Simulation of the microstructure evolution in the brazing gap during reactive air brazing II

反应空气钎焊过程中钎焊间隙微观结构演变的模拟 II

基本信息

  • 批准号:
    164190245
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    德国
  • 项目类别:
    Research Grants
  • 财政年份:
    2010
  • 资助国家:
    德国
  • 起止时间:
    2009-12-31 至 2014-12-31
  • 项目状态:
    已结题

项目摘要

For the fabrication of metal-ceramic components, "Reactive Air Brazing" (RAB) has emerged as a joining process with high potential. The mechanical properties of a reactive air brazed joint are often limited by structural changes and the formation of oxide phases at the interface between the base material and the brazing alloy. Experimental investigations of brazing joints with Ag-Cu braze alloys show that in BSCF ceramic a reaction zone may form, which is associated with the penetration of Cu-and Co-containing melt along grain boundaries. At the interface to Cr-containing steels Cu and Cr-containing oxides are found. Morphology and thickness of such reaction zones affect the failure under mechanical load.The aim of this project is to model the formation of such reaction zones and to simulate the kinetics of the microstructure evolution for reactive air brazing with Ag-Cu braze alloys quantitatively. The simulation should help to identify those processes that control the formation kinetics, e. g. diffusive transport of oxygen or cupper, or the mobility of phase boundaries. A semi-quantitative understanding of the microstructure formation may lead to new ideas how the thickness of the undesired reaction zones can be influenced by a change in the alloy composition or the process conditions, e.g. by applying different oxygen partial pressures.In the model development results from the first phase of the project can be used. So far, the effect of the oxygen intake on phase formation and solidification kinetics of Ag-Cu braze alloys could be simulated quantitatively. The phase-field model has been extended to calculate DSC traces. This allows a quantitative comparison between the simulated microstructure evolution and measured DSC scans. Furthermore, computer-aided thermodynamics and the phase-field method will be used.In particular, the following points will be addressed: Simulation of the melting process and accompanied phase formation for the braze alloy, the interaction between the liquid braze alloy and BSCF ceramic, as well as reaction and phase formation at the interface between the molten Ag-Cu alloy and Cr-containing steel. A comprehensive thermodynamic database is not available for the materials involved. Based on available literature data and appropriate approximations a simplified thermodynamic description shall be developed and calibrated using the experimental results of the project partners. Thus, this project also provides a methodological contribution towards a thermodynamic approach for the modeling of joining processes for dissimilar materials.
对于金属陶瓷构件的制造,“反应空气钎焊”(RAB)已成为一种具有很高潜力的连接工艺。反应性空气钎焊接头的机械性能通常受到结构变化以及在基材和钎焊合金之间的界面处形成氧化物相的限制。对Ag-Cu钎料钎焊接头的实验研究表明,在BSCF陶瓷中可能形成一个反应区,这与含Cu和Co的熔体沿沿着的渗透有关。在含Cr钢的界面处发现了Cu和Cr的氧化物,这些反应区的形貌和厚度影响着机械载荷下的失效,本课题的目的是建立反应区形成的数学模型,并定量模拟Ag-Cu钎料在空气中反应钎焊的组织演变动力学。 模拟应有助于识别那些控制形成动力学的过程,例如。G.氧或铜的扩散传输,或相边界的移动性。对微观结构形成的半定量理解可能会产生新的想法,即不希望的反应区的厚度如何受到合金成分或工艺条件变化的影响,例如通过施加不同的氧分压。在模型开发中,可以使用项目第一阶段的结果。至此,可以定量地模拟氧对Ag-Cu钎料合金相形成和凝固动力学的影响。相场模型已被扩展到计算DSC轨迹。这允许模拟的微观结构演变和测量的DSC扫描之间的定量比较。此外,本文还采用计算机辅助热力学和相场法,对钎料合金的熔化过程和相形成过程、钎料合金与BSCF陶瓷的相互作用以及Ag-Cu合金与含Cr钢的界面反应和相形成过程进行了模拟。没有一个全面的热力学数据库可用于所涉及的材料。应根据可用的文献数据和适当的近似值,开发简化的热力学描述,并使用项目合作伙伴的实验结果进行校准。因此,这个项目也提供了一个方法论的贡献,对热力学方法的建模不同材料的连接过程。

项目成果

期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Phase Field Modeling of Microstructure Formation, DSC Curves, and Thermal Expansion for AgCu Brazing Fillers Under Reactive Air Brazing Conditions
  • DOI:
    10.1002/adem.201400101
  • 发表时间:
    2014-12
  • 期刊:
  • 影响因子:
    3.6
  • 作者:
    M. Apel;G. Laschet;B. Böttger;R. Berger
  • 通讯作者:
    M. Apel;G. Laschet;B. Böttger;R. Berger
Phase Field Modeling Applied to Reactive Air Brazing: Investigating Reaction Kinetics with Focus on Oxygen Exchange
相场建模应用于反应空气钎焊:以氧交换为重点研究反应动力学
  • DOI:
    10.1002/adem.201400103
  • 发表时间:
    2014
  • 期刊:
  • 影响因子:
    3.6
  • 作者:
    Berger;Böttger
  • 通讯作者:
    Böttger
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Dr. Markus Apel其他文献

Dr. Markus Apel的其他文献

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{{ truncateString('Dr. Markus Apel', 18)}}的其他基金

Mechanisms and Process Model of Ultra-Refining of Metals by Crystallization via a rotating cooled cylinder
旋转冷却筒结晶超精炼金属的机理和过程模型
  • 批准号:
    421743304
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Development of a methodology for the quantitative prediction of the damage in to the diffusion layers of reactive air brazed BSCF-Steel-Joints
开发定量预测反应空气钎焊 BSCF 钢接头扩散层损伤的方法
  • 批准号:
    392944287
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Die quantitative Erfassung des Einflusses der Begleitelemente und Erstarrungsbedingungen auf die Veredelung von AlSi7Mg Gusslegierungen
定量测定伴生元素和凝固条件对AlSi7Mg铸造合金细化的影响
  • 批准号:
    190053621
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Zum Einfluss interdendritischer Erstarrungsporen auf die mechanischen Eigenschaften von Al-Legierungen
枝晶间凝固孔对铝合金力学性能的影响
  • 批准号:
    35307062
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Grain Refinement and Microstructure Formation by Inoculation
通过孕育处理晶粒细化和微观结构形成
  • 批准号:
    51298894
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Eutectic Al alloys with tailored solidification path to probe fundamental aspects of solidification in laser-based AM II
具有定制凝固路径的共晶铝合金,用于探测基于激光的 AM II 凝固的基本方面
  • 批准号:
    409726740
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes

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