# Help Solve 90-10 Bronze Problem: Melting, Solidification, Separation

• dcfan
In summary, the 90-10 bronze problem is caused by the significant difference in melting points between copper and tin, resulting in an uneven distribution of components during the melting and solidification process. This can affect the properties of the bronze alloy, including its strength and corrosion resistance. Methods such as alloying with other elements, using fluxes, and specialized casting techniques can help solve this problem, but there may be potential drawbacks such as increased production costs. However, the benefits of achieving a homogenous alloy make it a worthwhile pursuit.
dcfan
Hello,

I have difficulties solving a simple problem and would need some help to solve it. Thx very much in advance for your help, very appreciated ! :)
Here is the problem:

A kilogram of a 90-10 bronze contains 900g copper (100g Sn). Suggest a procedure for obtaining from this bronze at least 100 g copper that will have an analysis of <2 percent tin. Use melting, partial solidification, and separation steps. (Assumes that the liquidus and solidus are straight lines.)

Bronze:

[PLAIN]http://img259.imageshack.us/img259/9738/562cusn.jpg

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No ideas someone??

## 1. What is the 90-10 bronze problem?

The 90-10 bronze problem refers to the difficulty in achieving a homogenous mixture during the melting and solidification process of bronze alloy containing 90% copper and 10% tin. The two metals have different melting points and do not mix easily, resulting in potential separation and uneven distribution of the alloy's components.

## 2. Why does the 90-10 bronze alloy have this problem?

The 90-10 bronze alloy has this problem due to the significant difference in melting points between copper and tin. Copper has a higher melting point (1084.62°C) compared to tin (231.93°C), making it more difficult for the two metals to mix and form a homogenous alloy during the melting process.

## 3. How does the separation of copper and tin affect the properties of the bronze alloy?

The separation of copper and tin during the melting and solidification process can result in an uneven distribution of the components, leading to variations in the mechanical, chemical, and physical properties of the bronze alloy. This can affect its strength, ductility, and corrosion resistance, among other properties.

## 4. What methods can be used to solve the 90-10 bronze problem?

Several methods can be used to help solve the 90-10 bronze problem, including alloying with other elements, using fluxes to facilitate mixing, controlling the temperature and cooling rate during solidification, and employing specialized casting techniques such as centrifugal or pressure casting.

## 5. Are there any potential drawbacks to solving the 90-10 bronze problem?

While there may be potential drawbacks to solving the 90-10 bronze problem, such as increased production costs and using more complex techniques, the benefits of achieving a homogenous alloy with consistent properties make it worth pursuing. Additionally, advancements in technology and research may lead to more efficient and cost-effective solutions in the future.

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