Functional Materials Processing by Electromagnetic Heating

1)采用感应耦合射频等离子烧结方法对硬质合金陶瓷TaC和HFC进行了烧结，获得了用于高温反应气体中的新型弧电极。2)对氮化硅和氧化锆进行了毫米波(28 GHz)烧结，并与传统热法烧结性能进行了比较。在两种材料中都观察到了样品的加速致密化，这导致了致密化而没有明显的颗粒生长。3)研究了在毫米波辐射的强场中加热的陶瓷的红外光谱测量，以开发一种可靠的方法来测量样品的温度以及测量介电性能。4)用离子束辅助沉积(Ti，用电子衍射仪研究了离子辐照对相形成和显微组织的影响。5)用有限元方法研究了裂纹的形成机制。6)举办了大阪大学和卧龙岗大学的两次联合研讨会，介绍并讨论了合作研究的结果；1996年3月在卧龙岗大学举行的“材料的微波和等离子体加工联合研讨会”和1997年2月在大阪大学举行的“先进材料的微波、等离子体和热化学加工国际研讨会”。

A series of this investigation has been performed as "University-to-University Cooperative Research" between Joining and Welding Research Institute, Osaka University (Japan) and Department of Materials Engineering, University of Wollongong (Australia) for studies on "Functional Materials Processing by Electromagnetic Heating".1) Sintering of carbide ceramics TaC and HfC has been performed by inductively coupled rf plasma sintering method to obtain novel are electrodes for use in reactive gas at high temperature.2) Millimeter-wave (28GHz) sinteting of silicon nitride and zirconia has been carried out to compare the sintering performance with that obtained by conventional thermal process. In both materials, accelerated densification of the samples has been observed, which resulted in the densification without appreciable grain growth.3)Infrared spectroscopic measurements of the ceramics heated in the strong field of millimeter-wave radiation has been studied to develop a reliable method to measure the sample temperature as well as to measure dielectric properties.4) Ion-solid interaction has been studied by ion beam assisted deposition of (Ti, Al) N.The effect of ion irradiation on the phase formation and the microstructure has been investigated using electron diffraction.5) A finite-element-method has been developed to investigate the crack formation mechanism.6) Two joint symposia between Osaka University and University of Wollongong were held to present and discuss the results of the cooperative research ; "Joint Symposium on Microwave and Plasma Processing of Materials" held in the University of wollongong in March 1996 and "International Symposium on Microwave, Plasma and Thermochemical Processing of Advanced Materials" held in Osaka University ih February 1997.