Tungsten features a unique combination of properties which makes it a candidate for the use as a plasma-facing material in fusion reactors. The main drawbacks of tungsten are its brittleness at moderate temperature and the susceptibility to embrittlement during operation. To overcome this limitations tungsten fibre-reinforced tungsten composites (W_f/W) have been developed. The interlayer between the tungsten fibre and tungsten matrix enables the activation of extrinsic mechanisms to improve the toughness similar to ceramic fibre-reinforced ceramics. In addition, the evaluation of the interlayer parameter is a necessary for the efforts to model the composite behaviour. Therefore, single fibre model systems with Er${}_2$O${}_3$ and Y${}_2$O${}_3$ as interlayer were evaluated by push-out and pull-out tests. The results were used to determine the interfacial shear strength (${\tau }_{deb}$), the interfacial frictional shear stress (${\tau }_{fr}$) and the fracture energy of the interlayer (${\Gamma }_i$). In addition, tensile tests on the composite material were performed to evaluate the interfacial frictional shear stress. The evaluation methods were critically discussed as the results show that the influence of the evaluation method is larger than the actual tested interlayer material.

钨具有独特的特性组合，使其成为在聚变反应堆中用作面向等离子体的材料的候选材料。钨的主要缺点是它在中等温度下易脆，并且在操作过程中易脆化。为了克服这一限制，已经开发出钨纤维增强钨复合材料 (W _f /W)。钨纤维和钨基体之间的夹层能够激活外在机制，以提高类似于陶瓷纤维增强陶瓷的韧性。此外，层间参数的评估对于模拟复合行为的努力是必要的。因此，具有 Er 的单纤维模型系统${}_2$哦${}_3$ 和 Y${}_2$哦${}_3$作为中间层，通过推出和拉出测试进行评估。结果用于确定界面剪切强度（${\tau }_{d\mathrm{电子}乙}$), 界面摩擦剪应力 (${\tau }_{fr}$) 和夹层的断裂能 (${\Gamma }_{我}$）。此外，对复合材料进行拉伸试验以评估界面摩擦剪切应力。对评价方法进行了批判性讨论，结果表明评价方法的影响大于实际测试的夹层材料。