AlNiCo magnet AlNiCo Magnets

cast AlNiCofor automotive applicationsfor motors

Overview
AlNiCo magnets are permanent magnets based on aluminum (Al), nickel (Ni) and cobalt (Co) alloys. They provide notable temperature stability, significant residual induction (Br) and a range of magnetic energy products ((BH)max). Production routes include sintering and casting: cast AlNiCo enables complex shapes in larger volumes, while sintered AlNiCo suits small-volume components, complex geometries and assemblies.

Sintered AlNiCo Magnets — Key Characteristics

• Compact crystal structure with high magnetic intensity, good chemical stability and notable corrosion resistance.
• Uniform composition yielding stable magnetic performance across batches.
• Very good temperature stability — the temperature coefficient of Br is among the lowest of common permanent magnets.
• Maximum continuous use temperature for many AlNiCo grades can reach approximately 500 ℃.
• Sintering is suitable for small parts, complex shapes and magnet assemblies.

Application areas for Sintered AlNiCo

• Internal magnetic components in voltmeters/ammeters, electronic power/energy measuring instruments, avometers and flow meters.
• Magnetic sensors, polarized relays, temperature and pressure controllers.
• Small actuators and acoustic components such as mobile phone buzzers, hearing aids and mini speakers.
• Automotive components: lighter mechanisms, odometers for cars and motorcycles, permanent motors, adsorption/holding devices.
• Fields requiring high stability, including aerospace and military applications.

Magnetic properties and physical characteristics — Sintered AlNiCo (selected grades)

• Grade ALNiCo4/1: (BH)max 3.2–4.8 KJ/m3; Br 870–890 mT; Hcb 9–11 kA/m; Hcj 10–12 kA/m; density ~6.8 g/cm3; α(Br) ≈ -0.02 %/K; Tc 750 ℃; Remarks: isotropic.
• Grade ALNiCo8/5: (BH)max 8.5–9.5 KJ/m3; Br 530–620 mT; Hcb 45–50 kA/m; Hcj 47–52 kA/m; density ~6.8 g/cm3; α(Br) ≈ -0.02 %/K; Tc 750 ℃.
• Grade ALNiCo10/5: (BH)max 9.5–11 KJ/m3; Br 630–700 mT; Hcb 48–56 kA/m; Hcj 50–58 kA/m; density ~6.8 g/cm3; α(Br) ≈ -0.02 %/K; Tc 780 ℃.
• Grade ALNiCo12/5: (BH)max 11–13 KJ/m3; Br 700–750 mT; Hcb 50–56 kA/m; Hcj 53–58 kA/m; density ~7.0 g/cm3; α(Br) ≈ -0.02 %/K; Tc 800 ℃.
• Grade ALNiCo14/5 and variants (14/6, 14/8): (BH)max typically 13–16 KJ/m3 and up; Br, coercivity and density vary by subtype (typical density ~7.0–7.1 g/cm3); α(Br) near -0.02 to -0.01 %/K; Tc commonly 790–850 ℃ depending on grade.
• Higher-energy sintered grades (examples: ALNiCo18/10, ALNiCo35/5, ALNiCo29/6, ALNiCo32/10, ALNiCo33/11, ALNiCo39/12, ALNiCo44/12, ALNiCo37/15) show progressively higher (BH)max, Br and coercivity; consult the full grade table for numeric ranges.

Cast AlNiCo Magnets — Overview & Applications
Cast AlNiCo alloys exhibit excellent temperature stability and corrosion resistance. They are commonly used in motors, sensors, separators, loudspeakers and holding/adsorption systems, and allow economical production of larger or complex-shaped components.

Magnetic properties — Cast AlNiCo (selected grades)

• Example LN10: Br ≈ 650 mT; Hcb ≈ 42 kA/m; (BH)max ≈ 10 kJ/m3; max continuous temperature ≈ 810 ℃; common designations include Alnico 3 / Alnico 9/3.
• LNG11: Br ≈ 720 mT; Hcb ≈ 37 kA/m; (BH)max ≈ 11.2 kJ/m3; max continuous temperature ≈ 810 ℃; typical designation Alnico 1.
• LNG13: Br ≈ 700 mT; Hcb ≈ 50 kA/m; (BH)max ≈ 13 kJ/m3; max continuous temperature ≈ 810 ℃; designation examples Alnico 2 / Alnico 12/6.
• Higher-performance cast grades (e.g., LNGT18, LNG16, LNG34, LNG37, LNG40, LNG44, LNG52, LNG60, LNGT28, LNGT32, LNGT38, LNGT44, LNGT60, LNGT72, LNGT36J) present varied Br, Hcb and (BH)max values; typical max continuous temperatures range approximately 810–860 ℃ depending on grade.

Package & Product Images

• Product images include finished magnet photos and packaging illustrations showing sample packs for AlNiCo magnets.

Specifications / Technical data

• Material system: Aluminum‑Nickel‑Cobalt (AlNiCo) alloys.
• Manufacturing methods: sintering and casting (casting enables complex large shapes; sintering suits small/complex parts and assemblies).
• Key magnetic features: notable residual induction (Br), a range of energy products ((BH)max) across grades, and very good temperature stability (low α(Br)).
• Typical maximum continuous operating temperature: up to ~500 ℃ for many AlNiCo applications; specific grades list continuous limits (many cast grades up to ~860 ℃).
• Applications: meters and instruments, sensors and relays, acoustic devices (buzzers, speakers), automotive components (odometers, lighter mechanisms), permanent motors, adsorption/holding systems, aerospace and military uses.
• Available in many standardized grades (examples: ALNiCo4/1, 8/5, 10/5, 12/5, 14/5, 18/10, 29/6, 32/10, 33/11, 35/5, 37/15, 39/12, 44/12, etc.) with documented Br, Hcb, Hcj, (BH)max, density, α(Br) and Curie temperature values.