及处理后的效果作一总结。1 变换催化剂的基本情况中变催化剂 B1 1 7,棕褐色圆柱片剂 ,堆密度1 .5~ 1 .6kg/L ,其主要成分 Fe2 O365 %~ 75 %、Cr2 O33%~ 6%。低变催化剂 B30 1 Q,浅兰色球形颗粒 ,粒度 3~ … 相似文献
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To find optimal temperature of the reaction between H2S gas and ZnO-5 at% Fe2O3 sorbent, the effluent gas from a fixed-bed reactor was analyzed by gas chromatography. The experimental results showed that H2S removal efficiency of sorbent was maximum at 650°C and EDX data were in accordance with this feature. XRD analysis exhibited intriguing phenomenon in that different mechanisms were observed at different temperatures. Chemisorption and chemical reaction was considered to be the main mechanism of H2S removal at 600 C and 650°C, respectively. SEM photographs supported this interesting phenomenon, but unfortunately TGA and DTA results could not distinguish it. To investigate the effect of sorbent deactivation on the reaction rate, deactivating factor was considered. 相似文献
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《Ceramics International》2019,45(15):18551-18555
Melting temperature has great influence on the high temperature properties and working temperature limits of ultra-high temperature ceramics (UHTCs) In order to bypass the challenge in the measurement of ultra-high melting points, this paper proposed a novel method to predict UHTCs melting temperature via machine learning. A dataset including more than ten thousand melting temperature data has been established, which covers 8 elements and most of the known non-oxide UHTCs. We built up an element to ceramic system framework by back propagation artificial neural network (BPANN) with the accuracy approaching to 90% and the correlation coefficients approaching to 0.95. Our work provides a probability to get the high accuracy melting temperature of UHTCs, and a more convenient way to develop novel materials with higher working temperature. The given case of melting temperature prediction of Hf-C-N ceramics proves the generality of the artificial neural network (ANN). An inter-validation of melting temperature prediction using our network with materials thermodynamics and density functional theory (DFT) has been demonstrated, indicating that our network is of powerful prediction ability. 相似文献
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《Ceramics International》2023,49(8):11865-11874
3Y-TZP ceramics are prepared by solid state method and surface carburization process, and the effect of surface carburization on its the low temperature degradation is studied. The conventional sintered samples completely lost its mechanical properties after aging for 15 h, while the failure time of the surface carburized samples are 300 h. In addition, the nuclear growth rate of the surface carburized samples (αd) and the nucleation rate (Nr) is lower than that of sintered samples, αd plays a dominant role in the degradation process at low temperature and is the key factor determining the aging rate. At the same time, it is found that carbon is dissolved in zirconia lattice in the form of electrically neutral atoms, which will not destroy the original charge balance and produce new oxygen vacancies when entering the interstitial site. More importantly, the precipitation rate of Y3+ from zirconia lattice is the key factor to determine the low-temperature phase transition of tetragonal-monoclinic(T-M). The treatment method of surface carburization has significantly improved the low-temperature degradation performance of 3Y-TZP ceramics, which provides a basis for the application of zirconia ceramics in low-temperature and humid environment. 相似文献
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介绍了中低低工艺及其流程和全低变工艺及其流程的特点和适用范围,从设计方面对工艺中出现的问题进行了分析和探讨,并提出了解决途径. 相似文献