SmCo Magnets made of VACOMAX

Rare-Earth Permanent Magnets for High Temperature Applications. Now also in compliance with DFARS 225.7018, 10 USC. 2533c.

Samarium-Cobalt magnets made of VACOMAX® have particularly high coercivities with simultaneous high saturation polarization and excellent temperature and corrosion stability. 

Benefits:

  • Suitable for high temperature applications (depending on alloy up to max. 350 °C)
  • High corrosion resistance against aggressive media 
  • Usually no coating necessary
  • Low decrease of magnetic properties with increasing temperature due to high Curie temperature
  • Servo motors
  • Automotive applications (e.g. sensors...)
  • High end sport cars
  • Aviation

Magnets out of VACOMAX are produced by sintering using powder metallurgical processes. Depending on form, quantities, dimensions, tolerances and magnetic properties the magnets are produced out of bigger (isostatically) pressed blocks or die-pressed.

The magnetic properties are influenced by the alloy composition and the pressing method. Three different processes are possbile which are reflected in the alloy name with the letters HR, TP or AP. HR (High Remanence) refers to isostatically pressed magnets. In die-pressed design we differentiate between TP (Transverse-Pressed) and AP (Axial-Pressed)

When die-pressing, the powder particles are aligned by strong magnetic fields parallel (axial field for AP-grades) or perpendicular (transverse fields for TP-grades) to the direction of pressing depending on the geometry of the part. Isostatically or transverse-field pressed parts have an about 5 to 8 % higher remanence compared to axial-field pressed magnets. 

  • Servo motors
  • Automotive applications (e.g. sensors...)
  • High end sport cars
  • Aviation

Magnets out of VACOMAX are produced by sintering using powder metallurgical processes. Depending on form, quantities, dimensions, tolerances and magnetic properties the magnets are produced out of bigger (isostatically) pressed blocks or die-pressed.

The magnetic properties are influenced by the alloy composition and the pressing method. Three different processes are possbile which are reflected in the alloy name with the letters HR, TP or AP. HR (High Remanence) refers to isostatically pressed magnets. In die-pressed design we differentiate between TP (Transverse-Pressed) and AP (Axial-Pressed)

When die-pressing, the powder particles are aligned by strong magnetic fields parallel (axial field for AP-grades) or perpendicular (transverse fields for TP-grades) to the direction of pressing depending on the geometry of the part. Isostatically or transverse-field pressed parts have an about 5 to 8 % higher remanence compared to axial-field pressed magnets. 

Our VACOMAX® Alloys made of Samarium-Cobalt

Btyp. [T]:  0.9 - 1.19  T
Br min. [T]:  0.85 - 1.17  T
HcB typ. [kA/m]:  660 - 880  kA/m
HcB min. [kA/m]:  600 - 860  kA/m
HcJ min. [kA/m]:  640 - 1990  kA/m
(BH) typ. [kJH/m3]:  160 - 265  kJ/m³
(BH) min. [kJH/m3]:  140 - 255  kJ/m³
Product Download Br typ.
[T]
Br min.
[T]
HcB typ.
[kA/m]
HcB min.
[kA/m]
HcJ min.
[kA/m]
(BH)max typ.
kJ/m3
(BH)max min.
kJ/m3
TK(Br
RT-100°C)
[%/°C]
TK(HcJ
RT-100°C)
[%/°C]
TK(Br
RT-150°C)
[%/°C]
TK(HcJ
RT-150°C)
[%/°C]
VACOMAX 145 S0.90.856606001990160140-0.04-0.14-0.05-0.15
VACOMAX 225 HR1.11.038207201590225190-0.03-0.18-0.04-0.19
VACOMAX 225 AP1.040.977606801590200170-0.03-0.18-0.04-0.19
VACOMAX 240 HR1.121.05730600640240200-0.03-0.15-0.04-0.16
VACOMAX 170 HR1.010.957907101195200170-0.04-0.21-0.05-0.22
VACOMAX 262 HR1.191.158758441750262243-0.04-0.26-0.04-0.26
VACOMAX 225 TP1.071.037907201590215190-0.03-0.18-0.04-0.19
VACOMAX 262 TP1.171.128657801590254223-0.04-0.26-0.04-0.26
VACOMAX 262 HRP1.191.178808601710265255-0.04-0.26-0.04-0.26
VACOMAX 175 AP *10.957806801960195175-0.05-0.29-0.06-0.28
VACOMAX 190 HR *1.061.018307551195215190-0.05-0.32-0.06-0.31

The values given for VACOMAX 175 AP and VACOMAX 190 HR are only provisional.

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