titanium sponge etc 3

[ultramat]

Hi,

What is the difference between powder and sponge?
Thank you.

 

[CoryPad]

Powder is composed of divided, small crystals.

Sponge is a porous, monolithic solid that may or may not be polycrystalline.

 

[cloa]

Maybe he means what's the difference in composition between Titanium powder and Titanium sponge? Surely that depends on the standard each is made to.

 

[EdStainless]

If you are worried about composition then sponge will usually be less pure, it will contain some Cl and maybe other stuff.
Powder is usually a better grade of product.

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[ultramat]

I am asking about a sponge for the production of a metal alloy.

Does anyone know how the difference (mainly the porosity) affects the final product after sintering?

Thank you.

 

[lgearhart]

Sponge isn't really 'sintered'. It's mixed with the alloying elements needed to get to the final desired composition, then pressed into an ingot, and then remelted. P/M titanium products, at least the ones I'm familiar with, are made from prealloyed powder, and are then sintered and hipped, possibly at the same time. Porosity is primarily a function of the sintering and hipping parameters, not so much the powder size and shape, although of course they play a role. And then there's additive manufacturing, using a laser to fuse titanium powder for rapid prototyping. That's yet a different animal.

Can you provide any more context to your question?

 

[ultramat]

Igearhart, thank you very much.

I am looking for ru powder which I would like to alloy with an additional metal. The spec I get from my supplier is for ru sponge. I am trying to figure out the outcome of this on the final product.

Thank you so much.

 

[EdStainless]

sponge is always plasma (arc) remelted to make solid alloy. You can't just consolidate it, too much porosity and too many impurities.

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