Polymer bonded textured composites with single crystalline NiMn-based MSM particles for magnetic-field controlled dampers and actuators

用于磁场控制阻尼器和执行器的具有单晶 NiMn 基 MSM 颗粒的聚合物粘合织构复合材料

• 批准号: 28238542
• 负责人: Professor Dr. Oliver Gutfleisch
• 金额: --
• 依托单位: Fachgebiet Funktionale Materialien
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/28238542?language=en
• 关键词: Polymer; bonded; textured; composites; single

Magnetic shape memory (MSM) alloys are a new class of magnetically driven active materials that show large strains of up to 10% in single-crystal Ni2MnGa of 7M modulated martensitic structure. The magnetic field induced movement of twin boundaries can be exploited for actuators, sensors and, as it is an energy dissipating process, also for vibration damping devices. However, single-crystals of Ni2MnGa are difficult to prepare and cannot easily support significant tensile stresses as they are inherently very brittle. One solution is the use of aligned MSM particles suspended in a stiffness-matched polymer matrix. In this project, MSM particles will be produced from melt-extracted Ni2MnGa fibres. This, in the field, unique method simplifies the preparation of single-crystal martensitic particles by an appropriate heat treatment. Composites will then be produced by embedding the particles in a polymer matrix. Materials processing, characterisation and modelling will be used to optimise magnetic and magnetoplastic properties, which depend on particle alignment, size and shape of the particles as well as packing density but also on thermal and mechanical properties of the polymer. One further advantage of the here to be developed composites could be that the typical threshold behaviour of single-crystal Ni2MnGa could be moderated by tailoring their magnetic, thermal and magneto-mechanical properties.

磁性形状记忆（MSM）合金是一类新型的磁驱动活性材料，具有7M调制马氏体结构的单晶Ni2MnGa合金表现出高达10%的大应变。磁场引起的孪晶边界的运动可以用于致动器、传感器，并且由于它是能量耗散过程，所以也可以用于振动阻尼装置。然而，Ni2MnGa的单晶难以制备并且不能容易地支撑显著的拉伸应力，因为它们固有地非常脆。一种解决方案是使用悬浮在刚度匹配的聚合物基质中的对齐的MSM颗粒。在该项目中，MSM颗粒将由熔融提取的Ni2MnGa纤维生产。在该领域中，这种独特的方法通过适当的热处理简化了单晶马氏体颗粒的制备。然后将颗粒嵌入聚合物基质中生产复合材料。材料加工、表征和建模将用于优化磁性和磁塑性性能，这些性能取决于颗粒的排列、尺寸和形状以及堆积密度，还取决于聚合物的热性能和机械性能。这里要开发的复合材料的另一个优点可以是单晶Ni2MnGa的典型阈值行为可以通过定制它们的磁、热和磁机械性能来缓和。