机载碳纤维雷达反射面天线的研制

简述了某型号雷达反射面天线的结构特点,并从材料选择、模具设计、天线结构优化和成型工艺等方面对天线成型进行了研究和讨论。采用热补偿方法对模具成型面进行了修补,利用正交试验设计对天线固化参数进行了优化。结果表明,天线厚度误差控制在±0.05 mm内,天线型面均方根差(RMSE)≤0.1 mm,天线副瓣电平为-30 db(34.468 GHz),结构、电气性能指标满足设计要求。     

低成本大口径碳纤维复合材料天线反射面制造及应用

通过对室温固化环氧树脂/碳纤维体系材料的选择和成型工艺的研究,采用室温湿法固化和真空袋压相结合的成型工艺成功制造出大口径碳纤维复合材料天线反射面,其成本较中温固化成型降低50%以上。该反射面已用于口径1.2m的车载抛物面天线,满足Ka及Ka以下频率的使用要求。     

碳/环氧复合材料C波段天线反射面研制

简述了碳/环氧复合材料C波段天线的组成,并对天线反射面制造工艺过程、材料选择及特性、铺层分析、成型模具设计、固化成型工艺参数选择、产品质量控制等内容进行了研究.结果表明:研制的某型号卫星蜂窝夹层结构复合材料抛物面天线的型面精度可控制在均方差精度为0.16 mm,经多次飞行试验考核,该天线各项指标均达到设计要求.     

碳纤维天线反射体制造技术

本文对天线反射体的原材料、模具、结构设计及成型工艺等方面进行了研究和讨论,并成功制做了高精度的碳纤维复合材料天线反射体.     

蜂窝预成型法制造蜂窝夹层结构件

采用蜂窝预成型方法制造了蜂窝A夹层结构制件,通过对外观、厚度、平拉强度和内部质量的检测,结果表明,蜂窝预成型方法能够有效地解决制件因成型压力过大而导致的蜂窝芯侧向塌陷问题,是一种非常有效的工艺方法。     

玻璃钢／聚氨酯泡沫塑料夹层结构两种成型工艺的比较

对玻璃钢／聚氨酯泡沫塑料夹层结构的两种不同成型工艺中的工艺方法、制件件重,模具制造及成本等方面进行了比较。     

多面体异型蜂窝夹层结构板整体成型技术研究

本文以某卫星收纳箱产品研制任务为背景,阐述了多面体异型蜂窝夹层结构板整体成型技术。首先介绍了产品结构特点,其次分别从工艺方案、成型工装设计与仿真分析、复合装配等方面进行了探究,最后从技术和质量方面进行了总结。结果表明,该整体成型技术方案可行,通过成型工装优化设计、蜂窝夹层结构外蒙皮整体成型与内蒙皮分瓣成型相结合的复合装配等成型技术,解决了收纳箱结构形面精度及拐角位置胶接质量难以控制的难点,制造的收纳箱产品内部质量和尺寸精度均满足设计指标要求。     

有关蜂窝夹层结构雷达罩工艺的几点看法

蜂窝夹层结构已成为雷达罩结构设计中广泛应用的重要材料。由于蜂窝夹层结构制造过程的复杂性和不可逆性，注重其工艺控制对产品质量的保证是非常重要的。本文介绍了蜂窝夹层结构雷达罩结构设计制造过程中，由工艺条件不当所产生的产品缺陷，重点分析了蜂窝芯子质量，蜂窝芯与面板胶接的质量，以及单元间的连接工艺质量等对蜂窝夹层结构雷达罩性能及产品质量的影响，并给出了一些建议。     

大型地面雷达天线罩的研制

介绍大型地面雷达天线阵列防护罩所用的材料及其制造工艺。首次采用低压共固化工艺成功地制造了大尺寸的Ａ型夹层结构雷达罩。结果表明，所选用的材料和工艺可行，雷达罩的整体性能和尺寸精度均满足性能指标要求。     

大曲率天线罩的研制

针对天线罩的结构特点,对制造的关键技术进行了研究。通过合理的选材,二次固化成型工艺,在严格控制工艺参数条件下,研制出了等厚度大曲率天线罩,其性能符合设计要求。     

Features of network formation in the chain crosslinking (co)polymerization

Summary Analysis of experimental results on the chain (co) polymerization of bisunsaturated monomers suggests that cyclization plays a decisive role already at the onset of the reaction. At medium and elevated concentrations of the bisunsaturated compound, compact microgel-like particles are formed, which give rise to a gel mainly by participating in the polymerization reaction only with pendant double bonds in their surface layer, and not with double bonds in the interior. This mechanism is reflected in an apparent decrease in reactivity of the pendant double bonds.     

近水平岩层边坡破坏模式试验研究

采用双层底面摩擦模型,研究近水平岩层边坡破坏模式,能体现出不同岩体在强度上的差异,得到近水平岩层边坡破坏为张裂缝—圆弧面—平面的边坡滑动破坏的基本模式。该底面摩擦模型试验现仍处在定性试验阶段。     

Fiber of bioinspired columnar cactus prickle-like structure for reinforced SiC aerogel: Thermal insulation and mechanical properties

The inspiration was obtained from the unique morphology of the columnar cactus prickle-like structure. Biomimetic fiber with a "double network" capability of reflecting heat radiation was prepared by electrospinning and hydrothermal methods. Among them, the first reflective network was TiO₂ nanorods grown in-situ on the fiber surface, and the second reflective network was TiO₂ particles embedded in the fiber. The bionic fiber was added to SiC aerogel as reinforcement to build composite aerogel. The results displayed that the "double network" reflecting ability of the bionic fiber can effectively shield the heat radiation conduction and thus reduce the effective thermal conductivity of the composite aerogel. The TiO₂ nanorods of the fiber surface not only reflected the heat radiation but also enhanced the fiber/aerogel interface bonding. In addition, the composite aerogel exhibited low thermal conductivity, high ablation resistance and high compressive strength.     

