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利用Gleeble-3500D热模拟机,通过对硬质合金WC-Co粉末压坯分别以15、50和200℃/s的预设升温速度和800、900和1000℃的预设烧结温度进行解析实验,研究了硬质合金WC-Co体系在电场作用下烧结成形的动力学特点。实验表明,在电场和热场的共同作用下,预设升温速度和预设烧结温度会影响体系的固相扩散和液相的产生,从而影响压坯的致密性。本实验以50℃/s的预设升温速度,800℃的预设烧结温度进行无压烧结时,获得了最致密的烧结体。
Using the Gleeble-3500D thermal simulator, the WC-Co powder compact was analyzed by the preset heating rate of 15, 50 and 200 ℃ / s and the preset sintering temperature of 800, 900 and 1000 ℃ respectively. The dynamic characteristics of cemented carbide WC-Co system sintered under electric field were studied. Experiments show that under the combined action of electric field and thermal field, the preset heating rate and the pre-set sintering temperature will affect the solid-phase diffusion and liquid phase of the system, thus affecting the compactness of the compact. In this experiment, the most compact sintered body was obtained when the pressureless sintering was carried out at the preset heating rate of 50 ℃ / s and the preset sintering temperature of 800 ℃.