Permanent magnet AlNiCo is an alloy of iron in which aluminum, nickel, cobalt, and a small amount of other magnetic enhancing ingredients are added in addition to iron.AlNiCo alloy has high coercivity and high Curie temperature. AlNiCo disc magnet is hard and brittle and cannot be cold worked. It must be made by casting or sintering process. AlNiCo can produce a magnetic field of up to 0.15 Tesla. For an example of an intermediate anisotropic cast Al nickelco alloy, the composition of AlNiCo-6 is 8% Al, 16% Ni, 24% Co, 3% Cu, 1% Ti, and the rest are Fe. AlNiCo-6 has a BHmax of 3.9 megagauss-oesteds (MG·Oe), a coercivity of 780 oersted, a Curie temperature of 860 °C, and a maximum operating temperature of 525 °C.Before the discovery of rare earth magnets in the 1970s, this magnet was the strongest material for permanent magnets.

AlNiCo disc magnet has the advantages of high remanence (up to 1.35T), low coercivity (usually less than 160kA/m) and nonlinear demagnetization curve, so AlNiCo disc magnet is easy to be magnetized, but also easy to demagnetize. Special attention should be paid to its particularity in the design and manufacture of magnetic circuit of devices, and the magnet must be stabilized in advance. It is strictly prohibited to contact with any ferromagnetic material during use, so as not to cause local irreversible demagnetization or distortion of flux density distribution.

Among all permanent magnet materials, AlNiCo disc magnet has the lowest reversible temperature coefficient.It also has good temperature stability and aging stability, and is suitable for making instruments, motors, electroacoustic devices, magnetic machinery, etc.

Characteristic

AlNiCo disc magnets are available both in cast and sintered forms. Mainly used in applications where temperature stability is critical, AlNiCo magnets exhibit high Br, but low Hc, and BHmax in the 5 MGOe range. They are the most temperature stable magnets of all magnet types, and may be used with no significant losses up to about 500⁰C. They are relatively easily demagnetized, resisting oxidation well. Energy product ranges from 1.4 MGOe to about 7.5 MGOe.

Most of AlNiCo magnet grades are anisotropic (they can only be magnetized in a single axis / direction) – they are the more powerful magnet grades of Alnico. The others are isotropic (they can be magnetized in any direction or directions) – they are weaker but offer more design and performance flexibility.

Application

AlNiCo disc magnets are used in a wide range of applications, especially those that require the ability to withstand operating temperatures up to 1,000⁰F (540⁰C). By comparison, samarium cobalt magnets can operate up to about 600⁰F (315⁰C), while neodymium magnets are limited to approx. 428⁰F (220⁰C).

• Very high temperature applications

• Use in hot oils

• Clamping

• Motors and Generators

• Mass spectrometers

• Precision sensors and meters

• Aerospace

Typical Magnetic Performance for Sintered AlNiCo magnet

Grade	Remanence		Coercive Force		Max Energy		Density	Similar MMPA Standard	Temp. Coeff. of Br	Curie Temp.	Max. Working Temp.
	Br		Hcb		(BH)max		Density		Temp. Coeff. of Br	Curie Temp.	Max. Working Temp.
	mT	Gs	KA/ m	Oe	KJ/ m³	MGOe	g/cm³		%/°C	°C	°C
*FLN8	520	5200	40	500	8	1.00	6.7	AlNiCo 3	-0.022	760	450
*FLNG12	700	7000	40	500	12	1.50	7	AlNiCo 2	-0.014	810	450
*FLNG14	570	5700	76	950	14	1.75	7.1	AlNiCo 4	-0.02	850	450
*FLNG18	560	5600	88	1100	18	2.25	7.2	AlNiCo 7	-0.02	850	450
FLNG26	900	9000	56	700	26	3.25	7.2	AlNiCo 6	-0.02	850	450
FLNG28	1050	10500	46	580	28	3.50	7.2	AlNiCo 5	-0.016	850	450
FLNGT31	780	7800	104	1300	31	3.90	7.2	AlNiCo 8	-0.02	850	450
FLNG34	1100	11000	50	630	34	4.30	7.2	AlNiCo 5	-0.016	890	450
FLNGT36	680	6800	135	1700	36	4.50	7.2	AlNiCo 8	-0.011	850	450
FLNGT38	800	8000	123	1550	38	4.75	7.2	AlNiCo 8	-0.02	850	450
FLNGT42	880	8800	122	1530	42	5.25	7.2	AlNiCo 8	-0.02	850	450
FLNGT33J	700	7000	140	1750	33	4.13	7.2	ALNICO8HC	-0.025	850	450

*=Isotropic Other=Anisotropic

Typical Magnetic Performance for Cast AlNiCo

Grade	Remanence		Coercive Force		Max Energy		Density	Similar MMPA Standard	Temperature Coefficient		Curie Temp. °C	Max. Working Temp.
	Br		Hcb		(BH)max		Density		Temperature Coefficient
	mT	Gs	KA/m	Oe	KJ/ m³	MGOe	g/cm³		%/°C Br	%/°C Hcb
*LN9	680	6800	30	380	9.0	1.13	6.9	AlNiCo 3	-0.03	-0.02	810	450
*LN10	600	6000	40	500	10	1.25	6.9	AlNiCo 3	-0.03	-0.02	810	450
*LNG12	720	7200	45	570	12.4	1.55	7	AlNiCo 2	-0.03	-0.02	810	450
*LNG13	700	7000	48	600	12.8	1.6	7	AlNiCo 2	-0.03	-0.02	810	450
LNG37	1200	12000	48	600	37	4.65	7.3	AlNiCo 5	-0.02	0.02	860	525
LNG40	1250	12500	48	600	40	5.0	7.3
LNG44	1250	12500	52	650	44	5.5	7.3
LNG52	1300	13000	56	700	52	6.5	7.3	AlNiCo 5 DG
LNG60	1350	13500	59	740	60	7.5	7.3	AlNiCo 5-7
LNGT28	1100	11000	58	720	28	3.5	7.3	AlNiCo 6	-0.02	0.03	860	525
LNGT36J	700	7000	140	1750	36	4.5	7.3	AlNiCo 8 HC	-0.025	0.02	860	550
*LNGT18	580	5800	100	1250	18	2.25	7.3	AlNiCo 8	-0.025	0.02	860	550
LNGT32	800	8000	100	1250	32	4.0	7.3	AlNiCo 8	-0.025	0.02	860	550
LNGT38	820	8200	110	1380	38	4.75	7.3
LNGT44	880	8800	120	1500	44	5.5	7.3
LNGT60	900	9000	110	1380	60	7.5	7.3
LNGT72	1050	10500	120	1500	72	9	7.3	AlNiCo 9	-0.025	0.02	860	550
LNGT44J	820	8200	144	1800	44	5.5	7.3	AlNiCo 8 HE	-0.025	0.02	860	550

*=Isotropic Other=Anisotropic

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