Powder Metallurgical Processing and Development of Functional Composites

1. 单分散颗粒的制备：设计了单分散颗粒的脉动孔喷射装置，阐明了球形合金颗粒的形成细节。2. 粒子组装的功能控制：研究了构型结构与功能表现之间的关系，重点研究了渗透和功能梯度结构。通过排列多达1000个粒子，证实了其导电性和热电性。3. 颗粒组装实验：测试了吸笔吸起、流到配置模板上、线性排列到垂直管上等几种组装方法对球形颗粒的有效组装，并建立了每种方法的操作规范。4. 浆液点胶组合形成复合结构：设计了一种将颗粒浆液和排列在板上形成预先设计好的复合结构构型的方法。这种方法被证实对于复合材料结构的形成有几个优点，它使我们可以直接从一个三维的复合结构，也给我们提供了各种材料选择和组合的可能性。5. 排列粒子的键合与组合功能：确定了粒子间键合的四种类型，并阐明了它们的形成机制。测量了Bi-Sb合金线性粒子组合的塞贝克系数，得到了与单晶相当的塞贝克系数。6. 压电陶瓷的功能分级：评估了具有功能分级结构的单晶片和双晶片致动器的弯曲特性，并证实它们具有足够的弯曲位移和键合完整性。7. Al_2O_3-YAG陶瓷的复合结构：采用火花等离子烧结法制备了Al_2O_3-YAG共晶合金型陶瓷。形成了等长组织，产品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