AlNiCo - Magnets

This material was developed in the early 30's of the twentieth century. The most outstanding characteristics of this material are its high application temperature of approx. 500°C and the very low temperature coefficient of 0,02%/°K. Because of their high hardness AlNiCo magnets can be worked on later only by grinding and by eroding.
If you are using the magnet as a single magnet without iron support its length-diameter ratio should be 3 - 7. Because of the advantages mentioned this material is used preferentially in adhesive systems for high application temperatures, signal generators for Hall/Reed Sensors and in measuring instruments.

rings

from ø 15 mm to ø 135

cylinders

from ø 1,7 mm to ø 53 mm

blocks

from 1,5 mm to 240 mm

special designs

according to your requirements

Simply ask for your desired magnet. More than 100 different types and dimensions of AlNiCo magnets are available from stock. We are able to manufacture any additional dimension you might require.

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Physical and chemical characteristics

Chemical composition [Gew.-%] : 8AL; 14Ni; 24Co; 3,5Cu; RestFe
Density : 7,3 g/cm³
Curie-temperature : 860 °C
max. usage temperature : 450 °C
Expansion coefficient : 11,3 x 10-6/°C
specific electric resistance: 0,5 μ Ohm m
Vickers hardness : HV 10 ca. 500 - 600
Compressive strength : 1200 - 2200 N/mm²

In its chemical resistance the material is similar to highly alloyed steel, but inconsistant in inorganic acids, in sea water or in strongly alkaline solutions. The material is not attacked by organic solvents, alcohols, oils and gasoline. The material is nontoxic and does not pollute the environment. People who are sensitive to nickel can react with the same side effects as other Ni-containing materials. A direct contact with food and the use in the toy industry should be avoided. If necessary the magnets can be coated with plastic or food-suited color. The magnets are very hard and brittle, the edges break easily and they can only be worked on by abrasive procedures (grinding).

Technical Details

Material		Remanence Br [mT]		HCB kA/m		HCj [kA/m]		Bhmax [KJ/m3]		working - temp. [°C]	Curie- temp. °C	Density
		min	max	min	max	min	max	min	max	max	max	g/cm3
Alnico 120	Alnico 1	450	495	56	61	57	63	8	8	500	760	7,3
Alnico 160	Alnico 2	600	660	40	44	41	45	10	11	500	760	7,3
		720	792	52	57	53	59	15	17	500	810	7,3
Alnico 500 (Guss)	Alnico 5C	1200	1320	44	48	45	50	33	36	520		7,3
Alnico 600	Alnico 5DG	1200	1320	48	53	49	54	36	40	550	890	7,3
Alnico 500 (Sinter)	Alnico 5	1100	1210	53	59	55	60	34	37	550	890	7,3
Alnico 700	Alnico 5-7	1220	1342	48	53	49	54	38	42	550	890	7,3
Alnico 400	Alnico 6	1250	1375	56	61	57	63	47	52	550	890	7,3
Alnico 450 (Guss)	Alnico 8	900	990	57	63	59	65	28	31	520	890	7,3
Alnico 450 (Sinter)	Alnico 8	800	880	110	121	111	122	37	41	520	850	7,3
		880	968	110	121	111	122	47	52	520	850	7,3
	Alnico 9	900	990	110	121	111	122	56	61	520
		700	770	135	149	137	150	34	37	520	850	7,3