CHEN Zhongmin
,
WANG Naxin
,
SONG Xiaoping
,
WANG XiaotianXi'an Jiaotong University
,
Xi'an
,
China Manuscript received 16 December
,
1993
金属学报(英文版)
The microstructure of Nd_(34)Fe_(60)O_(6) alloy was characterized by means of scanning electron microscope. Auger electron multiprobe, X-ray diffraction, differential thermal analyses and thermomagnetic analyses. It is found that the equilibrium microstructure of the alloy is composed of a Nd_(2)Fe_(17) matrix, an oxygen-containing Nd-rich phase and a Nd-Fe-O ternary ferromagnetic phase (referred to T_(1)). This phase forms via a peritectic reaction between Nd_(2)Fe_(17) and Nd-rich phase at 840 ℃ . Its composition is around Nd_(36)Fe_(54)O_(10) and Curie temperature 180℃ . The X-ray diffraction peaks can be indexed on a tetragonal cell with lattice parameter of a = 0.771nm and c = 2.228nm. This stable phase is believed to be transformed from the metastable phase (A_(1)) in Nd-Fe binary system as a result of oxygen introduced.
关键词:
Nd-Fe-O alloy
,
null
,
null
LIANG Yong LI Ruiguo Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
ChinaInstitute of Corrosion and Protection of Metals
,
Aademia Sinica
,
Shenyang
,
110015
,
China
材料科学技术(英文)
Recent advances in laser coating technology including laser cladding,laser surface alloying and laser vapour deposition in China are reviewed in this paper.
关键词:
laser
,
null
,
null
,
null
,
null
Yang LUO
材料科学技术(英文)
Due to continued growth in key markets, a broadening of application base and performance improvements, the market demands of NdFeB magnet increased steadily in 1998, and the global output of sintered NdFeB magnet exceeded 10,000 t, in spite of the economic recession in Asia. In 1998 China produced 3,850 t sintered NdFeB block magnet, with an annual growth rate of +22% over the output in 1997.
关键词:
Shaoxiong ZHOU
材料科学技术(英文)
The discovery of the first Fe-based ferromagnetic amorphous alloy in 1966 had made an impact on conventional magnetic materials because of its unique properties. Since then, a number of amorphous magnetic materials have been successfully developed and used in a wide variety of applications. A brief review of R & D activities on amorphous soft magnetic materials in China is given from the beginning to the present in a somewhat chronological order, followed by a brief introduction to their applications on electric and electronic industries. An analysis and a prospect of Chinese market of such amorphous materials are also presented.
关键词: