Al2O3 陶瓷墨水的乳化分散制备工艺

以纳米α-Al2O3为原料,用乳化分散法制备Al2O3陶瓷墨水,探讨了制备工艺条件对墨水理化性能的影响.结果表明,以异丙醇/乙醇二元混合溶液为溶剂,通过选择分散剂品种、控制分散剂用量、乳化剪切转速、分散时间、固相含量等条件,可制备出分散稳定性良好的Al2O3陶瓷墨水.打印实验证明乳化分散法制备的Al2O3陶瓷墨水能够满足喷墨打印的要求.     

Sb掺杂量对ATO半导体颜料涂层光学性能的影响

采用共沉淀法合成了ATO半导体颜料的前驱体,前驱体经过烧结获得半导体颜料,通过XRD、SEM、EDS等手段对颜料进行表征,研究了Sb掺杂量对ATO半导体颜料粉体电阻率和涂层光学性能的影响。研究结果表明,Sb掺杂量对颜料的粉体电阻率和涂层光学性能影响明显,当Sb掺杂量为6%（质量分数）时,制备的颜料粉体电阻率为15.4Ω.cm,涂层红外发射率仅为0.71。     

化学合成与机械球磨制备的纳米颗粒润滑性能对比*

机械球磨和化学合成法制备的矿物纳米颗粒在化学组成、粒径分布和颗粒形状等方面存在显著不同,为研究2种方法制备的纳米颗粒对抗磨减摩性能的影响,采用环块式摩擦磨损试验机对比分析不同方法制备的纳米蛇纹石颗粒与纳米高岭土颗粒的摩擦学性能。试验结果表明：粒径为200~800 nm的合成纳米蛇纹石的摩擦因数和磨损量最低,球磨高岭土的摩擦因数和磨损量最大;合成纳米蛇纹石颗粒和有机钼减摩剂（MoDTC）复配能够进一步提高润滑性能,在110~130 ℃温度下,相比纯合成纳米蛇纹石颗粒,复配润滑油的摩擦因数降低约52%,相比MoDTC,复配润滑油磨痕宽度减少约13%;150 ℃试验温度下,合成蛇纹石、球磨蛇纹石、合成高岭土与MoDTC复配促进摩擦表面MoS2的生成,进一步降低摩擦因数;合成纳米颗粒形状圆润,没有尖锐棱角,对摩擦表面犁削作用小,相比球磨颗粒具有更好的抗磨减摩效果。     

傅立叶变换显微红外光谱法无损鉴别黑色中性笔色痕

黑色中性笔墨水主要由溶剂、色料、增稠剂、稳定剂和其他添加剂等组成,不同厂家或同厂家不同牌号中性笔墨水的成分不同,这为中性笔墨水的种类鉴别提供了依据.本文建立了一种傅立叶变换显微红外光谱法((FT-IR Microgpectrometry)无损鉴别黑色中性笔色痕的方法,可直接鉴别纸张上黑色中性笔色痕,具有快速、准确、灵敏度高,不破坏样品等特点.     

纳米墨水

一张张精美的图片，清晰度、色彩饱和度均和原装彩色墨水相差无几……我国青年科技人员李昂工程师等人经过3年努力，日前成功研制出颜料颗粒最大直径仅为200纳米的彩色墨水，从而使国产墨水具备了替代进口墨水的可能。     

基础油复配复合锂基脂的制备及性能研究

为提高复合锂基脂的高温性能,以500SN矿物油和甲基苯基硅油为复合基础油,以12-羟基硬脂酸、癸二酸、一水氢氧化锂等为稠化剂原料制备复合锂基润滑脂,考察基础油含量、种类及复配比对润滑脂性能的影响。确定润滑脂的最佳配方,并对润滑脂进行热分析和扫描电镜测试和四球摩擦试验。结果表明:当基础油质量分数为86%时,所制备润滑脂综合性能更优;甲基苯基硅油所制备的润滑脂综合性能明显优于矿物油润滑脂;矿物油与甲基苯基硅油复配比例为4∶6时,所制备润滑脂具有较高的滴点;热分析、扫描电镜测试和四球摩擦试验均证明所制润滑脂高温性能良好、减摩抗磨性能优良。     

