The synthesis of nonmagnetic Ni(W) solid solution derived from highly reactive ammonium paratungstate as the tungsten source
Abstract
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.
- Publication:
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Materials Science and Engineering Conference Series
- Pub Date:
- October 2018
- DOI:
- 10.1088/1757-899X/423/1/012029
- Bibcode:
- 2018MS&E..423a2029H