Permanent ferrite magnets and ceramic magnets introduction

Ferrite Magnets Introduction

01. Ferrite (Ceramic) Magnets Introduction

Ferrite (Ceramic) Magnets are manufactured from oxide materials using powder metallurgical process. Ceramic magnet is most widely used because of its low cost, high-energy, good electric insulation and excellent resistance to demagnetization. The most common type of ceramic magnets are anisotropic strontium, anisotropic barium and isotropic barium magnet.

Ferrite (Ceramic) Magnets are essentially composed of oxide materials with Barium Carbonate or Strontium Carbonate, manufactured under a powder metallurgical process. The feature of low recoil permeability, along with the high coercive force, makes them highly resistant to demagnetizing fields. In addition, their relatively low specific density and economical cost are also very attractive to the magnet designers.

When designing the ferrite magnets for a particular application, primary consideration should be given to its shape limitation due to the powder metallurgical manufacturing process and the temperature dependence of ferrite materials. Ferrite Magnets has good anti-corrosion performance, no surface treatment needed. At present, we have put our emphasis on the application for electric motors, magnetic separators, magnetic resonance imaging and automotive sensors.

Main products includes: hard ferrite arc or segment, ring magnets, rectangular magnets, ferrite power etc. Ferrite magnets have the following advatages: high coercive force, high electric resistance, long-time stability, and economical price. Meanwhile, we can manufacture new tools according to customers`demand.

02. Ferrite (Ceramic) Magnets Production Process

03. Ferrite (Ceramic) Magnets Performance Datasheets

Ferrite (Ceramic) Magnets Chinese Standard (SJ/T10410 2002) – commonly used globally, especially in UK and EU


Grade	Remanence Br			Coercive Force Hcb			Intrinsic Coercivity Hcj			Max. Energy Product (BH)max
Grade		mT	Gs	kA/m	kOe	kA/m	kOe	kJ/m³	MGOe
Y8T	200-235	2,000-2,350	125-160	1.57-2.01	210-280	2.64-3.52	6.5-9.5	0.8-1.2
Y22H	310-360	3,100-3,600	220-250	2.76-3.14	280-320	3.52-4.02	20.0-24.0	2.5-3.0
Y25	360-400	3,600-4,000	135-170	1.70-2.14	140-200	1.76-2.51	22.5-28.0	2.8-3.5
Y26H-1	360-390	3,600-3,900	220-250	2.76-3.14	225-255	2.83-3.20	23.0-28.0	2.9-3.5
Y26H-2	360-380	3,600-3,800	263-288	3.30-3.62	318-350	3.99-4.40	24.0-28.0	30-3.5
Y27H	350-380	3,500-3,800	225-240	2.83-3.01	235-260	2.95-3.27	25.0-29.0	3.1-3.6
Y28	370-400	3,700-4,000	175-210	2.20-2.64	180-220	2.26-2.76	26.0-30.0	3.3-3.8
Y28H-1	380-400	3,800-4,000	240-260	3.01-3.27	250-280	3.14-3.52	27.0-30.0	3.4-3.8
Y28H-2	360-380	3,600-3,800	271-295	3.40-3.71	382-405	4.80-5.09	26.0-30.0	3.3-3.8
Y30H-1	380-400	3,800-4,000	230-275	2.89-3.45	235-290	2.95-3.64	27.0-32.5	3.4-4.1
Y30H-2	395-415	3,950-4,150	275-300	3.45-3.77	310-335	3.89-4.21	27.0-32.0	3.4-4.0
Y32	400-420	4,000-4,200	160-190	2.01-2.39	165-195	2.07-2.45	30.0-33.5	3.8-4.2
Y32H-1	400-420	4,000-4,200	190-230	2.39-2.89	230-250	2.89-3.14	31.5-35.0	4.0-4.4
Y32H-2	400-440	4,000-4,400	224-240	2.81-3.01	230-250	2.89-3.14	31.0-34.0	3.9-4.3
Y33	410-430	4,100-4,300	220~250	2.76-3.14	225-255	2.83-3.20	31.5-35.0	4.0-4.4
Y33H	410-430	4,100-4,300	250-270	3.14-3.39	250-275	3.14-3.45	31.5-35.0	4.0-4.4
Y34	420-440	4,200-4,400	200-230	2.51-2.89	205-235	2.57-2.95	32.5-36.0	4.1-4.5
Y35	430-450	4,300-4,500	215-239	2.70-3.00	217-242	2.73-3.04	33.1-38.2	4.2-4.8
Y36	430-450	4,300-4,500	247-271	3.10-3.40	250-274	3.14-3.44	35.1-38.3	4.4-4.8
Y38	440-460	4,400-4,600	285-305	3.58-3.83	294-310	3.69-3.89	36.6-40.6	4.6-5.1
Y40	440-460	4,400-4,600	330-354	4.14-4.45	340-360	4.27-4.52	37.6-41.8	4.7-5.3

