Cast and sintered AlNiCo magnets introduction

AlNiCo Magnets Introduction

01. AlNiCo Magnets Profile

AlNiCo permanent magnets: a metal alloy composed of aluminum, nickel, cobalt, iron and other trace element composition. AlNiCo permanent magnets have two different production processes: casting and sintering. AlNiCo magnets can be made into different sizes and shapes by casting process. Compared to casting process, Sintered magnets’ size is smaller, but its dimension accuracy is better than the rough casting magnets. Sintered magnets’s magnetic performance is slightly lower than casting magnets, but its processability is better. AlNiCo magnets offer the best temperature characteristics among all the magnet materials. AlNiCo magnets can be used for continuous duty applications where the temperature up to 930°F (500°C). AlNiCo magnets exhibit a high degree of corrosion resistance and are typically employed in the applications unsuitable for coatings or plating surface treatment.

The lower coercive force of AlNiCo makes magnetizing a simple matter in most cases. In order to optimize the performance of AlNiCo magnets, it is advisable to magnetize the magnet after assembly with other circuit components. AlNiCo Magnets are very strong and brittle, requiring appropriate handling and packing to ensure safety and prevent damage.

Typical Applications for AlNiCo magnets:
Widely used in the applications such as instruments and meters which require very stable temperature properties.
Electronic ignition systems, watt bour meters, volt-amp meters, medical instruments, industrial motors, magnetic reed switches, generators, hand tools, vending machines.

02. AlNiCo Magnets Production Process

Sintered and cast AlNiCo magnets production process

03. AlNiCo Magnets Performance Datasheet

Cast AlNiCo Magnets


Grade	Remanence Br			Coercive Force Hcb			Max. Energy Product (BH)max			Curie Temp. Tc.	Max Working Temp. Tw.	Temp. Coefficient of Br T.C.α (Br)	MMPA Equivalent	IEC Equivalent	Germany Standard
Grade		mT	Gs	kA/m	Oe	kJ/m3	MGOe	[°C]	[°C]	[%°C]			MMPA Equivalent	IEC Equivalent	Germany Standard
*LN9	690	6,900	37	470	9.0	1.13	760	500	-0.03	AlNiCo3	AlNiCo9/4	AlNiCo120
*LN10	600	6,000	40	500	10.0	1.25	760	500	-0.03	AlNiCo3	AlNiCo9/4	AlNiCo120
*LNG12	720	7,200	44	550	12.0	1.50	810	500	-0.03	AlNiCo2	AlNiCo12/6	AlNiCo160
*LNG13	700	7,000	48	600	13.0	1.63	810	500	-0.03	AlNiCo2	AlNiCo12/6	AlNiCo160
LNG16	800	8,000	53	660	16.0	2.00	850	500	-0.02	AlNiCo4	/	/
LNG18	1,050	10,500	48	600	30.0	3.75	850	500	-0.02	AlNiCo4	/	/
LNG32	1,180	11,800	44	550	32.0	4.00	890	500	-0.02	AlNiCo5C	/	AlNiCo500
LNG34	1,180	11,800	44	550	34.0	4.25	890	500	-0.02	AlNiCo5C	/	AlNiCo500
LNG37	1,200	12,000	48	600	37.0	4.65	890	500	-0.02	AlNiCo5	AlNiCo37/5	AlNiCo500
LNG40	1,250	12,500	48	600	40.0	5.00	890	500	-0.02				/
LNG44	1,250	12,500	52	650	44.0	5.50	890	500	-0.02				AlNiCo44/5
LNG48	1,250	12,500	52	650	48.0	6.00	890	500	-0.02	AlNiCo5DG	AlNiCo52/6	AlNiCo600GD
LNG52	1,300	13,000	56	700	52.0	6.50	890	500	-0.02	AlNiCo5DG	AlNiCo52/6	AlNiCo600GD
LNG60	1,350	13,500	56	700	60.0	7.50	890	500	-0.02	AlNiCo5～7	/	AlNiCo700
LNGT28	1,050	10,500	56	700	28.0	3.50	860	500	-0.02	AlNiCo6	AlNiCo26/6	AlNiCo400
*LNGT18	580	5,800	90	1,130	18.0	2.20	860	500	-0.03	AlNiCo7	AlNiCo17/9	AlNiCo260
LNGT32	800	8,000	100	1,250	32.0	4.25	860	500	-0.03	AlNiCo8	/	AlNiCo350
LNGT34	800	8,000	104	1,300	34.0	4.25	860	500	-0.03		/	AlNiCo350
LNGT38	820	8,200	110	1,380	38.0	4.75	860	500	-0.03			AlNiCo38/11	AlNiCo450
LNGT44	880	8,800	120	1,500	44.0	5.50	860	500	-0.03			/
LNGT48	900	9,000	120	1,500	48.0	6.00	860	500	-0.03			/
LNGT60	900	9,000	110	1,380	60.0	7.50	860	500	-0.03	AlNiCo9	AlNiCo60/11	/
LNGT72	1,050	1,050	112	1,410	72.0	9.00	860	500	-0.03				/
LNGT82	1,100	11,000	120	1,500	82.0	10.25	860	500	-0.03
LNGT88	1,100	11,000	120	1,500	88.0	11.00	860	500	-0.03
LNGT92	1,120	11,200	120	1,500	92.0	11.50	860	500	-0.03
LNGT36J	700	7,000	140	1,750	36.0	4.50	860	500	-0.03	AlNiCo8HC	AlNiCo36/15	AlNiCo450

Note: “*” prior to the grade means isotropic and otherwise anisotropic.

