W-Y2O3 composite nanopowders prepared by freeze-drying method and its sintering characteristics
W-Y2O3 composite nanopowders prepared by freeze-drying method and its sintering characteristics
复制标题
冷冻干燥法制备W-Y2O3复合纳米粉体及其烧结特性
DOI：
10.1016/j.jallcom.2019.07.214
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发表时间：
2019-10
影响因子：
6.2
通讯作者：
Liu Yongchang
中科院分区：
文献类型：
--
作者：
Hu Weiqiang;Yu Liming;Ma Zongqing;Liu Yongchang
为了制备高性能氧化物弥散强化钨基合金，采用新型冷冻干燥法制备了W-Y2 O3复合前驱体粉末。所制备的W-Y2 O3复合粉末的平均W晶粒尺寸为14.2 nm，相应的晶粒尺寸分布极窄。低温烧结的W-Y2 O3合金具有约410 nm的超细W晶粒尺寸，同时保持了98.1%的较高烧结密度。具有W-Y-O扩散层的Y_2O_3颗粒（20-50 nm）和Y_2WO_6颗粒（<20 nm）均匀分布在W晶粒内，特别是在W晶界处。这些W-Y-O相吸附了游离氧杂质，使W基体得到净化和强化。Y2 WO 6颗粒与W基体之间形成共格或半共格界面，增强了相界结合强度。在上述因素的共同作用下，烧结态W-Y_2 O_3合金的硬度高达690.2 ± 32.0 HV_（0.2）。这些结果表明，冷冻干燥法和低温烧结法是制备超细晶高性能W-Y2 O3合金的一种很有前途的方法。
In order to prepare high performance oxide-dispersion-strengthened tungsten based alloys, the W-Y2O3composite powder precursors were synthesized by novel freeze-drying method. The average W grain size of prepared W-Y2O3composite powder is 14.2 nm, and corresponding grain size distribution is extremely narrow. The low-temperature sintered W-Y2O3alloys possess an ultrafine W grain size of about 410 nm while maintaining a comparatively high sintering density of 98.1%. The Y2O3particles (20–50 nm) with a W-Y-O diffusion layer and Y2WO6particles (<20 nm) distribute uniformly within W grains and especially at W grain boundaries. These W-Y-O phases adsorb free oxygen impurity, resulting in the purification and strengthening of W matrix. What's more, coherent or semi-coherent interfaces are observed between Y2WO6particles and W matrix, reinforcing the bonding strength of phase boundary. The combined action of the factors mentioned above leads to the hardness of sintered W-Y2O3alloys in our work as high as 690.2 ± 32.0 HV0.2. These results indicate that the freeze-drying method and subsequent low temperature sintering is a promising method for preparing high performance W-Y2O3alloys with ultrafine grains.
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影响因子：
6.2
作者：
Dong, Zhi;Liu, Nan;Liu, Yongchang
通讯作者：
Liu, Yongchang
DOI：
10.1016/j.nimb.2017.11.013
发表时间：
2018-01
影响因子：
1.3
作者：
Gang Yao;X. Tan;L. Luo;Xiang Zan;Liu Jiaqin;Qiu Xu;Xifao-Yong Zhu;Yucheng Wu
通讯作者：
Gang Yao;X. Tan;L. Luo;Xiang Zan;Liu Jiaqin;Qiu Xu;Xifao-Yong Zhu;Yucheng Wu
影响因子：
3.1
作者：
Zhangjian Zhou;Jun Tan;D. Qu;G. Pintsuk;M. Rödig;J. Linke
通讯作者：
Zhangjian Zhou;Jun Tan;D. Qu;G. Pintsuk;M. Rödig;J. Linke
DOI：
10.1063/1.3457516
发表时间：
2010-06
期刊：
--
影响因子：
--
作者：
A. Moitra;Sungho Kim;Seong-Gon Kim;S. Park;R. German;M. Horstemeyer
通讯作者：
A. Moitra;Sungho Kim;Seong-Gon Kim;S. Park;R. German;M. Horstemeyer
影响因子：
5.2
作者：
J. Koh;Erinn Sörge;Tzu-Chien Wen;D. Shetty
通讯作者：
J. Koh;Erinn Sörge;Tzu-Chien Wen;D. Shetty