闪光铝粉颜料的制备和表面改性研究进展

概述了目前闪光铝粉颜料的制备和表面改性方法,评述了各种方法的优缺点,对今后闪光铝粉颜料的研制工作进行了展望。     

纳米氧化锌的制备和表面改性技术进展

综述了化学沉淀法、醇盐水解法、微乳液法、固相合成法、溶胶 凝胶法和喷雾热解法的主要特点与优缺点,并对纳米氧化锌的表面改性方法:即表面包覆改性法、表面化学改性法、机械力化学改性法、沉淀反应改性法、外膜层改性(胶囊)法和高能表面改性法进行了概述。     

氢氧化镁的固相制备及其表面改性

采用固相法合成了纯度较高的Mg(OH)2,并利用XRD、SEM等进行了表征.以硬脂酸钠、油酸对其进行表面处理得到改性Mg(OH)2,沉降实验表明其与液体石蜡中有较好的相容性,而且油酸改性Mg(OH)2显示出更好的效果.     

超高压水喷射技术在表面预处理中的应用

表面预处理是一项复杂的技术难题 .本文主要介绍了超高压水喷射技术的工作原理、系统、组成、设备参数以及在表面处理中的应用 .     

铝合金表面脱氧化物/出光处理技术研究

以含有较多较难去除的含铜金属间化合物黑色颗粒的铝合金2024-T3为研究对象,通过金相观察,开发了一种用于碱蚀后铝合金表面脱氧化物/出光的浓–稀两阶段处理技术。室温下先用含有5.0g/LNaHF2和100g/LFe2(SO4)3的30%(质量分数)硝酸溶液处理7min,然后用含有0.5g/LNaHF2的1%(质量分数)硝酸溶液处理4min,可有效去除碱洗后铝合金表面的黑色氧化物,形成无污染的氧化铝薄层。该工艺简单、快速、成本低,为后续转化反应的顺利进行奠定了基础。     

脱漆剂在弹药表面维修处理中的应用

分析了目前弹药表面脱漆、除锈工艺存在的问题,介绍了碱性脱漆剂、酸性脱漆剂和溶剂型脱漆剂应用于弹药表面维修处理中的优缺点,讨论了温度、搅拌速率对脱漆速度的影响.结果发现,采用浸渍脱漆方法,不需要加热、搅拌,可常温脱漆,施工方法简单,安全环保,工作效率高,可在弹药维修机构推广应用.     

Optimizing the size of a CFRP patch to repair a crack in a thin sheet

One of the several techniques to repair cracks in structural sheets consist in bonding polymer composite patches. The effectiveness of the repair for restoring the quasistatic strength of the structure depends largely on the adhesively bonded interface. The interface fails due to interfacial separation caused by the high peeling and shearing stresses. The geometrical dimensions, that is, patch length and width, have significant effect on the interface separation and they need to be optimized. The failure strength of the patch was determined by a numerical analysis using the cohesive zone model. Twenty-five numerical analyses were carried out as per the L-25 Taguchi orthogonal array followed by ANOVA which indicated the greater contribution of the patch width toward the failure of the patch. The failure stresses thus obtained were used to generate a response surface in ANSYS Design Explorer Module. A design criterion in terms of the percentage increase of the failure stress over the yield stress of the skin was used for minimizing the area of the patch. The optimum length and width of the patch corresponding to the minimum patch area were obtained by plotting the response curves generated from the response surface.     

聚酯生产用催化剂特性及配制

介绍聚酯装置中催化剂的种类：锑系催化剂、锗系催化剂和钛系催化剂及它们在聚酯生产中应用的优缺点。对三氧化二锑的2种配制方式进行了比较,介绍了催化剂添加量和调配槽加热面积的计算方法。     

镍基海泡石催化剂制备方法与表面性质的研究

本文研究了不同的制备方法对镍基海泡石催化剂苯加氢活性的影响并用TPR、Ｈ２-ＴＰＤ、ＸＲＤ、ＸＰＳ、ＴＥＭ等方法表征了催化剂的表面性质。结果表明,焙烧温度及浸渍方式对催化剂活性的影响较大,其中以先浸Ｓｍ后浸Nｉ并在573K焙烧5ｈ所制得的催化剂效果最佳。海泡石及钐能提高镍的分散度,增加活性镍的比表面,同时具有给电子作用,使镍的电子云密度升高。     

Role of surface oxygen in the preparation and deactivation of carbon nanofiber supported cobalt Fischer–Tropsch catalysts

Surface oxygen groups on the carbon nanofiber surfaces are important for the preparation of highly dispersed cobalt catalysts and for the stabilization of the particles against sintering. However, the surface oxygen makes the catalysts easily deactivate during Fischer–Tropsch synthesis by oxidation of metallic cobalt. The activity could be recovered by re-reduction.     

飞机复合材料粘接修理技术及应用

介绍了飞机复合材料的粘接维修方法,重点介绍了胶粘剂的热固化、微波固化、电子束固化及光固化的工艺及设备。     

Use of electrochemical methods to examine different surface preparation methods for organic coatings on steel

