Microstructure and some properties of powder-pack borided Ti–5Mo–5V–8Cr–3Al alloy with special attention to the microstructure at the interface TiB/substrate

The borided layer was prepared on the surface of the Ti–5Mo–5V–8Cr–3Al alloy by powder-pack boriding at 1000°C-10h. SEM, EPMA and TEM were used to investigate the effects of alloying elements (Al, V, Mo and Cr) on the growth of TiB whiskers in the borided Ti–5Mo–5V–8Cr–3Al alloy. Wear properties of borided Ti–5Mo–5V–8Cr–3Al alloy were investigated using dry reciprocating friction tests. SEM results show that the thickness of boride layer in Ti–5Mo–5V–8Cr–3Al alloy is thinner than that in the Cp-Ti. This is attributed to the enrichment of alloying elements especially V in TiB/substrate by TEM, which hinders the diffusion of B atoms, thus resulting in the short and thick TiB whiskers in Ti–5Mo–5V–8Cr–3Al alloy. Borided Ti–5Mo–5V–8Cr–3Al alloy has the better wear resistance than as-received alloy.     

凝胶型99Mo-99mTc发生器研究现状

与裂变型⁹⁹Mo-^99mTc发生器相比，凝胶型⁹⁹Mo-^99mTc发生器制备^99mTc具有工艺简单、产生的放射性废物容易处理、对环境影响小等优点。本文主要论述了凝胶型⁹⁹Mo-^99mTc发生器与裂变型⁹⁹Mo-99mTc发生器的区别，堆照生产⁹⁹Mo原料和凝胶材料的研究进展，凝胶结构以及凝胶组分等多种条件因素对凝胶型⁹⁹Mo-^99mTc发生器性能的影响等，并对低比活度⁹⁹Mo生产^99mTc的研究进展进行综述。     

One-step potentiostatic electrodeposition of Ni–Se–Mo film on Ni foam for alkaline hydrogen evolution reaction

Exploring efficient, abundant, low-cost and stable materials for hydrogen evolution reaction (HER) is highly desired but still a challenging task. Herein, Ni–Se–Mo electrocatalysts supported on nickel foam (NF) substrate were synthesized by a facile one-step electrodeposition method. The Ni–Se–Mo film presents high electrocatalytic activity and stability toward HER, with a low overpotential of 101 mV to afford a current density of 10 mA cm⁻² in 1.0 M KOH medium. Such excellent HER performance of Ni–Se–Mo film induced by the synergistic effects from Mo-doped Ni–Se film leads to the fast electron transfer. This work provides the validity of interface engineering strategy in preparing highly efficient transition metal chalcogenides based HER electrocatalysts.     

Effects of cross rolling on texture,mechanical properties and anisotropy of pure Mo plates

To clarify the influence of the deformation texture on the mechanical properties, pure Mo plates were processed by various cross rolling procedures, and the relation among texture, microstructure and mechanical properties was discussed. The results show that cross rolling of the Mo plates is beneficial for the formation of the rotated cube component, i.e., {001}〈110〉. The corresponding orientation density exhibits a positive correlation with the total rolling deformation and the current-pass deformation. When the total deformation is 96% or greater, the Mo plates form a texture orientation dominated by {001}〈110〉, whereas the γ-fibre texture becomes weaker and the cube texture {100}〈100〉 disappears completely. The presence of {001}〈110〉 has great effects on the properties of cross-rolled Mo plates, which is beneficial for strength enhancement and plasticity reduction in both the rolling direction (RD) and the transverse direction (TD).     

022Cr17Ni12Mo2钢制水灰流量检测器焊接修复工艺

为了准确定位并修复022Cr17Ni12Mo2钢制水灰流量检测器装置内部出现的冲蚀磨损缺陷坑，结合流量检测器装置的实际工况，提出了采用TIG焊接方法修复冲蚀磨损缺陷坑的措施。制定了经济实用的焊接方法，设置了合理的焊接工艺参数，并对该工艺参数下的焊接修复件进行了相关检测。检测结果表明，修复部位满足相关技术条件要求，质量可靠，修复后装置试运行稳定有效，完全达到了使用要求。说明制定的焊接修复工艺合理可行，可用于同类缺陷的焊接修复工作。     

改进加权线性规划法在莫116断块属性建模中的应用

针对莫116断块三工河组砂体展布复杂、储层非均质性强的特点，在构造解释、测井资料处理与解释以及沉积微相研究的基础上，建立了莫116断块的三维地质模型。由于传统模型无法准确描述其地质状况的复杂性，所以在建立属性模型时，采用改进后的加权线性规划法对变差函数进行拟合，随后对地质储量进行复算。研究表明，改进后的加权线性规划法能够显著提高变差函数拟合精度，建立的属性模型更为合理，以此为基础计算所得的储量值也更为精确，研究成果对类似地区的地质建模研究具有借鉴意义。     

