柔性复合高压输送管在油田的应用

介绍了柔性复合高压输送管的结构和性能特点。选取φ128mm×13 mm和φ106mm×18 mm 2种规格管材进行了质量评价,在此基础上选取了2条含油污水输送管线进行了现场试验。结果表明,该柔性复合高压输送管质量符合石油行业标准。     

Ф2800mm全夹套造气炉浅析

我公司是一家年产总氨250 kt、尿素350 kt的中型氮肥企业,现有2 610 mm造气炉9台、2 600 mm/2 800 mm锥形造气炉4台、2 800mm直筒式全夹套复合造气炉5台。5台2 800mm全夹套复合炉自2007年4月投入运行已2 a多,现结合其运行情况对2 800 mm全夹套复合造气炉做一探讨。1同普通造气炉相比全夹套复合炉的优越性1·1明显提高了应用劣质煤的能力劣质煤制气在实际操作中表现为发气量低,炭层难降。     

φ2 800 mm全夹套造气炉浅析

我公司是一家年产总氨250 kt、尿素350 kt的中型氮肥企业,现有φ610 mm造气炉9台、φ12 600 mm/φ2 800 mm锥形造气炉4台、φ2 800mm直筒式全夹套复合造气炉5台.5台φ2 800mm全夹套复合炉自2007年4月投入运行已2 a多,现结合其运行情况对φ2 800 mm全夹套复合造气炉做一探讨.     

TEOS/异丁基三乙氧基硅烷复合乳液对带损伤水泥基材料的防护

以异丁基三乙氧基硅烷和正硅酸四乙酯(TEOS)为主要原料,制备了TEOS/异丁基三乙氧基硅烷复合乳液(简称复合乳液),并对比研究了复合乳液、异丁基三乙氧基硅烷乳液、TEOS三种材料对水泥基材料在出现磨损(5 mm范围内)和裂缝(0.1 ～0.5 mm范围内)损伤后防水效果的影响.结果 表明,复合乳液、异丁基三乙氧基硅烷乳液对出现损伤后的水泥基材料具有很好的防水效果,TEOS的效果较差.当再生混凝土磨损深度达到5 mm时,涂覆复合乳液的试块比未磨损试块的吸水系数分别降低了45.8％(C40)和54.6％ (C50).涂覆复合乳液后,即使水泥基材料出现0.2 mm和0.5 mm裂缝,试块的毛细吸水系数也比未涂覆时分别降低了74.8％和70.1％.     

GF/碳酸钙复合改性PS选择性激光烧结实验

针对选择性激光烧结工艺中聚苯乙烯(PS)粉末烧结件强度不足的缺点,通过添加玻璃纤维(GF)粉末和碳酸钙粉末制备PS/GF/CaCO_3复合粉末来提高烧结件强度。采用单因素实验法、弯曲强度测试和扫描电子显微镜分析探索了PS/GF/CaCO_3复合粉末烧结件成型的不同工艺参数范围,研究了不同工艺参数对烧结件弯曲强度的影响。结果表明,分层厚度在0.18~0.22 mm范围内,扫描间距在0.25~0.29 mm范围内,扫描速度在1 500~1 800 mm/s内可以确保PS/GF/CaCO_3复合粉末烧结件成型;分层厚度为0.18 mm,扫描间距为0.25 mm,扫描速度为1 500 mm/s时,PS/GF/CaCO_3复合粉末烧结件弯曲强度最高,可达10.94 MPa;在PS/GF/CaCO_3复合粉末烧结件成型的工艺参数范围内,随着分层厚度、扫描间距、扫描速度的增大,弯曲强度降低。     

复合塔传质性能研究

本文采用空气-水系统进行冷模实验,在内经250mm的有机玻璃塔中,对孔径为7mm的穿流塔与复合塔进行流体力学和传质性能研究。复合塔分两种,穿流筛板下加一层厚为25～60mm的拉西环填料,浮阀板与拉西环填料组成。实验结果表明,复合塔具有较大的操作弹性,板压降小,雾沫夹带量极小,传质效率高的特点,全塔效率与高效填料塔相当。     

聚四氟乙烯缠绕吹胀成型制品与橡胶复合的技术

介绍利用聚四氟乙烯车削薄带缠绕吹胀成型方法,加工直径 14 7mm,长 180mm,波峰半径 30mm的波纹管与橡胶复合制品的制作过程。     

金属波齿复合垫片结构参数和力学性能关系的试验研究

对柔性石墨金属波齿复合垫片的结构参数和力学性能的关系进行了较系统的试验研究,结果表明采用不锈钢为骨架,齿距在3～5mm,柔性石墨密度在1．1g／cm3左右,柔性石墨覆层厚度在1．3mm左右的复合垫片具有较好的力学性能。     

石墨烯抗菌牙刷丝的制备及其性能研究

以石墨烯为抗菌剂,聚对苯二甲酸丁二酯(PBT)为主要原料,制备了石墨烯-PBT复合抗菌牙刷丝,研究了石墨烯添加质量分数对牙刷丝物理性能和抗菌性能的影响.结果表明:当石墨烯质量分数为0.05％时,石墨烯-PBT复合抗菌牙刷丝毛束弯曲应力为4N,末尾丝径为0.01 mm,椎体高度为5mm,磨尖率为98％,而且该复合牙刷丝对...     

