VO2对刀具CVD金刚石涂层热应力的调节作用研究

徐洛; 杜星祝; 吴超逸; 金坚; 卢文壮

doi:10.16490/j.cnki.issn.1001-3660.2025.12.013

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表面技术 ›› 2025, Vol. 54 ›› Issue (12) : 145-151. DOI: 10.16490/j.cnki.issn.1001-3660.2025.12.013

精密与超精密加工

VO₂对刀具CVD金刚石涂层热应力的调节作用研究

徐洛, 杜星祝, 吴超逸, 金坚, 卢文壮^*

作者信息 +

Regulation of VO₂ on Thermal Stress of CVD Diamond Coating on Cutting Tools

XU Luo, DU Xingzhu, WU Chaoyi, JIN Jian, LU Wenzhuang^*

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摘要

目的通过降低热应力的方式,解决刀具CVD金刚石涂层在切削过程中易脱落的问题。方法使用热致相变材料VO₂作为硬质合金刀具与CVD金刚石涂层的中间层。建立M相VO₂ (333)晶胞模型和VO₂/金刚石涂层体系模型,采用分子动力学模拟的方法,模拟VO₂的相变过程并计算升温过程中涂层体系的热应力变化情况。制备了VO₂/CVD金刚石涂层,使用X射线应力分析仪对升温过程中的涂层应力变化进行实时测量。结果建立的VO₂模型在330 K附近发生相变,体系能量突变,内部原子位置发生变化。仿真结果显示,VO₂/金刚石界面模型热应力在323.15~373.15 K发生突变,涂层应力降低约400 MPa;试验结果显示,涂层VO₂在323.15~328.15 K发生突变,热应力降低约300 MPa,VO₂的相变温度和应力调控的试验结果与仿真结果趋势一致。结论加入VO₂中间层可降低CVD金刚石涂层的热应力,对提高刀具CVD金刚石涂层抗剥落能力具有重要意义。

Abstract

This study aims to reduce thermal stress with the thermotropic phase change material (PCM) VO₂ as an interlayer, to address the issue of easy detachment of CVD diamond coatings on cutting tools during the cutting process. To investigate the regulating effect of VO₂ on the thermal stress of CVD diamond coatings, molecular dynamics simulations are employed. A 3×3×3 supercell model of the M-phase VO₂ is established to simulate the phase transition process and calculate the phase transition temperature of the VO₂ model. Subsequently, a VO₂/diamond layer model is constructed, and the thermal stress within the layer model is calculated over a temperature range of 273.15 K to 523.15 K, yielding a temperature-stress curve for the VO₂/diamond layer model. The simulation results indicated that the established VO₂ model undergoes a phase transition at approximately 330 K, accompanied by a sudden change in the total system energy and a shift in internal atomic positions. This suggests that the VO₂ model undergoes structural changes near the phase transition temperature, demonstrating its thermotropic phase change capability. As the temperature increases, the thermal stress in the VO₂/diamond layer model gradually increases. However, near 373.15 K, the system stress abruptly decreases by approximately 400 MPa. Considering that the VO₂ supercell model undergoes a phase transition around 330 K, it can be inferred that the sudden stress drop is attributed to the phase transition of VO₂. After reaching the phase transition temperature, the atomic positions within VO₂ change, leading to a reduction in internal stress. The VO₂ films are prepared on YG8 cemented carbide substrates through PVD magnetron sputtering system, followed by the deposition of a CVD diamond coating by HFCVD to form the VO₂/diamond coating system. An X-ray stress analyzer is employed to measure the stress changes in the coating system during heating. The experimental results show that at an initial temperature of 303.15 K, the initial stress in the VO₂/CVD diamond coating is approximately 600 MPa lower than that of the CVD diamond coating used as a control group. As the system temperature increases, the thermal stress in the VO₂/CVD diamond coating system undergoes a sudden change between 323.15 K and 328.15 K, with a stress reduction of approximately 300 MPa. The experimental results regarding the phase transition temperature and stress regulation capability of VO₂ are consistent with the simulation trends. The VO₂ interlayer can reduce the initial thermal stress of the system and undergo a phase transition during heating, effectively lowering the thermal stress in the CVD diamond coating system, which is significant for enhancing the anti-spalling properties of CVD diamond coatings on cemented carbide cutting tools.

导出引用

徐洛, 杜星祝, 吴超逸, 金坚, 卢文壮. VO₂对刀具CVD金刚石涂层热应力的调节作用研究[J]. 表面技术. 2025, 54(12): 145-151 https://doi.org/10.16490/j.cnki.issn.1001-3660.2025.12.013

XU Luo, DU Xingzhu, WU Chaoyi, JIN Jian, LU Wenzhuang. Regulation of VO₂ on Thermal Stress of CVD Diamond Coating on Cutting Tools[J]. Surface Technology. 2025, 54(12): 145-151 https://doi.org/10.16490/j.cnki.issn.1001-3660.2025.12.013

中图分类号： TG174.4

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