scholarly journals Machinable Cu-40Zn Composites Containing Graphite Particles by Powder Metallurgy Process

2009 ◽  
Vol 2009 ◽  
pp. 1-4 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Hisashi Imai ◽  
Yoshiharu Kosaka ◽  
Akimichi Kojima ◽  
Junko Umeda
Keyword(s):  
Tensile Strength ◽  
Powder Metallurgy ◽  
Hot Extrusion ◽  
Graphite Powder ◽  
Environmentally Benign ◽  
High Tensile Strength ◽  
Graphite Particles ◽  
Powder Metallurgy Process ◽  
Metallurgy Process ◽  
Zn Alloys

Advanced Cu-40mass%Zn alloys with a high tensile strength and excellent machinability have been developed via a powder metallurgy (P/M) process. They are environmentally benign because fine graphite particles are included instead of lead (Pb) to improve their machinability. The effect of the content and particle size of the graphite on the mechanical properties and machinability are investigated in this paper. When applying a conventional P/M process consisting of the cold compaction and hot extrusion to consolidate elementally premixed mixture of Cu-40mass%Zn and graphite powder, the addition of 1 mass% graphite particles with  m in diameter is suitable to obtain a high tensile strength and good machinability at the same time.

GRAPHITE REINFORCED Fe–Al–X COMPOSITES FOR SLIDE BEARING APPLICATIONS

2010 ◽  
Vol 17 (02) ◽  
pp. 241-244
Author(s):  
SE-HYUN KO ◽  
WONSIK LEE ◽  
JIN MAN JANG ◽  
IL-HO KIM ◽  
SEONG-GUN SHIN
Keyword(s):  
Wear Resistance ◽  
Powder Metallurgy ◽  
High Hardness ◽  
Dimensional Change ◽  
Low Density ◽  
Graphite Particles ◽  
Slide Bearing ◽  
Liquid Phases ◽  
Powder Metallurgy Process ◽  
Metallurgy Process

The Fe–Al–X(Cu, Ni, Ti) composites reinforced with graphite particles were fabricated employing the powder metallurgy process for slide bearing applications. In all samples, graphite particles of 6 wt.% were added. Elemental powders were mixed to specific compositions with a powder lubricant, and then the mixed powders were compacted at 500 MPa. The green compacts were heated to 450°C to remove the lubricant and sintered at 1200°C for 1 h. The sintering was conducted in vacuum. The sintering of binary Fe–Al –graphite system showed low density and growth in dimension. Complex addition of Cu , Ni and Ti improved the sinterability of green compacts due to occurrence of partial liquid phases. Hardness of sintered samples strongly depended on dimensional change during sintering. The samples of high hardness showed better wear resistance properties.

scholarly journals Development of Lead-Free Machinable Brass with Bismuth and Graphite Particles by Powder Metallurgy Process

2010 ◽  
Vol 51 (5) ◽  
pp. 855-859 ◽  
Author(s):  
Hisashi Imai ◽  
Li Shufeng ◽  
Haruhiko Atsumi ◽  
Yoshiharu Kosaka ◽  
Akimichi Kojima ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Lead Free ◽  
Graphite Particles ◽  
Powder Metallurgy Process ◽  
Metallurgy Process

A Novel Process for Joining Ti Alloy and Al Alloy using Two-Stage Sintering Powder Metallurgy

2018 ◽  
Vol 37 (5) ◽  
pp. 437-444
Author(s):  
Luping Long ◽  
Wensheng Liu ◽  
Yunzhu Ma ◽  
Lei Wu ◽  
Chao Liu
Keyword(s):  
Tensile Strength ◽  
Powder Metallurgy ◽  
Diffusion Bonding ◽  
Al Alloy ◽  
Ti Alloy ◽  
Two Stage ◽  
Bonding Quality ◽  
Powder Metallurgy Process ◽  
Brittle Fractures ◽  
Metallurgy Process

AbstractThe major challenges for conventional diffusion bonding of joining Ti alloy and Al alloy are the undesirable interfacial reaction, low matrixes and joint strength. To avoid the problem in diffusion bonding, a novel two-stage sintering powder metallurgy process is developed. In the present work, the interface characterization and joint performance of the bonds obtained by powder metallurgy bonding are investigated and are compared with the diffusion bonded Ti/Al joints obtained with the same and the optimized process parameters. The results show that no intermetallic compound is visible in the Ti/Al joint obtained by powder metallurgy bonding, while a new layer formed at the joint diffusion bonded with the same parameters. The maximum tensile strength of joint obtained by diffusion bonding is 58 MPa, while a higher tensile strength reaching 111 MPa for a bond made by powder metallurgy bonding. Brittle fractures occur at all the bonds. It is shown that the powder metallurgy bonding of Ti/Al is better than diffusion bonding. The results of this study should benefit the bonding quality.

scholarly journals Kinetic Analysis of Solid-State Formation of Mg2Si by Powder Metallurgy Process

2011 ◽  
Vol 37 (6) ◽  
pp. 321-325
Author(s):  
Bin SUN ◽  
Shufeng LI ◽  
Hisashi IMAI ◽  
Junko UMEDA ◽  
Katsuyoshi KONDOH
Keyword(s):  
Powder Metallurgy ◽  
Solid State ◽  
Kinetic Analysis ◽  
State Formation ◽  
Powder Metallurgy Process ◽  
Metallurgy Process
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