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Manufacturing Quality Control

The foundation of Hoosier's success as a supplier of ferrite power is our commitment to controlling our manufacturing process. The powder production is monitored and tightly controlled throughout the entire manufacturing process. We use real time statistical tracking software to ensure up to the minute reporting.

Rigorous quality control standards are maintained from mixing our raw materials to producing finished ferrite powder. Production and maintenance personnel, quality technicians, clerical staff, and plant management personnel are dedicated problem solvers and are well trained in understanding the manufacturing process and the expectations of our customers.

Ceramic Quality Check Procedure

Each lot of ceramic powder is quality checked using the following procedure:

Milling

  • 1.3 L steel jar mill
  • 3.0 KG of 0.317 diameter steel balls
  • 200 grams of ceramic ferrite powder
  • Wet mill additives
  • 325 ml of water
  • 90 RPM mill speed

Allow mill to run for 10 hours to achieve a particle size of 0.7 micron (+/- 0.05 micron) as measured using a Fisher Sub-Sieve Sizer, using a 5.15 gram sample.

Pressing
Concentrate slurry to 70(+5) weight percent solids.

  • Orienting field----------------------9000 Oersted
  • Final Pressing Tonnage--------986 KPa
  • Wet Green Density----------------3.20-3.25g/cm3

Sintering
Sinter to obtain a fired density of 4.95 (+0.05) g/cm3.  Typical cycle of approximately ten hours with a peak temperature of 1240° C (+5° C) as determined by Reidhammer rings.

LOI      15-16%

LEEP Quality Check Procedure

Each lot of LEEP powder is quality checked using the following procedure:

Preparation of Binder (Composition B):

Weight in Grams

Material

Manufacturer

Grade

680

Chlorosufonated Polyethylene

Dupont

Hypalon 45

320

Polyisobutylene

EXXON

Vistanex 140

54

Pentaerythritol Ester of Resin

Hercules

Pentalyn G

22

Lubricant

Acme Hardesty

Stearic Acid 60R

Specific Gravity = 1.02

Compounding of the LEEP Ferrite – Binder Mix:
Our mixing equipment consists if a 6 X 12 inch two-roll rubber mill operating at 25 RPM with a friction ratio of 1:1:1.  The rolls are heated to a temperature of 99° C and the gap between the roll is adjusted to 0.20 mm. 100 grams of binder is added to the mill first, then 900 grams of ferrite powder is introduced to the mill and mixed by standard techniques.  The flexible sheet is finally brought to a thickness of 4.0 mm for magnetic testing by opening the rolls, laminating, and calendaring.

Contact our specialists for powder recommendations or to request a material sample.

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