WETTABILITY OF MICRON・SUBMICRON METAL POWDERS ON CERAMICS AND IT'S TECHNICAL APPLICATION

利用自制的金属粉末润湿性测试装置，研究了细粒金属粉末（约10 ~ 700 μ m）在陶瓷上的润湿性，并应用插入金属粉末作为陶瓷与金属的连接剂。对真空系统的润湿性测量仪进行了改进。1988年和1989年设置光学显微镜和温度控制系统。通过这些改进，可以研究高真空下的稳定性测量，获得高分辨率的接触角，提高实验温度的精度。实验结果总结如下：1)对Si_3N_4- al、Si_3N_4- cu、SiC-Al、ZrO_2-Al、ZrO_2-Cu、Al_2O_3-Al、Al_2O_3-Cu和Si_3N_4-（Al-Si合金）等润湿体系润湿性的温度和时间依赖性以及陶瓷与金属接触界面的微观结构观察进行了研究。研究了Si_3N_4-Al和ZrO_2-Al体系润湿性的粒径依赖性。除Si_3N_4-Cu、ZrO_2-Cu和Al_2O_3-Cu体系外，其他润湿体系均存在温度和时间依赖性。在Al_2O_3-Al和Al_2O_3-Cu体系中，反应层在接触界面处形成。结果表明，随着粉末金属粒度的减小，润湿性得到改善。2)从Si_3N_4- al和Si_3N_4-（Al-Si合金）体系的润湿行为来看，接触界面组分的反应和扩散不是润湿性的主要原因。3)本工作的技术应用。建议如下。(1)建议使用细颗粒金属粉末作为插入金属。(2)为Si_3N_4-AI复合材料的产物。纯铝和铝硅合金表现出相同的润湿行为。4)在亚微米级上，随着粒径的减小，润湿性有所提高。定量实验结果尚未得到。少

Using self-made apparatus for the measurement of wettability and the metal powder, the wettability of fine size metal powder (about 10-700 mum) on ceramics has been investigated and discussed with the application of insert metal powder for the joining between ceramics and metal.Improvements of the wettability measurement apparatus have been made on vacuum system. setting of optical microscope and control system of temperature in 1988 and 1989. By these improvement, it has been capable to study the metability measurement at high vacuum, to obtain the high resolution of the contact angle and to improve the accuracy of the experimental temperature.The experimental results are summarized as follows;1) For all the wetting systems(Si_3N_4-Al,Si_3N_4-Cu,SiC-Al,ZrO_2-Al,ZrO_2-Cu,Al_2O_3-Al,Al_2O_3-Cu and Si_3N_4-(Al-Si alloys), the temperature and time dependence of wettability and the observation of microstructure of a contact inerface between ceramics and metal have been studied. The particl … More e size dependence of the wettability has been investigated in the Si_3N_4-Al and ZrO_2-Al systems. The temperature and time dependence of the metability have been recognized in the wetting systems except the Si_3N_4-Cu, ZrO_2-Cu and Al_2O_3-Cu systems. The reaction layer has been formed at the contact interface in Al_2O_3-Al and Al_2O_3-Cu systems. It has been found out that the wettability is improved with decreasing the particle size of powder metal.2) From the wetting behavior in the Si_3N_4-Al and Si_3N_4-(Al-Si alloy) systems, it is found that the reaction and the diffusion of components at the contact interface are not responsible for the wettability.3) For technical application of the present work. it has been suggested as follows. (1) The use of fine particle metal powder is recommended as a insert metal. (2) For the product of a Si_3N_4-AI composite materials. pure Al and Al-Si alloy show the same behavior of the wetting.4) On the submicron size, it is found that the wettability is improved with decreasing particle size, however. the quantitative experimental results have not been obtained yet. Less