Ferrite Ferrites
Industrial ceramics plays a great role in our technology today, it covers all products that are made from inorganic, non metallic materials and having industrial or technical applications. The materials normally consist of substance with high melting or softening point. The term “industrial ceramics” also refers to the science and technology of developing and manufacturing such products. The industrial ceramics are a large group of materials having specialized uses other than domestic or aesthetic. They generally exclude glasses, enamels, building materials and certain cements and refractories. The fundamentals of industrial ceramics derive from its name ceramics, which is a term applied to all useful or ornamental clay objects that are baked.
The use of ceramics in industrial technology starts in the early 19th century, by developing a strong porcelains for high voltage electrical insulations. Steatites and cordierites, also with special electrical and mechanilcal properties where produces in the 20th century. This products where obtained largerly by blending and then heating to high temperatures materials, such as various clays, of variables or uncertain purity. Wide range of new material with specified properties for use in industrial ceramics had an increasing demands in the 1930’s.
Primary Components Of Industrial Ceramics
Compound
Chemical formula
Melting Point (°C.)
Oxides
Aluminum oxide
AlO
2054
Barium oxide
BaO
1917
Iron oxide
FeO
1565
Lead oxide
PbO
886
Magnesium oxide
MgO
2800
Silicon oxide
SiO
1726
Titanium dioxide
TiO
1800
Zirconium dioxide
ZrO
2680
Non-oxides
Boron carbide
BC
2450*
Silicon carbide
SiC
2650*
Tungsten carbide
WC
2600
Aluminum nitride
AlN
2235*
Boron nitride
BN
3000*
Silicon nitride
SiN
1900*
Molybdenum disilicide
MoSi
2030
*Decomposition Temperature
Industrial ceramics has different properties that determine the range and extent of their uses.
Chemical properties. Most industrial ceramics are consist of metals and semimetals with non metals and the common primary components are oxides. A few nitrides, carbides, borides, and compounds containing more than one non metal. Other material that may be regarded as ceramics are the elements silicon and carbon in the form of diamonds and graphite. In general, ceramics are more resistant to oxidation and corrosion than plastic and metals.
Mechanical properties. Most industrial ceramics are strong, that is, they show considerable strength and stiffness under compression and bending. “Bend Strength” is commonly used as a criterion of merit and in design calculation. The highest strength polycrystalline ceramic material are based on zirconium dioxide.
Physical properties. Industrial ceramics are compound of light non metals (oxygen, carbon, or nitrogen) with a lighter metals or semi metals. In general, ceramics have low densities compared with metals. And given the part size the strength-to-weight can be higher than for a metal. Many ceramics are also very hard, and resist wear and abrasion. The hardest material known is diamond, followed by boron nitride in cubic crystal form.
Thermal properties. Industrial ceramics has a very high melting or softening points. They retain strength and resistance to deformation under load (”creep” resistance) at temperatures higher than those to which many metal can be exposed. However, these brittle material is weak to “thermal shock”, it is a term for the generation of mechanical stress as a result of a sudden and severe change in temperature than can lead to failure.
Electrical properties. Ceramics exhibit a wide range of electrical conductivities. For example, aluminum oxide is a very good insulator, silicon carbide is a semiconductor at room temperature, and compounds such as chromium dioxide conduct electricity as a metal do. The presence of mobile ions in an oxide or silicate may give rise to ionic conductivity, which increases in high temperature. This is said to be the reason why porcelains cannot be use as a insulators at a high temperatures. On the other hand the mobility of ions in certain types of oxide allows materials such as alumina to be use as electrolytes in energy storage device like battery.
Magnetic properties. Ferrites or ceramics containing iron oxide, FeO-can have magnetic properties similar to those of magnetic containing iron, nickel and cobalt. Unlike metals, ferrite can be made with high electrical resistance and can be used at high frequencies without an acceptable loss of power. They can be also made with a high resistance to demagnetization.
Optical properties. The optical characteristic of a ceramic depend on both intrinsic factor (determining color) and extrinsic (governing transparency). The color of a single crystal depends on the amount of ion in the crystal. Most single-crystal oxides transmit some visible lights; semiconducting single-crystal may appear completely black. Transparency is determined by the presence of light-scattering “flaws” such as grain boundaries and internal voids.