Ferrite (Ceramic) Magnets USA Standard – also used in UK


Grade	Remanence Br			Coercive Force Hcb			Intrinsic Coercivity Hcj			Max. Energy Product (BH)max
Grade		mT	kGs	kA/m	kOe	kA/m	kOe	kJ/m³	MGOe
C1	230	2.30	148	1.86	258	3.50	8.36	1.05
C5	380	3.80	191	2.40	199	2.50	27.00	3.40
C7	340	3.40	258	3.23	318	4.00	21.90	2.75
C8/C8A	385	3.85	235	2.95	242	3.05	27.80	3.50
C8B	420	4.20	232	2.91	236	2.96	32.80	4.12
C9	380	3.80	280	3.52	320	4.01	26.40	3.32
C10	400	4.00	280	3.52	284	3.57	30.40	3.82
C11	430	4.30	200	2.51	204	2.56	34.40	4.32
C12	400	4.00	290	3.65	318	4.00	32.00	4.00

Ferrite (Ceramic) Magnets Japan TDK standard


Grade	Composition	Remanence Br			Coercive Force Hcb			Intrinsic Coercivity Hcj			Max. Energy Product (BH)max
Grade	Composition			mT	kG	kA/m	kOe	kA/m	kOe	KJ/m3	MGOe
FB40	SrO6Fe2O3	410+/-10	4.1+/-10	234.8+/-11.9	2.95+/-0.15	238.7+/-15.9	3.0+/-0.2	31.4+/-1.6	3.95+/-0.2
FB3N	SrO6Fe2O3	395+/-15	3.95+/-15	234.8+/-11.9	2.95+/-0.15	238.7+/-15.9	3.0+/-0.2	28.7+/-2.4	3.6+/-0.3
FB3G	SrO6Fe2O3	375+/-15	3.75+/-15	254.6+/-15.9	3.2+/-0.2	270.6+/-19.9	3.4+/-0.25	25.9+/-2.4	3.25+/-0.3
FB3X	SrO6Fe2O3	375+/-15	3.75+/-15	234.8+/-11.9	2.95+/-0.15	238.7+/-15.9	3.0+/-0.2	25.9+/-2.4	3.25+/-0.3
FB1A	SrO6Fe2O3	220+/-15	2.20+/-15	159.2+/-15.9	2.0+/-0.2	258.6+/-19.9	3.25+/-0.25	8.9+/-1.6	1.1+/-0.2
FB5H	SrO6Fe2O3	405+/-15	4.05+/-15	298.4+/-11.9	3.75+/-0.15	322.3+/-11.9	4.05+/-0.15	31.1+/-1.6	3.9+/-0.2
FB4X	SrO6Fe2O3	420+/-10	4.20+/-10	234.8+/-11.9	2.95+/-0.15	238.7+/-15.9	3.0+/-0.2	33.4+/-1.6	4.2+/-0.2
FB4B	SrO6Fe2O3	400+/-10	4.00+/-10	254.6+/-11.9	3.2+/-0.2	262.6+/-19.9	3.3+/-0.25	30.3+/-1.6	3.8+/-0.2
FB4A	SrO/BaO6Fe2O3	410+/-10	4.10+/-10	175.1+/-15.9	2.2+/-0.2	176.7+/-15.9	2.22+/-0.2	31.8+/-1.6	4.0+/-0.2
FBGN	SrO6Fe2O3	440+/-10	4.40+/-10	258.6+/-11.9	3.25+/-0.15	262.6+/-11.9	3.3+/-0.15	36.7+/-1.6	4.6+/-0.2
FB6B	SrO6Fe2O3	420+/-10	4.20+/-10	302.4+/-11.9	3.8+/-0.15	318.3+/-11.9	4.0+/-0.15	33.4+/-1.6	4.2+/-0.2
FB6H	SrO6Fe2O3	400+/-10	4.00+/-10	302.4+/-11.9	3.8+/-0.15	358.1+/-11.9	4.5+/-0.15	30.3+/-1.6	3.8+/-0.2
FB6E	SrO6Fe2O3	380+/-10	3.80+/-10	290.5+/-11.9	3.65+/-0.15	393.9+/-11.9	4.95+/-0.15	27.5+/-1.6	3.45+/-0.2
FB5N	SrO6Fe2O3	440+/-10	4.40+/-10	256.8+/-11.9	2.85+/-0.15	2259.2+/-11.9	2.88+/-0.15	36.7+/-1.6	4.6+/-0.2
FB5B	SrO6Fe2O3	420+/-10	4.20+/-10	262.6+/-11.9	3.3+/-0.15	266.6+/-11.9	3.35+/-0.15	33.4+/-1.6	4.2+/-0.2

