Describe mould surface coating, Mechanical Engineering

Assignment Help:

Describe Mould Surface Coating?

Mould surfaces are coated (after the pattern is drawn out) with certain materials possessing high refractoriness. It eliminates the possibility of burn-on and enables casting with smooth surface to be obtained. However, the permeability of the mould gets reduced. Therefore, the Coating should not contain gas forming materials. Mould surface coating which are also known as facings, dressings, washes, blackings or whitening, may be applied dry(by dusting) or wet in the form of thin cream. The various mould surface coating materials include: Coal dust, pitch, graphite, china clay, Zircon flour or French chalk (Calcium oxide).


Related Discussions:- Describe mould surface coating

Explain the use of bare electrode, Q. Explain the use of bare electrode? ...

Q. Explain the use of bare electrode? This type of electrode is also known as plain electrode. No flux covers on this electrode. These types of electrodes are used for D.C. sup

Design bulk materials storage, Q. Design Bulk Materials Storage? Consid...

Q. Design Bulk Materials Storage? Consideration shall be given to providing access to safety showers in areas of hazardous bulk material handling and storage. Where bulk handli

Shaft, Shaft: What is shaft? What duty is performed by shaft? What is...

Shaft: What is shaft? What duty is performed by shaft? What is the usual cross section and of what material it is generally made? Sol.: The shafts are generally cylindr

What is specific gravity?, What is specific gravity? what do you mean by 1p...

What is specific gravity? what do you mean by 1pascal? Concept of pressure difference? Sol) The "specific gravity" of a meterial is the ratio of its density to the density of

Air-conditioning guidelines, The following guidelines are intended to assis...

The following guidelines are intended to assist the HVAC lead, designer or auditor in preparing an assessment of the quality of the HVAC engineering work for a specific project. T

Stenght of Material, Give the assumption of pure torsion derivation of shea...

Give the assumption of pure torsion derivation of shear stress produced in circular shaft subjected to torsion

Calculate the time required to complete the job, Five jobs are performed fi...

Five jobs are performed first-on Machine-I and then on Machine-II. Time in hours taken by each job on each machine is given below :

Explain the standard for exchange and transfer, Standard for Exchange and T...

Standard for Exchange and Transfer (SET) The interface SET is a standard for the exchange of all data which is generated for CAD/CAM. It is a French development and was first p

Fracture mechanics, difference between stress intensity factor and stress c...

difference between stress intensity factor and stress concentration factor

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