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Alnico Magnet

Cast Alnico

Sintered Alnico

Bonded Alnico

Isotropy Alnico Alloy

Anisotropy Alnico Alloy

Injection Bonded Alnico

Cast Alnico magnet

Alnico materials (composed predominantly of aluminum,nickel,and cobalt with minor amounts of other elements including titanium and copper) permit design latitudes providing high indications,high energies and relatively high coercivities.Alnico magnets are characterized by excellent temperature stability and good resistance to demagnetization from vibration and shock.Alnico magnets offer the best temperature characteristics of any standard production magnet material available,.They can be used for continuous duty applications where temperature extremes up to 930F can be expected.

Alnico magnetsl are manufactured through either a casting or sintering process. Alnico magnet is very hard and brittle.Machining or drilling can not therefore be accomplished by ordinary methods.Holes are usually cored in at the foundry.Magnets are cast or sintered as closely as possible to required sized so that abrasive grinding to finish dimensions and tolerances is minimized

Specialized casting techniques used to achieve the unique crystalline grain orientation found in the Alnico 5 and 8 grades.These anisotropic grades are designed to produce high magnetic output in a specified direction.Orientation is achieved during heat treatment, by cooling the casting from 2000F at a controlled rate within a magnetic field which conforms to the preferred direction of magnetization. Alnico 5 and Alnico 8 are anisotropic and exhibit a preferred direction of orientation,Magnetic orientation should be specified on your drawing when you send an order to us.

Cast Alnico 5 is the most commonly used of all the cast Alnico's .It combines high indications with a high energy product of 5 MGOe or more and is used extensively 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.

Sintered Alnico materials offer slightly lower magnetic properties but butter mechanical characteristics than the cast Alnico materials.Sintered Alnico magnets are most suitable in small sizes(less than 1 oz.)in this process. The desired mix of metal powder is pressed to shape and size in a die,then sintered at 2300 F in a hydrogen atmosphere.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.

The Characteristics of Alnico Magnet:

1. Small changes in magnetic properties to temperature effects
2. Maximum working temperature can be as high as 450oC~550oC.
3. Low coercive force.
4. Strong corrosion resistance capability,no coating needed for surface protection.

Typical Applications for Alnico magnet:

1. Widely used applications such as instruments and meters which require very stable temperature properties.
2. Electronic ignition systems,watt bour meters,volt-amp meters.medical instruments,industrial motors,magnetic reed switches,generators,hand tools,vending machines.

Typical Magnetic Performance Range for Cast Alnico Magnet

 

Grade	Br		Hc		(BH)max		MMPA Equivalent	Temp. Coefficient	Tc	Tw
	mT	KGs	KA/M	Oe	KJ/m3	MGOe		%/
LN9	690	6.9	37	470	10.0	1.25	Alnico1	-0.03	760	500
LNG12	700	7	40	500	12.0	1.50	Alnico2	-0.03	810	500
*LNG13	680	6.8	48	600	12.0	1.50	Alnico2	-0.03	810	500
*LN10	600	6	40	500	10	1.2	Alnico3	-0.03	760	500
LNGT18	580	5.8	90	1130	18.0	2.20	[l.Alnico7]	-0.03	860	500
LNG16	800	8	53	660	16.0	2.00	[Alnico4]	-0.02	850	500
LNG34	1180	11.8	44	550	35.0	4.30	[Alnico5C]	-0.02	890	500
LNG37	1180	11.8	48	600	37.0	4.65	Alnico 5	-0.02	890	500
LNG40	1220	12.2	48	600	40.0	5.00		-0.02	890	500
LNG44	1220	12.2	52	650	44.0	5.50	Alnico 5 DG	-0.02	890	500
LNG 52	1250	12.5	55	690	52.0	6.50	Alnico 5-7	-0.02	890	550
LNG60	1300	13	56	700	60.0	7.50	Alnico 6	-0.02	890	500
LNGT28	1050	10.50	56	700	28.0	3.50	Alnico 8	-0.02	860	550
LNGT32	800	8	104	1300	34	4.25		-0.03	860	550
LNGT38	820	8.2	110	1380	38.0	4.75		-0.03	860	550
LNGT44	880	8.8	120	1500	44.0	5.50		-0.03	860	550
LNGT60	900	9	110	1380	60	7.5	Alnico 9	-0.03	860	550
LNGT72	1050	10.5	112	1410	72	9		-0.03	860	550
LNGT36J	700	7	140	1750	36	4.5	Alnico 8HC	-0.03	860	550

Demagnetization Curve of Cast Alnico Magnet

Sintered Alnico Permanent Alloy

Isotropy Alnico Bonded Magnet

 

1. Inspection standard for permanent magnet
2. Purchasing Guide
3. Permanent magnet supply direction
4. Surface protection and surface coating for the permanent magnet
5. Quality warranty
6. Safety principle for manual operation of permanent magnet

 

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