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Silicon Nitride Ceramic
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 25 1/16" Silicon Nitride ceramic Si3N4 bearing balls  US $18.00
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 Ten 1/16" Silicon Nitride ceramic Si3N4 bearing balls US $8.00
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Sector 9 Skateboards Race Bearings - Ceramic One Color, One Size List Price: $69.98 Sale Price: $69.00  |
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The Sector 9 Ceramic Race Bearings are not cheap. But they are fast. Really, awesomely, scary fast. Your mom does not approve. Neither do your buddiesAAAbut that's just because they won't be able to catch you.Product FeaturesMaterial: silicon nitride ceramicABEC Rating: 7Recommended Use: going nuclear fastManufacturer Warranty: limited |
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Sector 9 Skateboards Race Bearings - Ceramic |
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The Sector 9 Ceramic Race Bearings are not cheap. But they are fast. Really, awesomely, scary fast. Your mom does not approve. Neither do your buddiesAAAbut that's just because they won't be able to catch you.Product FeaturesMaterial: silicon nitride ceramicABEC Rating: 7Recommended Use: going nuclear fastManufacturer Warranty: limited |
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Phase Diagrams in Advanced Ceramics (Treatise on Materials Science and Technology) List Price: $180.00 Sale Price: $61.99 |
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The investigation of multi-component complex systems composed of oxides, nitrides, and carbides has intensified in the last few years. Phase Diagrams in Advanced Ceramics reviews some of the recent advances inthe understanding of these composite systems, providing insight into how phase diagrams can be utilized in the fabrication of whiskers and ceramic-matrix whisker-reinforced ceramics. Phase relations and sintering information is reviewed for transparent polycrystalline oxides. Phase diagrams are discussed to predict alkali oxide corrosion of alumino-silicate references. Key Features* This Treatise Provides Coverage of:* Understanding the development, manufacture, and use of complex, multi-component ceramic materials composed of silicon nitride-metal oxides-nitride-carbide systems* Development and use of whisker and whisker-reinforced ceramics composed of materials such as alumina, silicon-nitride, silicon carbide, and directly solidified eutectic ceramics* Application of phase diagrams to the production of advanced composites such as alumina-matrix, zirconium diboride and titanium, hafnium, zirconium, carbides, and borides* Phase chemistry in the development of transparent poly-crystal and oxides, including yttria, alumina, and magnesium aluminate* Improvements concerning the knowledge of complex multi-component materials composed of oxides, nitrides, and carbides, and knowledge of how to fabricate composite materials containing whiskers and ceramic hosts* New developments in making transparent ceramic materials |
Featured Article:
Introduction
Have you ever wondered about the myriad materials from which stuff is made that we come across in our daily life? The numerous materials which have unique characteristics and which are used for making various articles used in everyday life- these materials attract the attention of the young inquisitive minds in engineering classrooms all over the world.
Today, let me introduce you to the world of "CERAMICS".
"Ceramics" are the materials which are often misunderstood as materials used merely for pottery and decorative objects. Even though the word ceramic is derived from the Greek word "Keramos", meaning potter's clay or pottery, what many people don't realize is that ceramics play an important role almost everywhere you see and many times in places that you can't.
Besides the everyday objects of glassware and floor tiles, the ceramics of today are critical in helping computers and other electronic devices operate, in medical devices for improving people's health in various ways, in providing global telecommunications, and in protecting soldiers and vehicles during combat.
Ceramics are generally defined as inorganic, non-metallic materials that are made from powdered chemicals. They are typically crystalline in nature (their atoms are arranged in a systematic manner) and are compounds formed between metallic and non-metallic elements such as aluminum and oxygen (alumina, Al2O3), calcium and oxygen (calcia, CaO), silicon and nitrogen (silicon nitride, Si3N4), and so on.
Various "advanced ceramic" products are manufactured by combining high-purity chemicals into desired shapes and then heating them to very high temperatures. The shaped ceramic products thus made can have many desirable properties such as heat resistance, hardness, strength, low electrical conductivity, and unique electro-mechanical characteristics. Thus advanced ceramics are ceramics which are made by tightly controlled methods and therefore they exemplify an "advancement" over the general definition. As a consequence of these refined methods, a new class of ceramics called "advanced ceramics" is born.
Long lasting and harder than steel, advanced ceramics may be found in aircraft engines, automotive engines, cutting tools used for making metal products, the skin of space shuttles, knives, bullet proof armor, artificial hip-joints, computers and microelectronics.
History
One of the first uses of advanced ceramics was for corrosion-resistant stoneware vessels in the chemical industry as early as the 1750s.Then came porcelain, which was first used in dentistry in the 1850s. With the invention of electric light in the 19th century, ceramic materials based on porcelain for electrical insulation were developed.
This was followed by the blooming of the radio and television broadcasting industry in the 20th century, which needed special heat resistant materials that could withstand the high-frequency electromagnetic fields. As a result, electro-ceramics such as steatite were developed. Subsequently, other electro-ceramics such as magnetic ceramics (ferrites) were developed, followed by capacitor ceramics (titanates) and electro-mechanical ceramics (piezoelectric ceramics). In the later part of the 20th century, the need for protecting tiny transistors and ICs from ambient conditions led to the development of ceramic packaging materials which facilitated further miniaturization.
Concurrent with the development of electro-ceramics, another sub-class of advanced ceramics which came to be called structural ceramics progressed, which had high structural and chemical integrity characterized by properties such as extremely high hardness, stiffness, and heat and chemical resistance. These structural ceramics found applications in various industries, for example in the space industry as heat and wear resistant tiles and nose cones on space shuttles, in the aerospace industry as bearings and turbine rotors, in the chemical industry as chemical resistant seals and conduits, in the defence industry as bullet-proof vests and armor plates for vehicles, in the biomedical industry as hip-joints, knee-joints and orbital implants, and so on.
Further Developments
As ceramic technology has rapidly progressed over time, the definition of advanced ceramics has expanded to include a much wider range of compositions used in a large variety of applications. In broader terms advanced ceramics also include glass (which has a non-crystalline or amorphous random atomic structure), enamel (a type of glassy coating), glass-ceramics (a glass which is partly crystallized), and inorganic cement-type materials (cement, concrete, plaster and lime).
Advanced ceramics include yet another sub-class of ceramics called refractories. Refractories are critical materials which reduce heat losses from industrial ovens, also called kilns, and at the same time they resist very aggressive conditions including chemical and acid attack, very high temperatures (up to 3200°F), abrasion, mechanical impact, and more. These refractory ceramics enable manufacturers of commodities such as metals, alloys, cement, glass, etc to operate efficiently and profitably. Thus they play a very important role in growing the global economy.
Advanced ceramics continue to be developed even further; new ceramics and their combinations are constantly being improved and newer products are continually being introduced in various industries.
The progress in advanced ceramics is so rapid that the advanced ceramics of today are strikingly different from those made even a few years ago. Ceramic engineers eagerly anticipate further rapid developments of newer ceramic materials and their combinations that will find even more exciting applications in the future.
Want to know more about advanced technical ceramics, how they are made and their various uses? Interested in following the latest developments of these materials? Interested in getting information and technical advice in this field? Just visit [http://www.ceramics411.com].
Longboard Skateboard Bearings - Bearing For a Smoother Longboarding
A longboard skateboard differs from the regular skateboard in many ways. As such, it has its own requirements for the types of deck, trucks, wheels and bearings that are needed to build a customized longboard skateboard. The bearings of a skateboard help to determine the speed at which the wheels roll which in turn determines the speed of the skateboard. As such, it is important to select the longboard skateboard bearings required for building your personalized longboard skateboard with utmost care.
Bearings are metallic or ceramic rings containing small balls made of either ceramic or other metals. They are fitted inside the wheels and they rotate the axles of the truck, which is in turn responsible for propelling the skateboard. Therefore you should make sure that the components selected by you are meant for a longboard skateboard and also that the various components are compatible with one another. All these factors should be taken into account before purchasing your longboard skateboard bearings.
When selecting longboard skateboard bearings you have two options - steel bearings and ceramic bearings. Steel bearings are bearings with both the outer ring as well as the balls within them made of steel. Likewise ceramic bearings encompass ceramic balls within them. Steel bearings are meant for use in skateboards for the average skateboarder. Ceramic longboard skateboard bearings have been specially designed to meet the demands of the expert skateboarders. The ceramic bearings are primarily composed of ceramic zirconium oxide and ceramic cerbec silicon nitride. Though these cost much more than the steel bearings, performance wise they are more suitable for use as longboard skateboard bearings.
The rust resistant ceramic bearings are lighter than their steel counterparts. They have a longer life span if maintained well and even roll more smoothly. They have a lower degree of friction owing to their thermal resistance as such the ceramic longboard skateboard bearings are considered ideal for high speed downhill racing for which the longboard skateboards are most commonly used. The longboard skateboard bearings make the longboard skateboards a good mode of transportation, since the ceramic bearings provide a smoother rolling experience. The ceramic bearings being light in weight provide a good opportunity for skateboarders to try out certain tricks with their longboard skateboard.
While selecting the longboard skateboard bearings for your skateboard, do check out the quality. You would realize that some of the better quality bearings for your longboard skateboard available in the market are priced quite high. Unlike, the other hardware and accessories that you would buy for your longboard skateboard, where the quality and price are not related to each other and the quality of the bearings would be directly proportional to their price.
For the longboard skateboard bearings to have a longer life span and to even continue to roll smoothly it is essential that you take adequate care of them. Maintaining and cleaning them well with the help of skateboard bearing lube at regular intervals will ensure that you have a wonderful longboarding experience for many more days to come.
About the Author
Roberta is an expert in the field. If you want
longboard skateboard bearings
and more information on
skateboard
Please visit: http://www.goskateorgohome.com
Amedica® Receives Patents For Innovative Motion-Preserving Total Disc Implant Featuring Silicon Nitride
Amedica Corporation, a spinal and orthopaedic implant and instrument company focused on unique silicon nitride (SiN) ceramic technologies, announced that it has been granted two United States patents for its total disc replacement (TDR) technology that features the use of silicon nitride in the construction of the complete implant. U.S. Patent No. 7,758,646 B2 and U.S. Patent No. 7,771,481 B2 ...
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