Effects of process parameters on tungsten boride production from WO3 by self propagating high temperature synthesis

Yazici, Sertac; Derin, Bora

doi:10.1016/j.mseb.2012.10.008

Cited by 11 publications

(9 citation statements)

References 19 publications

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“…However, no WB4 formation was detected in the product. The Rietveld analysis results given in Table 1 indicate that the quantity of Mg3B2O6 was almost two times higher than that of MgO in the SHS product [19]. Fig.…”

Section: Resultsmentioning

confidence: 87%

“…XRD scan for the unleached SHS product which are selected for the present study are shown in Fig. 2 [19]. The figure depicts that the phases occurred in SHS product were metallic W, W2B, WB, W2B5, MgO, and Mg3B2O6.…”

Section: Resultsmentioning

confidence: 99%

“…The chemical composition of the initial raw materials and the experimental procedure for the first-SHS are also described elsewhere [19]. In the study, WO3 (Alfa Aesar Co., 99.8 % pure with particle size < 106 µm), B2O3 (99 % pure with particle size < 53 µm) and Mg (99.7 % pure with particle size < 150 µm) powders were used.…”

Section: Experimental Studymentioning

confidence: 99%

“…Depending on the raw materials used for the SHS process, acid leaching may be required to eliminate unwanted compounds in the SHS product [18]. In our previous studies, we produced tungsten boride product as a mixture of W2B, WB, and W2B5 by SHS method and following acid leaching techniques starting from CaWO3 or WO3 as cheap sources of tungsten [18,19]. It was concluded in the studies that, even if the simultaneous additions of B2O3 and Mg to the initial mixture increased the atomic ratio of boron to tungsten in the boride formations, single step SHS was not enough to eliminate all metallic tungsten and sub-borides such as W2B and WB due to the nature of SHS.…”

Section: Introduction mentioning

confidence: 99%

“…The present process, named D-SHS, covers a leaching and second SHS/leaching trials on the previously produced SHS product [19]. The aim is to increase B/W ratio and to obtain a final product with high grade of W2B5 which has notable improvements in mechanical properties and wear resistance of some composites [7,20].…”

Section: Introduction mentioning

confidence: 99%

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Enrichment of W2B5 from WO3 and B2O3 by Double SHS Method

Derin

Yazici²

2018

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A second self-propagating high-temperature synthesis (SHS) was carried out to enrich the W2B5 content in the SHS product containing a mixture of various tungsten boride compounds. In the experiment, the process called Double-SHS (D-SHS) was conducted in two steps. In the first SHS reaction, an initial molar composition ratio of WO3:B2O3:Mg mixture was selected as 1:3:8. The product was then hot-leached with hydrochloric acid to eliminate MgO and Mg3B2O6 phases. The leached product, consisting of 72.6 wt.% W2B5, 16.1 wt.% WB, 8.4 wt.% W2B, and 2.9 wt.% W, was again reacted with the Mg and B2O3 mixture by second SHS. After another acid leaching step, W2B5 content in the D-SHS product was found to be 98.2 wt.%. The study showed that D-SHS is an effective method for boron enrichment in the tungsten compounds.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Studymentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

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Enrichment of W2B5 from WO3 and B2O3 by Double SHS Method

Derin

Yazici²

2018

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Low‐Temperature Synthesis of Hafnium Diboride Powder Via Magnesiothermic Reduction in Molten Salt

Bao

Massey

Huang

et al. 2018

Proceedings of the 41st International Conference on Advanced Ceramics and Composites

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Preparation and Characterization of Amorphous W–B–C Alloy and Solid Solutions of C in Tungsten Borides

Sun

Bai

Yao

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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Mixtures of W and B 13 C 2 powders were mechanically milled and subsequently annealed at 900-1200°C. It is found that amorphous W-B-C alloy formed as the mixtures were milled for 20-80 h. After annealing the 80 h-milled mixtures at 900-950°C, solid solutions of C and/or B in tungsten [W(B, C)], C in tungsten boride [W 2 B(C) or WB(C)] formed by the crystallization of amorphous W-B-C. The formation temperature of W 2 B(C) and WB(C) is lower than that of W 2 B and WB reported previously. As the 80 h-milled mixtures were annealed at 1200°C, W reacted with amorphous W-B-C completely to form WB and W 2 B 5 or W 2 B 5 instead of the solid solutions of C in tungsten borides, which is determined by the mole ratio of W to B 13 C 2. The formation mechanisms of the W 2 B(C) and WB(C) solid solutions as well as phase transition rules of the mixtures at annealing temperature and mole ratio were also investigated using first-principle calculation.

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Effects of process parameters on tungsten boride production from WO3 by self propagating high temperature synthesis

Cited by 11 publications

References 19 publications

Enrichment of W2B5 from WO3 and B2O3 by Double SHS Method

Enrichment of W2B5 from WO3 and B2O3 by Double SHS Method

Low‐Temperature Synthesis of Hafnium Diboride Powder Via Magnesiothermic Reduction in Molten Salt

Preparation and Characterization of Amorphous W–B–C Alloy and Solid Solutions of C in Tungsten Borides

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