Sintered Ferrite Powder Built for Magnets That Outperform & Outlast
If you're still tolerating 5 % reject rates, fuzzy magnetic curves or powder that clogs your wet-press dies, it's time to switch. Dexinmag's DX-series sintered ferrite powder is the same stuff Tier-1 audio brands quietly swapped in last year-and their motor QA reports just dropped by 18 %. Ready to see what "invisible" quality looks like on your floor?
What Exactly Is DX-Series Sintered Ferrite Powder?
Think of it as the ceramic magnet's DNA. We spray-dry ultra-pure SrFe₁₂O₁₉ (or BaFe₁₂O₁₉ if you need the budget route) into free-flowing granules that are:
- 99.4 % chemically uniform (ICP-OES batch sheet ships with every drum)
- Pre-sintered at 1 220 °C so your tunnel kiln only has to hit 1 180 °C-saves 8 % gas
- Coated with 0.3 % organic binder that burns out clean, zero carbon residue
Bottom line: you get a powder that presses at 1.8–2.2 g cm⁻³ green density without cracks, and sinters to ≥4.2 MGOe in 14 h instead of 20.
Quick-Glance Spec Table
| Property (25 °C) | DX-S45 (Sr) | DX-B40 (Ba) | Test Method |
|---|---|---|---|
| Remanence Br | 4.4 kG | 4.0 kG | IEC 60404-5 |
| Intrinsic Coercivity iHc | 3 800 Oe | 3 200 Oe | IEC 60404-5 |
| Max. Energy Product (BH)max | 4.5 MGOe | 3.8 MGOe | IEC 60404-5 |
| Particle Size D₅₀ | 0.9 µm | 1.1 µm | Laser diffraction |
| Moisture Content | ≤0.15 % | ≤0.15 % | 105 °C, 2 h |
| Tap Density | 1.25 g cm⁻³ | 1.20 g cm⁻³ | ASTM B527 |
| Recommended Sinter Temp. | 1 180 °C | 1 150 °C | Dexinmag SOP |
Where This Powder Ends Up
Loudspeaker Rings
- THD dropped 0.8 % on 6.5-inch woofers after a Shenzhen OEM swapped to DX-S45.
Automotive Window Motors
- Passes 1 000-h thermal-cycle @ 150 °C-no flux loss >3 %.
NMR Desktop Scanners
- Field homogeneity ±20 ppm across 10 mm³ voxel (university of Groningen study, 2023).
Refrigerator Compressors
- Start-up torque +5 %, power draw –4 %.
Why Production Managers Keep Reordering
- Zero "orange-peel" defect for 18 months running-our SEM micrographs prove grains <1 µm.
- 7-day lead time for 5 t lots; 24 h for 500 kg express air.
- Every drum laser-coded; scan the QR code and you get the ICP, XRD and particle-size pdf before the pallet even hits your dock.
- Need a custom Br window ±0.1 kG? We tweak the Sr/Ba ratio and re-spray-no MOQ.
FAQ About Sintered Ferrite Powder
Q: How do I know each lot hits the Br number?
A: We measure every 30 kg sub-lot on a KJS Associates hysteresisgraph; certificate ships inside the drum lid.
Q: Can I run this in my existing wet-press line?
A: Yes-same 55 % solids slurry ratio you use now; just drop dispersant to 0.8 % (from 1.0 %).
Q: Is the powder RoHS & REACH?
A: 100 % heavy-metal exempt; we re-register REACH annually, EU 2023 certificate on file.
Q: What if my sintering kiln profile is 30 °C cooler than yours?
A: We'll send a free 2 kg pilot bag; adjust 0.5 h dwell and you'll still hit 4.0 MGOe.
Q: Do you stock in North America?
A: 20 t safety stock in Ontario, CA; next-day UPS Freight for 500 kg+.
Why Choose Xiamen Dexing Magnet
- Experience: 23 years only making ferrite powder-nothing else.
- Expertise: 3 PhDs in magnetic ceramics on staff, 12 patents (US 10,781,092 for ultra-low-loss Sr ferrite).
- Authoritativeness: Sole China powder supplier cited in IEEE Trans. Magn. 2022 speaker-magnet round-robin.
- Trustworthiness: ISO 9001, IATF 16949, and Dun & Bradstreet 5A-1 credit rating; Alibaba Trade Assurance US $2.4 M covered.
Grab a free 1 kg trial bag-ship it to your plant, run it alongside your current powder, and measure the difference. If your reject rate doesn't drop, we'll pick up the freight both ways. Hit the button below, tell us your target Br, and we'll express-ship tomorrow.
[Get My Free Sample] → links to contact form with drop-down: Target Application / Required Br / Monthly Volume