Sendust

Sendust (Japanese: セ ン ダ ス ト) is a soft magnetic metal powder for magnetic cores , which was developed in 1936 at the Imperial University of Tōhoku in Sendai , Japan by the metallurgist Masumoto Hakaru as an alternative to permalloy in coils for telephone networks. The name is an artificial word and means dust from Sendai: Sen-dust. The Sendust alloy typically consists of 85% iron , 9% silicon and 6% aluminum . The powder is sintered into magnetic cores for coils . Sendust cores have high magnetic permeability , low magnetic losses and good temperature stability.

Sendust is harder than Permalloy and is therefore useful for applications that are prone to abrasion such as tape heads in audio recording devices . It is not suitable for modern applications in the field of video and data recording due to poor high frequency behavior.

literature

• EP Wohlfarth (Ed.): Handbook of Magnetic Materials. Volume 2, 3rd edition, Elsevier Science BV, Amsterdam 1999, ISBN 0-444-85312-X .
• Colonel Wm. T. McLyman: Transformer and Inductor Design Handbook. Taylor & Francis Group, Boca Raton 2011, ISBN 978-1-4398-3688-0 .

Web links

• Sendust properties
• Technical Bulletin High Frequency Sendust Material [1 .pdf] (accessed July 17, 2020)
• An Objective Comparison of Powder Core Materials for Inductive Components with Selected Design Examples (accessed July 17, 2020)
• Powder Material for Inductor Cores (accessed July 17, 2020)
• Magnetic Powder Cores (accessed July 17, 2020)