Copper Alloys - Early Applns., Curr. Perf. Enhancing by L. Collini

By L. Collini

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Wrought manganese brasses with 58 % of Cu or 57 % of Cu with addition of Al have quite good strength (in medium-hard state 400 to 500 MPa) at large toughness and corrosion resistance. They are used for armatures, valve seating, high-pressured tubes, etc. Mn brass with 58 % of Cu is also used for decorations (product surface is layered during hot oxidation process by attractive, durable brown verdigris). Cast manganese brasses have larger manganese and iron content and they are used for very hard loaded castings; weapons parts, screw propellers, turbine blades and armatures for the highest pressures.

2 Gas evolution permeation technique A schematic view of a permeation facility is shown in Figure 2. The physical principle of the experimental technique entails the gas flux recording that passes through a thin membrane of the material of interest from a high gas pressure region to a low-pressure region at initial vacuum conditions. 33 Pa respectively. An electrical resistance furnace (F) regulated by a PID controller allows to establish the sample temperature within a +/- 1 K precision. The temperature of the specimen is measured by a Ni-Cr/Ni thermocouple inserted into a well drilled in one of the two flanges where the specimen is mounted.

Cast manganese brasses have larger manganese and iron content and they are used for very hard loaded castings; weapons parts, screw propellers, turbine blades and armatures for the highest pressures. Tin brasses. 5 %. Tin has a positive influence on mechanical properties and corrosion resistance. Some Sn alloys with 60 % of Cu have good acoustical properties and so they are used for the musical/sound instruments production. Sn brass alloy with 62 % of Cu is used for the strips, metal sheets and profiles used in the ships or boat constructions.

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