Industrial ceramics is applied and use in many products today such as insulator for high voltage transmission line, spark plugs for automobile and motored vehicles, turbine rotors to drive electric generator and water pumps, Ball bearings, electronic components like integrated circuit (IC) and resistors.
William M. Drilon
YizhanTech
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Http://www.yizhantech.com
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2x TDK 11mm Clip-on EMI AV Cable Noise Filter Ferrite $2.45 |
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50PC TDK 11mm Clip-on EMI AV Cable Noise Filter Ferrite $49.50 |
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18 Ferrite Cores, Tube Toroids, EMI/ RFI Chokes, or Ring Ferrites $7.49 |
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18 Ferrite Cores, Tube Toroids, EMI/ RFI Chokes, or Ring Ferrites $7.49 |
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Snap On Ferrite Date Line Filter – Radio Shack Brand $8.00 |
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Ferrite Bead on Lead, Mix 43: Lot of 10: Popular in QRP $3.99 |
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20 Ferrite Cores, Tube Toroids, EMI/ RFI Chokes, or Ring Ferrites $7.49 |
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20 Ferrite Cores, Tube Toroids, EMI/ RFI Chokes, or Ring Ferrites $7.49 |
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Clip-on Ferrite RFI / TVI Filter for Noise Suppression fits RG58 Cable $2.59 |
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2pcx TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm $2.45 |
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5 LOW PASS FERRITE FILTERS FOR CB HAM RADIO TVI PROBLEM $14.95 |
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NEW Steward EMI Suppression Ferrites Test & Design Kit $59.00 |
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NEW Steward Power/Data Line EMI Suppression Ferrites Test & Design Kit $69.00 |
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10 X BN43-2402 SMALL FERRITE BINOCULAR CORE FAIR-RITE 2843002402 $4.63 |
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50 Piece Iron powder-Ferrite core kit……QRP $15.00 |
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10 each New RCT2 RFI Radio Frequency Interference Ferrite Chokes – Black $21.95 |
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10pcx TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm m $0.90 |
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10pcx TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm m $0.90 |
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50,TDK 11mm x 30mm 1130 Clip-on RF EMI Audio Video TV Cable Noise Filter Ferrite $49.84 |
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50PCS TDK Snap On RF EMI Audio Video TV AV Noise Filter Ferrite CD Cable 11mm $49.84 |
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10, TDK Snap On RF EMI Noise Filter Ferrite Cable 10mm,2736 $9.99 |
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10,, TDK 5mm Clip-on RFI EMI Cable Filter Ferrite Core,2733 $9.99 |
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10pc TDK 10mm Clip-on RFI EMI Cable Filter Ferrite Core,2736 $9.99 |
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10pc TDK 12mm Clip-on RFI EMI Cable Filter Ferrite Core,2738 $13.99 |
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10pc TDK 7mm Clip-on RFI EMI Cable Filter Ferrite Core,2735 $9.99 |
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10pc, TDK 12mm Clip-on RFI EMI Cable Filter Ferrite Core,2738 $13.99 |
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10pc, TDK 5mm Clip-on RFI EMI Cable Filter Ferrite Core,2733 $9.99 |
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10pcs TDK 7mm Clip-on RFI EMI Cable Filter Ferrite Core,2735 $9.99 |
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10pcs TDK Snap On RF EMI Noise Filter Ferrite Cable 10mm,2736 $9.99 |
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10pcs TDK Snap On RF EMI Noise Filter Ferrite Cable 12mm,2738 $13.99 |
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10pcs TDK Snap On RF EMI Noise Filter Ferrite Cable 5mm,2733 $9.99 |
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10pcs,TDK 10mm Clip-on RFI EMI AV Wire Lead Filter Ferrite,2736 $9.99 |
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10pcs,TDK 12mm Clip-on RFI EMI AV Wire Lead Filter Ferrite,2738 $13.99 |
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10pcs,TDK 5mm Clip-on RFI EMI AV Wire Lead Filter Ferrite,2733 $9.99 |
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5pcs TDK Snap On RF EMI Noise Filter Ferrite Cable 7mm,2737 $6.99 |
