Department of mechanical department sset 2014 page1 module iii powder metallurgy powder metallurgy pm is a metal working process for forming precision metal components from metal powders. Micromachining is the basic technology for fabrication of micro components of size in the range of 1 to 500 micrometers.
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Creating micro features or surface characteristics especially surface finish in the micronano level.
Micromachining notes. The metal powder is first pressed into product shape at room temperature. Etching dry or wet etching is the principal technique used in bulk micromanufacturing. No notes for slide. Bulk micromanufacturing bulk micromanufacturing technique involves creating 3 d components by removing materials from thick substrates silicon or other materials using primarily etching method. Removal of material in the form of chips or debris having the size in the range of microns. 26 where ddiffusivity of oxide in silicon eg d44 x 10 16cm2s at 900oc d oinitial oxide layer 200 in dry oxidation0 for wet oxidation k ssurface reaction rate constant n oconcentration of oxygen molecules in the carrier gas 52 x 1016moleculescm3 in dry o 2 at 1000 oc and 1atm 3000 x 1016 moleculescm3 in water vapor at the same temperature and pressure. Explore micromachining with free download of seminar report and ppt in pdf and doc format. Also explore the seminar topics paper on micromachining with abstract or synopsis documentation on advantages and disadvantages base paper presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2015 2016. Their need arises from miniaturization of various devices in science and engineering calling for ultra precision manufacturing and micro fabrication. Micro machining machining of micro parts is not literally correct. Powder metallurgy and micromachining notes 1.
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