Cerámica Wiki
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[[Image:Ceramic magnets.jpg|thumb|A stack of ferrite magnets]]
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[[Image:Ceramic magnets.jpg|thumb|A stack of ferrite magnets|vínculo=Special:FilePath/Ceramic_magnets.jpg]]
   
 
[[Category:Ceramic materials]]
'''Ferrites''' are a class of [[chemical compound]]s with the [[Chemical formula|formula]] AB<sub>2</sub>O<sub>4</sub>, where A and B represent various metal [[cation]]s, usually including iron. These [[ceramic]] materials are used in applications ranging from magnetic components in microelectronics.
 
 
[[Category:Types of magnets]]
   
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Load Cell Sensors
Ferrites are a class of [[spinel]]s, materials that adopt a crystal motif consisting of cubic close-packed (FCC) oxides (O<sup>2-</sup>) with A cations occupying one eighth of the octahedral holes and B cations occupying half of the octahedral holes. The magnetic material known as "ZnFe" has the deceptively simple formula ZnFe<sub>2</sub>O<sub>4</sub>, with Fe<sup>3+</sup> occupying the octahedral sites and half of the tetrahedral sites. The remaining tetrahedral sites in this spinel are occupied by Zn<sup>2+</sup>.<ref>Shriver, D. F.; Atkins, P. W.; Overton, T. L.; Rourke, J. P.; Weller, M. T.; Armstrong, F. A. “Inorganic Chemistry” W. H. Freeman, New York, 2006. ISBN: 0-7167-4878-9.</ref>
 
   
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[https://sensomaticloadcell.com/ Sensomatic] promoted by Sensotech, one of the best & leading Load cell manufacturers in India. Sensotech Incorporated in 2004, at Chennai, an ISO 9001:2015 certified company & Certified by UKAS & SGS.
== Properties ==
 
Ferrites are usually non-conductive [[ferrimagnetism|ferrimagnetic]] ceramic compounds derived from [[iron oxide]]s such as [[Hematite|hematite]] (Fe<sub>2</sub>O<sub>3</sub>) or [[Magnetite|magnetite]] (Fe<sub>3</sub>O<sub>4</sub>) as well as [[oxides]] of other metals. Ferrites are, like most other ceramics, hard and [[brittle]]. In terms of the magnetic properties, ferrites are often classified as "soft" and "hard" which refers to their low or high [[coercitivity]] of their magnetism, respectively.
 
   
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===Soft ferrites===
 
Ferrites that are used in [[transformer]] or [[electromagnetic]] [[Magnetic core|cores]] contain [[nickel]], [[zinc]], or [[manganese]] compounds. They have a low [[coercivity]] and are called '''soft ferrites'''. Because of their comparatively low losses at high frequencies, they are extensively used in the cores of [[SMPS|Switched-Mode Power Supply (SMPS)]] and [[Radio Frequency|RF]] transformers and [[inductor]]s. A common ferrite, abbreviated "MnZn," is composed of the oxides of manganese and zinc.
 
   
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===Hard ferrites===
 
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In contrast, permanent ferrite magnets (or "hard ferrites"), which have a high [[remanence]] after magnetization, are composed of iron and [[barium]] or [[strontium]] oxides. In a magnetically [[Saturation (magnetic)|saturated]] state they conduct [[magnetic flux]] well and have a high magnetic [[permeability (electromagnetism)|permeability]]. This enables these so-called ''ceramic magnets'' to store stronger [[magnetic field]]s than iron itself. They are the most commonly used magnets in radios. The maximum magnetic field ''B'' is about 0.35 [[tesla (unit)|tesla]] and the magnetic field strength ''H'' is about 30 to 160 kiloampere turns per meter (400 to 2000 [[oersted]]s). (Hill 2006)
 
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* Capacious warehousing & packaging facility
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* Managed by experienced professionals
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* Customized products
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* Competitive Price
   
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Sensotech provides comprehensive planning, testing and management for industry leaders in space, on land and at sea. Our Load Cells and Force Sensors are specifically built for your application and are technologically advanced. We offer load cells, strain gauges, weigh modules, sensors, indicators, load cell accessories and the custom product you need.
== Production ==
 
Ferrites are produced by heating an intimate mixture of powdered precursors are heated and pressed in a mold. During the heating process, calcination of [[carbonate]]s occurs:
 
:MCO<sub>3</sub> → MO + CO<sub>2</sub>
 
The oxides of barium and strontium are typically supplied as their carbonates, [[Barium carbonate|BaCO<sub>3</sub>]] or [[Strontium carbonate|SrCO<sub>3</sub>]].
 
The resulting mixture of oxides undergoes [[Sintering|sinter]]ing. Afterwards the cooled product is milled to particles smaller than 2 μm in order to produce [[Weiss domains]] in the size of one particle. Next the powder is pressed into a shape, dried, and re-sintered. The shaping may be performed in an external magnetic field, in order to achieve a preferred orientation of the particles ([[anisotropy]]).
 