For preparation of steel surfaces before applying an organic coating, waterjetting is a modern, effective and environmentally friendly method. However there is a lack of data on its performance in terms of the subsequent protection afforded by the paint compared with more conventional methods. Hence previously exposed steel panels had their surfaces prepared in a variety of ways (abrasion, blasting with garnet entrained in water (10 K psi) and waterjetting without garnet at two velocities (20 K psi and 40 K psi)) prior to coating with two typical maintenance coatings. These were then exposed under immersion condition in the laboratory and monitored using the DC resistance method. Another set of samples were exposed in a salt spray test in accordance with ASTM B 117 for 500 h. At the end of both tests DC measurements were carried out and the samples were inspected visually in terms of blistering and rust. Results showed that both the immersion test and the salt spray test differentiated the surface preparations methods in the same order. Thus control panels performed the best. Nearly as good though were the two (20 K psi and 40 K psi) sets of waterjetted samples. The abraded samples were variable but overall provided less protection. The panels blasted with garnet entrained in water (10 K psi) samples proved to be the worst. Characterisation of the surfaces prior to coatings using the scanning electron microscope was also conducted. A tentative explanation for the differing protection afforded involving the integrity of the oxide film was suggested. Further work is needed to substantiate this. Overall, with samples in the immersion test, results using electrochemical methods proved themselves to be very effective in assessing and even predicting performance in a relatively short period of time. The results also correlated with the salt spray test. Also the work showed that waterjetting is a very effective way of preparing the surface prior to maintenance painting.     

煤种及炭化条件对活性焦表面化学性质的影响

在不同煤种及炭化条件下,于一间歇流化床上制备活性焦(AC)。使用XPS等分析手段考察不同制备条件下制得的活性焦表面化学性质的差异。研究结果表明,煤种不同制得的活性焦的表面性质相差较大;炭化条件(炭化温度400—800℃、炭化时间0—60min)对最终制得的彬县煤活性焦表面化学性质影响很小。     

Development of a Fatigue Failure Model for the Adhesively Bonded Tubular Single Lap Joint under Dynamic Torsional Loading

The adhesively bonded tubular single lap joint shows nonlinear torque transmission capability and deformation characteristics under static torsional loading because of nonlinear properties of the adhesive. However, the dynamic or fatigue torque transmission capability can be calculated with linear, analysis because the stress-strain relation under torsional fatigue loading is linear, due to the small dynamic transmission capability compared with the static torque transmission capability.

In this paper, a failure model for the adhesively bonded tubular single lap joint under torsional fatigue loading was developed with respect to the adhesive thickness, which is the critical factor for the static torque transmission capability. Also, a design method for the adhesively bonded tubular single lap joint under torsional fatigue loading was proposed.     

国外生产环氧乙烷用催化剂载体的研制进展

本文叙述了国外制备环氧乙烷用催化剂载体的原料、制孔剂（烧出物）、粘结剂和制备方法，并列举了这种催化剂载体研制的例子。     

Development of a Fatigue Failure Model for the Adhesively Bonded Tubular Single Lap Joint under Dynamic Torsional Loading

The adhesively bonded tubular single lap joint shows nonlinear torque transmission capability and deformation characteristics under static torsional loading because of nonlinear properties of the adhesive. However, the dynamic or fatigue torque transmission capability can be calculated with linear, analysis because the stress-strain relation under torsional fatigue loading is linear, due to the small dynamic transmission capability compared with the static torque transmission capability.

In this paper, a failure model for the adhesively bonded tubular single lap joint under torsional fatigue loading was developed with respect to the adhesive thickness, which is the critical factor for the static torque transmission capability. Also, a design method for the adhesively bonded tubular single lap joint under torsional fatigue loading was proposed.     

新型井下固化下沉式缝高控制剂的研制

以有机硅、松香树脂、石英粉和陶粒等为原料,研制出一种新型双组分井下固化下沉式缝高控制剂。其中A组分为固体颗粒,B组分为液态固化剂;施工时将双组分混合均匀后,随携砂液注入井中,然后在井温条件下沉降固化。重点讨论了体系的初凝时间与温度的关系,以及B组分含量、井温和反应时间等因素对最终隔层强度的影响;利用显微镜技术观察了体系固化前后的微观结构变化,采用热重分析(TGA)法计算了液态B组分固化剂的利用率。结果表明:该缝高控制体系适用于井温为50～70℃的油井,得到的隔层可增加地层应力5～7 MPa,B组分的利用率为71.78%;该产品控缝效果良好,是一种应用前景较好的石油开采用缝高控制剂。     

表面改质机和微泡浮选机在司马矿选煤厂的应用

分析了司马矿选煤厂入浮煤泥的煤质资料;介绍了表面改质机和微泡浮选机的工作原理、技术参数,并与普通浮选法进行了对比实验;司马矿选煤厂的应用实践表明,该方法具有精煤产率高、生产成本低等优点,经济效益显著。     

Effect of surface preparation prior to cerium pre-treatment on the corrosion protection performance of aluminum composites

The effect of surface preparation prior to cerium treatment on the corrosion protection of AA6061 T6–10% Al₂O₃ in NaCl solution was investigated using electrochemical impedance spectroscopy and DC polarization techniques. A new surface preparation method consisted of pre-etching followed by oxide-thickening is proposed. Optical microscope and scanning electron microscopy showed a marked decrease in the number and depth of pits for the pre-etched as compared to the as-polished specimens. X-ray photoelectron spectroscopy revealed that pre-etching eliminated the active sites where the chloride ions can adsorb. Simultaneously, the adsorption of cerium ions is uniformly on the surface. The oxide-thickening step has a vital role in the protection mechanism. It was found that presence of a thick oxide layer completely changed the mechanism of protection.     

一种新型不锈钢常温化学除锈剂的研制

研制一种用于不锈钢表面锈蚀常温快速清洗的除锈剂,基础配方由盐酸和硝酸以18%∶18%的质量比组成,加入一定量的磷酸、柠檬酸、焦硝酸钠等,可以提高除锈效率和不锈钢的表面光亮度。研究十二烷苯磺酸钠、JFC渗透剂、乌洛托品的添加对除锈效果的影响,结果表明,配方中不宜添加十二烷苯磺酸钠,JFC渗透剂和乌洛托品的最佳添加量分别为1.5 g/L和6 g/L。