Joining composite materials with reactive nickel-aluminium particles as an innovative additive in epoxy-based adhesives

21st Chemnitz Seminar on Materials Engineering – 21. Werkstofftechnisches Kolloquium

Grohmann, S.^1 ; Friedrich, M.^1 ; Zaeh, M.F.^1

Institute for Machine Tools and Industrial Management (Iwb), Technical University of Munich, Boltzmannstrasse 15, Garching

85748, Germany^1

关键词: Aluminium particles;    Innovative approaches;    Joining technology;    Lightweight components;    Microwave energies;    Self-sustaining reactions;    Stoichiometric ratio;    Thermo-physical property;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/480/1/012011/pdf
DOI  :  10.1088/1757-899X/480/1/012011

来源: IOP

【 摘 要 】

Joints comprised of materials with different thermo-physical properties are often advantageous for lightweight components. However, the fabrication of such joints has become a key issue for joining technologies. An innovative approach to overcome the associated challenges is the use of reactive particles. Each reactive particle contains at least two reactants, which are able to undergo an exothermic, self-sustaining reaction after the ignition by an external energy input. Depending on the stoichiometric ratio of the reactants and the heating rate, temperatures up to 1500 K are reached within milliseconds for the nickel and aluminium system. In the automotive industry, bonding is state of the art for applications in electromobility. Yet, slow cross-linking of the adhesive increases cycle times and results in an initial low handling strength, which requires additional mechanical fixings. The benefits of using reactive particles in epoxy-based adhesives are shown in this paper. Varying quantities of reactive particles were integrated into two part epoxy adhesives and activated with microwave energy. Due to the promotion of the cross-linking of the epoxy resin and the reaction of the particles by the microwaves, curing times were significantly shortened. Joining aluminium and polypropylene specimens demonstrated the potential of the presented approach.