Ferrite (Ceramic) Magnets IEC Standard (IEC 60404-8-1)


Grade	Remanence Br			Coercive Force Hcb(Hc)			Intrinsic Coercivity Hcj(Hci)			Max. Energy Product (BH)max
Grade		mT	kGs	kA/m	kOe	kA/m	kOe	KJ/m³	MGOe
HF8/22	200/220	2.00/2.20	125/140	1.57/1.76	220/230	2.76/2.89	6.5/6.8	0.8/1.1
HF20/19	320/333	3.20/3.33	170/190	2.14/2.39	190/200	2.39/2.51	20.0/21.0	2.5/2.7
HF20/28	310/325	3.10/3.25	220/230	2.76/2.89	280/290	3.52/3.64	20.0/21.0	2.5/2.7
HF22/30	350/365	3.50/3.65	255/265	3.20/3.33	290/300	3.64/3.77	22.0/23.5	2.8/3.0
HF24/16	350/365	3.50/3.65	155/175	1.95/2.20	160/180	2.01/2.26	24.0/25.5	3.0/3.2
HF24/23	350/365	3.50/3.65	220/230	2.76/2.89	230/240	2.89/3.01	24.0/25.5	3.0/3.2
HF24/35	360/370	3.60/3.70	260/270	3.27/3.39	350/360	4.40/4.52	24.0/25.5	3.0/3.2
HF26/16	370/380	3.70/3.80	155/175	1.95/2.20	160/180	2.01/2.26	26.0/27.0	3.2/3.4
HF26/18	370/380	3.70/3.80	175/190	2.20/2.39	180/190	2.26/2.39	26.0/27.0	3.3/3.4
HF26/24	370/380	3.70/3.80	230/240	2.89/3.01	240/250	3.01/3.14	26.0/27.0	3.3/3.4
HF26/26	370/380	3.70/3.80	230/240	2.89/3.01	260/270	3.27/3.39	26.0/27.0	3.3/3.4
HF26/30	385/395	3.85/3.95	260/270	3.27/3.39	300/310	3.77/3.89	26.0/27.0	3.3/3.4
HF28/26	385/395	3.85/3.95	250/265	3.14/3.33	260/275	3.27/3.45	28.0/30.0	3.5/3.8
HF28/28	385/395	3.85/3.95	260/270	3.27/3.39	280/290	3.50/3.60	28.0/30.0	3.5/3.8
HF30/26	395/405	3.95/4.05	250/260	3.14/3.33	260/270	3.27/3.39	30.0/31.5	3.8/3.9
HF32/17	410/420	4.10/4.20	160/180	2.01/2.26	165/175	2.07/2.20	32.0/33.0	4.0/4.1
HF32/22	410/420	4.10/4.20	215/225	2.70/2.83	220/230	2.76/2.89	32.0/33.0	4.0/4.1
HF32/25	410/420	4.10/4.20	240/250	3.01/3.14	250/260	3.14/3.27	32.0/33.0	4.0/4.1

