Study of processing routes for WC-MgO composites with varying MgO contents consolidated by FAST/SPS

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• 作者：Markus Radajewski^a ; ^{Markus.Radajewski@iwt.tu-freiberg.de} ; Christian Schimpf^b ; Lutz Kr&uuml ; ger^a
• 关键词：FAST/SPS ; Ceramic matrix composites ; WC-MgO ; X-ray diffraction ; Mechanical properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：May 2017
• 年：2017
• 卷：37
• 期：5
• 页码：2031-2037
• 全文大小：2725 K
• 卷排序：37

文摘

Two different preparation routes were applied to process WC-MgO composites with varying MgO contents (4.1 wt.% and 5.9 wt.% MgO). WC-MgO powder mixtures were synthesized by a milling process at 600 rpm for 6 h of partially oxidized WC (WC + WO3), Mg3N2 and C. Alternatively, WC and MgO as initial powders were used. For consolidation of the powder mixtures the field-assisted sintering technology (FAST) was used. X-ray diffraction shows that samples out of different powder mixtures and sintered between 1600 °C and 1750 °C exhibited WC, MgO and the W2C phase independent of the preparation route of the powder mixtures. A higher density and better mechanical properties (hardness and indentation fracture toughness) of WC-MgO were achieved of pure WC and MgO as initial powders were consolidated by FAST. It was found that a lower MgO content results in higher hardness values and in a slightly decreased indentation fracture toughness.