Hot pressing of materials of high graphite content

1971 ◽  
Vol 10 (2) ◽  
pp. 113-114
Author(s):  
A. G. Yurchenko ◽  
L. I. Pugina ◽  
M. S. Koval'chenko
Keyword(s):  
Hot Pressing ◽  
Graphite Content ◽  
High Graphite

Effect of Graphite on the Friction and Wear Properties of Cu-Based Friction Materials

2014 ◽  
Vol 788 ◽  
pp. 621-626 ◽  
Author(s):  
Jing Dan Wei ◽  
Hua Chen
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Friction And Wear ◽  
Wear Properties ◽  
Friction Materials ◽  
Graphite Content ◽  
Lubricating Film ◽  
Properties Of Materials ◽  
Friction And Wear Properties ◽  
High Graphite

Cu-based friction materials were prepared by powder metallurgy technology. The effect of the graphite on friction and wear properties of materials was investigated. The experimental results indicate that the wear rate of the materials increased with increasing speed. The wear rate of the materials with the graphite with the size of 300~600μm decreased with increasing graphite content, indicating that the graphite size of 300~600μm showed the good lubricating effect. The lubricating film made the friction coefficient decrease. The wear resistance of materials with 100~300μm graphite was degraded at high graphite content, and the graphite size of 100~300μm has bad effect on the strength of materials. The wear debris made the friction coefficient slightly increase with the increase of graphite content. The material with the graphite content of 10% and the graphite size of 300~600μm has the best friction and wear properties.

Seebeck Effect in Graphite-Carbon Fiber Cement Based Composite

2010 ◽  
Vol 177 ◽  
pp. 566-569 ◽  
Author(s):  
Hai Yong Cao ◽  
Wu Yao ◽  
Jun Jie Qin
Keyword(s):  
Carbon Fiber ◽  
Seebeck Coefficient ◽  
Thermoelectric Power ◽  
Seebeck Effect ◽  
Graphite Content ◽  
Cement Based Materials ◽  
Electron Contribution ◽  
Reinforced Cement ◽  
P Type ◽  
High Graphite

The Seebeck effect in carbon fiber reinforced cement-based composite (CFRC) is of interest because it enables the cement-based materials to sense its own temperature without attached or embedded sensor. In this study, the Seebeck coefficient of CFRC and graphite-carbon fiber cement based composite were measured. Results show that the addition of graphite can enhance the Seebeck effect of CFRC. When graphite content is 10wt. %, all types of CFRC show P-type because the hole contribution from carbon fiber dominates the Seebeck effect. When the graphite content is 20wt. %, the change of thermoelectric power (TEP) from positive to negative occurs with the increasing of graphite to carbon fiber ratio (≥25). This phenomenon indicates that compensation takes place between electron contribution from graphite and hole contribution from carbon fiber. At a high graphite content (30wt. %), CFRC shows N-type above a certain temperature difference (20-25°C) since the electrons from graphite dominate the Seebeck effect.

Metal-graphite materials of high graphite content and some methods of their preparation

1976 ◽  
Vol 15 (1) ◽  
pp. 27-29
Author(s):  
D. S. Yas' ◽  
V. I. Pavlenko ◽  
V. B. Podmokov
Keyword(s):  
Graphite Content ◽  
High Graphite

scholarly journals Wear Behavior of Copper–Graphite Composites Processed by Field-Assisted Hot Pressing

2019 ◽  
Vol 3 (1) ◽  
pp. 29 ◽  
Author(s):  
Qian Liu ◽  
Miguel Castillo-Rodríguez ◽  
Antonio Galisteo ◽  
Roberto Guzmán de Villoria ◽  
José Torralba
Keyword(s):  
Friction Coefficient ◽  
Wear Mechanism ◽  
Hot Pressing ◽  
Normal Load ◽  
Pure Copper ◽  
Wear Testing ◽  
Critical Threshold ◽  
Graphite Composite ◽  
Graphite Content ◽  
Graphite Composites

Copper–graphite composites with 0–4 wt % graphite were fabricated by field-assisted hot pressing with the aim of studying the effect of graphite content on microhardness and tribological properties. Experimental results reveal that hardness decreases with the graphite content. Wear testing was carried out using a ball-on-disc tribometer with a normal load of 8 N at a constant sliding velocity of 0.16 m/s. The friction coefficient of composites decreases significantly from 0.92 to 0.29 with the increase in graphite content, resulting in a friction coefficient for the 4 wt % graphite composite that is 68.5% lower than pure copper. The wear rate first increases when the graphite content is 1 wt %; it then decreases as the graphite content is further increased until a certain critical threshold concentration of graphite, which seems to be around 3 wt %. Plastic deformation in conjunction with some oxidative wear is the wear mechanism observed in pure copper, while abrasive wear is the main wear mechanism in copper–graphite composites.

Microstructure of mechanically alloyed and hot-pressed Al5CuZr2

1990 ◽  
Vol 48 (4) ◽  
pp. 970-971
Author(s):  
T. E. Mitchell ◽  
P. B. Desch ◽  
R. B. Schwarz
Keyword(s):  
Mechanical Alloying ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Rapid Quenching ◽  
Hardened Steel ◽  
Alloyed Powder ◽  
Ion Milling ◽  
Mechanical Grinding ◽  
Mechanically Alloyed ◽  
Steel Container

Al3Zr has the highest melting temperature (1580°C) among the tri-aluminide intermetal1ics. When prepared by casting, Al3Zr forms in the tetragonal DO23 structure but by rapid quenching or by mechanical alloying (MA) it can also be prepared in the metastable cubic L12 structure. The L12 structure can be stabilized to at least 1300°C by the addition of copper and other elements. We report a TEM study of the microstructure of bulk Al5CuZr2 prepared by hot pressing mechanically alloyed powder.MA was performed in a Spex 800 mixer using a hardened steel container and balls and adding hexane as a surfactant. Between 1.4 and 2.4 wt.% of the hexane decomposed during MA and was incorporated into the alloy. The mechanically alloyed powders were degassed in vacuum at 900°C. They were compacted in a ram press at 900°C into fully dense samples having Vickers hardness of 1025. TEM specimens were prepared by mechanical grinding followed by ion milling at 120 K. TEM was performed on a Philips CM30 at 300kV.

Effect of hot pressing on the modulated structure of Zr0.98Sn0.02TiO4

1998 ◽  
Vol 77 (4) ◽  
pp. 1033-1037 ◽  
Author(s):  
Y. Park, S. A. Song H., G. Kim
Keyword(s):  
Hot Pressing ◽  
Modulated Structure

Wear Characteristics of Circular cBN/Diamond Saws Produced by Hot Pressing

2014 ◽  
Vol 56 (3) ◽  
pp. 213-217 ◽  
Author(s):  
Serkan Islak ◽  
Durmuş Kır ◽  
Halis Çelik
Keyword(s):  
Hot Pressing ◽  
Wear Characteristics
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