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动孔板喷射装置，阐明了球形合金颗粒的形成细节。2.颗粒组装的功能控制：研究了颗粒的构型结构与功能表现之间的关系，重点研究了渗流结构和功能梯度结构。电导率和热电性能被证实通过排列多达1000个颗粒来体现。3.颗粒组装实验：对球形颗粒的有效组装进行了吸笔拿起、流经构型模板和垂直管内直线排列等几种组装方法的试验，并制定了每种方法的操作规范。4.浆料分配组件形成复合结构：一种在…中分配颗粒浆料和阵列的方法将更多的g放到板上，形成预先设计的复合材料结构构型。这种方法被证实对于复合材料结构的形成有几个优点，因为它使我们能够直接形成三维复合材料结构，也为我们提供了各种材料选择和组合的可能性。5.排列颗粒的结合及集合体的作用：确定了颗粒间结合的四种类型，并阐明了它们的形成机理。测量了BiSb合金的线状颗粒组合的Seebeck系数，得到了与单晶相当的数值。6.压电陶瓷的功能分级：对具有功能梯度结构的单晶片和双晶片驱动器的弯曲特性进行了评估，证实了它们具有足够的弯曲位移和结合的完整性。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一种共晶合金型Al_2O_3-YAG陶瓷。形成了等轴晶组织，且具有良好的高温强度。较少

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