Neodymium-iron-boron sintered magnet and method of anti-corrosion treatment
AssigneesTianjin Sanhuan Lucky New Material Co., Ltd., Beijing Zhong Ke San Huan Hi-Tech Co., Ltd.
InventorsXiaogang Bai, Haihua Yu, Guanghui Pan, Xue Han
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Abstract
An anti-corrosion treatment method for preparing sintered NdFeB magnet includes preparing a sintered NdFeB matrix, and applying a heat treatment to the sintered NdFeB matrix in an oxidizing atmosphere containing at least one of alcohol or organic acid. A ratio of oxygen partial pressure to water vapor partial pressure in the oxidizing atmosphere is in a range from 1:1 to 300:1. A temperature for the heat treatment is equal to or lower than 300° C. A time for the heat treatment is in a range from 10 minutes to 200 minutes.
Claims8
An anti-corrosion treatment method for preparing a sintered NdFeB magnet comprising:
- preparing a sintered NdFeB matrix;
- immersing the sintered NdFeB matrix in an aqueous solution containing at least one of an alcohol or an organic acid to coat a surface of the NdFeB matrix with the aqueous solution;
- and
- applying a heat treatment to the coated NdFeB matrix in an oxidizing atmosphere;
- wherein:
- a ratio of oxygen partial pressure to water vapor partial pressure in the oxidizing atmosphere is in a range from 1:1 to 300:1;
- a temperature for the heat treatment is equal to or lower than 300°C;
- and
- a time for the heat treatment is in a range from 10 minutes to 200 minutes.
An anti-corrosion treatment method for preparing a sintered NdFeB magnet comprising:
- preparing a sintered NdFeB matrix;
- placing the sintered NdFeB matrix in an oxidizing atmosphere including water vapor that contains at least one of an alcohol or an organic acid;
- and
- applying a heat treatment to the NdFeB matrix in the oxidizing atmosphere;
- wherein:
- a ratio of oxygen partial pressure to water vapor partial pressure in the oxidizing atmosphere is in a range from 1:1 to 300:1;
- a temperature for the heat treatment is equal to or lower than 300°C;
- and
- a time for the heat treatment is in a range from 10 minutes to 200 minutes.
Dependencies are inferred from the claim text.