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The 8% (mass fraction) yttrium-partially-stabilized zirconia (8YSZ) ceramic was fabricated via liquid phase sintering at 1
200–1 400 °C by adding different mass ratios of CuO-16.7%TiO2 (molar fraction) as sintering aid. Relative density, microstructure, Vickers hardness and bending strength as a function
of sintering temperature and additive content were investigated. The experiment results show that liquid phase sintering at
low temperature can be realized through adding CuO-16.7% TiO2 to 8YSZ. The Vickers hardness and bending strength of samples with sintering aid are generally much higher than those of
samples without sintering aid for all sintering temperatures, and increase with the increase of sintering temperature. When
the addition content of CuO-16.7% TiO2 is beyond 0.5%, the relative density, Vickers hardness and bending strength decrease with the increase of the mass ratio
of sintering aid. Low additions of sintering aid are beneficial to aiding densification; high additions of sintering aid are
detrimental to the sintered properties mainly due to greater amounts of pores generated by the volatilization of oxygen with
the eutectic reaction between copper oxide and titanium dioxide. It is found that the fine grain size and high relative density
are two main reasons of the high bending strength and Vickers hardness of the materials. 相似文献
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将某七桥车辆的油气悬架系统混合耦连并对其原理和结构进行分析,建立了整车十七自由度动力学模型。基于整车结构和数学模型,以Simulink为主平台,搭建了整车的Simulink/AMESim联合仿真模型,仿真激励为白噪声法生成的相关性路面时域模拟信号。确定所需仿真参数后,进行整车的联合仿真和实际道路试验研究,得到了40 km/h和60 km/h车速下的对比曲线。对比结果显示,质心加速度均方根和功率谱密度峰值的仿真数据与试验数据的相对误差小于8%,仿真结果与试验结果基本吻合,说明所建立的整车模型具有较高的准确性,可以作为整车特性研究的依据。 相似文献
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GPS在塔里木河生态综合治理工程中的应用 总被引:1,自引:0,他引:1
对GPS技术在塔里木河生态综合治理工程中的应用进行的分析表明:①在塔里木河干流进行大范围、低等级高程测量时,利用GPS“大地水准面精化”技术,可以减轻劳动强度、缩短作业时间、提高作业效率、及时提供准确的基础资料,从而为抢救下游生态赢得时间;②为满足塔里木河综合治理对测绘工作的要求,充分发挥GPS技术优势,应在塔里木河干流区域建立一个统一的“似大地水准面模型”,这在目前的技术条件下是可行的,也是可靠的;③建议将GPS网和国家GPS网跟踪站进行联测,以提高成果精度。 相似文献
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分析了三角高程测量的数学原理及各种影响测量精度的误差来源,指出三角高程测量代替长距离的跨河水准精度的可靠性及实践的可操作性。并通过工程实践证明,在一定的观测条件下,其精度可以达到二等水准的精度要求。 相似文献
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采用沉淀-煅烧法制备了F掺杂HA的FHA(Ca10(PO4)6(OH)2-2xF2x,0≤x≤1)粉末。通过X射线衍射(XRD)、热重分析(TG)、高温膨胀仪,扫描电镜(SEM),能谱仪(EDS)以及模拟体液浸泡实验研究了F掺杂对FHA高温热稳定性,高温烧结性能,热膨胀系数和生物活性的影响。结果表明,F掺杂能够提高FHA的高温热稳定性,且随F掺杂量增加,其稳定性逐渐提高;少量F(x=0.25)掺杂提高了HA基体的烧结致密度,随F含量增加(x0.25),烧结致密度下降;F掺杂能降低FHA高温热膨胀系数(CET),随着F含量的增加,FHA的CET值减小。类骨磷灰石在块体表面的生长能力为FHAHAFA,其中x=0.5和0.75的FHA具有最好的生物活性。 相似文献
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