Carbon and graphite, Mechanical Engineering

Assignment Help:

Carbon and Graphite

Both are excellent refractory materials but with good grace oxidize and thus are used merely either in neutral or reducing conditions. Graphite is more stable form of carbon. The amorphous carbon is transformed in crystalline graphite on prolonged heating at about 2500oC. Sublimes at a temperature of 4200oC but Graphite doesn't melt. Graphite and Carbon are highly resistant to acids, alkalies and each solvent except oxidizing ones.

Graphite is utilized at high temperature as rocket nozzle or else nozzle throat insert. The graphite nozzles are coated along with silicon carbide, impregrated with Zr or molybdenum silicate to enhance oxidation resistance. The molten Zr with that graphite surface is impregrated forms zirconium carbide along with good chemical bond along with graphite surface. The outer surface is oxidized to zirconia whereby extra oxidation is stopped.

Graphite and Carbon are utilized in industry in fabricated and non-fabricated forms. Within fabricated forms carbon and graphites are utilized as materials of construction for electrodes, chemically resistant equipment, nuclear reactors and refractory. Carbon and graphite both shapes produced via common techniques are porous. They can be made impervious to fluids by impregnating along with synthetic resin, normally of phenolic type and after that curing resin at high temperature.

 


Related Discussions:- Carbon and graphite

Define the isolated and combined footings, Isolated and Combined Footings ...

Isolated and Combined Footings Individual columns are generally supported on isolated footings. A typical isolated footing is shown in Figure. This arrangement is suitable when

Laws of solid friction, Laws of solid friction: Sol.: The friction w...

Laws of solid friction: Sol.: The friction which exists between two surfaces that are not lubricated is called as solid friction. The two Surfaces can be at rest or one of t

The brasses-copper alloys, The Brasses 70/30 brass also called as cart...

The Brasses 70/30 brass also called as cartridge brass contains 70% copper and 30% Zinc. This is employed for cartridge cases, sheet fabrication, and condenser tubes and for u

Determine the value of shunt connected capacitance, An electric heating ele...

An electric heating element is rated at 4.0kW when connected to a single phase 240Vrms, 50 Hz AC supply, and is known to have a power factor of 0.833 lagging. 1. Calculate the c

Evaluate the specific enthalpy - thermodynamics, Evaluate the specific enth...

Evaluate the specific enthalpy - thermodynamics: Steam is being generated in a boiler at a pressure of 15.25 bar. Calculate the specific enthalpy when ( i )  Steam i

Calculate the outer diameter of hollow shaft, A solid shaft of diameter d i...

A solid shaft of diameter d is taken in power transmission. Because of modification of existing transmission system, it is needed to replace the solid shaft by a hollow shaft of th

Principle of superposition, Principle of superposition: Explain the p...

Principle of superposition: Explain the principle of superposition. Sol.: A machine member is subjected to number of forces acting on its outer edges and also at some

Logistics - inbound and outbound, Logistics - Inbound and Outbound: Lo...

Logistics - Inbound and Outbound: Logistics plays a vital role in designing and shaping of SCM in a firm. Without an effective logistics system the effectiveness of the firms

Types of polymerisation, Types Of Polymerisation When some of bifunctio...

Types Of Polymerisation When some of bifunctional molecules connect in a chain structure, the reaction is termed as addition polymerisation.  However, these polymerizations do

Explain basic types of sand testing, Q. Explain basic types of Sand testing...

Q. Explain basic types of Sand testing? Moulding sands should be of proper quality to meet the required level of accuracy and surface finish of castings. Proper quality of the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd