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Mo2NiB2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Mo2NiB2.在激光功率为2500W,扫描速度为1 mm/s的工艺条件下,获得了良好的Mo2NiB2金属基陶瓷涂层.
The Gibbs free energy of compounds and oxide in Mo-Ni-B ternary system was calculated.The results indicate that the presence of oxygen in the reaction process is very harmful to the synthesis of Mo2NiB2.The relationship between materials absorbed energy and laser output energy was analyzed based on the energy conservation law.Temperature field of laser in-situ cladding was simulated by using ANSYS software.The results show that the reaction mechanism of laser cladding in-situ synthesis is different from the sintering method.Mo2NiB2 ternary boride is produced when pure Mo,Ni and B are irradiated by laser beams.Mo2NiB2 ternary boride with good properties is obtained by laser cladding in-situ synthesis with laser power of 2500 W,and scanning speed of 1 mm/s.
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