Mechanochemistry approach to produce in-situ tungsten borides and carbides nanopowders: Experimental study and modeling

• Published in: Materials chemistry and physics 2019-02, Vol.224, p.47-64
• Main Authors: Bahrami-Karkevandi, M., Nasiri-Tabrizi, B., Wong, K.Y., Ebrahimi-Kahrizsangi, R., Fallahpour, A., Saber-Samandari, S., Baradaran, S., Basirun, W.J.
• Format: Article
• Language: English
• Subjects: Adaptive systems; Artificial intelligence; Artificial neural networks; Borides; Boron oxides; Dislocation density; Fuzzy logic; Fuzzy systems; In situ leaching; Leaching; Mechanochemistry; MSRs; Multilayers; Nanoflowers; Phase transitions; Predictive intelligent-based techniques; Statistical analysis; Tungsten borides and carbides; Tungsten carbide
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2018.12.003

Mechanically-induced self-sustaining reactions (MSRs) in WO3B2O3MgC powder mixtures were investigated in terms of reductant content. Also, two different predictive intelligent-based techniques including Adaptive Neuro-Fuzzy Inference System (ANFIS) and Multi-Layer Perceptron Artificial Neural Network (MLP-ANN) were developed to estimate the structural features of the mechanosynthesized powders, where different statistical analysis were performed to prove the precision and robustness of proposed models. The phase compositions were changed as the concentration of ductile reductant (Mg) reduced in the system. Accordingly, the fraction of crystalline phases was dramatically altered after the leaching process. The structural assessment showed that the dislocation density significantly varied as the graphite content increased, however, the rate of these alterations was not linear. FESEM observations indicated that the leached product had a typical flower-like cluster configuration, which consisted of loosely organized nano-sheets with a side length and thickness of around 250 and 12 nm, respectively. Meanwhile, the results achieved from the intelligent-based techniques showed that both ANFIS and ANN are very powerful in estimating the structural characteristics of the mechanosynthesized powders. However, ANFIS was more accurate than MLP-ANN. [Display omitted] •Mechanically-induced self-sustaining reactions in WO3B2O3MgC system were studied.•High-purity nanocomposites were obtained after 1 h of milling and subsequent leaching.•A bimodal particle size distribution was observed.•Flower-like cluster structure consisted of loosely arranged nano-sheets.•Two different modeling methodologies were developed to predict the structural features.