Synthesis of Ultra-Fine Grained Nd-Fe-B Magnetic Powder by the Control of DR Speed during HDDR Process

被引：6

作者：

Cha, Hee-Ryoung ^{[1
,3
]}

Lee, Jung-Goo ^{[1
]}

Baek, Youn-Kyoung ^{[1
]}

Yu, Ji-Hun ^{[1
]}

Kwon, Hae-Woong ^{[2
]}

Kim, Yang Do ^{[3
]}

机构：

[1] Korea Inst Mat Sci, Powder & Ceram Div, Chang Won 632831, South Korea

[2] Pukyong Natl Univ, Dept Mat Engn, Pusan 608739, South Korea

[3] Pusan Natl Univ, Sch Mat Sci & Engn, Pusan 609735, South Korea

来源：

KOREAN JOURNAL OF METALS AND MATERIALS | 2013年 / 51卷 / 05期

关键词：

magnetic materials; HDDR; grain refinement; ribrating-sample magnetometer (VSM); anisotropy; DISPROPORTIONATION; COERCIVITY;

D O I：

10.3365/KJMM.2013.51.5.371

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present study, the influence of desorption-recombination (DR) speed during hydrogenation-decomposition-desorption-recombination (HDDR) process on the microstructure and magnetic properties of Nd-Fe-B based magnetic powders has been studied. Nd-Fe-B based alloys were made by mold casting and homogenization heat treatment. They were then subjected to HDDR treatment. During DR reaction, pumping speed and time of hydrogenation were systematically changed to control the speed of DR reaction. It was found that the slower hydrogen desorption during DR reaction can result in a smaller grain size and significantly increases the magnetic properties of the powder. The coercivity and the remanence of the HDDR powders in the size range of 200-300 mu m was 12.4 kOe and 11.4 kG, respectively. In addition, the remanence was further increased to 12.0 kG by milling the powders down to 25-90 mu m, which resulted in (BH)(max) of 26.5 MGOe.

引用

页码：371 / 376

页数：6

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