   
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We are supplying our products for Medical Applications, Neonatal, Health Care, Food & Pharmaceutical, Automobile, Oil & Gas, Aerospace, Marine, Aviation, Textile & Paper, Military, Mines & Petro Chemical, Rail & Road Weigh Bridge, Poultry Equipment, Steel & Cement Industries & Chemical Industrial Applications.
Small and geometrically easy shapes may be produced with dry pressing. However, in such a process small particles may agglomerate and lead to poorer magnetic properties compared to the wet pressing process. Direct calcination and sintering without re-milling is possible as well but leads to poor magnetic properties.
 
 
Electromagnets are pre-sintered as well (pre-reaction), milled and pressed. However, the sintering takes place in a specific atmosphere, for instance one with an [[oxygen]] shortage). The chemical composition and especially the structure vary strongly between the precursor and the sintered product.
 
 
==Uses==
 
[[ferrite bead|Ferrite cores]] are used in electronic [[inductor]]s, [[transformer]]s, and [[electromagnet]]s where the high [[electrical resistance]] of the ferrite leads to very low [[eddy current]] losses. They are commonly seen as a lump in a computer cable, called a [[ferrite bead]], which helps to prevent high frequency electrical noise ([[radio frequency interference]]) from exiting or entering the equipment.
 
 
Early [[computer memory|computer memories]] stored data in the residual magnetic fields of hard ferrite cores, which were assembled into arrays of ''[[core memory]]''. Ferrite powders are used in the coatings of [[magnetic tape|magnetic recording tapes]]. One such type of material is [[iron (III) oxide]].
 
 
Ferrite particles are also used as a component of radar-absorbing materials or coatings used in [[Stealth technology#Stealth principles|stealth]] aircraft and in the expensive absorption tiles lining the rooms used for [[electromagnetic compatibility]] measurements.
 
 
Most common radio magnets, including those used in loudspeakers, are ferrite magnets. Ferrite magnets have largely displaced [[Alnico]] magnets in these applications.
 
 
It is a common magnetic material for [[pickup (music)#Magnetic pickups|electromagnetic instrument pickups]], because of price and relatively high output. However, such pickups lack certain sonic qualities found in other pickups, such as those that use Alnico alloys or more sophisticated magnets.
 
 
==References==
 
<references/>
 
==External links==
 
* [http://computer.howstuffworks.com/question352.htm What are the bumps at the end of computer cables?]
 
 
==Manufacturers==
 
* [http://www.ti-electronic.com/ferrite/en TI-Electronic]
 
* [http://www.acme-ferrite.com.tw/ Acme-Ferrite]
 
* [http://www.tdk.co.jp/ TDK]
 
* [http://sfil.exportersindia.com/ Strontium Ferriten India Limited]
 
 
==Sources==
 
* Meeldijk, Victor ''Electronic Components: Selection and Application Guidelines'', 1997 Wiley [ISBN 0-471-18972-3]
 
* Ott, Henry ''Noise Reduction Techniques in Electronic Systems'' 1988 Wiley [ISBN 0-471-85068-3]
 
* Luecke, Gerald and others ''General Radiotelephone Operator License Plus Radar Endorsement'' 2004, Master Pub. [ISBN 0-945053-14-2]
 
* Bartlett, Bruce and others ''Practical Recording Techniques'' 2005 Focal Press [ISBN 0-240-80685-9]
 
* Hill Technical Sales [http://www.hilltech.com/products/emc_components/Amorphous_Shielding.html]
 
* Schaller, George E. ''Ferrite Processing & Effects on Material Performance'' [http://www.cmi-ferrite.com/News/Papers/ferpro.pdf]
 
 
[[Category:Ceramic materials]]
 
[[Category:Types of magnets]]
 
   
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Our goal is to assist businesses in improving their force and torque measurements in order to increase the accuracy of the end product. We serve our clients first and work with companies of all sizes to improve their measurements. We are always on the hunt for creative problem solvers who are eager to plan and develop new ideas.
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[[fa:آهنربای فریتی]]
 
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[[ja:フェライト磁石]]
 
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Revisión del 07:32 6 ene 2022

Archivo:Ceramic magnets.jpg

A stack of ferrite magnets

Load Cell Sensors

Sensomatic promoted by Sensotech, one of the best & leading Load cell manufacturers in India. Sensotech Incorporated in 2004, at Chennai, an ISO 9001:2015 certified company & Certified by UKAS & SGS.

Why Us?

  • Innovative & unique designs
  • On-time delivery schedule
  • The well-equipped R&D department
  • Capacious warehousing & packaging facility
  • Managed by experienced professionals
  • Customized products
  • Competitive Price

Sensotech provides comprehensive planning, testing and management for industry leaders in space, on land and at sea. Our Load Cells and Force Sensors are specifically built for your application and are technologically advanced. We offer load cells, strain gauges, weigh modules, sensors, indicators, load cell accessories and the custom product you need.

We are supplying our products for Medical Applications, Neonatal, Health Care, Food & Pharmaceutical, Automobile, Oil & Gas, Aerospace, Marine, Aviation, Textile & Paper, Military, Mines & Petro Chemical, Rail & Road Weigh Bridge, Poultry Equipment, Steel & Cement Industries & Chemical Industrial Applications.

Our goal is to assist businesses in improving their force and torque measurements in order to increase the accuracy of the end product. We serve our clients first and work with companies of all sizes to improve their measurements. We are always on the hunt for creative problem solvers who are eager to plan and develop new ideas.