The Effect of Silanisation on Microstructural Stability and Magnetic Properties of the Intermetallic Sm₂(Co, Fe, Cu, Zr)_17·

Abstract

The effects of silanising using the coupling agent γ-glycidoxpropyltrimethoxysilane on microstructural stability and magnetic properties of Sm-Co powder particles have been investigated. The silanisation provides structural stability by improving the oxidation resistance at 400oC for 10 hours. The untreated particles undergo microchemical changes by redistribution of alloying elements which mainly accumulate in parallel black and grey streaks in the interior of the particles. The silanised particles after heat treatment show coercivity of 836 Oe and the untreated particles show a much lower coercivity of 376 Oe. The difference in magnetic properties of uncoated particles is caused by diffusion of oxygen and microstructural instability.

A novel method for synthesizing narrow particle size distribution of holmium–doped strontium hexaferrite by sol-gel auto-combustion

“…Modern magnets have been used in industry since the 1980s mostly due to their low cost, high corrosion resistance, chemical stability, steadiness at relatively high temperatures, and propriety in a wide variety of applications [1][2][3][4][5][6][7]. M-type hexaferrite SrFe 12 O 19 is usually and essential ferromagnetic structure magnet that has been greatly studied because of its prominent applications in high density magnetic recording, microwave, and electronic devices [8][9][10].…”