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High performance metakaolinite based cementitious materials were prepared with metakaolinite as main component, and the different modules of Na and Na-K silicate solutions as diagenetic agent. The results show that the mechanical properties are affected by different silicate solutions, compressive strengths of pastes hydrated for 3 d and 28 d with Na-K silicate solution (The modulus is 1) are about 43.68 and 78.52 MPa respectively. By analyzing the mechanical properties of Metakaolinite based cementitious materials, the diagenetic effect of lower module is better than higher module, and Na-K silicate solution is better than Na silicate solution. The structure of the Na and Na-K silicate solutions is studied with IR and 29Si NMR, the reason of the lower module and Na-K silicate solution improving the mechanical properties is that the low module silicate solution has lower polymeric degree of silicon dioxide, and the higher polymeric degree of silicon oxide tetrahedron(Q^4) in Na-K silicate solution is less than Na silicate solution. 相似文献
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通过激光熔覆在45钢表面制备出过饱和的WC增强Ni基复合涂层.对制备的复合涂层进行磨损试验,后采用MX2600FE场发射扫描电镜观察涂层磨损表面组织,发现涂层中产生了原始组织中不存在的析出颗粒.通过HV-1000型显微硬度仪和磨损试验设备研究了析出颗粒对涂层硬度和耐磨性的影响.结果表明:相同成分配比的复合涂层其产生的析出相能提高涂层的硬度,也能改善涂层的耐磨性能. 相似文献
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激光熔覆纳米WC/Ni60涂层水润滑磨损组织变化特征 总被引:1,自引:0,他引:1
采用优化后的激光熔覆工艺参数,以团聚纳米晶WC颗粒为增强相,在45钢表面熔覆上一层纳米WC增强Ni基合金复合涂层。采用SEM、EDS、X-ray等技术手段,对涂层表面磨损前和磨损后的显微组织和元素含量进行了分析研究,得到以下结论:磨损表面在摩擦应力作用下,发生了明显的相变特征,其中涂层中碳化物形成元素的位错扩散发生明显... 相似文献
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乙烯装置裂解炉的节能技术 总被引:13,自引:0,他引:13
介绍了节能技术在乙烯装置裂解技术上的应用,包括炉管改进、裂解炉优化、与燃汽轮机的联合、抑制结焦等,这些技术目前都已得到了应用,提高了裂解技术的水平。 相似文献
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提出仿地成岩思想,即遵循地壳元素组成丰度和/或岩石矿物组成,运用地质学理论和岩石矿物学理论,以获得类似于地壳中已存在的岩石为研究目标.材料仿地设计是将仿地成岩思想运用于材料设计中,主要包括组成仿地、过程仿地、结构仿地以及功能仿地.并以硅铝基胶凝材料--凝石为例说明材料仿地设计的步骤和层次. 相似文献