The synthesis of nonmagnetic Ni(W) solid solution derived from highly reactive ammonium paratungstate as the tungsten source

4th International Conference on Applied Materials and Manufacturing Technology

材料科学;机械制造

Hong, Myongson^1,2 ; Xiu, Zhimeng^1,2 ; Sun, Xudong^1,2

Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, Liaoning

110819, China^1

Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning

110819, China^2

关键词: Ammonium paratungstate;    Contact areas;    Mutual diffusion;    Nonmagnetics;    Powder particles;    Solid phase reaction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/423/1/012029/pdf
DOI  :  10.1088/1757-899X/423/1/012029

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

An effective technique for making nonmagnetic Ni(W) solid solution using Ni and ammonium paratungstate (APT) as the starting materials was developed. It was found that powder particles using APT as the W source have larger contact area between W and Ni and higher activity, which is conducive to the mutual diffusion between Ni and W, leading to a faster solid phase reaction and higher content of W diffused into Ni. The value of magnetic saturation (Ms) of Ni(W) solid solution powders using APT as the tungsten source is nearly zero under the suitable diffusion condition (550 °C × 2 h +800 °C × 2 h in hydrogen), much lower than that when using W powder.