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10x TDK 10mm Clip-on RFI EMI Cable Filter Ferrite Core,2736 $9.99 |
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10x TDK 12mm Clip-on RFI EMI Cable Filter Ferrite Core,2738 $13.99 |
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10x TDK 5mm Clip-on RFI EMI Cable Filter Ferrite Core,2733 $9.99 |
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10x TDK 7mm Clip-on RFI EMI Cable Filter Ferrite Core,2735 $9.99 |
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2pcs,TDK 7mm Clip-on RFI EMI AV Wire Lead Filter Ferrite,2737 $3.99 |
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10x,TDK 9mm Clip-on RFI EMI AV Wire Lead Filter Ferrite,2734 $9.99 |
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2pcs,TDK 9mm Clip-on RFI EMI AV Wire Lead Filter Ferrite,2734 $3.99 |
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500 Tiny-Sized Ferrite Core Balun Bead Toroid RF/HF/UHF $14.95 |
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LOT 3 RF PHONE TELEPHONE LINE FILTER NOISE SUPPRESOR FERRITE $9.95 |
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FERRITE Magnetic Beads FB-43-101 AMIDON BRAND NEW OLD STOCK 2 Pack of 12 pcs $9.99 |
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10pcx TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm m $0.90 |
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2pcc TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm ling $2.76 |
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10pcx TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm m $0.90 |
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3 X BN43-3312 LARGE FERRITE BINOCULAR FAIR-RITE $7.76 |
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2 X FAIR-RITE 2631101902 LARGE FERRITE TOROID. CHOKE BALUN, PA, 31 MIX! $6.19 |
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1pcs Pigtail RP-SMA Female to U.FL PCI-E Jumper Cable RF w Ferrite Adapter,BNL $0.90 |
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100 pcs TDK 11mm Clip-on RFI EMI Noise Filter Ferrites $35.99 |
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100 pcs TDK 11mm Clip-on RFI EMI Noise Filter Ferrites $99.99 |
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10pcx TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm s $0.90 |
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1pcs Pigtail RP-SMA Female to U.FL PCI-E Jumper Cable RF w Ferrite Adapter,BNL $0.90 |
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10pcx TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm s $0.90 |
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10,, TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm,2734 $9.99 |
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10pc TDK 7mm Clip-on RFI EMI Cable Filter Ferrite Core,2737 $9.99 |
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10pcs TDK Snap On RF EMI Noise Filter Ferrite Cable 7mm,2737 $9.99 |
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10pcs TDK Snap On RF EMI Noise Filter Ferrite Cable 9mm,2734 $9.99 |
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10pcs,TDK 7mm Clip-on RFI EMI AV Wire Lead Filter Ferrite,2737 $9.99 |
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10pcs,TDK 9mm Clip-on RFI EMI AV Wire Lead Filter Ferrite,2734 $9.99 |
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10 X BN43-2402 SMALL FERRITE BINOCULAR CORE FAIR-RITE $4.63 |
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Ferrite Bead w/Leads: Type FB43-5111: Mix 43: 6-Hole: Lots of 5: Popular in QRP $2.50 |
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6 each New RND6 RFI Radio Frequency Interference Ferrite Chokes $21.95 |
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VK200 AXIAL STYLE FERRITE CHOKE 2 1/2 TURNS 24GA NEW- PK OF 5- $1.80 |
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(2) #43 WHITE SNAP-ON FERRITE CORE 25-300 MHZ RG8X -58-59-LMR24 0COAX $6.25 |
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(2) #43 BLACK SNAP-ON FERRITE CORE .514″/13.05mm 25-300 MHZ RFI $6.25 |
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PCK8, TDK 9mm Clip-on RFI EMI Filter Ferrite Ferrites,F $19.94 |
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PKG5, TDK 9mm Clip-on RFI EMI Filter Ferrite Ferrites $9.99 |
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PCK 2, TDK 14mm Clip-on RFI EMI Filter Ferrite Ferrites $9.99 |
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PKG4, TDK 9mm Clip-on RFI EMI Filter Ferrite Ferrites,F $14.99 |
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PKG3, TDK 9mm Clip-on RFI EMI Filter Ferrite Ferrites,F $9.99 |
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ONE-TDKIN 13mm Clip-on RFI EMI Filter Ferrite Ferrites $9.99 |
What are Ferrite Chokes?
