MAE T 203
Introduction to Powder Metallurgy (3) A comprehensive study of powdered metal technology including production, characterization, compaction, sintering, and finishing operations.
MAE T 203 Introduction to Powder Metallurgy (3)
This course is comprehensive study of powdered metal technology for two year associate degree students. The objective is for students to gain familiarity with fundamental concepts associated with powdered metal (P/M) technology. Topics include powder sampling, powder characterization, test methods/techniques, compaction, sintering, finishing operations, and powder fabrication.
This course starts with a brief introduction to powder metallurgy that covers the historical development and industrial need for P/M engineered components. The first major topic is powders. Different ways to obtain a representative sample of powder from a large storage container are discussed. Powder characteristics such as average particle size, particle shape, flow ability, and particle size distribution are covered in some detail. Other important properties of loose powder covered include apparent (Hall) density, Arnold density, and tap density. The student is introduced to standard procedures used in powder testing as described by the Metal Powder Industries Federation (MPIF). The next major topic is powder compaction. This starts with a short description of the different types of presses used in classical "die press and sinter" P/M processing. Different types of die press set ups are reviewed along with compaction tooling requirements. Compressibility of loose powder is discussed with an emphasis on the factors for predicting, both qualitatively and quantitatively, that influence the green density of powder compacts. The effect of lubricants on compressibility is included here. A milestone topic in this course is on sintering theory. Material transport mechanisms that may occur during sintering and their effects of densification are presented from a theoretical viewpoint. Variables that influence densification during sintering are emphasized. Liquid phase sintering and activated sintering are included. Practical examples and microstructures of sintered engineering materials are presented. Sintering furnaces are discussed with the comparative advantages and disadvantages of different types of sintering atmospheres used. The effect of the sintering atmosphere on the composition, microstructure and mechanical properties of powder compacts is discussed. The next topic is finishing operations that are used to modify components after they have been sintered. This includes operations like refinishing, sizing, coining, steam oxidation, tumbling, and machining. The last topic covered in this course is powder fabrication. Four basic methods of producing metal powders are discussed: mechanical fabrication, electrolytic fabrication, chemical fabrication, and atomization. Typical examples of the resulting powders are given along with how fabrication method affects the size, shape, microstructure, chemistry and cost of the powder.
Note : Class size, frequency of offering, and evaluation methods will vary by location and instructor. For these details check the specific course syllabus.