热和枪击复合环境试验中PBX-2炸药的响应特性

为研究炸药在热和枪击复合环境下的安全性,采用在枪击试验样品上增加加热系统的方式,对Φ75 mm×150 mm PBX-2炸药进行了模拟复合环境试验.试验过程中采用热电偶测试样品内不同位置的温度变化过程,通过冲击波超压测试分析了炸药的反应程度,获得了PBX-2炸药在热和枪击复合环境试验中的响应特性.结果表明,热和枪击复合环境试验中PBX-2炸药的反应程度基本一致,建立的热和枪击复合环境试验方法,为评估炸药在异常环境下的安全性能提供了一种新的技术途径.     

铺层结构对三维中空夹层复合材料压缩性能的影响

采用手糊成型制备了双夹层三维中空夹层复合材料,重点研究了厚度为5 mm和8 mm的三维中空织物ZK5和ZK8铺层顺序对复合材料压缩强度的影响,并从树脂含量、织物厚度匹配性角度进行分析。结果表明,随树脂含量增加,三维中空夹层复合材料的压缩强度明显提高;双夹层三维中空夹层复合材料中,下层的树脂含量明显高于上层;ZK5和ZK8织物铺层顺序对双夹层中空复合材料的压缩强度影响较大,其中将ZK8置于ZK5下层时复合材料的压缩强度为ZK8置于ZK5上层时的1.7倍,即在三维中空夹层复合材料总厚度不变的情况下,将高厚度中空织物置于下层的结构明显优于将其置于上层的结构。通过这一概念可以在保证三维中空夹层复合材料整体厚度尺寸不变、质量不增加的条件下通过铺层结构的匹配设计,最大限度地提高复合材料的力学性能。     

Study on Rubber Composite Armor Anti‐Shaped Charge Jet Penetration

The process of rubber composite armor anti‐shaped charge jet (SCJ) penetration was divided into four parts based on jet deformation that occurred when the SCJ penetrated the rubber composite armor. Results on the interference speed interval, interference frequency, and surplus penetration capability of the SCJ with the rubber composite armor were derived based on the stress wave and the Kelvin‐Helmholtz instability theory. The effects of rubber layer thickness and obliquity of the armor for the composite armor anti‐SCJ penetration were studied through theoretical, X‐ray, and depth of penetration experiments. The results showed that when the obliquity was at 60° and the rubber layer thickness was in the range of 3 mm to 3.5 mm, the rubber composite armor seriously disturbed the stability of the SCJ. Thus, the rubber composite armor was found to have the best protection capability under these specifications.     

Dielectric and microwave absorption properties of CB doped SiO2f/PI double-layer composites

Carbon black (CB) with contents of 5.5?wt% and 15?wt% filled quartz glass fiber reinforced polyimide (SiO_2f/PI) composite were designed and prepared. A double-layer absorbing material was designed using the two composites materials as a matching layer and an absorption layer, respectively. The microwave absorption property of single-layer and double-layer composites is calculated according to transmission line theory. The results show that the microwave absorbing property of double-layer composite is better than that of single-layer at the same thickness. When the 5.5?wt%CB doped SiO_2f/PI composite is used as the matching layer with a thickness of 0.7?mm and 15?wt%CB doped SiO_2f/PI composite is used as the absorption layer with a thickness of 0.9?mm, the RL (reflection loss) of the composite reaches a minimum value of ?46.18?dB at 16.07?GHz. Meanwhile, the bandwidth of RL?≤??5?dB is 5.87?GHz and the bandwidth of RL?≤??10?dB is 3.95?GHz.     

装饰材料用阻燃柔性复合薄木的制备及力学性能

以厚度为0.35～0.40 mm的榉木为薄木基材、棉网格布为增强材料和PES(聚醚砜)型HMA(热熔胶)为胶粘剂,选用BL-环保阻燃剂制备装饰材料用阻燃柔性复合薄木;然后以拉伸强度、剥离强力和表观性能为衡量指标,以热压压力、热压温度、含水率和胶膜厚度为试验因素,采用正交试验法优选制备柔性复合薄木的最优方案。结果表明:以PES型HMA作为薄木/棉网格布复合用环保型胶粘剂,其不仅与BL-环保阻燃剂有很好的相容性,而且可避免脲醛树脂胶粘剂的甲醛释放等问题;增强型薄木与非增强型薄木相比,前者的横纹拉伸强度显著提高,并且前者不再表现为脆性特征;柔性复合薄木热压工艺条件的最优方案为热压压力0.7 MPa、热压温度125℃、含水率12%和胶膜厚度0.10 mm。     

