Hard Ferrite Magnets

Sintered ferrite magnets encompass two primary variants: Barium Ferrite and Strontium Ferrite, each featuring different orientations, classified as isotropic and anisotropic. These magnets are crafted through a high-temperature sintering process, akin to the production of ceramics. They exhibit a hard and brittle texture, characteristic of their composition.

Over the course of more than five decades, sintered ferrite magnets have undergone significant development to become the most prolifically manufactured permanent magnets globally. Their widespread use spans across numerous industries, including electric motors, magnetic separators, loudspeakers, hearing aids, office supplies, educational tools, and children’s toys.

The appeal of sintered ferrite magnets lies in their attractive balance between cost-effectiveness and moderate magnetic performance. This unique combination positions them as versatile and reliable components in various applications, delivering a cost-efficient magnetic solution while satisfying the demands of specific engineering requirements.

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Magnetic Properties

Grade	Br		Hcb		Hcj		(BH)max		Tw	Equivalent
Grade	mT	KG	KA/m	KOe	KA/m	KOe	KJ/m³	MGOe	°C	Equivalent
Y10T	200~235	2.0~2.35	125~160	1.57~2.01	210~280	2.64~.52	6.5~9.5	0.8~1.2	≤250	IEC~7/21
Y20	320~380	3.2~3.8	135~190	1.70~2.38	140~195	1.76~2.45	18.0~22.0	2.3~2.8	≤250
Y22H	310~360	3.1~3.6	220~250	2.77~3.14	280~320	3.52~4.02	20.0~24.0	2.5~3.0	≤250	IEC~20/28
Y23	320~370	3.2~3.0	170~190	2.14~2.38	190~230	2.39~2.89	20.0~25.5	2.5~3.2	≤250	IEC~20/19
Y25	360~400	3.6~4.0	135~170	1.70~2.14	140~200	1.76~2.51	22.5~28.0	2.8~3.5	≤250	JIS~MPB320
Y26H	360~390	3.6~3.9	220~250	2.77~3.14	225~255	2.83~3.21	23.0~28.0	2.9~3.5	≤250	TDK~FB3X
Y27H	370~400	3.7~4.0	205~250	2.58~3.14	210~255	2.64~3.21	25.0~29.0	3.1~3.7	≤250	IEC~25/22
Y30	370~400	3.7~4.0	175~210	2.2~2.64	180~220	2.64~2.77	26.0~30.0	3.3~3.8	≤250	IEC~26/18
Y30BH	380~390	3.8~3.9	223~235	2.80~2.95	231~245	2.90~3.08	27.0~30.0	3.4~3.7	≤250
Y30H-1	380~400	3.8~4.0	230~275	2.89~3.46	235~290	2.95~3.65	27.0~32.5	3.4~4.1	≤250	TDK~FB4B
Y30H-2	395~415	3.95~4.15	275~300	3.46~3.77	310~335	3.90~4.21	28.5~32.5	3.5~4.0	≤250	TDK~FB5H
Y32	400~420	4.0~4.2	160~190	2.01~2.38	165~195	2.07~2.45	30.0~33.5	3.8~4.2	≤250	TDK~FB4A
Y33	410~430	4.1~4.3	220~250	2.77~3.14	225~255	2.83~3.21	31.5~35.0	4.0~4.4	≤250	TDK~FB4X
Y35	400~410	4.00~4.10	175~195	2.20~2.45	180~200	2.26~2.51	30.0~32.0	3.8~4.0	≤250

Physical Properties

Hard ferrite magnets are composed of iron and barium or strontium oxides. They conduct magnetic flux well and have a high magnetic permeability. This enables these so-called ceramic magnets to store stronger magnetic fields than iron itself. Hard Ferrite magnets are inherently brittle, and it is highly recommended that they not be utilized as structural elements in any application. Their thermal stability is the poorest of all the magnetic families, but they may be utilized in environments up to 300°C.

Br Temperature Coefficient	-0.2%/℃	Density	4.5~5.1g/cm³	Curie Temperature	450~460℃
Coercivity Temperature Coefficient	0.2~0.5%/℃	Vickers-Hardness	480~580HV	Electrical Resistivity	10^-5Ω·cm
Bending Strength	0.05~0.09 kN/m²	Compress Strength	1.3 kN/m²	Tensile Strength	0.02~0.05 kN/m²
Thermal Expansion Coefficient	11~13x10^-6/k	Young's Modulus	170 kN/m²	Thermal Conduct Rate	12 W/mK
Max. Working Temp.	350℃