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powder particle morphology

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Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006089
EISBN: 978-1-62708-175-7
... for the process. It discusses the changes in powder particle morphology that occur during milling of metal powders produced by various processes such as microforging, fracturing, agglomeration, and deagglomeration. The article also provides useful information on milling equipment such as tumbler ball mills...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005731
EISBN: 978-1-62708-171-9
... Powder size and size distribution determination methods used for thermal spray powders include: Sieving Electrical resistance Sedimentation Centrifugation Image analysis Light scattering Of the various methods available to determine particle size, sieving still...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006065
EISBN: 978-1-62708-175-7
...Abstract Abstract This article discusses the production of aluminum and aluminum alloy powders with emphasis on the gas atomization method and the atomizing nozzle. It illustrates the particle formation mechanism and details the requisites for particle size distribution, control, and morphology...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006571
EISBN: 978-1-62708-290-7
...-cured alkaline phenolic Resole/acid-cured phenolic Resole/inorganic Furan/phenolic Modified furan Sand feedstock particle size, μm 280–500 140/190/250 200 Source: Ref 40 – 42 Fig. 7 Liquid permeation into powder bed with irregular particle morphology. (a) Schematic of large void...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006567
EISBN: 978-1-62708-290-7
... processes. In powder-bed fusion, irregular powder morphologies often preclude the use of water-atomized powder due to issues with nonuniform spreading during the recoating process. In directed-energy deposition, irregular particles are known to clog the powder feed nozzles, creating a sputtering effect...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006058
EISBN: 978-1-62708-175-7
... ). High-speed pulverization coupled with low temperature due to adiabatic gas cooling activates secondary and tertiary (nonbasal) cleavage systems. Powder particle morphology is improved compared with the flake shape, resulting in a blocky shape ( Fig. 5 ). Substantially less correlation between...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006109
EISBN: 978-1-62708-175-7
... density chemical composition cohesive strength compressibility flow rate frictional properties green strength metal powders particle morphology powder segregation rectangular test bar springback tap density POWDER METALLURGY (PM), metal injection molding, and additive manufacturing have...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006042
EISBN: 978-1-62708-175-7
... the production of highly alloyed tool-steel and superalloy powders. Due to the rapid solidification rates inherent in the atomization process, this technique avoided the segregation issues common to alloys in the as-cast state. The near-spherical morphology of the powder particles made conventional die...
Book Chapter

By Bo Hu
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006102
EISBN: 978-1-62708-175-7
... of powder particles is important to the manufacturing of PM components. Unlike other particle analysis methods, particle image analysis can directly provide visual information about particle size, shape, and morphologies used to describe powder. These parameters affect not only the quality of powder mixes...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006649
EISBN: 978-1-62708-213-6
...) are then ground into the required particle size, so that the final milling techniques often determine the particle morphology and powder quality that relate to certain specific performances. For example, one of the electrolytic iron powders is produced into layered solid particles with a flake shape. Carbonyl...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006100
EISBN: 978-1-62708-175-7
... coefficients of friction may be achieved. Unlike copper powder, which is normally used in a nonporous (pore-free) form, iron powder is normally used in a porous form called sponge iron powder. A porous structure with an irregular particle morphology and therefore a low apparent density is a key...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005727
EISBN: 978-1-62708-171-9
..., it should be noted that there is a possibility of electrodeposition of metal powders with controlled grain size, morphology, and crystal structure of the particles by employing electrodeposition methods at a periodically changing rate. The electrolytic powder production method usually yields products...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006097
EISBN: 978-1-62708-175-7
... process can be tailored to produce powders with appreciable variations in particle morphology, which are primarily indicated by differences in their apparent densities. For example, powders intended for the manufacture of PM filters can have a highly irregular morphology, with a low apparent density (AD...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003358
EISBN: 978-1-62708-195-5
... … … Good for wear resistance and armor applications … FEPA, Federation of the European Producers of Abrasives Fig. 1 Variation in particle size distribution and morphology as a function of grit size for F1500, F1200, F600, and F360 grit SiC powders Fig. 2 Effect of microstructure...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005719
EISBN: 978-1-62708-171-9
... in measuring individual and collective particle velocities, temperature, and trajectories as well as other plume characteristics for the plasma spray process. particle morphology powder feeder process control equipment thermal spray equipment thermal spray plume sensors SUPPORT EQUIPMENT...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006122
EISBN: 978-1-62708-175-7
... in a range of 5 to 500 microns. Screening or air classification is utilized to provide the appropriate particle size distribution (PSD) depending on application; see Fig. 8 . Fig. 7 Flow diagram of water atomization process Fig. 8 Morphology of water atomized powder High-pressure...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006121
EISBN: 978-1-62708-175-7
... and excessive agglomeration of particles ( Ref 22 ). The second-stage reduction of MoO 2 to molybdenum is endothermic and MoO 2 is less volatile than MoO 3 . Control of the morphology of MoO 2 is important in order to obtain molybdenum powder with good sintering properties ( Ref 23 , 24 , 25...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003724
EISBN: 978-1-62708-177-1
...Abstract Abstract This article provides information on four different length scales at which surface morphology can be viewed: macro, meso, micro and nanoscale. Elementary thermodynamics demonstrates that a liquid cannot solidify unless some undercooling below the equilibrium (melting...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006568
EISBN: 978-1-62708-290-7
.... The following presents a few flow tests in common use. Flowability and spreadability are affected by the characteristics of the powder feedstock, such as particle size distribution, powder morphology, and surface chemistry, as well as external variables, such as humidity, triboelectric charge buildup...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006583
EISBN: 978-1-62708-290-7
... the powder manufacturing standpoint, this is an important distinction, given that the molybdenum, tungsten, and WC powders produced conventionally are not spherical. Table 2 provides a guideline for the required powder morphology and size. Required powder morphology and size for various additive...