Alnico Magnet

Alnico magnet is composed primarily of alloys of aluminum, nickel, cobalt, copper, iron, and sometimes titanium, which has remarkable resistance against corrosion and high temperature, and is mainly used in certain precision instruments, such as such as meters, motors and sensors.

Q'ty :

There are two kinds of the Alnico magnets due to different manufacturing processes: Cast Alnico and Sintered Alnico. Cast AlNiCo magnet is made by pouring melted AlNiCo into a mold. The solidified material is rough ground and then heat treated and cooled. Most AlNiCo magnets are in shapes of disc, block and ring. Casting process can be used to manufacture magnets with different shapes, the magnetic property of cast magnet is better than sintered AlNiCo magnet.

Compared with cast alnico, the advantages of sintered alnico magnet are smaller size, tighter dimensional tolerances and better machinability, but sintered magnetic properties are slightly lower than cast alnico magnet.

牌號（Grade）	美國標準 (American Standard）	剩磁 Br		矯頑力 Hcb		最大磁能積		密度	可逆溫度係數	可逆溫度係數	居裡溫度TC	最高工作溫度TW	備註
牌號（Grade）	美國標準 (American Standard）	mT	Gs	KA/m	Oe	KJ/m³	MGOe	g/cm³	％ /℃	％ /℃	℃	℃	備註
LN10	ALNICO3	600	6000	40	500	10	1.2	6.9	-0.03	-0.02	810	450	各向同性
LNG13	ALNICO2	700	7000	48	600	12.8	1.6	7.2	-0.03	0.02	810	450
LNGT18	ALNICO8	580	5800	100	1250	18	2.2	7.3	-0.025	0.02	860	550
LNG37	ALNICO5	1200	12000	48	600	44	4.65	7.3	-0.02	0.02	850	525	各向異性
LNG40	ALNICO5	1250	12500	48	600	40	5	7.3	-0.02	0.02	850	525
LNG44	ALNICO5	1250	12500	52	650	37	5.5	7.3	-0.02	0.02	850	525
LNG52	ALNICO5DG	1300	13000	56	700	52	6.5	7.3	-0.02	0.02	850	525
LNG60	ALNICO5-7	1350	13500	59	740	60	7.5	7.3	-0.02	0.02	850	525
LNGT28	ALNICO6	1000	10000	57.6	720	28	3.5	7.3	-0.02	0.03	850	525
LNGT36J	ALNICO8HC	700	7000	140	1750	36	4.5	7.3	-0.025	0.02	860	550
LNGT38	ALNICO8	800	8000	110	1380	38	4.75	7.3	-0.025	0.02	860	550
LNGT40	ALNICO8	820	8200	110	1380	40	5	7.3	-0.025	0.02	860	550
LNGT60	ALNICO9	950	9500	110	1380	60	7.5	7.3	-0.025	0.02	860	550
LNGT72	ALNICO9	1050	10500	112	1400	72	9	7.3	-0.025	0.02	860	550

鑄造鋁鎳鈷性能

牌號（Grade）	美國標準 (American Standard）	剩磁 Br		矯頑力 Hcb		最大磁能積		密度	可逆溫度係數	居裡溫度TC	最高工作溫度TW	備註
牌號（Grade）	美國標準 (American Standard）	mT	Gs	KA/m	Oe	KJ/m³	MGOe	g/cm³	％ /℃	℃	℃	備註
SLN8	ALNICO3	520	5200	43	540	8—10	1.0—1.25	6.8	-0.02	760	450	各向同性
SLNG12	ALNICO2	700	7000	43	540	12—14	1.5—1.75	7	-0.014	810	450
SLNGT18	ALNICO8	600	6000	107	1350	18—22	2.25—2.75	7.2	-0.02	850	550
SLNGT28	ALNICO6	1000	10000	57	710	28—30	3.5—3.8	7.2	-0.02	850	525	各向異性
SLNG34	ALNICO5	1100	11000	51	640	34—38	3.5—4.15	7.2	-0.016	890	525
SLNGT31	ALNICO8	780	7800	106	1130	33—36	3.9—4.5	7.2	-0.02	850	550
SLNGT38	ALNICO8	800	8000	126	1580	38—42	4.75—5.3	7.2	-0.02	850	550
SLNGT42	ALNICO8	880	8800	122	1530	42—48	5.3—6.0	7.25	-0.02	850	550
SLNGT38J	ALNICO8HC	730	7300	163	2050	38—40	4.75—5.0	7.2	-0.02	850	550

Features of Alnico magnet：

High residual induction
Excellent temperature stability, up to 550℃
Good corrosion resistance
Wide range of complex shapes and sizes available
Ease of magnetization
High field strengths at medium prices
Lower initial tooling cost

The coercivity values, the high remanence and thermal stability of Alnico make it the most cost effective material for certain applications：

Micro Motors
Seismo-Sensors
Hysteresis Brakes
Electronic devices
Instrument Making
Meters: odometer, electrical meter, water-meter, etc.
Audio and Speakers
Precise Instruments for Aerospace and defense Technologies