结构胶粘带的应用性能研究

采用无基材或以玻璃纤维布为基材,制备了具有良好压敏性的结构胶粘带。对其应用性能的研究结果表明,该结构胶粘带在固化前有较高的剥离强度和良好的贮存稳定性,而固化后可获得>20MPa的常温剪切强度,且耐热和耐水性能较好。文章还研究了结构胶粘带的固化工艺。     

流延法制备陶瓷薄片的研究进展

流延成型是一种目前使用较广泛,能够获得高质量、超薄型陶瓷薄片的成型方法.本文论述了流延成型时有机物(包括溶剂、分散剂、粘结剂、增塑剂等)的选择原则、浆料的制备以及流延工艺过程,并对影响流延膜厚度和流延膜质量的因素进行了分析讨论,同时提出了改进流延膜质量的措施.     

多层水系流延和共烧法制备具有阳极功能层固体氧化物燃料电池

采用多层水系流延和共烧方法制备具有阳极功能层的单电池。阳极基底、阳极功能层、电解质层和阴极层分别为Ni-YSZ、Ni-ScSZ、YSZ和LSM-ScSZ。在H2/空气气氛中,分别在700、750、800℃测试具有阳极功能层的单电池,其最大功率密度分别为：0.30、0.55W/cm2和0.8W/cm2;其对应的电池欧姆电阻（R0）分别为0.39、0.30cm2和0.19cm2。电池的极化电阻则分别为1.28、0.91cm2和0.62cm2。采用相同工艺制备无阳极功能层的单电池,其在700、750、800℃的最大功率密度分别为0.21、0.31W/cm2和0.56W/cm2,对应的R0为0.41、0.39cm2和0.28cm2。电池的极化电阻为1.40、1.27cm2和0.91cm2。这说明采用的多层水系流延和共烧法制备的固体氧化物燃料电池的阳极功能层能有效减小电池的活化极化,从而提高单电池的电化学性能。     

管间高粘度流体的有效传热温差缓变特性

通过数值模拟,研究了85%甘油在旋流片支撑光滑管管束间纵向流动的传热与流阻特性,并与无支撑光滑管束的纵向流动进行了对比,揭示了高粘度流体置换类强化传热方法的有效传热温差缓变特性机理。研究结果表明,层流时,小扭率与大角度旋流片支撑的光滑管管束的传热综合性能更佳,旋流片支撑光滑管管束在有旋流片段可以通过提高有效传热系数与增加有效传热温差的双重途径提高传热速率,而在旋流片下游段则可以利用有效传热温差的缓变特性继续维持较大的传热速率,从而能避免过多的流体置换次数,极大幅度的降低了流体的输送功耗。     

Polyurethane paint adhesion improvement on aluminium alloy treated by plasma jet and dielectric barrier discharge

The effect of atmospheric pressure plasma treatment on the adhesion between a protective coating and AA1100 alloy was investigated. Two plasma sources were used for surface modifications: atmospheric pressure plasma jet and dielectric barrier discharge. The surface roughness and water contact angle measurements were conducted in order to evaluate the changes on the aluminium surface after plasma processing. The paint coating was tested using the adhesion tape test (ASTM D3359). A significant improvement of surface wettability and adhesion was obtained after plasma treatments.     

Multifunctional antiferroelectric MLCC with high‐energy‐storage properties and large field‐induced strain

Multifunctional antiferroelectric (Pb_0.92?xBa_0.05La_0.02Dy_x)(Zr_0.68Sn_0.27Ti_0.05)O₃ multilayer ceramic capacitor (MLCC) was prepared successfully by the tape‐casting method. The MLCC with 10‐thick layers exhibits compact structure, excellent energy‐storage, and strain properties. For energy‐storage performance, the pulsed discharge current reveals that the stored energy can be released in a quite short time of about 600 ns. The maximum discharge energy density was obtained in the sample with x = 0.04 at 300 kV/cm, which was 3.8 J/cm³ calculated by the hysteresis loop and 2.7 J/cm³ by the pulsed discharge current, respectively. Meanwhile, the MLCC possesses large strain property, where the sample with x = 0.04 shows a high field‐induced strain of 0.71% at room temperature. In addition, the temperature dependence of energy‐storage and strain demonstrates that the MLCC has good temperature stability. The results indicate that the multifunctional MLCC can be a promising candidate for the application in energy and sensor fields.     

Estimation of uncertainty with the modulus of elasticity measured by means of tensile test for BSCCO tapes

The international round robin test (RRT) was conducted in order to establish the international standard for the tensile test method for BSCCO-2223 tape shaped wires. The measurands of mechanical properties were statistically analyzed to estimate their standard uncertainties and their correlation among laboratories. Consequently the large variance was observed with the modulus of elasticity determined from the initial loading curve. The reason has been examined by estimating type B uncertainties causing at every step of the experimental procedure. With respect to the modulus of elasticity, the grand intra-lab average of relative standard uncertainty (RSU) obtained from the RRT coincided roughly with that derived by means of type B evaluation. Thus it is emphasized that the type B evaluation is very effective tool for expecting the uncertainties of the observations like the modulus of elasticity. On the other hand, the grand over-all RSU was larger than the grand intra-lab one. The combined standard uncertainties were calculated by changing the strain rate, but kept other parameters constant. In order to suppress the influence from the strain rate to the variance, it has been recommended that the strain rate shall be regulated less than 2 × 10⁻⁴ 1/s in the tensile test method.     

CaAlSi系LTCC生带的流延制备及其烧结基板

以自制的CAS(CaO-Al2O3-SiO2)系玻璃作为功能相,通过分析不同的有机组分对流延浆料流变性能及分散稳定性的影响,优选:甲基乙基酮-乙醇为二元共沸溶剂;磷酸三丁酯为分散剂。浆料的黏度随粘结剂加入量增大而增大。随着增塑剂含量的增加,浆料黏度先减小后增大,当ζ(增塑剂:粘结剂)=0.6时,浆料黏度最低。流延浆料的最佳配方为:玻璃粉100.0g,粘结剂18.0g,磷酸三丁酯3.0g,增塑剂10.8g,溶剂为150.0～170.0g。流延生带样品于950℃烧结后获得相对密度达到96%,相对介电常数为6.97,介电损耗低于0.3%(1MHz)的玻璃陶瓷基板材料。     

从皮尺铅垂到三维扫描——浅谈古建筑测绘方式的更新

古建筑测绘不仅仅关系到作为文化载体的古建筑信息采集的有效性,还关系到古建筑文物的保护工作。从这个角度来讲,必须高度重视古建筑测绘技术。文章首先探析了古建筑测绘方式更新的必要性,总结和归纳了皮尺铅垂和三维扫描的优劣对比,在此基础上提出在古建筑测绘方式革新的过程中,应该充分利用现代科学的进步,以三维扫描为主以传统测量方式为辅,实现两者之间的优化组合,以便更加高效,更加合理的开展古建筑测绘工作,使得测绘质量和水平不断提高。     

开设交叉学科流延成型实验 提高大学物理实验教学质量

流延成型是一种能够获得高质量陶瓷基片的方法,在微电子领域和材料领域得到广泛应用。通过改进实验装置,合理安排实验内容,将流延成型实验引入大学物理实验教学中,激发学生对物理实验的积极性。在实验中注重锻炼学生创新思维,从而培养学生的创新能力和创新精神。