Abstract
Nano molybdenum powder has been applied in many industrial fields in forms of lubricant additives, metallurgical additives, powder sintering additives, and one of raw materials of electrical components, cleaner and smoke suppressor. The processes, mechanisms and prospects of its synthesis methods are comprehensively analysized, including plasma physical vapor deposition technology (PPVD), reduction of MoCl4 vapor, activated reduction technology, electro-explosion of molybdenum wire (Elex process), pulsed wire discharge technology, electron beam irradiating method, hybrid plasma process, vapor phase reduction of MoO3, and microwave plasma chemical vapor deposition (MPCVD), etc.
Highlights
Nano molybdenum powder has been applied in many industrial fields in forms of lubricant additives, metallurgical additives, powder sintering additives, and one of raw materials of electrical components, cleaner and smoke suppressor
3) Electrical applications: Addition of nano molybdenum powder has been shown to improve the properties of electric interconnects
1) Mechanical ball milling Whether carbon steel, stainless steel, or carbide alloy are produced to milling balls and container, Sanno Ju et al [14] [15] have fabricated nano molybdenum powder with particle diameter of about 6 nm by mechanical ball milling process
Summary
The important microstructural features of metals include a) grain size, distribution, and morphology, b) the nature and morphology of grain boundaries and interphase interfaces, c) the perfection and nature of intragrain defects, d) composition profiles across grains and interfaces, and e) identification of residual trapped species from processing. The structure of the grain boundaries is the same in both nanocrystalline and coarse grained materials. Because of the extremely small dimensions, a large volume fraction of atoms is located at the grain boundaries, which confers that the properties of nanocrystalline materials are very often superior to those of conventional polycrystalline coarse grained materials [1]. Molybdenum and molybdenum-based materials are widely used in chemical engineering, military, energy, electronics, bio-medicine and agriculture, for the properties of high yielding strength and hardness at high temperature, excellent thermal and electrical conductivities, good erosion-resistance, etc. Molybdenum-based nanostructured materials have sparked a worldwide interest because of their unique optical, electronic and mechanical properties and potential applications in nano devices and functional materials [4]. The extensive investigations in recent years on properties, synthesis methods and greatly potential applications of nano molybdenum powder are summarized
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