Preparation and mechanism of active Mo–Mn metallization on ZTA particles surface and interfacial bonding of reinforced iron matrix composite

ZrO₂ toughened Al₂O₃ particles (ZTAp) have poor wettability with iron, and therefore some defects are easily formed at the interface between ZTAp and iron matrix, which may lead to material failure. This paper illustrates that the ZTAp were modified on the surface by the active Mo–Mn metallization, and thus, they were used as the reinforcing phases to prepare the iron-matrix composite (ZTAp/Fe composite). It is concluded that the sponge-like skeleton structure was formed on the surface of ZTAp after the metallization. The interface of ZTAp/Fe composite, which has been proved to have bearing and transitional capacity by scratch test, was formed by chemical bonding with elemental diffusion, besides mechanical bonding. The metallization mechanism of elemental diffusion can be explained by the migration of glass phase, and the elements diffusion between the interface and iron matrix is to form solid solution.     

2.25Cr-1Mo与2.25Cr-1Mo-0.25V钢冷却转变对比分析

采用相变仪、光学显微镜及扫描电镜研究了2.25Cr-1Mo和2.25Cr-1Mo-0.25V钢冷却转变过程,并分析了钒对其冷却转变的影响。结果表明,与2.25Cr-1Mo钢的CCT曲线相比,2.25Cr-1Mo-0.25V钢铁素体转变区及贝氏体转变区均向右移,并且在现有试验条件下已无法观察到珠光体转变区;钒添加到2.25Cr-1Mo钢中,能够提高钢的淬透性,2.25Cr-1Mo-0.25V钢在48 000 ℃/h冷速下能生成部分马氏体;钒能够细化钢板显微组织,与2.25Cr-1Mo钢相比,2.25Cr-1Mo-0.25V钢在800 ℃/h冷速下组织更为细小。     

Mo/γ-Al2O3催化剂制备及催化氧化船用燃料油脱硫

以γ-Al2O3为载体，采用浸渍法制备了负载型催化剂Mo/γ-Al2O3。利用X-射线衍射仪(XRD)、N2-吸附脱附、H2程序升温还原(H2-TPR)等手段对催化剂进行了表征。分别以二苯并噻吩(DBT)、4,6-二甲基二苯并噻吩(4,6-DMDBT)、苯并噻吩(BT)和噻吩(Th)的正辛烷溶液作为模拟燃料油，异丙苯过氧化氢(CHP)为氧化剂，评价了Mo/γ-Al2O3的催化氧化脱硫(ODS)活性；并将Mo/γ-Al2O3催化剂应用于馏分型船用燃料油氧化脱硫。结果表明：Mo/γ-Al2O3催化剂对不同结构的含硫化合物的催化脱硫活性由大到小的顺序为DBT、4,6-DMDBT、BT、Th；Mo/γ-Al2O3上的Al2(MoO4)3为主要活性中心；在反应温度80 ℃、氧/硫原子比5、催化剂用量1.0 g时，硫质量分数为1.6%的船用燃料油的脱硫率可达到82.6%，硫质量分数可以降至0.3%，达到了最新船用燃料油标准硫质量分数低于0.5%的规定。催化剂重复使用10次后，催化剂活性没有明显的降低。     

Hydrogen storage comparison of M doped vanadium oxide nanotubes (M = Mo,Zr and W): A molecular simulation study

Zr, Mo and W doped Vanadium oxide nanotube were considered as remarkable materials for hydrogen storage applications. Monte Carlo molecular simulation was performed to study the adsorption behavior of hydrogen molecules on Vanadium oxide nanotubes (VONTs). The effects of temperature, pressure and mole percent of hydrogen on adsorption capacity of VONTs were investigated to provide deep insight of adsorption behavior. The results represented that hydrogen adsorption is an increasing function of pressure and at about 50 MPa all three metal doped VONT has maximum hydrogen capacity. At 5 MPa and room temperature, the hydrogen capacities of Mo, W and Zr doped VONTs were 1.39, 0.88 and 1.43 w% respectively. With temperature increment up to room temperature, more reduction in initial hydrogen capacity were observed in Mo and Zr doped VONTs.Evaluating hydrogen adsorption of Zr doped VONT from pure and hydrogen /nitrogen mixtures at 300 K indicated that under 2 Mpa, modifications in adsorption capacities were insignificant after N2 addition to the environment. Therefore, Zr doped VONT in hydrogen /nitrogen mixture environment can act as a capable adsorbent for Hydrogen storage system in comparison with Mo and W doped VONTs.