Preparation of Fuctinally Graded Materials in high Energy Field of Plasma

等离子体高能场功能梯度材料的制备

基本信息

批准号：
06555191
负责人：
HIRAI Toshio
金额：
$ 10.94万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555191/
关键词：
Spark plasma sintering Residual stress Functionally graded materials Ceramics Imide polymer Stainless steel Copper Nickel 異種材料焼結温度差焼結高圧放電プラズマ焼結機 ZrO_2 Ni傾斜機能材料ステンレス鋼傾斜機能ポリイミド Al傾斜機能材料

项目摘要

Functionally graded materials (FGM) are new concept of materials, and formed by the combination of metalceramics, metal-polymer and ceramics-polymer. General methods of the preperation of FGM has not been established, bacause the sintering temperature of ceramic, metal and polymer powders is different. A spark plasma sintering equipment (SPS) is a sort of a hot-press. Powders are put in a graphite die, and set in the SPS equipment. The graphite die is heated by direct pulse current. The pulse current generates plasma around powders in the graphite die. New die, New die, of which diameter is different between an upper part and a lower part, has been made. This die leads to graded temperatures and makes it possible to prepare various kinds of FGM.1.Polyimide/metal (Al and Cu) FGM : The polyimide is a excellent heat-resisting polymer. This polymer is used for an IC package and base. The combination of the polymer and metals (Al and Cu) offers the material of which one side is an insulator … More and other side is conductive. The dense polyimide/Al or Cu FGM can be obtained by spark plasma sintering. Residual stress is relaxd by the three graded layrs of the different ratio of polyimide and the metal.2.ZrO_2(3Y)/metals (Ni and stainless steel) FGM : Ceramic materials are brittle, heat-resisting and oxidation-resisting. Matals are ductile, but they melt and are oxidized at high temperatures. The combination of the ceramics and metals give a good heat-resisting material that can be used in air at high temperature. The dense ZrO_2 (3Y)/metals (Ni and stainless steel) were prepared using the spark plasma sintering equipment. The residual stress is relaxd by ten graded layrs of the different ratio of ZrO_2 (3Y) and the metal.3.Residual stress in FGM : The residual stress comes from the mismatch of the thermal expansion of the polymer, metal and the ceramics. The concept of FGM is the fact that the graded layrs of the different ratio of powders can relax the residual stress. The reasidual strss of the polyimide/metal FGM is relaxd by the plastic deformation of polymers and metals. The combination of ceramics and metals can not afford enough relaxation. That is why the ten layrs are needed between the ceramic and metal layrs.4. High voltage spark plasma sintering apparatus : Plasma is generated around powders in the graphite die. The energy of the spark plasma sintering equipment is low and not enough to create high performing FGM.The apparatus that could be used under the condition of high voltage was made to increase the energy of the plasma. This is effective for the FGM formation. Less

功能梯度材料(FGM)是由金属陶瓷、金属-聚合物和陶瓷-聚合物结合而成的新概念材料，由于陶瓷、金属和聚合物的烧结温度，目前尚未建立FGM的通用制备方法。粉末则不同。火花等离子烧结设备（SPS）是一种热压机，将粉末放入石墨模具中。通过直接脉冲电流加热，脉冲电流在石墨模具中的粉末周围产生等离子体，制成了上部和下部直径不同的新模具。使得制备各种FGM成为可能。 1.聚酰亚胺/金属（Al和Cu）FGM：聚酰亚胺是一种优异的耐热聚合物，该聚合物用于IC封装和基底。（阿尔和Cu)提供一侧为绝缘体，另一侧为导电体的材料，可通过放电等离子烧结获得致密的聚酰亚胺/Al或Cu FGM，通过不同比例的三个梯度层来松弛残余应力。聚酰亚胺和金属。2.ZrO_2(3Y)/金属（镍和不锈钢）FGM：陶瓷材料脆性大，耐热性好金属具有延展性，但在高温下会熔化并氧化，是一种良好的耐热材料，可在高温下使用。采用放电等离子烧结设备制备了不同比例的ZrO_2(3Y)和ZrO_2(3Y)的十个梯度层来松弛残余应力。 3.FGM中的残余应力：残余应力来自聚合物、金属和陶瓷的热膨胀不匹配。FGM的概念是不同比例的粉末的分级层可以松弛残余应力。聚酰亚胺/金属FGM的残余应力通过聚合物和金属的塑性变形来松弛，这就是十层的原因。 4. 高压放电等离子烧结设备：在石墨模具中的粉末周围产生等离子体，放电等离子烧结设备的能量较低，不足以产生高性能的 FGM。在高电压条件下使用，以增加等离子体的能量，这对于FGM的形成是有效的。