CNT/PDMS柔性传感材料的打印工艺及性能研究

针对复合导电材料CNT/PDMS应用于柔性传感以及复杂结构设计的需求,将直写打印技术与该复合导电材料的成型制备方法结合起来,研究了CNT/PDMS复合材料的打印工艺和电阻传感性能。在试验研究中,首先配置了不同CNT含量的打印墨水,并对打印墨水的流变性及材料导电性进行测试,试验结果表明配置的打印墨水均具有粘弹性以及剪切变稀的性质,其中以CNT质量分数为7%的墨水用于直写打印时兼具导电性好易挤出且成型好的特点。通过单点成线试验,设置3D打印机参数为:扫描速度为10mm/s,挤出气压为0.3MPa。在此基础上,进行简单平面条状、二维网状结构以及立体网格结构的打印,对打印的条状结构进行温度和单轴拉伸试验,在不同的温度和拉伸率下打印件均表现有电阻传感特性;对网格状电路进行柔性电路性能测试,在对其施加6 V左右电压时,无论网格电路处于伸展还是弯曲状态均能表现出良好的导电性能;对打印的立体网格结构进行压力传感试验,结果表明复合材料有良好的压敏特性。性能表征结果证明该打印工艺可行,从而为后续该材料的复杂结构制造以及在柔性传感电子设备中的应用奠定基础。     

利用钢渣和粉煤灰烧结制备微晶玻璃工艺的优化

利用钢渣和粉煤灰化学组成的互补性,采用烧结法制备了以透辉石为主晶相的微晶玻璃;通过正交试验研究了各主要工艺参数对微晶玻璃性能的影响,并得出最优的工艺参数.结果表明:影响微晶玻璃抗弯强度的工艺因素的主次顺序为烧结时间、晶化温度、晶化时间、烧结温度;最佳的工艺参数为晶化温度790℃,晶化时间1.5 h,烧结温度1 115℃,烧结时间2 h;制备的微晶玻璃完全能满足建筑材料的性能要求.     

4D打印液晶弹性体工艺及其性能研究

液晶弹性体(Liquid crystal elastomers,LCEs)因其大且可逆的变形、响应速率快、优异的力学性能、各向异性以及驱动条件简单灵活等特点,在智能构件制造领域被认为具有广泛的应用潜力.为了提升液晶弹性体的成形能力,丰富液晶弹性体的变形模式及其设计方法,提出了利用墨水直写打印工艺编程液晶弹性体复杂变形模式的方法.制备了最大变形率达51％的主链型液晶弹性体,研制适合打印工艺编程的气压挤出高温墨水直写打印设备,探索了墨水直写打印工艺对液晶弹性体性能的影响规律.发现打印速率对液晶弹性体的变形率具有显著影响,随着打印速率的增大,变形率从12％逐渐增大到最大变形率51.8％后不再变化.此外,打印温度可使液晶弹性体的变形率在38.3％～51％之间变化,紫外光照时间可使凝胶分数最高到62.2％,而打印与紫外光照的间隔时间对材料的变形率没有影响.最后通过打印速率编程液晶弹性体弯曲行为,实现了液晶弹性体变形模式和行为的精确控制,证明了墨水直写打印工艺编程液晶弹性体复杂变形模式方法的可行性.     

焊膏用水溶性免清洗助焊剂的研究

选用水溶性物质作为制备助焊剂的原料;以有机酸和有机胺复配为活性组分并采用丙烯酸树脂对其进行微胶囊化包覆处理;采用正交试验优化助焊剂配方,并进行回流焊接模拟.结果表明：复配活性物质可以调节焊剂pH值接近6且不降低活性.微胶囊化处理可以很好的消除腐蚀.该焊剂制备的焊膏焊接性能良好、存储寿命长.焊后残留少、无腐蚀、易水洗,焊点饱满、光亮,焊层薄而明晰.     

