结晶器纳米硬质强化Ni基镀层合金成分性能数据集

连铸结晶器在服役时受到的钢坯摩擦、钢液腐蚀会造成质量损失，大大减少了结晶器的使用寿命。为延长其使用寿命，降低工业成本，需在Cu合金表面沉积一层保护层。电镀Ni-Co镀层具备优异的耐磨性、耐蚀性等，且与Cu合金基体热膨胀系数相似。电镀是一种在电解池中利用氧化还原反应，在阴极表面形成均匀致密镀层的技术。该技术具有工艺成本低、无基体形状限制、产率高等优点，被广泛应用于工业生产、电子器件等领域。在结晶器表面制备Ni-Co合金电镀层，可以提升表面强度、硬度、耐磨性和耐蚀性，从而延长结晶器使用寿命，具有重要的工程应用意义。 电镀Ni-20Co具有很高的强度，其强化机理来源于纳米晶粒和亚微米双尺度结构中的大量位错缠结和孪晶结构。温度升高会造成晶粒长大和强度下降，但温度低于300℃影响不大。Al2O3具有增硬效果，但会降低强度。对比电镀和熔炼、粉末冶金NiCo合金的组织与性能，探明电镀层的双尺度晶粒结构、位错晶界发射机制，以及纳米孪晶等的强化行为；纳米陶瓷颗粒进一步提高镀层硬度。通过纳米颗粒分散处理，提升镀层质量，镀层性能为：Rm≥927MPa,硬度≥608 HV; λ≥ 81.96 W/m•K; 室温摩擦系数≤0.208。During service, continuous casting molds suffer from billet friction and molten steel corrosion, which causes mass loss and greatly shortens their service life. To extend their service life and reduce industrial costs, it is necessary to deposit a protective coating on the surface of copper alloy substrates. Electroplated Ni-Co coatings exhibit excellent wear resistance, corrosion resistance and other properties, and have a similar coefficient of thermal expansion (CTE) to copper alloy substrates. Electroplating is a technique that utilizes redox reactions in an electrolytic cell to form uniform and dense coatings on the cathode surface. This technique features low process cost, no limitation on substrate shape, high production efficiency and other advantages, and is widely used in industrial production, electronic devices and other fields. Preparing Ni-Co alloy electroplated coatings on the surface of molds can improve surface strength, hardness, wear resistance and corrosion resistance, thereby extending the service life of molds, which has important engineering application significance. Electroplated Ni-20Co has high strength, and its strengthening mechanism originates from a large number of dislocation tangles and twin structures in the nanograin and submicron bimodal structure. Elevated temperature will cause grain growth and strength degradation, but the impact is negligible when the temperature is below 300 ℃. Alumina (Al₂O₃) has a hardening effect but reduces the coating strength. By comparing the microstructures and properties of electroplated, smelted and powder metallurgy Ni-Co alloys, the strengthening behaviors of the electroplated coating's bimodal grain structure, dislocation-grain boundary emission mechanism and nano-twins can be clarified; nanoceramic particles further improve the hardness of the coating. Through nanoparticle dispersion treatment to improve the coating quality, the properties of the coating are as follows: ultimate tensile strength Rm ≥ 927 MPa, Vickers hardness ≥ 608 HV; thermal conductivity λ ≥ 81.96 W/(m·K); coefficient of friction at room temperature ≤ 0.208.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于结晶器表面电镀Ni-Co合金层，通过纳米硬质强化技术提升其耐磨性、耐蚀性等性能，以延长使用寿命。数据涵盖了镀层的成分、组织、强化机理及关键性能指标，如强度、硬度和摩擦系数，具有重要的工程应用价值。