Alnico

Temperature resistant magnets
for a wide variety of applications.

Durable. Working temperatures up to 550° C.

Alnico

PROCESS FLOW DIAGRAM
Cast Alnico
RAW MATERIAL
Goods Inwards Inspection
ALLOY MIXING
MELT ALLOYS
POUR-SHAKE-SNAG-GRIND
SOLUTION TREATMENT
Homegenization
FILED
ALIGNMENT
TEMPERING
GRINDING
INSPECTION
ASSEMBLY
MAGNETIZING
packing and despatch

EAM Alnico Magnets

Alnico magnets extremely resistant to elevated temperatures, and have relatively high energy products. They are made primarily from alloys of Aluminum, Nickel, and Cobalt, and may be either cast or sintered. Cast Alnico can be made into intricate shapes that may not be possible with other materials.

Sintered Alnico magnets, while slightly weaker than cast material, exhibit superior mechanical characteristics.

Sintered Alnico magnets are manufactured using a powder metallurgy process which uses controlled atmosphere, high temperature sintering to produce near net shape parts. 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.

Alnico magnets have recently been replaced with sintered neodymium or injection molded magnets in many applications.

Properties

ALNICO Magnetic Material Characteristics

Sintered Alnico Magnets

Download this data in PDF format: EAM-Sintered-Alnico-Properties.pdf – 66kb

Material & Grade Max. Energy Product Remanence Coercive Force Rev. Temp. Coefficient Curie Temp. Density
(BH) max Br Hc Hci % / °C Tc D
MGOe kJ/m3 kG mT Oe kA/m Oe kA/m % / °K °C g/cm3
Alnico 2 1.5 12.0 7.1 710 550 44 570 45 -0.014 810 7.0
Alnico 5 3.9 31.2 10.5 1050 590 47 600 48 -0.016 810 6.9
Alnico 6 3.0 23.8 10.0 1000 700 56 710 57 -0.020 860 7.3
Alnico 8 4.0 32.0 8.0 800 1550 123 1600 128 -0.020 860 7.3
Alnico 8HC 4.5 36.0 6.5 650 1700 136 1880 150 -0.020 860 7.3

Cast Alnico Magnets

Download this data in PDF format: EAM-Cast-Alnico-Material-Properties.pdf – 67kb

Material & Grade Max. Energy Product Remanence Coercive Force Rev. Temp. Coefficient Curie Temp. Working Temp. Density
(BH) max Br Hc Hci Br Hci Tc Tw D
MGOe kJ/m3 kG mT Oe kA/m Oe kA/m % / °C °C g/cm3
Alnico 2 1.6 12.8 7.0 700 580 47 600 48 -0.03 -0.02 810 450 7.0
Alnico 3 1.2 10.0 6.0 600 480 38 500 40 -0.03 -0.02 810 450 6.9
Alnico 5 5.0 40.0 12.5 1250 640 51 640 51 -0.02 -0.02 860 525 7.3
Alnico 5DG 6.5 52.0 13.0 1300 680 55 700 56 -0.02 -0.02 860 525 7.3
Alnico 5-7 7.5 60.0 13.5 1350 740 59 740 59 -0.02 -0.02 860 525 7.3
Alnico 6 3.5 28.0 10.0 1000 720 58 720 58 -0.02 -0.02 860 525 7.3
Alnico 8 5.0 40.0 8.0 800 1480 119 1500 120 -0.025 -0.02 860 550 7.3
Alnico 8B 5.5 44.0 8.5 850 1550 124 1550 124 -0.025 -0.02 860 550 7.3
Alnico 8HE 6.0 48.0 9.0 900 1500 120 1500 120 -0.025 -0.02 860 550 7.3
Alnico 8HC 4.5 36.0 7.0 700 1880 151 1900 152 -0.025 -0.02 860 550 7.3
Alnico 9 9.0 72.0 10.5 1050 1400 112 1400 112 -0.025 -0.02 860 550 7.3

Charts & Data

Sintered Neodymium Demagnetization Curves See data for several grades of neodymium below.

See data for several grades of neodymium below.

CAST ALNICO - 2 & 3 DEMAGNETIZATION CURVES

One

CAST ALNICO - 5 & 6 DEMAGNETIZATION CURVES

One

CAST ALNICO - 8 & 9 DEMAGNETIZATION CURVES

One

SINTERED ALNICO-8 DEMAGNETIZATION CURVE

One

SINTERED ALNICO-2, 5 & 6 DEMAGNETIZATION CURVES

One
One
One
One
One
One

CAST ALNICO DEMAGNETIZATION CURVES

SINTERED ALNICO DEMAGNETIZATION CURVES

Photos

Typical Alnico Magnet Products

Alnico magnets exhibit high residual inductions, are extremely resistant to elevated temperatures, and have relatively high energy products. They are made primarily from alloys of Aluminum, Nickel, and Cobalt, and may be either cast or sintered. Cast Alnico can be made into intricate shapes that may not be possible with other materials.