Silica Pigments for Glossy Ink Jet Media

Silica is a versatile pigment for ink jet media. Micronized silica gel is the worldwide standard for high performance matte ink jet media. For glossy ink jet media, several different forms of silica are widely used. Submicron silica gel dispersions, with either anionic or cationic surfaces, can be employed in either absorptive basecoat layers or in the glossy ink receptive top layer. Colloidal silica, with a variety of particle sizes and surface modifications, is utilized extensively in glossy top layers. It will show how various silica pigments can be utilized in glossy ink receptive coatings, both in cast based glossy media and RC based glossy media. Several novel silica pigments will be examined by relating the physical properties of the pigments and the formula variables to the print quality of the ink jet media.     

Tribological Properties and Film Formation Behavior of Thermoreversible Gel Lubricants

The tribological properties of a new and unique thermoreversible gel lubricant (TR gel lube) were investigated. TR gel lube, which includes 10–40% of amide-type gelling agent in base fluid, is able to repeatedly alter or convert phase from gel state to liquid state at the melting point of the gelling agent. High-pressure rheological tests were performed in order to characterize the behavior of base oil and TR gel lube as a function of pressure and temperature. The effect of TR gel lube on ball bearing fatigue life was carried out by systematic tests using thrust ball bearings. The results of L ₁₀ life tests of TR gel lube showed a longer life than the conventional greases. This result was investigated from the oil film formation. It was found that the gelling agent played a key role in the lubricating properties. Some mechanisms such as adsorbed film formation and solid-like formation are proposed.     

Rheological behavior’s effect on the work performance of oil film

A 3D model of hydrostatic turntable’s oil chamber is established to investigate the lubricants performance with different rheological properties by using FLUENT software and the finite volume method. Newtonian oil and non-Newtonian oil’s performance under varied speeds are compared on the large size hydrostatic turntable system considering the temperature-viscosity relationship and pressure-viscosity relationship. The results show that the property of non-Newtonian fluid viscosity influenced by shear rate largely affects the lubricants performance for most oil added polymer additives. Lubricants cannot simply be regarded as Newtonian fluid. The shear thickening non-Newtonian fluid has a better work property. The results are important to design a large size and high-speed hydrostatic support system, choose lubricant oils, and investigate oil film’s work properties.     

面向吞咽障碍的大豆蛋白增稠剂润滑特性研究

为探究大豆蛋白作为面向吞咽障碍患者的食品增稠剂可行性,基于流变学及摩擦学的评定方法,采用MCR301流变仪测试不同质量分数大豆蛋白溶液的流变特性,在MFT-5000磨损试验机上开展软摩擦条件下不同滑动速率时大豆蛋白润滑特性研究,并与常见的淀粉类、黄原胶类增稠剂的特性进行比较。结果表明：大豆蛋白溶液表现出弱凝胶的性质,其溶液黏度随着大豆蛋白质量分数的增加而增大,且经人工唾液稀释后溶液仍保持较高的黏度;在口腔软摩擦的环境下大豆蛋白溶液表现出较好的润滑特性,其摩擦因数随着大豆蛋白质量分数的增加而有所降低;与淀粉类及黄原胶类增稠剂相比,大豆蛋白溶液具有更低的摩擦因数,其研究结果为吞咽障碍的功能食品开发提供了参考。     

Investigating Corrosion Performance and Corrosive Wear Behavior of Sol–gel/MAO-Coated Mg Alloy

In this study, a hydroxyapatite composite coating was prepared by a sol–gel technique on the micro-arc oxidation (MAO)-coated AZ31 Mg alloy to seal the micro-pores. The composite coating achieved a larger hardness value and two times thickness more than pure MAO coating. The corrosion and wear resistance of the sol–gel/MAO coating in simulated body fluid were investigated compared to MAO coating. It was found that the composite coating presented a positive corrosion potential and a lower corrosion current density than MAO coating. The sol–gel/MAO composite coating could provide more effective barrier against corrosive ions than single MAO coating for AZ31 alloy. In the wear tests, a ball-on-disk tribometer was used to study the effect of loads on the wear properties of the coatings at 37 °C. The wear resistance of sol–gel/MAO composite coatings was apparently superior to MAO coating. The wear mechanisms of abrasion and adhesion in composite coatings are investigated. Finally, two physical models for the corrosion and sliding wear mechanisms of sol–gel/MAO composite coatings are proposed, respectively.     

