Characteristics and microstructure of graphite encapsulated iron nanoparticles

Abstract

The graphite encapsulated α-Fe particles were prepared by reduction of stage-2 and stage-3 FeCl 3 graphite intercalation compounds (GICs) with metallic potassium. X-ray diffraction analysis (XRD), energy dispersive X-ray spectroscopy (EDS) investigation and transmission electron microscopy (TEM) observation show that the reduction products of stage-2 FeCl 3 -GICs contains more abundant α-Fe nanoparticles than those of stage-3. High-resolution TEM (HRTEM) observation reveals that the nanoparticle of α-Fe was polycrystals or twins, which was real or quasi two-dimension in shape, and whose space orientation was strictly controlled by the graphene. Based on the experiment results, a possible growth model of the graphite encapsulated α-Fe was proposed.

Meshing Stiffness Calculation and Analysis of the Cycloidal Pump’s Rotor

“…In the equation: r R is the outer rotor tooth profile uniform circular radius, 2 Z is the tooth number of outer rotor, 1 Z is the tooth number of inner rotor, e is the eccentricity, a is the outer rotor tooth profile radius, T is the parameter. Fig.…”

“…When the inner rotor meshing profile is inner concave, the inner rotor and outer rotor is internal contact, where the choose -. In the equation: a is the radius of curvature of outer rotor at contact point, that's the outer rotor tooth profile radius, F is the force at contact point, 1 P , 2 P is the cycloid inner rotor and outer rotor material's poisson ratio, 1 E , 2 E is the cycloid inner rotor and outer rotor material's elasticity modulus, B is the rotor tooth width. Due to the cycloid inner rotor and outer rotor material is the same, it can define…”

“…Reference [1] and [2] regard tooth inter-atomic forces and the displacement of mesh point in normal direction as direct ratio, which means the meshing stiffness is a fixed value. Due to the number of gear teeth of cycloidal pump rotor in the process of meshing is periodical change, its meshing force between the rotors is periodical.…”