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!
Q. Define Oxidation Process?
Oxidation is defined as a loss of electrons, as when a metal goes from the metallic state to the corroded state. When a metal reacts with oxygen, it forms an oxide and the metal is said to be oxidized. Elevated temperatures can significantly increase the rate of oxidation.
Generally speaking, scale growth due to oxidation is proportional to the square root of the exposure time (i.e. it is a parabolic relationship). Three different forms of iron oxide may form, depending on the temperature and the concentration of oxygen available, FeO (wustite), Fe2O3 (hematite) and Fe3O4 (magnetite). The growth of the oxide scale is based on the diffusion rate of oxygen through this layer, which can then continue to react with the iron. In order for the scale to provide a protective layer, the oxide must be tightly adherent and occupy a greater volume than the metal from which it is formed.
The addition of alloying elements such as chromium (Cr), nickel (Ni), as well as small quantities of silicon (Si) and aluminum (Al) improves the oxidation resistance of iron-base alloys. The formation of a stable oxide layer on high temperature materials is a significant factor in providing an acceptable service life. Service conditions that are likely to disrupt the formation of such scales are detrimental (e.g. reducing atmospheres). Unexpected catastrophic failures from oxidation are very unlikely for most high temperature alloys.
Hybrid Sweep It combines linear and/or non-linear sweep via set operations. In this case, two point sets are swept in two different directions and the two resulting swept volum
Clutch free play : Check for free play of the clutch lever. It should be within 10-20 mm.
Define Supports Pins and Jack Pins When the work is clamped directly in the body of the jig or fixtures, there is always a chance of error due to improper supports on accounts
The spring controlled governor of the Hartung type has two rotating masses each of 2.5kg and the limits of their radius of rotation are 100 mm and 125 mm. The each mass is directl
Thermit Welding This process utilises the intense heat developed during the reaction between iron oxide and aluminium. When a mixture of three parts of iron oxide and one part
Edge joints: The flanged edge joint is suit- able for plate 1/4 inch or less in thickness and can only sustain light loads. Edge preparation for this joint may be done.
A long hollow cylinder has outer and inner radii 150 mm and 50mm respectively. It create heat at a rate of 1kW/m³ (k= 0.5 W/m ºC). If the maximum temperature obtain at radius of 10
What do you mean by refrigeration system
If Low Resistance or Very High Current in Primary Coil Circuit Causes of Problem Remedy Primary ignition coil short circuited
Determine the Forces On Bar Two bars and a cable are used to support a block as shown. The two bars have negligible weight and the pulley is free to rotate. The mass of the pu
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd