Effect of Aluminum Content on Tribological Behavior of a Cu-Fe-C Based Friction Material Sliding against FC30 Cast Iron

Abstract

An experimental study was made on the effect of aluminum content on the tribological behavior of a Cu-Fe-C based friction material sliding against FC30 cast iron. As a result, the densities of all Cu-Fe-C materials decreased after sintering. In general, when Al content increased, the density decreased. Sintered 65.5mass%Cu-11.4mass%Fe-6.6mass%C based friction material (A0) had much lower hardness than 57.7mass%Cu-12.6mass%Fe-7.3mass%C and 48.1mass%Cu-14.0mass%Fe-8.0mass%C based friction materials (A10 and A20). During sintering in air, large amounts of oxides formed. The presence of Al caused Cu-Sn to decompose, Al-Cu and Fe-Sn phases to form, Cu to be oxidized, and Fe 2 O 3 to be reduced. A10 demonstrated the highest and most stable friction coefficient, as well as the smallest weight loss among three materials. Both film type and particulate type debris morphologies were observed on worn surfaces of Cu-Fe-C specimens. Local delamination of debris film was frequently observed on A0 and A20 surfaces, but seldom observed on A10 surface. Significant amounts of iron transfers from FC30 to A10 and A20 during sliding, but less such transfer occurred in A0.

The Influence of the Technological Process on the Surface Quality and Tribological Properties of Powder Details

“…For investigation the following powder mixture (from powders produced by "Höganäs AB", Sweden) was used (mass %): Fe 96.5%, Ni 0.22%, Cu 2.27%, Mo 0.28%, S 0.04%, P 0.01%, С 0.6%, Kennolube (graphite lubricant) 0.7%. The main properties of offered low-alloy metal powder material are the following: apparent density 3.15 g/cm 3 ; flow 40 sec/50g; compressibility 6.80 g/cm 3 . Powder parts (Fig.…”

“…), with the role of increasing material resistance to gripping and for wear reduction of disc (rotor) brake [2]. Iron and copper have been used extensively for various tribological applications [1] - [3]. The copper and iron-based antifriction materials are most often fabricated using PM technique due to its many advantages such as the elimination of solidification induced chemical segregation and structural defects often accompanied with melting and solidification processes.…”

“…The copper and iron-based antifriction materials are most often fabricated using PM technique due to its many advantages such as the elimination of solidification induced chemical segregation and structural defects often accompanied with melting and solidification processes. The ease in mixing of different powders leads to the possibility for developing new composite materials with special physical and mechanical properties that are otherwise difficult to manufacture [3].…”

The Effect of Copper Addition on the Mechanical and Wear Properties of Grey Cast Iron

“…Before the final weight was taken, the surface of the coupon under test was cleaned with the white cotton wool soaked in acetone. The surface of the sample was placed against a 200 mm diameter surface 120 µm mesh emery paper mounted on the pin on disc, rotating at a speed of 2.36 m·s −1 under an applied load of 10 N for 60 s. The same procedure was repeated on the same sample for four times keeping the parameters constant and volume loss was calculated in each case using Equation (1).…”

“…Copper and its alloy are among the most versatile engineering materials. However, copper has found been in use both as parent metal and alloy elements in the development of alloy materials for various engineering applications [1] [2].…”