Ferrite beads and chokes both have impedance characteristics that can be employed as filters and safeguards to muffle unwanted interference in electronic circuits. Random high frequency signals, also know as “noise”, can cause other nearby circuits to fail to operate correctly.
An analogy for unwanted noise on top of the signal is being at a party and trying to have an intimate conversation with someone you can’t hear because everyone else around you is being too loud. In circuits, through electromagnetic coupling, a circuit that has extremely sharp pulses can induce extra signals over and above the main signal in a nearby circuit and thus becomes a source of noise, which makes it almost impossible for the receiving circuit to interpret the main signal.
So, what exactly are these things? A ferrite bead or choke is a non-resistant electronic member composed of ferromagnetic compounds that contain iron and trace amounts of nickel, zinc, or manganese oxides. The impedance properties of the ferrite choke allow it to act with a high resistance to high frequency signals and low resistance to lower frequency signals. This way, the high frequency noise is damped out and the absorbed energy is converted to a very small amount of heat. The type of ferrite material used in the bead will determine the range of frequency suppression, and the physical dimensions and shape of the ferrite bead determine the amount of suppression possible.
The beads themselves can be nothing more than a dowel-type device that has a hole in the center or something that looks like a metal blob, which is really a multi-layer bead utilized in surface mount applications. Electromagnetic Interference (EMI) suppression beads, which are comparable to inductors, are designed to rise in the transmission of signals with frequency until a resonance point. While a regular inductor’s wave propagation would begin to drop as frequency continued to increase, the ferrite bead inductance flattens out and acts as a perfect muffler for a wide frequency band.
One extremely basic use of ferrite chokes is on computer cables. You’ve probably seen these before; they look like a bump or a cylinder in the cable. These cylinders are snap-on ferrite beads that suppress the potential RF interference from the cables.
They can also be used in cell phones. There is no agreement on whether the radiation that emanates from cell phones will result in damage to one’s brain, and there are various devices being offered for sale like ferrite chokes or shields that are crafted with the intention of suppressing the radiation and the interference from the phone. If your cell phone is located anywhere near the speakers of your PC, you will actually hear this interaction of sound waves or interference.
Usually what happens is that you hear an irritating buzzing, which occurs because the cables on those speakers pick up the energy transmitted from your cell phone. Besides adding beads to your own telephone, you might also want to put snap-on-beads on your speakers to muffle the interference (unless you want the two second alarm that your phone is about to ring).
Because today’s circuits are faster and more of them are packed onto a circuit board, it is extremely desirable to employ ferrite beads and other techniques to suppress noise. Digital designers only think in terms of ones and zeros signaling until they uncover the nightmare of the sphere of analog where there is noisy circuit conduct or interference from power supplies or problems with grounding.
Besides protecting yourself from your own circuits, there are numerous “harden applications” where you need to protect the circuits and muffle any noise caused by external sources. An example would be a strong transmitter such as a cell phone accidentally being operated on a plane or a more purposeful attempt to jam a military application.
Ferrite bead and chokes are basic devices that can serve as the first line of defense for RF muffling and other noise suppressing uses. A company that produces beads can give you the arcs of impedance vs. the frequency for the beads they manufacture; typically their application engineers can assist you in choosing the correct type of bead.
About the Author
Cameron Tacassi works extensively with electronics, adding ferrite chokes and Pulse transformers to speed the functioning of electronic equipment. While not from an inductor manufacturer, Cameron still knows just about everything about custom magnetics and chip inductors, as well as quite a bit about power transformers and, his personal favorite, the rf transformer.
Fair-Rite Products Corp., a leader in ferrites for EMI suppression, power and antenna / RFID solutions, is reported …- Rite Products' Fair High Frequency toroidal Kit is the latest addition to its extensive selection of engineering equipment. All Fair-Rite kits are designed to assist the engineer with a wide variety ferrite solutions for applications including medical, industrial, lighting, transportation, alternative energy and power.
