W6Mo5Cr4V2模具钢电化学抛光工艺研究

采用电化学方法对W6Mo5Cr4V2电抛光工艺进行了研究。抛光溶液采用无铬酸盐的磷酸-硫酸体系,添加高分子聚乙二醇。抛光溶液组成为H3P04（85％）500gH2SO4硫酸（98％）130g聚乙二醇130g甘油30g工艺条件：75—95℃阳极电流密度8—15A．dm^-2研究结果表明，聚乙二醇能有效地形成粘膜，明显提高W6M05Cr4V2电抛光的效果，该工艺减少了环境污染。降低了溶液成本，可以使W6M05Cr4V2表面达到镜面光亮的效果。     

W6Mo5Cr4V2模具钢电化学抛光工艺的研究

采用电化学方法对W6Mo5Cr4V2电抛光工艺进行了研究.抛光溶液采用无铬酸盐的磷酸-硫酸体系,添加高分子聚乙二醇.抛光溶液组成为H3PO4(85%)500g,H2SO4硫酸(98%)130 g,聚乙二醇130 g,甘油30 g,工艺条件:75～95℃,阳极电流密度8～15 A·dm-2.研究结果表明:聚乙二醇能有效地形成粘膜,明显提高W6Mo5Cr4V2电抛光的效果.该工艺减少了环境污染,降低了成本,可以使W6Mo5Cr4V2表面达到镜面光亮的效果.     

高速工具钢电化学抛光

讨论了高速工具钢（W9Mo3Cr4V）电抛光，分别研究了电流密度、抛光时间和抛光温度与粗糙度之间的关系，并应用正交实验找出了一组适舍高速工具钢电抛光的最佳工艺奈件。     

不锈钢电抛光工艺的研究

采用电化学方法对不锈钢电抛光工艺进行了研究.抛光溶液采用无铬酸盐的磷酸-硫酸体系,添加高分子聚乙二醇.抛光溶液组成为H3PO4(85%) 500 g,硫酸(98%) 130 g,聚乙二醇(18.5%水溶液)130 g,甘油30 g.工艺条件为:75～95 ℃,阳极电流密度8～15 A·dm-2.研究结果表明,聚乙二醇能有效地形成粘膜,明显提高不锈钢电抛光的效果.该工艺减少了环境污染,降低了溶液成本,可以使不锈钢表面达到镜面光亮的效果.本文还分析了抛光后钝化膜对不锈钢耐蚀性能的影响.     

类型控制试样法直读光谱分析高速工具钢的化学成份

本文对采用类型控制试样法分析高速工具钢的化学成分进行了研究，选取具有代表性的两种牌号的工具钢W9Mo3Cr4V,W6Mo5Cr4V2做为实验材料进行直读光谱分析，通过大量的实验数据证明本方法快速、准确、可靠，可应用于日常检验。     

挤出机螺杆元件材料及工艺分析

为满足塑料填充、增强和共混改性的要求 ,对同向旋转双螺杆挤出机的典型螺杆元件螺纹套、捏合块的不同材料及制造工艺进行了分析和比较。主要介绍了 3 8CrMoALA合金钢调质氮化处理 ;高速钢 (W 6Mo5G4V2 、W 18Cr4V)整体淬火 ;40Cr调质基材涂层工艺。     

纺织剪刀用W9Mo3Cr4V钢镀TiN薄膜的表面性能

为改善纺织剪刀用W9Mo3Cr4V高速钢的表面性能,采用多弧离子镀技术对其进行镀TiN表面处理。以X射线衍射和扫描电镜对镀膜进行微观分析。在载荷500kg、加载时间1min的条件下,用摩擦磨损试验机测试了镀TiN薄膜前后W9Mo3Cr4V钢的耐磨性。在3%NaCl溶液中测试了W9Mo3Cr4V钢镀TiN薄膜前后的极化曲线。结果表明,镀TiN能明显提高W9Mo3Cr4V钢的抗磨损性能以及抗腐蚀性能。     

钢铁电抛光溶液

所发明的钢铁电抛光溶液为：（均为质量分数）氯化铵及氯化钠分别为2％－4％及2％－3％，主要用于结构钢的电抛光，使用该溶液对钢铁进行电抛光可以大大降低钢铁件的表面粗糙度，并可以提高表面的反光系数。     

粗钨酸钠溶液亚铁盐沉淀法除铬、钒的热力学分析及实验验证

废硬质合金再生利用过程中得到的粗钨酸盐溶液Cr、V含量容易超标，由于Cr、V与W具有十分相似的水溶液性质，粗钨酸盐溶液除铬、钒一直是个技术难题。本文针对亚铁盐沉淀法从粗钨酸钠溶液中除铬、钒工艺过程进行热力学分析研究，分别绘制了298K时Cr-Fe-H₂O体系和V-Fe-H₂O体系的Eh-p H图、Cr⁶⁺-Fe³⁺-V⁵⁺-H₂O体系和Cr³⁺-Fe²⁺-Fe³⁺-V⁵⁺-H₂O体系的热力学平衡图。热力学分析结果表明：粗钨酸钠溶液中Cr(Ⅵ)在酸性和碱性体系下均能够被Fe²⁺或Fe(OH)₂沉淀还原，V(Ⅴ)则会与Fe2+或Fe(OH)₂反应生成Fe(VO₃)₂沉淀；在Cr³⁺-Fe²⁺-Fe     