气体辅助注射成型流动分析模型

根据气体辐助注射成型流动过程的特点，从流体力学基本理论出发，引入合理的假设和简化，建立了熔体流动和气体穿透的数学模型，并在边界条件中反映出气体穿透和表面张力对熔体充填流动的影响。     

层状双羟基氢氧化物(LDH)的表面有机化研究

采用成核晶化隔离法合成MgAl CO32-型层状双羟基氢氧化物(LDH),并用不同偶联剂对其进行了表面有机化改性研究。通过X射线衍射(XRD)、红外光谱(IR)、X光电子能谱(XPS)、激光粒度分析和透射电镜(TEM)等手段探讨了偶联剂与LDH表面作用的原理。结果表明:硅烷偶联剂和铝钛复合偶联剂均可实现LDH的表面有机化,其中硅烷偶联剂AG 102的改性效果最好,而且用它改性的LDH在PVC中的团聚小,并具有较好的分散性,是一种理想的LDH表面改性剂。     

Transition from Mach to regular reflection and domains of various mach reflection configurations

Conclusions We have investigated different reflection configurations associated with the quasisteady reflection of shock waves from a plane corner in a shock tube.We have shown that a necessary condition for the inception of the transition configuration of Mach reflection and double Mach reflection is the existence of supersonic (relative to the triple point) flow behind the reflected shock wave.For strong shock waves the transition from Mach to regular reflection proceeds through the double Mach configuration. We have analyzed the transition process and proposed a strong-shock transition model.Graphs are presented, describing the inception of the various reflection configurations for shock waves in air and in nitrogen as a function of the impingent-wave Mach number and corner angle.Institute of High Temperatures, Academy of Sciences of the USSR, Moscow. Translated from Fizika Goreniya i Vzryva, Vol. 13, No. 1, pp. 102–110, January–February, 1977.     

Evaluation of the microporosity of pillared [Fe(CN)6]–MgAl–LDHs

Layered double hydroxides (LDHs) containing Mg²⁺ and Al³⁺ in the basic layers and NO⁻₃ as an interlayer anion were synthesized by the method of coprecipitation (pH 10). By changing the Mg²⁺/Al³⁺ ratio (1.5–4.5), the charge density on the (NO₃)–MgAl–LDH sheets was varied. After pillaring with Fe(CN)³⁻₆, which was based on an anion exchange process, the interlayer space became accessible. This was reflected in the large created surface areas and micropore volumes. The applied models for the calculation of the micropore size distributions (Maes–Zhu–Vansant and Horvath–Kawazoe) gave matching results, revealing narrow distributions for all the samples, with the majority of the pores smaller than 0.71 nm. A correlation was found between the Mg²⁺/Al³⁺ ratio and the resulting microporosity after pillaring. The optimal ratio was situated around 3.3, resulting in a pillared [Fe(CN)₆]–MgAl–LDH with a Langmuir surface area of 499 m²/g and a micropore volume between 0.158 ml/g (μPV_min) and 0.177 ml/g (μPV_max). As an alternative, direct coprecipitation of the pillared LDHs was evaluated. This one-step mechanism proved to be a method producing similar results. Taking all this into consideration, one can conclude that hexacyanoferrate(III) complexes form ideal anionic pillars for the creation of microporous layered double hydroxides.     

氮化硼表面修饰及其对氮化硼/硅橡胶复合材料热性能的影响

研究氮化硼表面改性及其对氮化硼/硅橡胶复合材料热性能的影响。结果表明:活化可以提高氮化硼表面接枝率,偶联剂CA1对氮化硼的改性效果优于偶联剂KH570;随着氮化硼用量的增大,氮化硼/硅橡胶复合材料的热导率增大;加入氮化硼的复合材料热稳定性提高,但改性氮化硼/硅橡胶复合材料的热稳定性下降。     

集成橡胶SIBR臭氧老化过程的研究

本文跟踪考察了集成橡胶SIBR的臭氧老化过程,并对老化过程中微观结构及其样品表面臭氧龟裂的变化规律进行了研究。结果表明：在臭氧老化过程中SIBR分子链中双键含量减少,并且伴有羰基结构的产生。双键和羰基结构的变化趋势与丁苯橡胶SBR相似,老化后期均趋于平缓。未填充和填充SIBR产生臭氧龟裂的初裂时间均居于丁苯橡胶SBR和异戊橡胶IR之间,但是发生初裂之后,未填充和填充SIBR表面裂纹的增长速度均较慢。经臭氧老化后,SIBR的力学性能变化率均较低,由此说明,SIBR的耐臭氧老化性能优于SBR和IR。     

基于响应曲面法的磷酸分解磷矿研究

以云南富藏的磷矿资源作为研究对象,考察了磷酸浓度、液固比和温度对磷矿转化率的影响.通过响应曲面实验设计(RSM),建立了磷酸分解磷矿过程的回归模型,该模型较好地反映了磷矿转化率与磷酸浓度、液固比和温度之间的关系;利用该模型优化得到分解最佳工艺条件为温度110 ℃,液固比9,磷酸浓度42%(P2O5计),在此工艺条件下磷矿转化率达99.29%,与模型预测值相对误差<1%,表明所得模型可以精确反映参数之间的相关关系,可以用于磷矿分解过程的预测与优化.