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  • wierdscience
    replied
    Originally posted by lynnl
    Thanks Evan. That was a pretty informative read.

    It brought to mind something I've noticed before at times. Some carbide tools, e.g. carbide tips on saw blades, have a somewhat shiny, slightly silvery appearance. While others such as almost all of the carbide endmills and metal cutting items I have will have a much darker, almost blackish appearance, tho still shiny.

    After reading that website discussion I'm suspecting the difference in appearance relates to a variation in the ratio of carbide (or possibly other elements) alloyed with the tungsten. I'm sure, as with steel, that there's probably hundreds or thousands of different alloys produced.
    At one time a lot of woodworking carbide used a nickel binder.I never learned exactly why,but I did hear that it made machine brazing much easier which sounds plausible.

    The Kennametal site mentioned something about not wanting carbide with nickel binders,dunno why,maybe because they are stricly a metal working tool company?

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  • lynnl
    replied
    Thanks Evan. That was a pretty informative read.

    It brought to mind something I've noticed before at times. Some carbide tools, e.g. carbide tips on saw blades, have a somewhat shiny, slightly silvery appearance. While others such as almost all of the carbide endmills and metal cutting items I have will have a much darker, almost blackish appearance, tho still shiny.

    After reading that website discussion I'm suspecting the difference in appearance relates to a variation in the ratio of carbide (or possibly other elements) alloyed with the tungsten. I'm sure, as with steel, that there's probably hundreds or thousands of different alloys produced.

    Leave a comment:


  • Evan
    replied
    Lynnl,

    I found the answer to your question.

    Clean cemented carbide inserts and compacts are converted to powder by the zinc process (treatment with molten zinc which is dissolved in the cobalt phase and is then distilled off, leaving a spongy material which is easily crushed). This powder is added back to the manufacture of ready-to-press powder. By this process, not only tungsten carbide but also cobalt, tantalum carbide and other carbides are recycled.
    http://www.azom.com/details.asp?ArticleID=1201

    Note: when they say "the cobalt phase" they mean the cobalt that is used as the binder for the tungsten carbide. Cemented tungsten carbide tools are cemented with cobalt metal. The zinc alloys with the cobalt and leaves behind the tungsten carbide.

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  • Evan
    replied
    I am told by my wife that Carbide Processors, Inc. has a reputation as a good reliable company.

    Leave a comment:


  • wierdscience
    replied
    I don't know about the comapny listed here,but I am fixing to find out.

    I got 80-90lbs of new carbide woodworking inserts and 30lbs of busted tooling.I keep you posted.

    Leave a comment:


  • Tin Falcon
    replied
    Watch Batteries

    Another often overlooked item with scrap value is silver oxide watch/electronics bateries. A jewely friend used to take them to New York and sell them for $ 16 a pound and that was about 15 years ago.
    Tin

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  • snowman
    replied
    thanks, looks like about 5 - 7 bucks a pound. Kennametal has it listed at 7 /lb right now.

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  • Evan
    replied
    Don't be throwing that stuff out! I did a little checking and found this recent post on another forum.

    http://www.eng-tips.com/viewthread.c...=141893&page=1

    Bottom line: It's like gold, well, not quite but it's worth a lot. A coffee can of used carbide is worth $200 to $300 at $5.00 per pound.

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  • lynnl
    replied
    How is carbide recycled? They don't just melt it down like steel, CI, aluminum, etc.., do they?
    As I understand it, carbide cutters are sintered from a powdered form.
    Does that mean they grind it up into a powder, then resinter the stuff?

    Leave a comment:


  • CCWKen
    replied
    The salvage yard I frequent has four 55-gallon drums full of carbide bits. I dig through it when I need a few pieces. It's good to keep some of it, especially drills, for making form tools or special cutters.

    Leave a comment:


  • snowman
    started a topic selling scrap carbide

    selling scrap carbide

    Anybody try the company that advertises at the top of the page at times?

    I've got a bunch of solid drills and stuff...not a bunch in an industrial sense, but a bunch to me.
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