模具钢无黄烟化学抛光的研究

模具钢抛光过程中往往会产生严重污染环境和危害人体健康的NOx气体。本文研究了难抛光3Cr2W8V模具钢“无黄烟”化学抛光工艺。经正交试验确定抛光液的组成及最佳浓度和工艺参数；并分析了各种添加成份对模具钢化学抛光光亮度的影响。结果表明，在室温条件下抛光11min就可以使3Cr2W8V模具钢表面获得满意的光亮度，具有广阔的应用前景。     

Peculiar properties of UMB4 (M = V,Cr, Mo,W) uranium borides

ABSTRACT

UMB₄ (M?=?V, Cr, Fe, Co, Mo, W, Re, Os) materials prepared by arc-melting have UMB₄ as the main phase, with (V, Cr, Fe, Co) crystallising in the YCrB₄ structure type, while (Mo, W, Re, Os) adopt the ThMoB₄-type. For M?=?V, Cr, Mo, W the magnetic susceptibility is low and only weakly temperature dependent, but higher than α-U, which can be ascribed to a higher density of states at the Fermi level. Heat capacity results point to a very high Debye temperature for both structures, which is associated with very high lattice stiffness of the boron network. However, for W and Mo the boron vibrations are accompanied by low-energy Einstein modes coming from vibrations of the atoms inside the boron cages that could lead to superconductivity. The electronic structure of UMB₄ is influenced by a strong 5f-d hybridization and by the B-2p states, which explains the observed weak Pauli paramagnetism.     

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.     

Nucleation and growth of anodic films on stainless steel alloys I. Influence of minor alloying elements and applied potential on passive film growth

The influence of minor alloying elements (Mo, V, W) when added to a Fe18Cr alloy on the ability of a passive film to nucleate and grow on a freshly generated metal surface, and on the subsequent stability of the film was investigated as a function of electrolyte composition and applied potential using a scratch chronoamperometric technique. Mo and V decreased the rate of active dissolution prior to passivation, allowing the onset of passivation to occur more rapidly, and also improved the stability of the passive film, especially to attack by Cl^– in acidic (H₂SO₄, HClO₄) solutions. W additions had a detrimental effect on the repassivation behaviour of Fe18Cr. Repassivation of the scratch scars was evaluated, from the current transients, in terms of the number of layers of surface film formed.     

硬质合金表面的电解整平与抛光

研究了钨钴镍硬质合金表面的电解整平与抛光,探讨出一套新的含ＮａＮＯ３、ＮａＯＨ、ＥＤＴＡ、乙二醇以及聚乙二醇单烷基醚的电解液配方,利用该电解液,可以在几十秒内对硬质合金表面进行精密的整平与抛光处理     

Polishing effect on anodic titania nanotube formation

Titania nanotubes represent exciting opportunities in solar cell, sensing, and catalytic applications. In this work, four different surface polishing conditions: as-received, chemical polishing, mechanical polishing, and electropolishing, are studied in order to understand the effect of different surface conditions on the anodization process and nanotube morphology. At the same anodization condition of 100 V in 0.1 M NH₄F ethylene glycol at 0 °C for 3 min, the as-received and mechanically polished samples show nano-tubular surfaces while the chemically polished and electropolished samples have oxide layers on the top of the nanotubes. The nanotube morphologies, anodization current vs. time curves, and the bottom barrier layers are all related to the Ti surface conditions. The electropolished surface leads to the most homogeneous TiO₂ nanotube formation.     

丙烷氨氧化制丙烯腈的催化剂研究

运用催化剂设计的集团结构适应理论,给出了丙烷氨氧化反应制丙烯腈的具体反应历程,研制了一系列丙烷氨氧化丙烯腈的催化剂,并详细考察了催化剂中Ｖ,Ｓｂ,Ｗ,Ｓｎ,Ｐ,Ｋ,Ｃｒ,Ｍｏ等组分对反应结果的影响。     

Elastic and electronic properties of XB2 (X=V,Nb, Ta,Cr, Mo,and W) with AlB2 structure from first principles calculations

The crystal structure, electronic properties, mechanical properties, and anisotropy of XB₂ (X=V, Nb, Ta, Cr, Mo, and W) were calculated by first principles calculations based on density functional theory (DFT) with the generalized gradient approximation (GGA). The results are in good agreement with available theoretical and experimental values. The calculated cohesive energy and formation enthalpy indicate that they are thermodynamically stable structures. The elastic constants satisfy all of the mechanical stability criteria. The mechanical moduli were predicted by the Voigt–Reuss–Hill approximation. The mechanical anisotropy was indicated by the surface constructions of Young's moduli, and the results show that anisotropy of WB₂ is stronger than others. The electronic structure indicates that the bonding behaviors of XB₂ (X=V, Nb, Ta, Cr, Mo, and W) are the combinations of covalent and metallic bonds. The hardness of the borides was also evaluated, and the result reveals that TaB₂ is the hardest compound among them.     

Na2XO4(X=Cr、MO、W)固-固相变贮热的测定

利用DTA－TG热分析技术研究了无机塑晶材料Na2XO4(X=Cr、Mo、W)的热性能，实验数据表明，三种材料是一种有前途的固－固相变贮热材料，其固－固相变贮热的机理是随着温度升高，三种晶体的晶格发生畸变，晶型由低对称的晶系向高对称的晶系转变，同时引入振动和转动无序，从而吸收热量。