Blending or mixing, Other Engineering

To achieve successful results in powder metallurgy the metallic powder must be thoroughly homogenized. The term blending and mixing are both used in this content. Blending refers to intermingling powders of the same chemical compositions but possibly different particles size. Mixing refers to combining powder of different chemistries. The mixing or the blending of metal powder before composition is down for the following purposes.

(i)            To obtain uniform distribution of particle size.

(ii)          To combine two or more metal powder to create desired alloy and

(iii)         To coat particle with the lubricant.

       Mixing can be done either wet or dry. Lubricants such as graphite or stearic acid are used in the mix to improve flow characteristics of the powder and reduce wear. Binders, which are required in some cases to achieve adequate strength in the pressed but unsintered part. Deflocculants, which inhibit characteristics during feeding. Percise control of the volume of the raw powders and the quantity of lubricants used is essential in blending process.

       The best mixing is obtained when all particles have essential in blending process. The best mixing is obtained when all particles have similar size shape and density. The blending and mixing are done by mechanical means and are as follows shown in figure.   

       (i) Rotation in a drum,                 (ii) Rotation in double-cone container,

      (iii) Agitation in screw mixer,       (iv) Stirring in a blade mixer.

      The containers are usually designed with internal baffles or other ways of preventing free-fall during blending of powders of different size, because variations in setting rates between sizes result in segregation. Vibration of the powder is undersirable, since it also causes segregation. Best results seem to occur when the container is between 20% and 40% full.

Posted Date: 8/3/2012 4:55:04 AM | Location : United States







Related Discussions:- Blending or mixing, Assignment Help, Ask Question on Blending or mixing, Get Answer, Expert's Help, Blending or mixing Discussions

Write discussion on Blending or mixing
Your posts are moderated
Related Questions

description about modulus of rupture machine & different parts of bending strength machine

Q. Describe the terms "Solids zone", "Mushy Zone" and "Liquid Zone" used in solidification of casting and explain directional solidification in casting. Ans. Solidificati

Nozzle Guide Vane Inspection: Inspection of the NGVs is possible using a strong light source and mirror, it is more probable however that a boroscope inspection will be require

Linear state space equations Linear state space equations consist of a (difierential) state equation? x = Ax + Bu and an (algebraic) output equation y = Cx + Du whe

iron crabon diagram with reactions


please tell me in detail that what is earth summit??????????