ART
BEAUTY & WELLNESS
CRAFT
CULTURE & HISTORY
ENTERTAINMENT
ENVIRONMENT
FOOD & DRINKS
REVERSE ENGINEERING
SCIENCES
SPORTS
TECHNOLOGY
WEARABLES
Barium Ferrite Disc Magnet: 1 mol BaCO3 to 3 mol Iron Oxide, 1330 °C (Went, Philips 1956, Ex. 2)
Omegatron (Wikimedia Commons) · CC BY-SA 3.0
Charlie

Created by

Charlie

28. October 2026DE
0
0
0
0
0

Barium Ferrite Disc Magnet: 1 mol BaCO3 to 3 mol Iron Oxide, 1330 °C (Went, Philips 1956, Ex. 2)

A barium ferrite with more iron oxide: 1 mol barium carbonate to 3 mol, made as in Example 1 and passed through a 1330 °C furnace in 20 minutes. Went's rod held 1,510 gauss with a coercive force of 2,080 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 2. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
Advanced
2 days

Instructions

1

Weigh barium carbonate and iron oxide

Weigh 201.1 g barium carbonate (1 mol) and 480.6 g ferric oxide (3 mol). Barium carbonate is poisonous if swallowed: gloves and a dust respirator.

Materials for this step:

Barium Carbonate (Witherite)Barium Carbonate (Witherite)201.1 g
Ferric OxideFerric Oxide480.6 g

Tools needed:

Balance ScaleBalance Scale
Rubber GlovesRubber Gloves
P100 RespiratorP100 Respirator
2

Mill with alcohol 13.5 hours, dry and sieve

Grind the mixture with alcohol in a ball mill for 13.5 hours, then dry it and sieve it.

Tools needed:

Iron Ball MillIron Ball Mill
Ethanol - Lab Grade, 95%Ethanol - Lab Grade, 95%
Drying OvenDrying Oven
SieveSieve
3

Knead with a binder and form

Mix 300 g of the powder with a binder such as polyvinyl alcohol (Went names it or nitrocellulose) into a kneadable mass. The patent extrudes rods about 3 mm across; ours: press discs at 1.5 tonnes per cm², as in its other examples. Dry them in air for about 24 hours.

Tools needed:

Polyvinyl Alcohol PowderPolyvinyl Alcohol Powder
Hydraulic PressHydraulic Press
Disc Pressing DieDisc Pressing Die
Drying OvenDrying Oven
4

Pass through a 1330 °C zone in 20 minutes

Sinter in air at 1330 °C by passing the pieces through a 10 cm hot zone at 5 mm per minute: 20 minutes in the heat.

Tools needed:

Tube FurnaceTube Furnace
Heat-Resistant GlovesHeat-Resistant Gloves
5

Magnetise the discs

The patent gives no magnetising method. Ours: lay a disc with its faces against the poles of a strong electromagnet, switch the current on, then off. Find which face is north with a compass.

Tools needed:

ElectromagnetElectromagnet
CompassCompass

Materials

2

Tools Required

14

This blueprint makes

Thumbnail
Placeholder

Disc Magnet

Free

0
0
1

Related Blueprints

These blueprints share knowledge with this one — techniques, materials, or principles that connect them in the learning graph.

Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

Barium Ferrite Disc Magnet: Barium Carbonate and Iron Oxide Sintered (Went, Philips 1956)

by CharlieDE

Industrial

0
0
0
0
0
0

CC0 Public Domain

This blueprint is released under CC0. You are free to copy, modify, distribute, and use this work for any purpose, without asking permission.

Support the Maker by purchasing products through their Blueprint where they earn a Maker Commission set by Vendors, or create a new iteration of this Blueprint and include it as a connection in your own Blueprint to share revenue.

Discussion

(0)

Log in to join the discussion

Loading comments...