高低温性能优良的膨润土润滑脂的研制

以季铵盐改性膨润土为稠化剂,酯类油为基础油,乙醇为助分散剂,添加极压、抗磨、防腐、抗氧等添加剂,制备一种高、低温条件下性能优良的膨润土润滑脂.用扫描电子显微镜观察脂的微观结构,研究助分散剂对脂结构及脂稠度的影响.各项性能测试结果表明:制备的膨润土润滑脂具有良好的低温性能、胶体安定性、氧化安定性、防腐性和极压抗磨性.     

化学镀/浸渍提拉复合法制备TiO2光催化膜

先采用化学复合镀法在铁丝网上制备出Ni—P—TiO2薄膜，再将其浸入溶胶一凝胶法制得的TiO2前驱体凝胶中，利用浸渍提拉法制备出纳米TiO2复合薄膜。研究了单纯复合镀法、单纯溶胶一凝胶提拉法以及化学镀一提拉复合法3种制备方法获得的膜层组织以及对耐蚀性和光催化性的影响。结果表明，化学镀膜的耐蚀性好但光催化性略差，提拉膜的光催化性好但耐蚀性较差，而化学镀一提拉复合法制备的纳米TiO2薄膜具有耐蚀性和光催化性俱佳的效果。     

New correlations for better monitoring the all-oil mud rheology by employing artificial neural networks

The rheological properties of the drilling fluid are crucial to the success of the drilling project. The traditional mud experiments normally performed by the mud engineers provide rheological data with a small resolution. Monitoring higher-resolution rheological properties is particularly important for all-oil mud because it is widely used with problematic drilled formations. The design and monitoring of the drilling fluid rheology is a critical issue for drilling, and therefore, this paper is a contribution to the effort to completely automate the process of highly accurate and real-time recording of the rheological mud properties. This paper aims to develop intelligent predictive models for the mud rheological properties using artificial neural networks [ANN] by linking the high-frequency mud parameters such as fluid density or mud weight [MWT] and Marsh funnel viscosity [MFV] with the rheological measurements of low frequency for drilling mud such as plastic viscosity [PV], yield point [YP], behavior indicator [n] and viscosity appearance [AV]. New empirical correlations have additionally been established to assess the rheological properties of water. In order to construct ANN models, data was obtained from 56 different wells during drilling operations of different drilling sections with various sizes. The data was fairly enough for building and testing the models as 369 data points were obtained. The models were optimized by trainlm which was the best training function and tansig was the best transfer function. 42 neurons in the hidden layer optimized AV and PV models where 34 neurons optimized all other rheological models [YP, n, R300, and R600]. ANN models presented good results as correlation coefficient [R] was 0.9 and an average absolute [AAPE] error of less than 8% for training and testing data sets. The new models were used to derive the empirical correlations for the estimation of rheological parameters. The empirical correlations were extracted to easily monitor the rheological properties of an all-oil mud system in real-time, which enables better control of the drilling activity by maintaining rheological properties at optimal values as well as early detection of other problems that might require immediate interactions, including well control and stuck pipe.     

Effective transmission screw nuts of steel backing/self-lubricating composite lining fabricated by injection molding

To increase transmission efficiencies and bearing abilities of sliding screw pairs, a new type of screw nuts and their fabricating method were put forward. The nuts have the structure of steel backing/self-lubricating composite lining with the advantages of high bearing capacity and low friction coefficient. The lining material was composed of epoxy as the matrix and some additives: carbon fiber, graphite, MoS₂, firming agents and coupling agents etc. A suitable formulation was determined by experiments to meet lining requirements: high bounding strength, sufficient mechanical properties and good tribological properties. An injection molding set for fabricating the nut linings was designed and made to achieve even lining thickness along the thread surfaces during molding. Lubrication grooves on the nut thread surfaces were created during molding. In comparison with bronze ZQSn6-6-3, the friction coefficient of the composite nuts was reduced by 35% and the transmission efficiency increased by 30%.