04. SI and CGS Unit Conversion for Magnetism Quantity


Quantity	Symbol	SI Unit	CGS Unit	Unit Conversion
Remanence	Br	T	Gs	1T=10kGs
Coercive Force	Hcb	kA/m	Oe	1kA/m=4πOe≈12.57Oe
Intrinsic Coercivity	Hcj, iHc	kA/m	Oe	1kA/m=4πOe≈12.57Oe
Max. Energy Product	BHmax	kJ/m3	MGOe	1kJ/m3=4π/10²MGOe≈0.126MGOe
Magnetic Flux	Φ	Wb,Vs	Mx	1Wb=1Vs=10⁸Mx
Magnetization Intensity	M	T	Gs	1T=10kGs
Magnetic Field Intensity	H	kA/m	Oe	1kA/m=4πOe≈12.57Oe
Magnetic Induction Intensity	B	T	Gs	1T=10kGs

05. Ferrite (Ceramic) Magnets Magnetization Directions

Ferrite magnets magnetization directions

06. Physical Properties of Ferrite Magnets


Curie Temperature (°C)	450
Maximum Operating Temperature (°C)	250
Hardness (Hv)	480-580
Density (g/cm3)	4.8 - 4.9
Relative Recoil Permeability (μrec)	1.05 - 1.20
Saturation Field Strength, kOe (kA/m)	10 (800)
Temperature Coefficient of Br (%/°C)	-0.2
Temperature Coefficient of iHc (%/°C)	0.3
Tensile Strength (N/mm)	<100
Transverse Rupture Strength (N/mm)	300

07. Ferrite (Ceramic) Magnets Graphs

Ferrite (ceramic) magnet test report (1)

Ferrite (ceramic) magnet test report (2)

Ferrite (ceramic) magnet test report (3)

BH curve – Y30/C5/(HF26/18)

08. Permanent Magnets Comparison

Permanent Magnets	(BH)max (MGOe)	Curie Temperature (°C)	Max. Working Temp. (℃)	Anti-corrosion	Machinability
Sintered NdFeB Magnets	27-52	310-370	80-230	Bad	Normal
AlNiCo Magnets	1.1-11.5	890	500	Good	Fair
SmCo5	14-25	750	250	Good	Normal
Sm2Co17	22-32	800-840	350	Good	Normal
Ferrite Magnets	0.8-5.3	450	250	Good	Normal
Bonded NdFeB Magnets	3-12	350	160	Good	Good

09. Ferrite (ceramic) Magnets Shipping Methods

(TNT, DHL, FedEx, UPS, etc), Air, Sea.

a: If the weight is under 40kgs, we recommend to send it in shielding boxes by Express.

b: If the weight is between 40-100kgs, it can be sent by Express or Air.

c: If the weight is over 100kgs, we recommend to ship them by Sea.

For more details about ferrite (ceramic) magnets, please send message to us or email to sales@sinnyuan.com. We will reply to you as early as possible.

A Dedicated and Specialist Supplier of Permanent Magnets