The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 2025
Filed:
Feb. 01, 2023
Tianjin Sanhuan Lucky New Material Co., Ltd., Tianjin, CN;
Beijing Zhong KE San Huan Hi-tech Co., Ltd., Beijing, CN;
TIANJIN SANHUAN LUCKY NEW MATERIAL CO., LTD., Tianjin, CN;
BEIJING ZHONG KE SAN HUAN HI-TECH CO., LTD., Beijing, CN;
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.