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Hard Ferrite magnet

The elements of Ferrite magnets are ferric oxide, barium oxide and strontium oxide, etc. Ferrite magnets have higher coercive force, higher resistance to be demagnetized and higher corrosion resistance than other non-rare earth permanent magnets. The operating temperature range is from -40°C to +250 °C. The biggest advantages of such magnets are their low price.

Ferrite magnets are widely used in motors, speakers, microwave devices, electronics, machines, instruments, meters, toys and crafts, etc.

Physical property of sintered hard ferrite

Parameters	Mark	Unit	Value	Note
Relative Recoil Permeability	μrec	μrec	1.05~1.3
Curie temperature	Tc	°C	460
The coefficient of Br to temperature	αBr	°C-1	-0.20%	0~100°C
The coefficient of Hcj to temperature	αHCJ	°C-1	0.2%~0.5%	0~100°C
Density	D	g/cm3	4.8~5.0
The coefficient of linear expansion	αR	°C-1	7~15 × 10-6
Hardness	HV	HV	480~580

Permanent ferrite magnet industry standard of USA

Grade	Br (mT)	Hcb (KA/m)	Hcj (KA/m)	(BH)max (KJ/m3)	D (g/cm3)
C1	230	148	258	8.36	4.8
C5	380	191	199	27	4.8
C7	370±10	270±8	318±8	26.1±0.8	4.8
C8A	390±10	231±8	235±8	28.7±0.8	4.8
C8B	410±10	231±8	235±8	32.6±0.8	4.9
C9	380±10	279±8	318±8	26.2±0.8	4.8
C10	400±10	267±8	279±8	30.3±0.8	4.9
C11	420±10	223±8	227±8	34.2±0.8	4.9
C12	400±10	290±8	318±8	32.0±0.8	4.9

SJ/T10410-2000 permanent hard ferrite magnet standard

Grade	Br		Hcb		Hcj		(BH)max
Grade	mT	Gs	KA/m	Oe	KA/m	Oe	KJ/m3	MGOe
Y8T	200~235	≥2000	125~160	≥1570	210~280	≥2610	6.5~9.5	≥0.8
Y22H	310~360	≥3100	220~250	≥2770	280~320	≥3520	20.0~24.0	≥2.5
Y25	360~400	≥3600	135~170	≥1700	140~200	≥1760	22.5~28.0	≥2.8
Y26H-1	360~390	≥3600	200~250	≥2512	225~255	≥2830	23.0~28.0	≥2.9
Y26H-2	360~380	≥3600	263~288	≥3300	318~350	≥4000	24.0~28.0	≥3.0
Y27H	350~380	≥3500	225~240	≥2830	235~260	≥2950	25.0~29.0	≥3.1
Y28	370~400	≥3700	175~210	≥2200	180~220	≥2260	26.0~30.0	≥3.3
Y28H-1	380~400	≥3800	240~260	≥3020	250~280	≥3140	27.0~30.0	≥3.4
Y28H-2	360~380	≥3600	271~295	≥3400	382~405	≥4800	26.0~30.0	≥3.3
Y30H-1	380~400	≥3800	230~275	≥2890	235~290	≥2950	27.0~32.5	≥3.4
Y30H-2	395~415	≥3950	275~300	≥3460	310~335	≥3900	27.0~32.0	≥3.4
Y32	400~420	≥4000	160~190	≥2010	165~195	≥2070	30.0~33.5	≥3.8
Y32H-1	400~420	≥ 4000	190~230	≥2390	230~250	≥2890	31.0~35.0	≥3.9
Y32H-2	400~440	≥ 4000	224~240	≥2810	230~250	≥2890	31.0~34.0	≥3.9
Y33	410~430	≥ 4100	220~250	≥2760	225~255	≥2830	31.5~35.0	≥4.0
Y33H	410~430	≥ 4100	250~270	≥3140	250~275	≥3140	31.5~35.0	≥4.0
Y34	420~440	≥ 4200	200~230	≥2510	205~235	≥2580	32.5~36.0	≥4.1
Y35	430~450	≥ 4300	215~239	≥2700	217~241	≥2730	33.1~33.2	≥4.2
Y36	440~450	≥ 4400	247~271	≥3100	250~374	≥3140	35.1~38.3	≥4.4
Y38	440~460	≥ 4400	285~305	≥3580	294~310	≥3690	36.6~40.6	≥4.6
Y40	450~460	≥ 4500	330~354	≥4150	340~360	≥4270	37.6~41.8	≥4.7

The demagnetization curve of SJ/T10410-2000 hard ferrite

SJ285-77 permanent ferrite magnets standard

Grade	Br		Hcb		(BH)max
Grade	T	Gs	KA/m	Oe	KJ/m3	MGOe
Y10T	≥0.20	≥2000	128~160	1600~2000	6.4~9.6	0.8~1.2
Y15	0.28~0.36	2800~3600	128~192	1600~2400	14.3~17.5	1.8~2.2
Y20	0.32~0.38	3200~3800	128~192	1600~2400	18.3~21.5	2.3~2.7
Y25	0.35~0.39	3500~3900	152~208	1900~2600	22.3~25.5	2.8~3.2
Y30	0.38~0.42	3800~4200	160~216	2000~2700	26.3~29.5	3.3~3.7
Y35	0.40~0.44	4000~4400	176~224	2200~2800	30.3~33.4	3.8~4.2
Y15H	≥0.31	≥3100	232~248	2900~3100	≥17.5	≥2.2
Y20H	≥0.34	≥3400	248~264	3100~3300	≥21.5	≥2.7
Y25BH	0.36~0.39	3600~3900	176~216	2200~2700	23.9~27.1	3.0~3.4
Y30BH	0.38~0.40	3800~4000	224~240	2800~3000	27.1~30.3	3.4~3.8

Permanent ferrite magnet standard of TDK

Grade	Composition	Residual Flux		Coercive Force		Intrinsic Coercive Force		Maximum Energy Product
		Br		Hcb		Hcj		(BH)max
		mT	KGs	KA/m	KOe	KA/m	KOe	KJ/m3	MGOe
FB4D	SrO6Fe2O3	410±10	4.1±0.1	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±0.15	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±0.15	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±0.15	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	BaO6Fe2O3	220±15	2.2±0.15	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±10	4.05±0.1	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	4.2±0.1	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	4.0±0.1	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	4.1±0.1	175.1±15.9	2.2±0.2	176.7±15.9	2.22±0.2	31.8±1.6	4.0±0.2
FB6N	SrO6Fe2O3	440±10	4.4±0.1	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	4.2±0.1	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	4.0±0.1	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	3.8±0.1	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	4.4±0.1	226.8±11.9	2.85±0.15	229.2±11.9	2.88±0.15	36.7±1.6	4.6±0.2
FB5B	SrO6Fe2O3	420±10	4.2±0.1	262.6±11.9	3.3±0.15	266.6±11.9	3.35±0.15	33.4±1.6	4.2±0.2

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