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计算了Mo-Ni-B三元系生成化合物和氧化反应产物的吉布斯自由能。结果表明反应过程中氧的存在对合成Mo_2NiB_2有很大的危害。从能量守恒的角度分析了材料吸收能量与激光输出能量的关系。利用ANSYS模拟了激光熔覆原位合成法的温度场。结果表明该制备法与烧结法反应机制不同。大功率激光辐照下温度迅速升至材料熔点,纯物质Mo、Ni、B在液相下发生反应形成Mo_2NiB_2。在激光功率为2500 W,扫描速度为1 mm/s的工艺条件下,获得了良好的Mo_2NiB_2金属基陶瓷涂层。
The Gibbs free energies of the Mo-Ni-B ternary system-generated compounds and the oxidation reaction products were calculated. The results show that the presence of oxygen during the reaction has great harm to the synthesis of Mo_2NiB_2. From the viewpoint of energy conservation, the relationship between the energy absorbed by the material and the laser output energy is analyzed. The temperature field of laser cladding in situ synthesis was simulated by ANSYS. The results show that the preparation method and sintering reaction mechanism are different. Under high-power laser irradiation, the temperature rapidly rises to the melting point of the material, and the pure substances Mo, Ni and B react in the liquid phase to form Mo_2NiB_2. Under the condition of laser power of 2500 W and scanning speed of 1 mm / s, a good Mo_2NiB_2 metal matrix ceramic coating was obtained.