Sintered Alnico magnets, while slightly weaker than cast material, exhibit superior mechanical characteristics.

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.

Case Studies

Magnetically Actuated Emergency Alert System Read more

Anesthesia Equipment Needed a Better Magnetic Valve... Read more

Postage Machine Manufacturer / Advanced Injection Molding Read more

Magnetic Stirrer For Laboratory Equipment Manufacturer Read more

Controller For High-Tech Manufacturer Read more

Power Tool Manufacturer Read more

Tier 1 Commercial Automotive Supplier Read more

Critical Pump Mechanism for Heart & Lung Machine Read more

After-Market Magnetic 'Break-Away' Oil Filter Read more

A Magnetic Stirrer for the Food Industry Read more

Processing

PROCESS FLOW DIAGRAM
Goods Inwards Inpection
Pressing
De-Waxing
Sintering
Solution Treatment(Homegenization)
Filed Alignment
TEMPERING
GRINDING
INSPECTION
ASSEMBLY
MAGNETIZING
Packing & Despatch

PROCESSING SINTERED ALNICO

Processing begins with the controlled blending of fine metal powders consisting primarily of aluminum, nickel, cobalt and iron.

A wax lubricant is added at this stage to aid the subsequent pressing process.

The mixed powder is then compacted to form the required shape using varied press technology. Close dimensional control is maintained by statistical process control (SPC), both at this stage and after sintering.

De-waxing through a low temperature furnace removes the pressing lubricant prior to sintering.

Sintering is undertaken at high temperature under a protective atmosphere of hydrogen. An homogeneous fully dense alloy results.

Further heat treatment is required for most alloys to introduce improved magnetic properties. Anisotropic properties can be induced by additional specialized heat treatment. For those materials that have been heat treated, the final part of the process is multi-stage tempering which reduces brittleness but more importantly, further enhances the magnetic performance and stabilizes the material.

To achieve very high dimensional control specific surfaces can be machined to very close tolerances using high volume grinding machines.

Final inspection before dispatch or subsequent assembly, ensures that all parts conform both physically and magnetically to specification.

Browse Standard Parts

Alnico Magnets Standard Parts:

Need a stock magnet for prototyping, design work, crafts or home projects?

We’ve made it easy to browse EAM’s standard parts and make purchases easily with a credit card. All orders ship direct from our NY or PA locations.

Just click to be redirected to EAM’s online magnet store:

Download this data in 3-page PDF :EAM-Standard-Alnico-Magnets.pdf-187kb

Alnico-5 Rods

EAM Part No.Outer Diameter (A)Length (B)MGOeGradeMax Operating Temp. (C)FinishMachineable?Impact Resistance
CA-03550.0620.50055550°CGroundNoModerateBuy
CA-02750.0800.50055550°CGroundNoModerateQuote
CA-02740.1000.50055550°CGroundNoModerateQuote
CA-01600.1250.50055550°CGroundNoModerateBuy
CA-00440.1251.00055550°CGroundNoModerateQuote
CA-03710.1251.72555550°CGroundNoModerateBuy
CA-01740.1570.78755550°CGroundNoModerateBuy
CA-01560.1871.00055550°CGroundNoModerateQuote
CA-04220.1871.62555550°CGroundNoModerateBuy
CA-03760.1900.62555550°CGroundNoModerateQuote
CA-03440.2360.98455550°CGroundNoModerateBuy
CA-01590.2501.00055550°CGroundNoModerateBuy
CA-02180.2501.25055550°CGroundNoModerateBuy
CA-02160.2503.25055550°CGroundNoModerateBuy
CA-01820.3121.00055550°CGroundNoModerateQuote
CA-02080.3121.50055550°CGroundNoModerateQuote
CA-02940.3751.25055550°CGroundNoModerateQuote
CA-01650.3754.00055550°CGroundNoModerateQuote
CA-03480.5002.00055550°CGroundNoModerateQuote
CA-00510.7505.75055550°CGroundNoModerateBuy

Alnico-8 Rods

EAM Part No.Outer Diameter (A)Length (B)MGOeGradeMax Operating Temp. (C)FinishMachineable?Impact Resistance
SM-00660.1250.2505.58550°CGroundNoModerateQuote
SM-98310.1250.5005.58550°CGroundNoModerateQuote
CA-02170.1570.7875.58550°CGroundNoModerateQuote
SM-01100.2500.2505.58550°CGroundNoModerateQuote
CA-03730.2500.5005.58550°CGroundNoModerateQuote

Alnico-5 Rectangular Magnets

EAM Part No.Length (A)Width (B)Thickness (C)MGOeGradeMax Operating Temp. (C)FinishMachineable?Impact Resistance
SM-01000.5000.0620.06255550°CGroundGroundModerateBuy
SM-01040.7500.1250.12555550°CGroundGroundModerateBuy
SM-01091.0000.1870.18755550°CGroundGroundModerateBuy
CA-00360.8000.2500.25055550°CGroundGroundModerateBuy
SM-01031.0000.2500.25055550°CGroundGroundModerateBuy