HTPB/AP复合推进剂装药直径对冲击波点火的影响

为研究HTPB／AP复合推进剂装药直径对冲击波点火的影响作用,用隔板实验测试了不同装药直径对冲击波点火临界燃烧厚度及峰值压力的影响。确定了最佳药柱直径,并对其点火可靠性及药柱受冲击波点火后密度变化进行测试。结果表明,药柱直径与临界燃烧隔板厚度及冲击波强度有着密切的关系。密度为1．563g／cm^3时,HTPB／AP复合推进剂的最佳冲击波点火推进剂装药直径为40mm,且冲击波点火可靠性良好,药柱受冲击波作用后,密度发生一定变化。     

柔性石墨金属波纹复合增强垫片密封性能试验

在全自动垫片综合性能试验台上分别进行了316L和A3钢作为骨架材料的金属波纹复合垫片的泄漏率、压缩回弹性能和应力松弛试验,考察了柔性石墨覆盖层厚度、骨架材质和垫片应力对垫片密封性能和力学性能的影响,分析了不同覆盖层厚度和垫片应力下的金属波纹残余高度。结果表明:覆盖层厚度对垫片的密封性能有重要影响,厚度为0.6 mm时该类垫片的综合性能最佳;金属波纹复合垫片具有良好的承载能力和密封性能,尤其适宜压力波动、温度剧变等场合的密封,预压缩处理更能真实反映出复合垫片优异的回弹性能;此外,与A3钢作为骨架材料的复合垫片相比,316L复合垫片的密封性能和压缩回弹性能随垫片应力的增加逐渐显现,且其抗松弛能力和抗蠕变性能也得到了显著提高。     

Enhanced microwave-absorption properties of polymer-derived SiC/SiOC composite ceramics modified by carbon nanowires

Novel microwave-absorbing SiOC composite ceramics with dual nanowires (carbon nanowires (CNWs) and SiC nanowires) with high performances were fabricated by using the polymer-derivation method and heat treatment in Ar atmosphere. The introduction of CNWs in the amorphous SiOC ceramics promotes the ceramic crystallization into SiC nanoparticles and SiC nanowires at lower annealing temperatures, which leads to multi-phases and multiple nano heterogeneous interfaces. The distinctive architectures largely increase the interfacial and dipole polarizations of the composite ceramics. The CNWs/SiC/SiOC composite ceramics exhibit excellent microwave-absorption properties in the Ku band (12.4–18 GHz). The minimum reflection coefficient (RC) is -24.5 dB at a thickness of 1.8 mm, while the maximum effective absorption bandwidth (EAB, the corresponding frequency band in which RC is smaller than -10 dB) is 4.8 GHz at a thickness of 1.9 mm, which make the CNWs/SiC/SiOC composite ceramics promising electromagnetic-wave-absorbing materials.     

针刺用炭布／网胎复合织物单层增厚及变形性分析

炭布／网胎复合织物是C／C复合材料针刺预制体的一种重要原料。本文研究了针刺后不同种类炭布／网胎复合织物的单层增厚及针刺变形性。单层增厚与针刺后复合织物的结构、织物的厚度均匀性和针刺密度有关。针刺后复合织物的结构为“销钉”结构,织物的厚度均匀性影响Z向纤维的引入量,针刺密度是影响单层增厚最为显著的因素。针刺密度为20针／cm^2时,预氧丝网胎复合织物的单层增厚小于0．2mm,增厚百分比在4％～25％之间;针刺密度为32针／cm^2时,炭纤维网胎复合织物的单层增厚在0．14mm-0．23mm之间,增厚百分比在16％～34％之间。不同种类炭布／网胎复合织物的整体变形性较为相似,针刺变形性与炭布的结构有关。     

Highly Improved Microwave Absorbing and Mechanical Properties in Cold Sintered ZnO by Incorporating Graphene Oxide

The abruptly increased dielectric loss in graphene oxide (GO) induced by high-temperature sintering has prevented GO from being used as an absorbent in ceramic-matrix microwave absorbing composites (MACs). Here, we show the first example that the pristine structure of GO can be largely preserved in ceramic composite by using cold sintering technology. Compared with the composites densified by ordinary spark plasma sintering, cold sintered samples possess lower complex permittivity and superior impedance matching. Therefore, the cold sintered ZnO composite with 0.50 wt% GO loading shows the minimum reflection loss of -47.5 dB at thickness of 3.2 mm, and the effective absorption bandwidth of 4.4 GHz at thickness of 1.7 mm. Moreover, both flexural strength and hardness of the cold sintered composite are improved considerably compared to the monolithic cold sintered ZnO. These findings imply that cold sintering enables the thermally unstable materials to be applied in highly effective MACs with robust mechanical performance.