Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Carbides
Carbides of titanium, zirconium, boron and silicon are significant refractory materials. Though, the carbides have extremely high melting points so they lack oxidation resistance.
Carborundum, a well identified abrasive material is silicon carbide or SiC. Such material has extremely high hardness, high thermal conductivity, extremely high refractoriness, and has semi-conducting nature. Silicon Carbide's electrical conductivity is low at low temperature but raises by order of magnitude at high temperatures. When 60 percent sand and 40 percent coke along with some saw salt and dust and heated in an electric arc furnace at a temperature of about 1425oC, the resulting product is Silicon Carbide. The SiC removed from the furnace is a mass of interlocking crystals. Several shapes may be acquired when SiC is ground, mixed along with binding agent, fixed and shaped. The most widely and oldest utilized is the clay bonded material. Within this material refractory clay is added as the bonding agent. The bond in such combination softens at 1200-1500oC. Silicon and silicon nitride, are other binding materials. Silicon bonded Silicon Carbide also has its employ limited to a temperature below 1500oC due to loss in bond strength. Silicon nitride bonded SiC, though, retains its strength at great higher temperature and shows also much better shock resistance. Though a monoxide, a layer of SiO2 is formed on SiC. Such oxide layer protects SiC from more oxidation. Adding of 0.5 to 1% B throughout sintering helps uniform structure and imparts stability. SiC fibres have been utilized as reinforcement in metal and ceramics. Reaction bonded SiC is made via two distinct processes. In one procedure a compact of SiC, an organic and carbon binder is infiltrated via liquid Si that bonds the particles by formation of additional SiC. The free Si might be leached out along with acid to leave an open porous refractory. Thin walled coating or components of SiC is produced via decomposition of gas mixture containing both Silicon and C on a heated substrate. The fuel elements of high temperature gas cooled elements are produced via this process. Recently slip casting has also been utilized for silicon carbides. It has resulted in products of superior refractoriness, density, abrasion resistance and high strength, and good chemical resistance also. Silicon carbide refractories are characterized via low thermal expansion and high thermal conductivity. They tend to oxidize gradually in air at a temperature range of 900-1300oC.
temperature measurement by thermocouple
Discuss relative demerits and merits of belt, rope and chain drive for transmission of power and find the condition for transmitting the maximum power in a flat belt drive.
The Diameter Dimension Command You can use the Diameter command to annotate a circle or an arc with a diameter dimension. To achieve this simply start the command, pick a point
PROBLEM 1 (30 points) Consider a Boeing 747-400 at weight close to the maximum takeo? weight (MTOW) cruising at Mach 0.82 at an altitude of 32000 ft. (a) How much thrust is needed
explain with suitable eg. static and dynamic force analysis
Explain Internal Broaching - Types of Broaching Internal broaching operation is adopted for producing internal surface such as holes, keyways and teeth of an internal gear for
Quenching and Tempering Cast iron pearlite structure might be heated to lower critical temperature and after that quenched to effect extremely rapid cooling. This treatment re
Main Factors to be Considered when Selecting Material The main factors to be considered when selecting a material to meet some specific requirement are: Fitness of use,
what is roof & truss.kingpost
Clutch cable model: Ensure the cables fitted are of the respective model and not interchanged with other model. Also ensure that the cable is genuine.
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd