Powder Metallurgical Processing and Development of Functional Composites

1.单分散颗粒的制备：设计了用于制备单分散颗粒的脉冲喷孔喷射装置，并阐明了球形合金颗粒的形成细节。2.粒子组装的功能控制：研究了形态结构与功能表现之间的关系，特别强调了渗流和功能梯度结构。通过排列多达1000个颗粒，证实了导电性以及热电性能。3.颗粒组装实验：采用吸笔拾取法、流动模板法和直线排列法对球形颗粒进行了有效的组装，并建立了各种组装方法的操作规范。4.一种颗粒浆料的分散和排列方法 ...更多信息 g到板上以形成预先设计的复合结构配置。该方法被证实具有形成复合结构的几个优点，因为它使我们能够直接形成三维复合结构，并且还为我们提供了各种材料选择和组合的可能性。5.排列颗粒间的键合及聚集体的作用：颗粒间的键合主要有四种，并阐明了它们的形成机理。测量了Bi-Sb合金线性颗粒集合体的塞贝克系数，得到了与单晶体相当的值。6.压电陶瓷的功能分级：对具有功能分级结构的单压电晶片和双压电晶片致动器的弯曲特性进行了评估，我们证实它们具有足够的弯曲位移和结合完整性。7. Al_2O_3-YAG陶瓷的复合结构：采用放电等离子烧结法制备了共晶合金型Al_2O_3-YAG陶瓷。结果表明，该复合材料形成了等轴组织，具有良好的高温强度。少

1. Preparation of monodisperse particles : The pulsated-orifice-ejection apparatus for the production of monodisperse particles was devised, and the formation details of the spherical alloy particles were clarified. 2. Function control of particle assembly : The relation between the configuration structure and the function manifestation were studied with particular emphasis on percolation and functionally graded structures. The electrical conductivity, as well as thermoelectric property, was confirmed to manifest by arraying as many as 1000 particles. 3. Particle assembling experiment : Several assembling methods such as picking up with a suction pen, flowing onto a configuration template and linear arraying into a vertical tube, were tested for an effective assemblage of spherical particles, and the manipulating specifications for each of the methods were established. 4. Composite structure formation by the slurry dispensing assemblage : A method dispensing particle slurry and arrayin … More g onto a plate to form a pre-designed composite structure configuration was devised. This method was confirmed to have several advantages for the formation of composite structures, in that it enables us to directly from a three dimensional composite structure and also give us possibilities of various materials selection and combination. 5. Bonding of the arrayed particles and function of the assemblage : Four kinds of bonding were identified for the interparticle bonding, and their formation mechanisms were clarified. The Seebeck coefficient of a linear particle assemblage of Bi-Sb alloy was measured, and a value comparable to that for single crystal was obtained. 6. Functional grading of piezoelectric ceramics : The bending characteristics of unimorph and bimorph actuators with functionally graded structures were evaluated, and we confirmed that they have sufficient bending displacement with a bonding integrity. 7. Composite structure of Al_2O_3-YAG ceramics : A eutectic alloy type of Al_2O_3-YAG ceramics was prepared by spark-plasma sintering. An isometric microstructure was found to be formed, and the products showed good high temperature strength. Less