Cast AlNiCo Magnets

The majority of AlNiCo magnets are cast, and AlNiCo 5 is the most commonly used grade among them. Cast AlNiCo magnets are made using standard foundry processes. Molten AlNiCo alloys with varying chemical compositions are melted in an induction furnace and poured into resin-bonded sand molds, after which the solidified material with a rough surface undergoes heat treatment and cooling.

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The majority of AlNiCo magnets are cast, with AlNiCo 5 being the most commonly used grade. Cast AlNiCo magnets are produced through standard foundry processes. Molten AlNiCo alloys with specific chemical compositions are melted in an induction furnace and poured into resin-bonded sand molds. Once solidified, the rough-surfaced material undergoes heat treatment and cooling.

Cast AlNiCo magnets generally exhibit slightly higher magnetic performance than sintered AlNiCo magnets. These magnets can be classified as isotropic or anisotropic, depending on whether an orienting magnetic field is applied during the cooling process. To maximize magnetic properties, most cast AlNiCo magnets are made anisotropic. After the heat treatment process, the AlNiCo blanks are machined to achieve precise geometry and tolerances.

product-2346-800

product-1349-616

Manufacturing Process

product-1701-535

Magnetic Properties

Grade	Remanence		Coercivity		Max. Energy Product		Temperature Coefficient		Curie Temperature	Max. Operating Temperature	MMPA Standard
	Br		Hcb		(BH)max		％/℃		Curie Temperature	Max. Operating Temperature
	mT	Gs	kA/m	Oe	kJ/m3	MGOe	Br	Hcj	℃	℃
LN10	600	6000	40	500	10	1.2	-0.02	-0.03	810	450	AlNiCo3
LNG12	700	7000	44	550	12	1.5	-0.02	-0.03	810	450	AlNiCo2
LNG13	680	6800	48	600	13	1.63	-0.02	-0.03	810	450	AlNiCo2
LNG18	900	9000	48	600	18	2.25	-0.02	-0.03	850	450	AlNiCo4
LNG37	1200	12000	48	600	37	4.63	-0.02	-0.03	860	525	AlNiCo5
LNG40	1250	12500	48	600	40	5	-0.02	-0.03	860	525
LNG44	1250	12500	52	650	44	5.5	-0.02	-0.03	860	525
LNG52	1300	13000	56	700	52	6.5	-0.02	-0.03	860	525	AlNiCo5DG
LNG60	1330	13300	60	750	60	7.5	-0.02	-0.03	860	525	AlNiCo5-7
LNGT18	580	5800	90	1130	18	2.25	-0.02	-0.03	860	550	AlNiCo7
LNGT28	1000	10000	58	720	28	3.5	-0.02	-0.03	860	525	AlNiCo6
LNGT32	800	8000	100	1250	32	4	-0.02	-0.03	860	550	AlNiCo8
LNGT38	800	8000	110	1380	38	4.75	-0.02	-0.03	860	550
LNGT44	850	8500	120	1500	44	5.5	-0.02	-0.03	860	550
LNGT48	900	9000	120	1500	48	6	-0.02	-0.03	860	550
LNGT60	950	9500	110	1380	60	7.5	-0.02	-0.03	860	550
LNGT72	1050	10500	112	1400	72	9	-0.02	-0.03	860	550	AlNiCo9
LNGT88	1100	11000	115	1450	88	11	-0.02	-0.03	860	550	AlNiCo9
LNGT36J	700	7000	140	1750	36	4.5	-0.02	-0.03	860	550	AlNiCo8HC

FAQ

Q1: What are the advantages of AlNiCo magnets?

A1:

High-temperature resistance: Can function effectively at temperatures up to 550°C (1022°F).
Corrosion resistance: Naturally resistant to oxidation, requiring no additional coating.
Magnetic stability: Retains magnetism over time, even in harsh environments.
Good machinability: Can be easily shaped, drilled, or cut to meet specific requirements.
Variety of shapes: Available in bar, horseshoe, ring, and disc shapes for versatile applications.
Strong residual induction: High magnetic flux density suitable for precision uses.

Q2: What are the uses of AlNiCo magnets?

A2:

Electronic applications: Used in sensors, actuators, and electric meters for their stability.
Automotive industry: Found in ignition systems, speedometers, and electric vehicle motors.
Aerospace: Essential for instruments and navigation systems in high-temperature conditions.
Industrial equipment: Utilized in magnetos, generators, and separators.
Medical devices: Incorporated in MRI machines and diagnostic tools.
Musical instruments: Widely used in electric guitar pickups and microphones.
Research and education: Ideal for experiments and teaching due to their durability.
Magnetic assemblies: Employed in clamping systems, magnetic chucks, and lifting devices.