排序方式: 共有32条查询结果,搜索用时 15 毫秒
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对影响TP321不锈钢无缝钢管耐晶间腐蚀性能的因素进行分析,从化学成分、金相组织、工艺流程、热处理制度等方面研究可能导致耐蚀性降低的原因,并采取措施消除不利影响。通过控制化学成分、调整热处理制度以及优化脱脂工艺等一系列改进措施,使TP321不锈钢无缝钢管晶间腐蚀试验一次合格率稳定在95%以上水平。 相似文献
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B. Campillo C. Rodriguez J. Genesca J. Juarez-lslas . Flores L Martinez 《Journal of Materials Engineering and Performance》1997,6(4):449-453
Commercial magnesium anodes were evaluated using ASTM G 97-89 for a standard test along with a technique of electrochemical
impedance. Several heat treatments were performed, and the anodic efficiency was determined, showing an incremental increase
of 10 to 12 % of the efficiency demonstrated by the nontreated commercial anodes (as-cast condition). The increase in efficiency
was related to the microstructural characteristics. The appearance of second phase particles influenced the form of the corrosion
process. 相似文献
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以TiO2 ZrO2 P2O5为复合成核剂,采用传统熔融冷却法获得了高ZnO含量的Li2O-A l2O3-SiO2系统的基础玻璃。通过差热分析确定了该玻璃的热处理条件、晶化性能,利用梯温炉实验、X射线衍射分析和扫描电镜对晶化试样的物相和微观结构进行了研究,讨论了热处理制度对玻璃的析晶及热膨胀系数的影响。研究结果表明:含10%(质量分数)ZnO的LAS系统样品玻璃最佳核化温度为(710±2)℃,玻璃的晶化活化能E为(275±2)kJ/mol,晶化指数n为3.11±0.2,样品玻璃在较低温度下失透,并且随着晶化温度升高,样品的热膨胀系数加大。 相似文献
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骆芳 《浙江工业大学学报》2003,31(2):234-236
对72B纺织用钢丝圈进行失效分析,发现钢丝圈使用性能不合格的主要原因是热处理炉仪表指示温度偏差太大及热处理工艺规范不合理,使得球化退火后的金相组织出现粗晶铁素体,淬火和回火后的金相组织出现铁素体、粒状渗碳体,使材料塑性增加,满足不了使用性能。 相似文献
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本文综述了近年来日本、瑞士布勒公司和我国的精洁米生产,并作了对比分析,认为我国今后的精洁米生产应加强对米粒表面的热处理,以确保米粒表层淀粉粒的胶质化。 相似文献
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通过力学性能以及抗应力腐蚀的测定,对7005铝合金的热处理工艺进行了研究。结果表明,该合金较为理想的热处理制度是470℃固溶处理后水淬,人工时效制度为双级时效100℃×8 h+120℃×24 h。热处理后,合金的室温拉伸强度达到400 MPa以上,抗腐蚀性能良好,析出相呈细小而弥散分布,对合金有很好的强化效果。 相似文献
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《International Journal of Hydrogen Energy》2019,44(39):21559-21568
In this paper, the electro-catalytic methanol oxidation on the commercial carbon black treated with ozone at different temperatures to support platinum (Pt) nanoparticles was investigated. The necessary techniques like transmission electron microscopy (TEM), Raman spectroscopy, nitrogen adsorption-desorption techniques, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) have been used to discovery the composition, morphology and structure of the catalysts. The electro-catalytic methanol oxidation activity and durability of the catalysts was estimated by the cyclic voltammetry and chronoamperometric techniques. The results indicated that the platinum nanoparticles with average sizes of 2.04 nm can be uniformly dispersed on the surfaces of carbon black oxidized by ozone at 140 °C. In the meanwhile it has significantly high electro-catalytic activity for methanol oxidation. This phenomenon is attributed to the fact that ozone oxidation increase the content of oxygen-containing groups on the carbon black, which is helpful for improving the dispersion and decreasing the size of platinum nanoparticles. Oxygen-containing groups play a critical role in enhancing the performance of methanol electro-oxidation. 相似文献
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