Zegai Ahmed-Ameur, Besharatloo Hossein, Ortega Pablo, Djerdjare Boubekeur, Ferrari Begoña, Sanchez-Herencia Antonio Javier
Laboratory of Materials Sciences and Engineering (LSGM), Faculty of Mechanical Engineering and Process Engineering, University of Sciences and Technology Houari Boumediene, Bab Ezzouar 16111, Algiers, Algeria.
Instituto de Cerámica y Vidrio, CSIC, Calle Kelsen 5, 28049 Madrid, Spain.
Materials (Basel). 2023 Jun 25;16(13):4584. doi: 10.3390/ma16134584.
This study investigates the sintering behaviour and properties of WC-based composites in which WC was mixed with W5vol%Ni in concentrations of 10vol% and 20vol%. Colloidal processing in water and spark plasma sintering were employed to disperse the WC particles and facilitate sintering. The addition of W5vol%Ni improved the sintering process, as evident from a lower onset temperature of shrinkage determined through dilatometric studies. All samples exhibited the formation of tungsten monocarbide (WC), with a more pronounced presence in the WC/20(W5vol%Ni) composite. Sintering reached its maximum rate at 1550 °C and was completed at 1600 °C, resulting in a final density exceeding 99.8%. X-ray diffraction analysis confirmed the detection of WC and WC phases after sintering. The observed WC content was higher than expected, which may be attributed to carbon diffusion during the process. Macro-scale mechanical characterisations revealed that the WC/10(W5vol%Ni) composite exhibited a hardness of 18.9 GPa, while the WC/20(W5vol%Ni) composite demonstrated a hardness of 18.3 GPa. Increasing the W5vol%Ni binder content caused a decrease in mechanical properties due to the formation of WC phases. This study provides valuable insights into the sintering behavior and properties of WC/W5vol%Ni composites, offering potential applications in extreme environments.
本研究调查了WC基复合材料的烧结行为和性能，其中WC与体积分数为5%的Ni以10%和20%的浓度混合。采用水相胶体加工和放电等离子烧结来分散WC颗粒并促进烧结。通过膨胀计研究确定，添加体积分数为5%的Ni改善了烧结过程，收缩起始温度较低就是明证。所有样品均呈现出碳化钨（WC）的形成，在WC/20（体积分数为5%的Ni）复合材料中更为明显。烧结在1550℃时达到最大速率，并在1600℃时完成，最终密度超过99.8%。X射线衍射分析证实了烧结后WC和WC相的检测。观察到的WC含量高于预期，这可能归因于过程中的碳扩散。宏观尺度的力学表征显示，WC/10（体积分数为5%的Ni）复合材料的硬度为18.9 GPa，而WC/20（体积分数为5%的Ni）复合材料的硬度为18.3 GPa。由于WC相的形成，增加体积分数为5%的Ni粘结剂含量会导致力学性能下降。本研究为WC/体积分数为5%的Ni复合材料的烧结行为和性能提供了有价值的见解，在极端环境中具有潜在应用。
