Wear Resistance - Brass or Bronze is better?

[wwong7]

Comparing Brass & Bronze, which one is generally better in term of wear resistance? and which one is generally harder than the other?

Beside Brass & Bronze, which other material is superior in term of wear resistance? And scale for wear resistance comparison?

Thanks.

 

[swall]

My personal preference is aluminum bronze. But what is the type of component you are looking at and what is the operating environment?

 

[EdStainless]

It really depends on the application. The environment and the mating surface will drive your selection.

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[consultmet]

Hello WWong7:

I have a few comments regarding Aluminum Bronzes vs. Manganese Bronzes based on a recent study here at our laboratory:

1 As- cast and annealed Aluminum Bronze’s have tensile properties (yield and UTS) and hardness less than manganese bronzes.

2 In service, manganese bronzes have a limit of 450 F due to hot shortness (brittleness), aluminum bronzes can be used at temperatures as high as 750 F for short periods of time without appreciable loss of strength.

3 Aluminum Bronzes tensile properties are relatively low and the ductility is high when in the as-cast or annealed condition compared to Manganese Bronzes. However Aluminum bronzes containing 9.5-11.5 percent Aluminum may be heat treated, a quench and temper heat treatment, Increases the strength and hardness. For example, yield strength from 30 to 45 ksi, ultimate tensile strength from 75 to 90 ksi with a decrease in elongation from 12% to 10%.

So Manganese Bronzes have higher tensile properties and hardness than aluminum bronzes in the as cast or annealed condition. Manganese Bronzes properties are completive to the heat treated Aluminum Bronzes; However we found that Heat treated Aluminum Bronzes has considerable greater fatigue life.

Now concerning the wear resistance? Unfortunately wear is the second phase of this program and we not at a point to discuss this.

I hope this information is of some help.

 

[Tmoose]

Some of the stronger bronzes need full hydrodynamic lubrication, lest they gall and seize .

The heavily leaded bronzes survive much better when lubrication is marginal, if speeds are slow enough.

The opposing material and finish can make a big difference.

Poor geometry usually can not be compensated for with "better" materials.

What is the problem you need to fix?