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Chemical Durability, Properties and Structural Approach of the Glass Series xFe2O3-(45-x) PbO-55P2O5 (with 0 ≤ x ≤ 20;mol%)
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作者 Radouane Makhlouk Zineb Chabbou +2 位作者 Yassine Er-rouissi M’hammed Taibi Said Aqdim 《New Journal of Glass and Ceramics》 CAS 2023年第1期1-16,共16页
The synthesis for glasses series xFe<sub>2</sub>O<sub>3</sub>-(45-x)PbO-55P<sub>2</sub>O<sub>5</sub>, (with 0 ≤ x ≤ 20;mol%) carried out in a temperature (1050 ± ... The synthesis for glasses series xFe<sub>2</sub>O<sub>3</sub>-(45-x)PbO-55P<sub>2</sub>O<sub>5</sub>, (with 0 ≤ x ≤ 20;mol%) carried out in a temperature (1050 ± 10)°C, leads to obtaining transparent glasses, brown in color and with a non-hygroscopic appearance. The study of glasses dissolution rate, immersed in distilled water at 90°C for 24 days, indicates a considerable chemical durability. The increase in the Fe<sub>2</sub>O<sub>3</sub> content in the vitreous network to the detriment of PbO is a favorable factor for the chemical durability improvement. Different techniques have been used such as X-ray diffraction, infrared spectroscopy, DSC, SEM and density for the study of these glasses. These techniques have led to establish correlations between chemical and structural properties. Thus the results obtained confirmed the creation of P-O-M bonds (M = Pb, Fe) with a strongly covalent nature to the detriment of the hydrated P-O-P bonds and led to the formation, mainly, of pyrophosphate groups. The low melting point of Pb-O makes it possible to play an important role, at the same time, on the viscosity, on the equilibrium between the vitreous bath and the crystallites formed. The dissolution rate obtained is 100 times smaller than that of silicate glasses used as an alternative form for the vitrification of radioactive waste. 展开更多
关键词 Phosphate Glasses Lead Iron Density IR DRX MEB durabilité Chimique VITRIFICATION Nuclear Wastes
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涂层高速钢齿轮滚刀后刀面磨损及耐用度的研究
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作者 周元康 何锋 《贵州工学院学报》 1992年第1期94-99,共6页
本文通过对比涂层与未涂层高速钢滚刀耐用度的实验,得出以各刃齿的平均磨损宽度,作为评定涂层滚刀耐用度性能的指标,并在此前提下得出涂层滚刀在几种不同切削速度下耐用度提高的倍数。
关键词 涂层 耐用度 滚刀 高速钢 齿轮
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新型抗滑薄层胶结材料试验研究
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作者 王小元 《广东交通职业技术学院学报》 2012年第3期18-20,23,共4页
文中以在沥青路面施工薄层铺装的方式对路面进行抗滑安全性处理,重点研究了该薄层铺装胶结材料的各项性能,包括材料基本性能及其对路面附着能力、耐磨性、抗滑能力的影响作用,结果表明该胶结料粘结性能、抗腐蚀性及防水性能较好,由其制... 文中以在沥青路面施工薄层铺装的方式对路面进行抗滑安全性处理,重点研究了该薄层铺装胶结材料的各项性能,包括材料基本性能及其对路面附着能力、耐磨性、抗滑能力的影响作用,结果表明该胶结料粘结性能、抗腐蚀性及防水性能较好,由其制备的抗滑薄层能较好抵抗行车荷载的磨耗及环境老化作用,从而增强了沥青路面的耐磨耗性能,延长了路面抗滑构造的耐久性。 展开更多
关键词 沥青路面 附着力 耐磨性 抗滑性 耐久性
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Mesoporous TiO2 microparticles formed by the oriented attachment of nanocrystals: A super-durable anode material for sodium-ion batteries 被引量:1
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作者 Liming Ling Ying Bai +4 位作者 Huali Wang Qiao Ni Jiatao Zhang Feng Wu Chuan Wu 《Nano Research》 SCIE EI CAS CSCD 2018年第3期1563-1574,共12页
Spindle-shaped anatase TiO2 secondary particles were successfully fabricated via the oriented attachment of primary nanocrystals. By adjusting the concentration of tetrabutyl titanate, the size of the TiO2 nanocrystal... Spindle-shaped anatase TiO2 secondary particles were successfully fabricated via the oriented attachment of primary nanocrystals. By adjusting the concentration of tetrabutyl titanate, the size of the TiO2 nanocrystals and particles could be controlled, resulting in pore evolution. Pores for the random aggregation of secondary particles gradually transformed to nanopores originating from the oriented attachment of the primary nanocrystals, resulting in an excellent micro/nanostructure that increased the performance of a sodium-ion battery. The mesoporous TiO2 microparticle anode, with its unique combination of nanocrystals and uniform nanopores, displays super durability (95 mAh/g after 11,000 cycles at I C), high initial efficiency (61.4%), and excellent rate performance (265 and 77 mAh/g at 0.1 and 20 C, respectively). In particular, at slow discharge (0.1 C) and fast charge (5, 50, and 100 C) rates, the anatase TiO2 shows remarkable initial charge capacities of 200, 119, and 56 mAh/g, corresponding to 172, 127, and 56 mAh/g, after 150 cycles, respectively, thus meeting the requirements for fast energy storage. This excellent performance can be attributed to the stability of the material and its high ionic conductivity, resulting from the stable architecture with a mesoporous microstructure and without the random aggregation of secondary particles. A fundamental understanding of the pore structure and controllable pore construction has been proven to be effective in increasing the rate capability and durability of nanostructured electrode materials. 展开更多
关键词 oriented attachment pore evolution mesoporous TiO2 durabilit sodium ion batteries
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灌注桩用机制砂混凝土的强度和耐久性分析 被引量:1
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作者 吕锦辉 《土工基础》 2021年第6期728-731,共4页
由于甘肃天然河砂资源稀缺,有大量的灌注桩或各类基础工程中需要应用机制砂混凝土,但目前甘肃在灌注桩中应用机制砂混凝土的经验仍较为缺少。首先对灌注桩用混凝土采用了机制砂与天然河砂进行了对照设计与试配,随后对灌注桩用机制砂混... 由于甘肃天然河砂资源稀缺,有大量的灌注桩或各类基础工程中需要应用机制砂混凝土,但目前甘肃在灌注桩中应用机制砂混凝土的经验仍较为缺少。首先对灌注桩用混凝土采用了机制砂与天然河砂进行了对照设计与试配,随后对灌注桩用机制砂混凝土的强度和耐久性进行了分析。研究结果表明:灌注桩用的三个等级的机制砂混凝土28 d强度能达到相同条件下普通天然河砂混凝土相同的强度等级,且灌注桩用机制砂混凝土强度大部分略高于普通天然河砂灌注桩混凝土;在灌注桩用机制砂混凝土耐久性方面,C40~C60机制砂混凝土的干缩率均小于普通天然河砂混凝土,且在相同的抗冻性等级下,灌注桩用机制砂混凝土的相对动弹性模量均大于河砂混凝土,抗氯离子渗透性能基本接近。表明在强度和耐久性方面,灌注桩用机制砂混凝土能够达到规范和施工的要求。 展开更多
关键词 灌注桩 机制砂 混凝土 强度 耐久性
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