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Optimizing the Synthesis of Nanostructured Tungsten Carbide Powders by Effective Combination of Carbon Sources and Atmospheres

Raquel de Oro Calderon (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Raffaele Gilardi ; Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Luigi Alzati
9th International Conference on Tungsten, Refractory and Hardmaterials; Orlando; United States; 18 May 2014 through 22 May 2014 Vol. 1 Powder Production (2014), p. 1-11.
[Konferensbidrag, refereegranskat]

Nanostructured WC powders provide remarkable and technologically attractive properties due to the fine microstructures obtained after sintering. Synthesis of ultrafine WC powders from tungsten oxides can be achieved through a thermal activation of WO3+C mixes that promotes reduction and subsequent carburization. The maximum temperature of this process must be kept as low as possible in order to avoid excessive grain growth and agglomeration of particles. In this work, tungsten carbide powders have been synthesized from WO3 precursors combined with carbon sources with different characteristics (degree of crystallinity, specific surface area, etc.) under inert and reducing atmospheres (Ar and Ar-50%H2). Mixability of the different carbon sources with WO3 plays an important role in the subsequent thermal activation process. The effectiveness of the synthesis is discussed based on the effect of the type of carbon source used and the processing atmosphere.

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Denna post skapades 2014-11-13. Senast ändrad 2015-05-06.
CPL Pubid: 205765