AUTON

AlNiCo magnet

AlNiCo magnets are a type of metal alloy, which is derived from Aluminum, Nickel, Cobalt, Iron and a few other elements, such as: Copper, Titanium and Sulfur etc. AlNiCo magnets have excellent temperature stability and good resistance to demagnetization from vibration and shock, their maximum operating temperature is up to 550 ℃ . And these magnets are very hard and brittle. They also have strong corrosion resistance capability, no coating needed for surface protection.

Because of their high flux density and superior temperature stability, AlNiCo magnets have been accepted in the widest range of application, such as: speaker, telephone, mobile, microwave device, electronic meter, water meter, electronic motor, switch, sensors, aviation, spaceflight, etc.

There are two different manufacturing processes for Alnico magnets: Casting process and Sintering process. Both processes lead themselves to complex geometries and configurations.

Cast AlNiCo magnets are manufactured by pouring a molten metal alloy into a mold and then further processing it through various heat-treat cycles. The resulting magnet has a dark gray exterior appearance, and may have a rough surface. Machined surfaces have a shiny appearance similar to steel.

Cast AlNiCo magnets have excellent direction of orientation due to their unique crystalline grain orientation. They are designed to produce high magnetic output in a specified direction.
Cast AlNiCo 5 is the most popularly used among all the cast AlNiCo magnets. It is used widely in rotation machinery, communications, meters and instruments, sensing devices and holding applications. The higher resistance to demagnetization (coercive force) of Alnico 8,Cobalt content to 35%, allows this material to function well for short lengths or for length to diameter ratios of less than 2 to 1.

Typical magnetic properties of Cast AlNiCo

Equivalent MMPA Class	Grade	Br		Hcb		(BH)max		%Change Per ℃		Tc	Tw(Max)	Density
Equivalent MMPA Class	Grade	mT	KGs	KA/m	Oe	KJ/m3	MGOe	Br	Hcj	℃	℃	g/cm3
AlNiC03	LN9	680	6800	37	470	9	1.13	-0.03	-0.02	760	450	6.9
AlNiC03	LN10	600	6000	40	500	10	1.25	-0.03	-0.02	760	450	6.9
AlNiCo2	LNG12	700	7000	45	565	12	1.50	-0.03	-0.02	810	450	7.0
AlNiCo2	LNG13	680	6800	48	600	13	1.60	-0.03	-0.02	810	450	7.0
AlNiCo5	LNG34	1180	11800	48	600	34	4.30	-0.02	0.02	890	525	7.3
	LNG37	1200	12000	48	600	37	4.65	-0.02	0.02	890	525	7.3
	LNG40	1220	12200	48	600	40	5.00	-0.02	0.02	890	525	7.3
	LNG44	1250	12500	52	650	44	5.50	-0.02	0.02	890	525	7.3
AlNiCo5DG	LNG52	1300	13000	55	690	52	6.50	-0.02	0.02	890	525	7.3
AlNiCo5-7	LNG60	1300	13000	58	725	60	7.50	-0.02	0.02	890	525	7.3
AlNiCo6	LNGT28	1050	10500	56	700	28	3.50	-0.02	0.03	860	525	7.3
AlNiCo7	LNGT18	580	5800	90	1130	18	2.20	-0.03	0.02	860	550	7.3
AlNiCo8	LNGT32	800	8000	104	1300	32	4.00	-0.03	0.02	860	550	7.3
	LNGT38	800	8000	110	1380	38	4.75	-0.03	0.02	860	550	7.3
	LNGT40	820	8200	110	1380	40	5.00	-0.03	0.02	860	550	7.3
AlNiCo8HC	LNGT36J	700	7000	140	1750	36	4.50	-0.03	0.02	860	550	7.3
AlNiCo9	LNGT60	900	9000	110	1380	60	7.50	-0.03	0.02	860	550	7.3
AlNiCo9	LNGT72	1050	10500	112	1410	72	9.00	-0.03	0.02	860	550	7.3

Sintered Alnico magnets are manufactured using a powder metallurgy process which uses controlled atmosphere, high temperature sintering to produce near net shape parts. These may range in size from as little as .05g to 150g. Semi automated production enables adjustment of materials, and processing allows either a standard range of magnetic properties or individually tailored alloys to meet customer specifications.

Sintered AlNiCo offer slightly lower magnetic properties but better mechanical characteristics than the cast AlNiCo. Sintered AlNiCo magnets are most suitable in small sizes. The sintering process is well suited to large volume production, and results in parts which are structurally stronger than cast magnets. Relatively close tolerances can be achieved without grinding.

Typical magnetic properties of Sintered AlNiCo

Equivalent MMPA Class	Grade	Br		Hcb		(BH)max		α(Br)	Tc	Tw(Max)	Density
Equivalent MMPA Class	Grade	mT	Gs	KA/m	Oe	KJ/m3	MGOe	%/ ℃	℃	℃	G/cm3
S.Alnico 3	FLN8	550	5500	42	530	9.0	1.13	-0.022	760	450	6.7
S.Alnico 2	FLNG12	700	7000	48	600	12.4	1.55	-0.014	810	450	7.0
S.Alnico 7	FLNGT18	580	5800	90	1130	18.0	2.20	-0.020	850	500	7.2
S.Alnico 5	FLNG34	1100	11000	48	600	34.0	4.25	-0.016	890	500	7.2
S.Alnico 6	FLNGT28	1000	10000	56	700	28.0	3.50	-0.020	850	500	7.2
S.Alnico 8	FLNGT38	800	8000	100	1250	32.0	4.00	-0.020	850	500	7.2
S.Alnico 8	FLNGT42	850	8500	110	1380	38.0	4.75	-0.020	850	500	7.2
S.Alnico 8HC	FLNGT33J	680	6800	140	1750	36.0	4.50	-0.025	850	500	7.2

Contact person: Sean Liu

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Tel: 0086-592-5802700

Fax: 0086-592-5170127

E-mail: jingxin@jingxin-magnet.com

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