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Custom Cast AlNiCo Magnet

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Cast AlNiCo Magnet Manufacturer

Cast AlNiCo magnets are produced by common casting process. AlNiCo 5 is one of the commonly used grades. Molten alnico alloys with different chemical compositions are melted through an induction furnace and poured into a resin bonded sand mold, then the solidified material with a rough surface will undergo a heat treatment and cooling process. Cast AlNiCo magnets offer slightly higher magnetic performance compared to sintered AlNiCo magnets. Cast AlNiCo magnets can be divided into isotropic and anisotropic according to whether an orientation magnetic field is applied during cooling. Most cast AlNiCo magnets are anisotropic magnets for fully enhanced magnetic properties. Therefore, after the heat treatment process, Alnico billets are machined to precise geometries and tolerances.

Cast AlNiCo Magnet
Performance grades of sintered AlNiCo magnets

Grades

Equivalent MMPA Class

Remanence

Coercive Force

Coercive Force

Maximum Energy Product

   Density  

Reversible Temp

  Curie Temp  

Temp Coefficie

Remark

Br

Hcj

Hcb

（BH)max

g/㎤

α（Br）

TC

TW

mT

Gs

KA/m

Oe

KA/m

Oe

KJ/m³

MGOe

%/℃

℃

℃

SLN8

Alnico3

520

5200

43

540

40

500

8-10

1.0-1.25

6.8

-0.02

730

450

Isotropic

SLNG12

Alnico2

700

7000

43

540

40

500

12-14

1.5-1.75

7

-0.014

810

450

SLNGT18

Alnico8

600

6000

107

1350

95

1200

18-22

2.25-2.75

7.2

-0.02

850

550

SLNGT28

Alnico6

1000

10000

57

710

56

700

28-30

3.5-3.8

7.2

-0.02

850

525

Anisotropy

SLNG34

Alnico5

1100

11000

51

640

50

630

14-38

3.5-4.15

7.2

-0.016

890

525

SLNGT31

Alnico8

780

7800

106

1130

104

1300

3-36

3.9-4.5

7.2

-0.02

850

550

SLNGT38

800

8000

126

1580

123

1550

38-42

4.75-5.3

7.2

-0.02

850

550

SLNGT42

880

8800

122

1530

120

1500

42-48

5.3-6.0

7.25

-0.02

850

550

SLNGT38J

Alnico11

730

7300

151

2050

151

1900

38-40

4.75-5.0

7.2

-0.02

850

550

Manufacturing Process of Sintered AlNiCo Magnet
About Our Company

Magnetic material core technology research and development team

Hangzhou Zhiyu Magnetic Technology Co., Ltd. is China Cast AlNiCo Magnet manufacturers and Cast AlNiCo Magnet factory. Hangzhou Zhiyu Magnetic Technology Co., Ltd. is located in Tonglu County, Hangzhou City. It mainly focuses on the research and production of samarium cobalt permanent magnetic materials and magnetic components, and also sells magnetic steel and magnetic components such as neodymium iron boron and aluminum nickel cobalt.
The products are widely used in industries such as national defense and military, aerospace, permanent magnet (high-speed) motors, hydrogen energy compressors, automotive electronics, 5G communication, petrochemical, instrumentation, etc. The variety of samarium cobalt products is complete, with an annual production capacity of over 200 tons;
Fully covering the entire series of samarium cobalt grades of 1:5 and 2:17, covering the entire series of Br0.5T-1.2T;
Stable production of high-performance samarium cobalt magnetic steel with Br ≥ 1.16T and Hcj≥25KOe;
Stable production of Br≥0.96T low-temperature coefficient series products, with residual magnetic temperature coefficient a<-0.01%;
Stable production of ultra-high temperature (temperature resistance ≥ 550 ℃) and high Br (Br ≥ 1.02T) samarium cobalt magnetic steel;
Provide one-stop services from design to product application.

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What is the manufacturing process for cast AlNiCo magnets?
The manufacturing process for cast AlNiCo (Aluminum-Nickel-Cobalt) magnets involves several steps. Here is a general overview of the process:
Raw Material Preparation: The primary raw materials for cast AlNiCo magnets are aluminum, nickel, cobalt, and other minor elements such as copper, iron, and titanium. The materials are carefully selected and weighed according to the desired composition of the magnet.
Melting and Alloying: The raw materials are melted in a furnace at high temperatures. The molten metal is then subjected to alloying, where precise amounts of each element are added to achieve the desired composition. This alloying process ensures the homogeneity of the magnet material.
Casting: The molten alloy is poured into a mold or die that is designed to create the desired shape of the magnet. The mold can be made from various materials, such as steel or graphite, that can withstand the high temperatures and pressures involved in the casting process.
Cooling and Solidification: After the molten alloy is poured into the mold, it is allowed to cool and solidify. Cooling rates and controlled solidification techniques are employed to optimize the magnetic properties of the cast magnet.
Heat Treatment: The cast magnet is subjected to a heat treatment process known as annealing. This process involves heating the magnet to a specific temperature and holding it for a defined period. Annealing helps to enhance the magnet's magnetic properties, such as coercivity and remanence.
Machining and Finishing: Once the cast magnet has cooled and undergone heat treatment, it is machined to achieve the final desired dimensions and surface finish. Machining may involve processes such as grinding, milling, drilling, and lapping to achieve the required shape and tolerances.
Surface Treatment: To improve the magnet's corrosion resistance, the cast AlNiCo magnet may undergo surface treatments such as nickel plating or epoxy coating. These treatments provide a protective layer that helps prevent corrosion and enhance the magnet's durability.
Inspection and Quality Control: The cast AlNiCo magnets undergo a series of inspections and quality control measures to ensure they meet the required specifications and standards. This may involve dimensional checks, magnetic property testing, and visual inspection.
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