Nickel aluminum bronze (C63000)
Nickel aluminum bronze is a modern example of a bronze alloy. One standard composition of this material is 10% aluminum, 5% nickel, 3% iron and 82% copper by weight. Sometimes other elements like manganese and silicon are also added. The nickel serves to increase the corrosion resistance as well as wear resistance. Where the iron increases the tensile strength by reducing the formation of the brittle ‘gamma phase’ of material that can form upon slow cooling
This is an extremely strong and corrosion resistant alloy, it finds use in marine environments in the form of propellers and other hardware that is in constant contact with sea water.
This material can also be heat treated in a very similar way to steel, and can reach hardnesses of 30-35HRC which for a bronze is very very impressive, despite being much softer than steel.
Shibuichi
Shibuichi is a Japanese alloy primarily made of copper with varying amounts of silver. Its name translates to "four parts," indicating the traditional ratio of one part silver to three parts copper. However, shibuichi can encompass a range of compositions, each with distinct properties:
- Standard Shibuichi (75% Copper, 25% Silver): This blend results in a material that exhibits a muted, grayish-silver color. It is valued for its aesthetic appeal, as its color can be patinated or oxidized to create various shades and patterns, adding depth and character to the metal.
- Variations with Higher Silver Content: When the silver content is increased, say to a 50-50 ratio or higher, the resulting shibuichi exhibits a more pronounced silver color. Higher silver content can affect the metal's workability, making it softer and potentially more prone to tarnishing but also enhancing its ability to take on various patinas and surface treatments.
- Variations with Lower Silver Content: Conversely, reducing the silver content below the traditional ratio results in a material that leans more towards the coppery side in terms of color. It may have a reddish or bronze-like hue. Lower silver content might render the alloy less reactive to patinas and surface treatments but could improve its durability and hardness.
- In essence, the variation in silver content within shibuichi alters its color, workability, and reactivity to patination techniques. Artists and craftsmen often select the specific composition of shibuichi based on the desired visual effects and the practical characteristics required for their intended creations.
Calculator Created by: Jacob Christian - Besslen Bladeworks
Alloys by: Mike Pommer - Mikes Metalworking