Key Takeaways & Executive Findings
- •• • MDTM technology enables high-density TiB2 nucleation at medium disperser rotation speeds (100–150 r/min), yielding refined particles, whereas low speeds (0–50 r/min) cause coarse particles and high speeds (150–200 r/min) induce coarsening due to weakened nucleation driving force. • • A quantitative model linking TiB2 particle size to disperser rotation speed and reactant solute concentration was established, enabling predictive control of particle refinement. • • The synergy of melt dispersion (reducing initial droplet size) and turbulent mixing (enhancing solute convection) is critical for achieving high-density nucleation and uniform distribution of TiB2 particles. • • The optimized MDTM process offers a scalable, controllable route for fabricating high-performance Cu-TiB2 composites with improved electrical conductivity and mechanical properties, addressing limitations of conventional liquid-phase in-situ methods.
Abstract
Conventional liquid-phase in-situ synthesis of Cu-TiB2 composites often suffers from coarse and non-uniformly distributed reinforcements, stemming from insufficient understanding and control over the in-situ nucleation and growth mechanisms of TiB2 particles. This study introduces a novel melt dispersion-turbulent mixing (MDTM) in-situ reaction technology to fabricate high-performance Cu-TiB2 composites. The MDTM strategy synergistically refines reaction micro-regions by reducing the initial melt droplet size via melt dispersion while enhancing solute convection via turbulence, promoting high-density nucleation and refinement of TiB2 particles. Based on turbulence characteristics and in-situ reaction kinetics, we optimized the melt disperser parameters and established a quantitative model linking particle size to disperser rotation speed and reactant solute concentration. It was found that disperser rotation speed governs three distinct nucleation and growth mechanisms for TiB2 particles. Low-density nucleation at low disperser rotation speeds (0–50 r/min) leads to coarse TiB2 particles. At medium rotation speeds (100–150 r/min), the refinement of micro-regions in the dual-melt reaction achieves high-density TiB2 nucleation. Conversely, at high rotation speeds (150–200 r/min), intense turbulence weakens the nucleation driving force and induces TiB2 particle coarsening. This work provides new insights into liquid-phase in-situ reaction mechanisms and offers a novel, controllable route for fabricating high-performance micro/nano particle-reinforced metal matrix composites.
1. Introduction
Copper matrix composites reinforced with TiB2 particles are highly sought after for applications in electronic packaging, thermal management, rail transit, and aerospace due to their excellent combination of thermal conductivity, electrical conductivity, and mechanical properties. However, conventional liquid-phase in-situ synthesis methods suffer from coarse and non-uniformly distributed reinforcements, which degrade performance. The root cause lies in inadequate understanding and control over the in-situ nucleation and growth mechanisms of TiB2 particles, particularly the influence of reaction interface state and mixing dynamics.
This study introduces a novel melt dispersion-turbulent mixing (MDTM) in-situ reaction technology that addresses these bottlenecks by synergistically refining reaction micro-regions through melt dispersion (reducing initial droplet size) and enhancing solute convection via turbulence. This approach promotes high-density nucleation and refinement of TiB2 particles, overcoming the limitations of existing methods. By optimizing disperser parameters and establishing a quantitative model linking particle size to rotation speed and solute concentration, the work provides a controllable route for fabricating high-performance micro/nano particle-reinforced metal matrix composites.
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Tao Zhou, Liuxin Qin, Yanbin Jiang, Wei Chen, Jing He, Lin Su, Shifang Li, Rongjia Yu, Tianze Hu, Meng Wang, Zhu Xiao, Yanlin Jia, Qian Lei, Zhou Li (2026). Nucleation and growth mechanisms of TiB2 particles in copper matrix composites prepared by melt dispersion-turbulent mixing in-situ reaction method. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3993-y
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Frequently Asked Questions
What are the specific rotation speed thresholds that delineate the three nucleation and growth regimes for TiB2 particles?
The study identifies three regimes: low speeds (0–50 r/min) result in low-density nucleation and coarse particles; medium speeds (100–150 r/min) achieve high-density nucleation and refined particles; high speeds (150–200 r/min) induce particle coarsening due to weakened nucleation driving force from intense turbulence.
How does the MDTM method quantitatively control TiB2 particle size?
A quantitative model was established linking particle size to disperser rotation speed and reactant solute concentration, allowing predictive control of particle refinement. The model is based on turbulence characteristics and in-situ reaction kinetics.
What are the industrial scalability implications of the MDTM process?
The MDTM process is a liquid-phase in-situ reaction method that is low-cost and potentially scalable for large-scale production of Cu-TiB2 composites, addressing the scalability issues of other methods like mechanical alloying or selective laser melting.
What are the key microstructural features achieved with the optimized MDTM parameters?
At medium rotation speeds (100–150 r/min), the process yields high-density nucleation and refined TiB2 particles, leading to improved uniformity and mechanical/electrical properties compared to conventional methods.
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