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Ch17 metal powders Erdi Karaçal Mechanical Engineer University of Gaziantep
1.
Chapter 17 Processing
of Metal Powders Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
2.
Parts Made by
Powder-Metallurgy (a) (b) Figure 17.1 (a) Examples of typical parts made by powder-metallurgy processes. (b) Upper trip lever for a commercial sprinkler made by P/M. This part is made of an unleaded brass alloy; it replaces a die-cast part with a 60% savings. (c) Main-bearing metal-powder caps for 3.8 and 3.1 liter General Motors automotive engines. Source: (a) and (b) Reproduced with permission from Success Stories on P/M Parts, 1998. Metal Powder Industries Federation, Princeton, New Jersey, 1998. (c) Courtesy of Zenith Sintered Products, Inc., Milwaukee, Wisconsin. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. (c)
3.
Steps in Making
Powder-Metallurgy Parts Figure 17.2 Outline of processes and operations involved in making powder-metallurgy parts. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
4.
Particle Shapes in
Metal Powders Figure 17.3 Particle shapes in metal powders, and the processes by which they are produced. Iron powders are produced by many of these processes. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
5.
Powder Particles (a)
(b) Figure 17.4 (a) Scanning-electron-microscopy photograph of iron-powder particles made by atomization. (b) Nickel-based superalloy (Udimet 700) powder particles made by the rotating electrode process; see Fig 17.5c. Source: Courtesy of P.G. Nash, Illinois Institute of Technology, Chicago. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
6.
Manufacturing, Engineering &
Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. Methods of Metal-Powder Production by Atomization Figure 17.5 Methods of metal-powder production by atomization: (a) gas atomization; (b) water atomization; (c) atomization with a rotating consumable electrode; and (d) centrifugal atomization with a spinning disk or cup.
7.
Mechanical Comminution to
Obtain Fine Particles Figure 17.6 Methods of mechanical comminution to obtain fine particles: (a) roll crushing, (b) ball mill, and (c) hammer milling. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
8.
Mechanical Alloying Figure
17.7 Mechanical alloying of nickel particles with dispersed smaller particles. As nickel particles are flattened between the two balls, the second smaller phase is impresses into the nickel surface and eventually is dispersed throughout the particle due to successive flattening, fracture, and welding events. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
9.
Bowl Geometries in
Blending Metal Powders Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. (e) Figure 17.8 (a) through (d) Some common bowl geometries for mixing or blending powders. (e) A mixer suitable for blending metal powders. Since metal powders are abrasive, mixers rely on the rotation or tumbling of enclosed geometries as opposed to using aggressive agitators. Source: Courtesy of Gardner Mixers, Inc.
10.
Compaction Figure 17.9
(a) Compaction of metal powder to form a bushing. The pressed-powder part is called green compact. (b) Typical tool and die set for compacting a spur gear. Source: Courtesy of Metal Powder Industries Federation. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
11.
Density as a
Function of Pressure and the Effects of Density on Other Properties Figure 17.10 (a) Density of copper- and iron-powder compacts as a function of compacting pressure. Density greatly influences the mechanical and physical properties of P/M parts. (b) Effect of density on tensile strength, elongation, and electrical conductivity of copper powder. Source: (a) After F. V. Lenel, (b) IACS: International Annealed Copper Standard (for electrical conductivity). Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
12.
Density Variation in
Compacting Metal Powders Figure 17.11 Density variation in compacting metal powders in various dies: (a) and (c) single-action press; (b) and (d) double-action press. Note in (d) the greater uniformity of density from pressing with two punches with separate movements when compared with (c). (e) Pressure contours in compacted copper powder in a single-action press. Source: After P. Duwez and L. Zwell. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
13.
Compacting Pressures for
Various Powders Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
14.
Manufacturing, Engineering &
Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. Press for Compacting Metal Powder Figure 17.12 A 7.3-mn (825-ton) mechanical press for compacting metal powder. Source: Courtesy of Cincinnati Incorporated.
15.
Cold Isostatic Pressing
Figure 17.13 Schematic diagram of cold isostatic pressing, as applied to forming a tube. The powder is enclosed in a flexible container around a solid-core rod. Pressure is applied isostatically to the assembly inside a high-pressure chamber. Source: Reprinted with permission from R. M. German, Powder Metallurgy Science, Metal Powder Industries Federation, Princeton, NJ; 1984. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
16.
Capabilities Available from
P/M Operations Figure 17.14 Capabilities, with respect to part size and shape complexity, available form various P/M operations. P/F means powder forging. Source: Courtesy of Metal Powder Industries Federation. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
17.
Hot Isostatic Pressing
Figure 17.15 Schematic illustration of hot isostatic pressing. The pressure and temperature variation versus time are shown in the diagram. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
18.
Valve Lifter for
Diesel Engines Figure 17.16 A valve lifter for heavy-duty diesel engines produced form a hot-isostatic- pressed carbide cap on a steel shaft. Source: Courtesy of Metal Powder Industries Federation. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
19.
Powder Rolling Figure
17.17 Schematic illustration of powder rolling. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
20.
Spray Deposition Figure
17.18 Spray deposition (Osprey Process) in which molten metal is sprayed over a rotating mandrel to produce seamless tubing and pipe. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
21.
Sintering Time and
Temperature for Metals Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
22.
Mechanisms for Sintering
Metal Powders Figure 17.19 Schematic illustration of two mechanisms for sintering metal powders: (a) solid-state material transport; and (b) vapor-phase material transport. R = particle radius, r = neck radius, and p = neck-profile radius. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
23.
Mechanical Properties of
P/M Materials Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
24.
Comparison of Properties
of Wrought and Equivalent P/M Metals Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
25.
Mechanical Property Comparisons
for Titanium Alloy Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
26.
Design Considerations for
P/M • The shape of the compact must be kept as simple and uniform as possible. • Provision must be made for ejection of the green compact without damaging the compact. • P/M parts should be made with the widest acceptable tolerances to maximize tool life. • Part walls should not be less than 1.5 mm thick; thinner walls can be achieved on small parts; walls with length-to-thickness ratios above 8:1 are difficult to press. • Steps in parts can be produced if they are simple and their size doesn’t exceed 15% of the overall part length. • Letters can be pressed if oriented perpendicular to the pressing direction. Raised letters are more susceptible to damage in the green stage and prevent stacking. • Flanges or overhangs can be produced by a step in the die. • A true radius cannot be pressed; instead use a chamfer. • Dimensional tolerances are on the order of ±0.05 to 0.1 mm. Tolerances improve significantly with additional operations such as sizing, machining and grinding. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
27.
Die Design for
Powder-Metal Compaction Figure 17.20 Die geometry and design features for powder-metal compaction. Source: Courtesy of Metal-Powder Industries Federation Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
28.
Poor and Good
Designs of P/M Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. Parts Figure 17.21 Examples of P/M parts showing poor and good designs. Note that sharp radii and reentry corners should be avoided and that threads and transverse holes have to be produced separately by additional machining operations. Source: Courtesy of Metal Powder Industries Federation.
29.
Design Features for
Use with Unsupported Flanges or Grooves Figure 17.22 (a) Design features for use with unsupported flanges. (b) Design features for use with grooves. Source: Courtesy of Metal Powder Industries Federation. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
30.
Use of Smooth
Transitions in Molds Figure 17.23 The use of smooth transitions in molds for powder-injection molding to ensure uniform metal-powder distribution throughout a part. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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