Investigation of the Bonding and Working Processes in Metal-Ceramics using the New Fabricating Method

大多数新型先进材料都缺乏可加工性，因此有必要建立一种成形方法，如超导导线或形状记忆合金片等。本文研究了硬质合金、精细陶瓷和金属间化合物等低加工性材料的制备方法。讨论了多金属坯料或包层的接合界面性能和可加工性。采用真空离子束沉积技术在钢板上制备薄涂层作为内层。沉积Ti、Ag和Nb，考察其结合、挤压和拉丝特性。通过芯套之间的摩擦和剪切结合，研究了金属-金属或陶瓷包层之间的相容性。作为硬核的材料是钢、铌和一些金属粉末和陶瓷。铜和软磁铁用作软套。采用光学显微镜、扫描电镜和剖面仪对复合材料的界面进行了详细的研究。多金属坯料经冷挤压、轧制、拉制成复合线材制品。目前的研究结果可以总结如下：1。在轧制板之间的一些金属涂层改善了粘合质量。多材料坯料的几何形状，即挤出套和芯，可以设计，使界面可能变得相关，以提供在严重的摩擦和剪切应力下的结合强度。因此，成功地进行了多材料坯料的冷挤压和拉丝，面积收缩率达到-10^5。

Most of new advanced materials are lacking workability, so it is necessary to build up a method of forming into desired shapes, e.g. superconducting wires or shape memory alloy sheets etc.. This study relates to the methods of manufacturing of the materials with low workability, such as hard alloys, fine ceramics and intermetallic compounds. Properties of the joint interface and workability of the multi-metal billet or clad are discussed.The thin coating as an inner layr was made on the steel sheets using a vacuum ion beam deposition. Ti, Ag and Nb were deposited to examine the bonding, extrusion and wire drawing characteristics. The conpatibilities in metal-metal or -ceramic clads are investigated through the friction and shear bonding between core/sleeve by varying the diameter differences of them. Materials as the hard core are steels, Nb and some metal powder and ceramics. Copper and soft magnetic iron are used as softer sleeves.The interface of clad composites are investigated by optical and scanning electron microscopies and a profile meter in detail. The multi-metal billets are cold extruded, rolled and drawn to the composite wire products.The present results may be summarized as follows :1. Some of the metal coating between rolling sheets improved bonding qualities.2. The geometries of the multi-material billets, namely extrusion sleeve and core, can be designed so that the interface may become relevant to provide the bond strength with severe friction and shear stress.3. Consequently, the cold extrusion and wire drawing of the multi-material billet was sucsessfully performed up to areal reduction ratio of -10^5.