Abstract Effects of yttrium on the calcination of ammonium paratungstate (APT), reduction of tungsten oxide, carbonization of tungsten and sintering of cemented carbides were studied during the preparation of yttrium-doped cemented tungsten carbide. The phase compositions, particle sizes and morphologies of all the components were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy, respectively. The results showed that 1%Y-doped tungsten oxide consisted of WO3 and Y2WO6 phases. After hydrogen reduction, the size of Y-doped tungsten decreased remarkably and a yttrium barrier was observed in the cross-sectional morphology of the 1%Y-doped tungsten powder. During carbonization, a part of the Y2WO6 phase transformed to Y15C19 and WC. The flexural strength and fracture toughness of 1%Y-doped WC-6wt.%Co cemented carbide were 2458 MPa and 12.15 MPa m1/2, showing improvements of 18.97% and 8.87%, respectively. A refining mechanism for tungsten and a strengthening mechanism for WC-Co cemented carbides were proposed.

中文翻译：

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钇阻挡层对WC-Co硬质合金前驱体粉末制备及烧结块体性能的影响

摘要 在掺钇硬质合金制备过程中，研究了钇对仲钨酸铵(APT)煅烧、氧化钨还原、钨碳化和硬质合金烧结的影响。分别通过X射线衍射、扫描电子显微镜和透射电子显微镜研究了所有组分的相组成、粒径和形貌。结果表明，1%Y掺杂的氧化钨由WO3和Y2WO6相组成。氢还原后，掺 Y 钨的尺寸显着减小，1%掺 Y 钨粉的横截面形貌中观察到钇势垒。在碳化过程中，一部分 Y2WO6 相转变为 Y15C19 和 WC。1%Y 掺杂 WC-6wt 的弯曲强度和断裂韧性。%Co 硬质合金分别为 2458 MPa 和 12.15 MPa m1/2，分别提高了 18.97% 和 8.87%。提出了钨的细化机制和WC-Co硬质合金的强化机制。