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Rifles, Reloading, Optics, Equipment
Reloading
My HBN experience and process
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<blockquote data-quote="Calvin45" data-source="post: 2912764" data-attributes="member: 109862"><p>[USER=1521]@Mikecr[/USER] I've been doing some more research as your questions are good ones and I'm curious about the possible answers as well.</p><p></p><p>First off, I didn't know that ws2 doesn't change velocity. There is zero doubt that hbn does, I've observed this, as does the Winchester/Nosler black copper oxide lubalox</p><p>Coating, as does moly. That's just weird. But very interesting.</p><p></p><p>One thing of note…ws2 is as you say much slipperier… at room temp in air. I have reason to believe this isn't the case in the environment of a rifle bore. Neither ws2 nor hbn melt per se but they do sublimate and dissociate at certain temps. Ws2 isn't even remotely as thermally stable as HBN. It "melts" or gasses off at 1250 celcius. HBN only does this at 2970 Celsius. So there's that. </p><p></p><p>Additionally in studies regarding oxidation temps of 2 dimensional layers of ws2 and hbn, the ws2 begins to oxidize in air very rapidly at any temperature over 350 celcius. Ws2 is slipperier than hbn…I don't know if wo3 is!</p><p></p><p>Hbn resists oxidation in air at temperatures up to 1200 (at that point the ws2 is far past oxidation and getting into sublimation and dissociation territory). </p><p></p><p>So I don't think it's any mystery at all now. Ws2 is, in fact, not even remotely comparable to HBN regarding both chemical and thermal stability.</p></blockquote><p></p>
[QUOTE="Calvin45, post: 2912764, member: 109862"] [USER=1521]@Mikecr[/USER] I’ve been doing some more research as your questions are good ones and I’m curious about the possible answers as well. First off, I didn’t know that ws2 doesn’t change velocity. There is zero doubt that hbn does, I’ve observed this, as does the Winchester/Nosler black copper oxide lubalox Coating, as does moly. That’s just weird. But very interesting. One thing of note…ws2 is as you say much slipperier… at room temp in air. I have reason to believe this isn’t the case in the environment of a rifle bore. Neither ws2 nor hbn melt per se but they do sublimate and dissociate at certain temps. Ws2 isn’t even remotely as thermally stable as HBN. It “melts” or gasses off at 1250 celcius. HBN only does this at 2970 Celsius. So there’s that. Additionally in studies regarding oxidation temps of 2 dimensional layers of ws2 and hbn, the ws2 begins to oxidize in air very rapidly at any temperature over 350 celcius. Ws2 is slipperier than hbn…I don’t know if wo3 is! Hbn resists oxidation in air at temperatures up to 1200 (at that point the ws2 is far past oxidation and getting into sublimation and dissociation territory). So I don’t think it’s any mystery at all now. Ws2 is, in fact, not even remotely comparable to HBN regarding both chemical and thermal stability. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
My HBN experience and process
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