Sintered AlNiCo Magnets


Grade	Remanence Br			Coercive Force Hcb			Max Energy Product (BH)max			Temp. Coefficient of Br T.C.α (Br)	Temp. Coefficient of Hcj T.C.β(HcJ)	Curie Temp.	Max Working Temp.	MMPA Equivalent	IEC Equivalent
Grade		mT	Gs	kA/m	Oe	kJ/m³	MGOe	%/°C	%/°C	℃	℃			MMPA Equivalent	IEC Equivalent
*FLN8	500	5,000	40	500	9	1.13	-0.02	-0.03	760	450	AlNiCo3	AlNiCo9/3
*FLNG12	700	7,000	48	600	12.4	1.55	-0.02	-0.03	810	450	AlNiCo2	AlNiCo12/6
*FLNGT18	600	6,000	90	1130	18	2.2	-0.02	-0.03	860	450	AlNiCo3	AlNiCo17/9
FLNG34	1,200	12,000	48	600	34	4.25	-0.02	-0.03	890	450	AlNiCo5	AlNiCo37/5
FLNG37	1,250	12,500	48	600	37	4.63	-0.02	-0.03	890	450	AlNiCo5	AlNiCo37/5
FLNGT28	1,050	10,500	60	600	28	3.5	-0.02	-0.03	850	450	AlNiCo6	AlNiCo37/5
FLNGT38	800	8,000	120	1,500	38	4.75	-0.02	-0.03	850	450	AlNiCo8	AlNiCo36/6
FLNGT42	880	8,800	120	1,500	42	5.25	-0.02	-0.03	820	450	AlNiCo8		AlNiCo38/11
FLNGT33J	700	7,000	140	1,750	33	4.13	-0.02	-0.03	850	450	AlNiCo8HC	AlNiCo36/15


Grade

*FLN8
*FLNG12
*FLNGT18
FLNG34
FLNG37
FLNGT28
FLNGT38
FLNGT42
FLNGT33J

Note: “*” prior to the grade means isotropic and otherwise anisotropic.

04. SI and CGS Unit Conversion for Magnetism Quantity


Quantity	Symbol	SI Unit	CGS Unit	Unit Conversion
Remanence	Br	T	Gs	1T=10kGs
Coercive Force	Hcb	kA/m	Oe	1kA/m=4πOe≈12.57Oe
Intrinsic Coercivity	Hcj, iHc	kA/m	Oe	1kA/m=4πOe≈12.57Oe
Max. Energy Product	BHmax	kJ/m3	MGOe	1kJ/m3=4π/10²MGOe≈0.126MGOe
Magnetic Flux	Φ	Wb,Vs	Mx	1Wb=1Vs=10⁸Mx
Magnetization Intensity	M	T	Gs	1T=10kGs
Magnetic Field Intensity	H	kA/m	Oe	1kA/m=4πOe≈12.57Oe
Magnetic Induction Intensity	B	T	Gs	1T=10kGs

05. AlNiCo Magnets Magnetization Directions

06. Physical Properties of Cast Alnico Magnets


Curie Temperature	760-890℃
Max.Operating Temperature	450-550℃
Resistivity	(47-54)×10-6Ω.cm
Vickers Hardness	520-630Hv
Density	6.9-7.3g/cm³
Relative Recoil Permeability	1.7-4.7μrec
Saturation Field Strength	2.7-6.3kOe/215-500kA/m
Temp. Coefficient of Br	-0.025~-0.03%/℃
Temp. Coefficient of Hcj	+0.01~0.03%/℃

07. Permanent Magnets Comparison

Permanent Magnets	(BH)max (MGOe)	Curie Temperature (°C)	Max. Working Temp. (℃)	Anti-corrosion	Machinability
Sintered NdFeB Magnets	27-52	310-370	80-230	Bad	Normal
AlNiCo Magnets	1.1-11.5	890	500	Good	Fair
SmCo5	14-25	750	250	Good	Normal
Sm2Co17	22-32	800-840	350	Good	Normal
Ferrite Magnets	0.8-5.3	450	250	Good	Normal
Bonded NdFeB Magnets	3-12	350	160	Good	Good

08. AlNiCo Magnets Shipping Methods

(TNT, DHL, FedEx, UPS, etc), Air, Sea.

a: If the weight is under 40kgs, we recommend to send it in shielding boxes by Express.

b: If the weight is between 40-100kgs, it can be sent by Express or Air.

c: If the weight is over 100kgs, we recommend to ship them by Sea.

For more details about AlNiCo magnets, please send message to us or email to sales@sinnyuan.com. We will reply to you as early as possible.

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