Study on tungsten sintering temperature field based on electromagnetic simulation and computational fluid dynamics

In order to study the influence of various sintering variables more intuitively and clearly, electromagnetic field analysis and computational fluid dynamics are used to analyze the influence of gas flow, heating power and other process parameters on the temperature range of medium-frequency sintering in this paper. The results indicate that the uniformity of temperature field is determined by the gas flow rate and heating power. When the heating power is 50 kW, the stable temperature drops about 10 K for every 1 m(3)center dot h(-1) increase of hydrogen flow. The peak value of the maximum temperature difference on the tungsten rods gradually increases with the increase of the hydrogen flow rate, and it appears slightly later. The temperature distribution of tungsten rods in furnace is similar with different hydrogen flow rate. At the same time, the closer to the furnace wall, the higher the temperature of the tungsten rod. The temperature difference between tungsten rods mainly occurred within 1 h after the beginning of heating. Increasing the heating power can improve the stable temperature, but has little effect on the heating time. Increasing heating power can increase the peak value of the maximum temperature difference on the tungsten rods, but has little effect on the occurrence time of the peak value of the maximum temperature difference on the tungsten rods. Increasing the heating power will increase the temperature difference of a single tungsten rod, but the temperature difference of a single tungsten rod never exceeds 65 K. This study can be used to guide the process optimization design. Combined with numerical simulation calculation, the sintering parameters with low energy consumption and high temperature uniformity can be quickly and effectively found, thus improving the microstructure and properties of sintered tungsten products.