钛钢复合板容器复层角焊缝泄漏的检测方法

钛钢复合板材料广泛应用于压力容器中,钛钢复合板复层钛贴条盖板或接管钛衬筒角焊缝进行水压测试时出现微量泄漏也较为常见,焊缝泄漏点的查找是非常考验检验方法、检验技能和检验经验的。通过查找钛钢复合板容器一接管钛衬筒角焊缝的泄漏缺陷,详细介绍了六种查漏检测方法的操作实践情况和优缺点。     

不锈钢复合板压力容器的设计制造技术

不锈钢复合板容器在整个的设计制造中,有很多的技术关键点需要注意。本文对不锈钢复合板容器设计制造过程中的技术要点进行了分析,并列举四个重要点进行探讨同时在技术要点分析的基础上给出了设计制造中的相关建议。     

钛复合板管箱的制造流程及工艺要点

钛复合板管箱在常减压装置普遍应用。钛材独特的物理化学特性,决定了钛复合板制管箱具有自身特点的制造流程及工艺要点。本文对中石化某项目中钛复合板管箱的制造,整理了相应的流程及工艺要点。     

大型钛-钢复合板塔器制造工艺研究

介绍了钛-钢复合板塔器的制造工艺,包括关键零部件的制造、钛-钢复合板的焊接、焊缝质量检验、热态循环试验和阳极化处理等,对钛-钢复合板类似设备的制造、检验具有一定的参考意义。     

氨解反应釜的设计技术探讨

由于钛-钢不可熔焊的特性,致使钛-钢复合板设备的结构特点比较特殊。以邻苯二胺生产线中核心设备,典型的钛-钢复合板结构反应釜为例,通过介绍该反应釜的工作原理以及设备结构,总结了钛-钢复合板设备中关键部件的设计以及加工制造控制要点等方面的内容,并对其主要结构件进行了详细的分析论证及优化设计,同时对制造的难点进行了探讨。     

钛-钢复合板设备的结构优化

近些年,钛制设备在我国的氯碱工业、尿素生产、精细化工、硝酸生产、PTA等行业得到了广泛应用,我国的钛需求量也逐年增高.国内设计、制造、使用钛制设备已有30余年的历史,积累了一些经验,掌握了一些设计、制造和使用技术.而今钛-钢复合板制设备占据了钛制设备的大部分应用,但钛-钢复合板制设备比钢制设备在设计、制造上具有更多的难度,需要将成熟、可靠的结构设计进行传播,并不断探寻更加合理、有效的结构形式.     

超高分子量聚乙烯低温容器的制备与性能研究

针对目前低温容器的现状,提出用超高分子量聚乙烯（UHMWPE）作为低温容器结构材料的构想,并设计和制造出该低温容器。对UHMWPE低温容器进行了低温力学性能检测和绝热性能校核,结果表明该低温容器满足设计要求。     

复合板制压力容器制造中常见的问题分析

随着复合板近些年使用范围的不断扩大,在很多情况下开始代替纯不锈钢使用。本文阐述了在制造复合板压力容器过程中常见的问题,并深入研究了镍金合金的复合钢板和不锈钢复合钢板和铜复合板、钛复合板和铝复合板等两类复合板压力容器之间的异同点,对制造过程中需要注意的问题进行了广泛的探讨。     

厚壁不锈复合板加氢反应釜的制造

在厚壁不锈复合板加氢反应釜高压容器的制造过程中,利用特制的定位组装夹具,借助现代化的科技手段——红外线电加热,选用优化的焊接工艺参数,经过严格的质量控制,很好地保证了厚壁不锈复合板容器的制造质量,为同类设备的制造提供了借鉴。     

厚壁不锈复合板加氢反应釜的制造

在厚壁不锈复合板加氢反应釜高压容器的制造过程中,利用特制的定位组装夹具,借助现代化的科技手段——红外线电加热,选用优化的焊接工艺参数,经过严格的质量控制,很好地保证了厚壁不锈复合板容器的制造质量,为同类设备的制造提供了借鉴。     

钛白冷冻结晶罐钛材包覆搅拌器的应用技术

本文探讨了钛材白冷结晶罐中防腐蚀的机理，提出了钛材料用作防腐蚀层的搅拌包覆层的结构设计，制造技术及成本和可靠性分析。     

钛及其合金焊制压力容器制造质量的关键问题

通过分析钛材的固有物理化学性能，论述了钛制压力容器制造过程中，产生杂质元素污染的主要环节及其危害性、表面特征以及主要监检环节的设置。     

钛制设备的设计与制造

介绍了钛材的化学、物理性能、力学性能以及耐腐蚀性能,并根据醋酸乙烯装置中钛制设备的设计实例,阐述了钛制换热器和塔器的结构设计特点、技术要求、以及加工、焊接及热处理工艺.     

Novel Synthesis of Ordered MCM-41 Titanosilicates with Very High Titanium Content via Ultrasound Radiation

A novel synthetic strategy has been developed for the fabrication of mesostructured titanosilicate with very high titanium content. By the combination of ultrasound radiation and a separate hydrolysis procedure, highly ordered MCM-41 titanosilicates can be synthesized within 3 h from gels with Ti/Si ratios up to 1. The physicochemical properties of the materials were characterized by means of XRD, TEM, FT-IR, UV-Vis DRS, ²⁹Si MAS NMR, and liquid nitrogen adsorption-desorption measurements. The results suggested that during crystallization, sonication re-dispersed and accelerated the condensation of inorganic species, and resulted in more condensed pore walls compared to those synthesized with the conventional methods. The presence of silica and ultrasound radiation remarkably suppressed the aggregation of titanium species, thus, at the medium titanium level, a relatively homogeneous dispersion of titanium within the MCM-41 framework was attained.     

