在涂料和型砂中气化模材料热裂解产物的分析研究

通过有机化合物波谱分析的方法，对气化模材料热裂解后进入涂料和型砂中的产物进行了分析研究。结果表明，这些裂解产物的组成非常复杂，有芳香烃，高级烷烃、烯烃和酯类等。根据这些结果，对聚苯乙烯热裂解机理进行了初步探讨。     

磁型铸造用低密度气化模

磁型铸造时,浇注的液态金属将气化模烧毁,从而取代了模型的位置,凝固成铸件。根据这一特点,磁型铸造对气化模的主要要求是:气化模遇到液态金属时能按照所要求的速度及强度气化;发气量要低;残留物应最少。那种材料适合上述要求呢?可以考虑的材料是某些泡沫塑料,例如泡沫环氧、泡沫酚醛、泡     

气化模铸造空心凸轮轴浇注系统的实验研究

本文通过对气化模铸造空心凸轮轴浇注系统的类型和浇注方式进行实验研究，得出气化模铸造生产空心凸轮轴宜采用封闭式浇注系统，立式浇注；同时发现真空度对充型速度有较大影响，抽真空方向对铸件的冷却速度也有影响，为气化模铸造浇注系统设计提供了试验数据。     

气化模铸钢件增碳的影响因素及解决措施

讨论了气化模铸钢件增碳的影响因素,铸件表面增碳与钢液成分、铸件壁厚、铸件冷却速度、涂料层厚度及其透气性、负压度、模样材料、浇冒口工艺、排气方法、浇注位置的选择,甚至和钢液的浇注温度、速度等都密切相关,其表面增碳程度,主要取决于泡沫模样分解产物中的碳与钢液中碳的浓度梯度。提出了解决铸钢件增碳的综合优化措施及气化模生产铸钢件的范围。     

中小件气化模铸造浇冒口系统设计CAD

在试验研究的基础上，建立了中小件气化模铸造典型工艺数据库，研制开发了中小件气化模铸造浇冒口系统软件──EPCAD。该软件通过与典型工艺数据库的接口，充分利用已有经验进行设计，提高设计效率。     

气化模粘接剂的选用及其改进

气化模的粘合是气化模铸造的关键技术之一,使用粘接剂的性能４必须满足生产的要求,本文介绍了各种粘接剂的特性及其选用,以及自行研制的ＥＳＳ热溶胶的配方及性能,还介绍了用呋喃树脂配制的双组分粘接剂及加快乳白胶固化速度的方法。     

气化模铸造空心凸轮用涂料性能的研究

在气化模铸造中，涂料是关键的基础技术之一，本文研究了气化模铸造空心凸轮轴专用涂作用、性能及应用，实践表明，应用该涂料可获得令人满意的铸件表面质量和尺寸精度。     

中小铸钢件气化模铸造浇冒口系统计算机辅助设计

通过建立中小铸钢件气化模铸造典型工艺数据库保存和管理现有的生产经验，在此基础上研究开发了适用于中小铸钢件气化模铸造的ＥＰＣＡＤ软件。该软件通过与典型件工艺库的接口，充分利用已有经验进行设计，其结果具有较高的实用价值     

气化模—精铸—负压复合铸造工艺的研究

研究了气化模的选材及成型工艺、制壳材料及制壳工艺、失模工艺,型壳焙烧工艺,型砂震动紧实工艺和负压浇注工艺等.采用该项复合工艺可铸造各种合金的大型、复杂的少无余量精铸件.     

热锻模耐热层堆焊材料的实验研究

为适应热锻模耐热层材料使用性能的要求，研制了一种新型的热作模真钢堆焊焊条。对比分析了所研制焊条堆焊材料的硬度，显微组织及回火稳定性。从堆焊材料成分的角度，解释了所研制焊条堆焊材料所具备的特性。     

铝合金干砂消失模铸造传质研究现状与展望

回顾了铝合金干砂消失模铸造传质研究的进程,重点总结了模样热分解特性及热解产物在涂层和干砂中传输等方面的研究成果。指出了以往研究中的不足及今后的研究方向。     

The lost-foam casting of aluminum alloy components

In the lost-foam casting process, liquid metal is poured directly onto a refractory-coated, foamed polymer pattern which is buried in loose sand. The polymer pattern undergoes thermal degradation and is gradually replaced by the molten metal, which solidifies and produces the casting. The inherent operating advantages of this innovative technique have generated considerable interest among casting manufacturers. Currently, the process is being utilized to manufacture a wide variety of ferrous and nonferrous components catering primarily to the automotive industry. Because the process is relatively new, there is a compelling need to quantify the influence of process parameters on microstructure and mechanical properties. Furthermore, the interaction of the thermal degradation products with the solidifying metal may produce several unique defects in the casting.     

