Abstract
In order to prepare high performance tungsten used as plasma face material, a trace amount of ZrC was added into tungsten, and the densification behavior, properties and microstructure evolution of W-ZrC composites sintered at temperatures in the range of 1150∼2000 °C in flowing hydrogen atmosphere were investigated. Results show that W-ZrC composite powders begin to form fine tungsten grains at 1300 °C. The growth rate of grains is high below 1600 °C, and then slows down. The maximum relative density and tensile strength are 99.6% and 460 MPa under the optimum sintering process, respectively. ZrC particles are uniformly dispersed at grain boundaries and in grains interior with particle size from 0.1 μm to 2 μm. Minor ZrC can effectively prevent the migration of grain boundaries and refine grain sizes from 100 μm of pure tungsten to 30 μm of W-ZrC composites. Minor ZrC can change the fracture mode and improve the strength and toughness of tungsten.
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