Benefits and Biosafety of Use of 3D-Printing Technology for Titanium Biomedical Implants: A Pilot Study in the Rabbit Model

Background: Titanium has been used in osteosynthesis for decades and its compatibility and safety is unquestioned. Studies have shown that there is release and collection of titanium in the organ systems with little note of toxicity. The gold standard is considered to be titanium osteosynthesis plate produced by milling methods. The use of customized titanium plates produced with 3D printing, specifically direct metal laser sintering, have found increasing use in recent years. It is unknown how much titanium is released in these printed titanium implants, which is known to be potentially porous, depending on the heat settings of the printer. We hypothesize that the amount of titanium released in printed titanium implants may be potentially more or equal compared to the gold standard, which is the implant produced by milling. Methods: We studied the biosafety of this technology and its products by measuring serum and organ titanium levels after implantation of 3D-printed versus traditionally fabrication titanium plates and screws in a pilot study using the rabbit model. A total of nine rabbits were used, with three each in the control, milled and printed titanium group. The animals were euthanized after six months. Serum and organs of the reticuloendothelial system were harvested, digested and assayed for titanium levels. Results: Organ and serum titanium levels were significantly higher in rabbit subjects implanted with titanium implants (milled and printed) compared to the control group. However, there was no significant difference in organ and serum titanium levels of subjects implanted with milled and traditionally fabricated titanium implants. Conclusions: The biosafety of use of 3D-printed titanium implants and traditionally fabricated titanium implants are comparable. With this in mind, 3D-printed custom implants can not only replace, but will very possibly surpass traditionally fabricated titanium implants in the mode and extent of use.     

Tubular Cathode Prepared by a Dip‐Coating Method for Low Temperature DMFC

A novel tubular cathode for the direct methanol fuel cell (DMFC) is proposed, based on a tubular titanium mesh. A dip‐coating method has been developed for its fabrication. The tubular cathode is composed of titanium mesh, a cathode diffusion layer, a catalyst layer, and a recast Nafion® film. The titanium mesh is present at the inner circumference of the diffusion layer, while the recast Nafion® film is at the outer circumference of the catalyst layer. A DMFC single cell with a 3.5 mgPt cm^–2 tubular cathode was able to perform as well, in terms of power density, as a conventional planar DMFC. A peak power density of 9 mW cm^–2 was reached under atmospheric air at 25 °C.     

大型钛钢复合板压力容器的设计

针对大型钛钢复合板制压力容器的制造和使用特点,从容器设计中有关材料选择、结构设计、试验检验等方面,进行了详细的分析和总结,提出了在设计中需要注意的设计要点。     

Fabrication and Characterization of Carbon Nanotube–Titanium Nitride Composites with Enhanced Electrical and Electrochemical Properties

This work reports the fabrication and the characterization of a new composite consisting of multiwalled carbon nanotubes (CNTs) and conducting titanium nitride (TiN) with a higher specific surface area ( S _BET), enhanced electrical conductivity (σ), and specific capacitance. With increasing CNT content, the electrical conductivity and electrochemical performance of the CNT–TiN composites gradually increase. In the presence of 5 wt% (12.0 vol%) CNTs, the electrical conductivity and the weight-specific capacitance of CNT–TiN composite are increased by 3.6 times and 54.8% compared with pure TiN, respectively.     

Sol-Gel Processed Strontium Titanate Ceramics

Ferroelectric strontium titanate (SrTiO₃) ceramics have been prepared by sol-gel processing technique. Strontium acetate [Sr(CH₃COO)₂] and titanium (IV) isopropoxide [Ti(OC₃H₇]₄ were used as the precursors for the fabrication of the samples. The stock solution for the preparation of strontium titanate powder was prepared by dissolving strontium acetate in ethanol and acetic acid solvents and mixing the resultant solution with titanium (IV) isopropoxide in equimolecular amounts. The as fired powder was found to be amorphous. Annealing the amorphous powder at 700°C for one hour in air yields cubic phase crystalline SrTiO₃ powder. Ceramic samples were prepared by pressing and sintering the crystalline powder. The effect of sintering temperature on the structural and dielectric properties were investigated and analyzed.     

Efficient preparation of hybrid nanocomposite coatings based on poly(vinyl alcohol) and silane coupling agent modified TiO2 nanoparticles

In the present investigation, at first, the surface of titanium dioxide (TiO₂) nanoparticles was modified with γ-aminopropyltriethoxy silane as a coupling agent. Then a new kind of poly(vinyl alcohol)/titanium dioxide (PVA/TiO₂) nanocomposites coating with different modified TiO₂ loading were prepared under ultrasonic irradiation process. Finally, these nanocomposites coating were used for fabrication of PVA/TiO₂ films via solution casting method. The resulting nanocomposites were fully characterized by Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), thermogravimetric analysis/derivative thermal gravimetric (TGA/DTG), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The TEM and SEM results indicated that the surface modified nanoparticles were dispersed homogeneously in PVA matrix on nanoscale and based on obtained results a possible mechanism was proposed for ultrasonic induced nanocomposite fabrication. TGA confirmed that the heat stability of the nanocomposite was improved. UV–vis spectroscopy was employed to evaluate the absorbance and transmittance behavior of the PVA/TiO₂ nanocomposite films in the wavelength range of 200–800 nm. The results showed that this type of films could be used as a coating to shield against UV light.