To overcome the brittleness of tungsten, tungsten fiber-reinforced tungsten composites (W_f/W) have been developed using an extrinsic toughening mechanism. In this work, a novel type of W_f/W with porous matrix produced by field assisted sintering technology (FAST) is studied. The material is optimized regarding mechanical behavior, standing on the adjusting of matrix porosity and fiber mass fraction. Two series of samples with different matrix density and fiber mass fraction are prepared. Based on the mechanical testing, porous matrix W_f/W can represent a promising pseudo ductile behavior. Relatively lower matrix density is helpful to avoid a sudden load-drop during crack opening. The different fracture behavior is attributed to the different fiber/matrix interface bonding condition. By increasing fiber mass fraction from 20% to 50%, porous matrix W_f/W can facilitate improved mechanical properties regarding fracture toughness and strength. However, by further increasing the fiber mass fraction from 50% to 60%, a deterioration of mechanical properties is observed. The high porosity of porous matrix W_f/W causes a degradation of the thermal conductivity compared to conventional bulk tungsten. No significant change regarding thermal expansion coefficient is observed when decreasing the matrix density.

为了克服钨的脆性，已经使用外在增韧机理开发了钨纤维增强的钨复合材料（W _f / W）。在这项工作中，研究了一种新型的由场辅助烧结技术（FAST）生产的具有多孔基质的W _f / W。该材料在机械性能方面进行了优化，可以调节基质孔隙率和纤维质量分数。制备了两个具有不同基质密度和纤维质量分数的样品。根据机械测试，多孔基体W _f/ W代表有希望的伪延性行为。相对较低的基体密度有助于避免裂纹打开时突然的负荷下降。不同的断裂行为归因于不同的纤维/基质界面粘合条件。通过将纤维质量分数从20％增加到50％，多孔基质W _f / W可以促进改善的有关断裂韧性和强度的机械性能。然而，通过将纤维质量分数进一步从50％增加到60％，观察到机械性能的劣化。与传统的块状钨相比，多孔基质W _f / W的高孔隙率导致热导率降低。当降低基质密度时，没有观察到关于热膨胀系数的显着变化。