Phase-field modeling of selective laser brazing of diamond grits
Phase-field modeling of selective laser brazing of diamond grits
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DOI：
10.1063/5.0049096
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发表时间：
2021-02
影响因子：
4.6
通讯作者：
Lu Li;Shuai Li;Bi Zhang;T. Fan
中科院分区：
文献类型：
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作者：
Lu Li;Shuai Li;Bi Zhang;T. Fan
金刚石磨粒具有优良的上级机械性能和加工硬质材料的性能，被广泛应用于切削、磨削和抛光工具中。金刚石磨粒的选择性激光钎焊（SLB）是一种新的增材制造技术，具有制造下一代高性能金刚石工具的巨大潜力。然而，对SLB工艺的设计和调整以及由此产生的键合效率的基本理解和定量分析尚未建立，因为该工艺由于加热、熔融、润湿、固化、砂砾迁移、键合、反应以及这些效应之间的相互作用而变得复杂。我们提出了一个物理上一致的相场理论模型，用于使用基于粉末的增材制造技术预测SLB在金刚石磨粒上的熔化和润湿。熔化动力学由填充有氩气的腔室中的激光加热驱动，并且与多个三相接触线的运动耦合。相关的润湿动力学，界面形态，和温度分布计算解决在一个简化的2D配置。
Diamond grit is widely used in cutting, grinding, and polishing tools for its superior mechanical properties and performance in machining hard materials. Selective laser brazing (SLB) of diamond grits is a new additive manufacturing technique that has great potential to fabricate the next generation of high-performance diamond tools. However, fundamental understanding and quantitative analysis for the design and tuning of the SLB process and the resulting bonding efficiency are not yet established as the process is complicated by heating, fusion, wetting, solidification, grit migration, bonding, reaction, and the interplay between these effects. We present a thermodynamically consistent phase-field theoretical model for the prediction of melting and wetting of SLB on diamond grits using a powder-based additive manufacturing technique. The melting dynamics is driven by laser heating in a chamber filled with argon gas and is coupled with the motion of multiple three-phase contact lines. The relevant wetting dynamics, interfacial morphology, and temperature distribution are computationally resolved in a simplified 2D configuration.