By Topic

Pressure sintering of MnZn and NiZn ferrites

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Monforte, F.R. ; Ampex Corporation, Redwood City, Calif. ; Chen, R. ; Baba, P.D.

Polycrystalline MnZn and NiZn ferrites suitable for recording-head applications have been prepared by pressure sintering (hotpressing). General conditions for pressure sintering and details of the apparatus are described. Also discussed are the effects of grain size and temperature, in the normal range of glass bonding, on the magnetic and physical properties of pressure-sintered MnZn ferrite. It was observed that the strength of the ferrite increased with decreasing grain size in the range studied (15 to 500 μm). An opposite effect was noted for resistance to material wear. Increases in permeability up to 30 percent were obtained by relieving residual machining stresses with anneals in the 500 to 900°C range. Similar increases in strength were observed for low-temperature anneals. However, at temperatures higher than 500°C, the strength was reduced strongly, with the amount of the reduction being dependent upon the surface finish of the ferrite and its geometry. In general, strength was reduced with coarser surface finish and increasing surface-to-volume ratios. Data on material wear and hardness as functions of grain size and composition are presented. Improvement in performance of video recording heads fabricated of pressure-sintered MnZn ferrite as compared to Alfesil and single-crystal MnZn ferrite is also demonstrated.

Published in:

Magnetics, IEEE Transactions on  (Volume:7 ,  Issue: 3 )