镁合金反重力消失模铸造临界阻流面积的研究

通过4组试验研究了不同阻流面积情况下镁合金充型速度的变化规律，探讨可控气压下镁合金消失模铸造临界阻流面积大小及其与模样尺寸的关系。试验结果表明，可控气压下镁合金消失模铸造存在一个临界阻流面积，且液态镁合金在压缩气体和真空度的双重作用下，充型速度较快，临界阻流面积大于重力消失模铸造临界阻流面积，且随着铸件模数的增大而增大。     

粘结剂组成对粘结剂和喂料热性能的影响

研究制备了PW，BO，OP3大系列10种组成的粘结剂及相应10种W-Ni-Fe粉末与粘结剂的混合料。并采用热失重-差热分析(TGA-DTA)分析了粘结剂和喂料的热性能。研究结果表明，粘结剂组成对粘结剂和喂料的热性能如熔点、热分解温度和热分解曲线有很大的影响。通过此变化可以更为准确地确定不同粘结剂组成的喂料中的粘结剂脱除工艺和脱除方式。     

The Effect of Surface Chemistry and Morphology on the Properties of HVAF PEEK Single Splats

Thermal spray of polymers has had limited investigation due to the narrow processing windows that are inherent to polymer powders, especially their low temperatures of thermal degradation. The polymer poly aryl ether ether ketone (PEEK) has a continuous use temperature of 260 °C, does not suffer significant thermal degradation below 500 °C (Lu et al., Polymer, 37(14):2999-3009, 1996), and has high resistance to alkaline and acidic attack. These properties led to PEEK being selected for investigation. To minimize thermal degradation of the particles, the high velocity air fuel technique was used. To investigate the effect of substrate pretreatment on single splat properties, single splats were collected on aluminum 5052 substrates with six different pretreatments. The single splats collected were imaged by scanning electron microscopy and image analysis was performed with ImageJ, an open source scientific graphics package. On substrates held at 323 °C, it was found that substrate pretreatment had a significant effect on the circularity and area of single splats, and also on the number of splats deposited on the substrates. Increases in splat circularity, area, and the number of splats deposited on the surface were linked to the decrease in chemisorbed water on the substrate surface and the decrease of surface roughness. This proved that surface chemistry and roughness are crucial to forming single splats with good properties, which will lead to coatings of good properties.     

火焰喷涂EAA/n-SiO2复合涂层热力学性能

采用火焰喷涂的方法制备了EAA(乙烯-丙烯酸共聚物)及其纳米SiO2(n-SiO2)复合涂层,利用电子拉力机、傅立叶红外光谱仪(FTIR),差示扫描量热仪(DSC)、热重分析仪(TG)对涂层的力学性能、热性能等进行了测试分析.结果表明:在适当的喷涂工艺条件下,物料在火焰喷涂过程中没有发生氧化或降解;DSC、TG分析表明n-SiO2具有明显的成核剂作用,n-SiO2的加入提高了复合涂层的结晶度,加速复合涂层的结晶速度;在n-SiO2含量为2.0%时,复合涂层表现出较好的综合性能,涂层与基体的结合强度达到26.30MPa,涂层自拉伸强度为33.87MPa,较纯涂层提高了30.6%.     

消失模涂料对EPS裂解产物传输特性的影响

针对消失模铸造过程中EPS模样裂解产物，涂料性能对铸件质量的影响，介绍了一种消失模涂料对EPS裂解产物传输特性的测试仪器吸测试方法。讨论了消失模涂料厚度、涂层高温透气率、涂料组分对EPS裂解产物传输特性的影响。     

镁合金消失模铸造模样的热解特征

采用气相色谱分析的方法对三种泡沫模样:聚苯乙烯(EPS)、共聚物(StMMA)、聚甲基丙烯酸甲酯(EPM-MA)的热解特性进行了分析,同时对镁合金消失模实际浇注的热解气体进行了测试,得出了镁合金消失模不周泡沫模样热解产物的种类和分布.研究指出,StMMA的品质及其热解特性表明它更适合于镁合金消失模铸造,有利于高性能复杂薄壁镁合金消失模铸件的成形.     

Thermal studies on polyindole and polycarbazole

The time and temperature dependences of conductivity of electrochemically prepared polyindole and polycarbazole perchlorates are analysed to understand the aging process and mechanism of conduction. Arrhenius and Mott plots suggest a variable range hopping (VRH) mechanism for polyindole and nearest-neighbour hopping for polycarbazole. The degradation behaviour has been studied by thermogravimetry (TG) and differential thermal analysis (DTA) techniques. The thermal reactions involve loss of dopant, followed by degradation of the polymer backbone. The decomposition temperatures of polyindole and polycarbazole are higher than the values reported in the literature for polyaniline, polypyrrole and polythiophene. The energy of activation for the polymer degradation process has been calculated using three methods and the results are compared.