Effect of yttrium barrier on the preparation of precursor powders of WC-Co cemented carbide and properties of sintered bulk
Effect of yttrium barrier on the preparation of precursor powders of WC-Co cemented carbide and properties of sintered bulk
复制标题
钇阻挡层对WC-Co硬质合金前驱体粉末制备及烧结体性能的影响
DOI：
10.1016/j.jallcom.2018.01.379
复制
发表时间：
2018-04
影响因子：
6.2
通讯作者：
Zhu Hongbo
中科院分区：
文献类型：
--
作者：
He Wen;Tan Dunqiang;Kuang Hai;Li Yalei;Yang Xin;Zhu Hongbo
在制备掺钇硬质合金的过程中，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。采用x射线衍射、扫描电镜和透射电镜分别研究了各组分的相组成、粒径和形貌。结果表明，掺1% y的氧化钨由wo3相和y2wo6相组成。氢还原后，掺y钨的尺寸明显减小，在1%掺y钨粉的横截面形貌中观察到钇势垒。碳化过程中，部分y2wo6相转变为y15c19和WC。掺1% y的WC-6wt的抗弯强度和断裂韧性。%Co合金分别为2458 MPa和12.15 MPa m1/2，分别提高了18.97%和8.87%。提出了钨的精炼机理和WC-Co硬质合金的强化机理。
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 WO3and Y2WO6phases. 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 Y2WO6phase transformed to Y15C19and 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.
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DOI：
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