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Rifles, Reloading, Optics, Equipment
Gunsmithing
Why is there no coatings used in rifle throats to slow erosion?
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<blockquote data-quote="devins" data-source="post: 584343" data-attributes="member: 27441"><p>To give you some numbers off of the top of my head, I saw some tests from 09 that showed cyclical forces applied at aproximately(they knew, but off of my head) 800 N/cm squared, most porcelains would run in the 100K to 150K cycles before fracturing but I work with a Lithium Disilicate Ceramic that they quit testing at 1 million cycles. That is some pretty durable stuff. It is hardened in a 860 degree C firing cylce that causes it to shrink a predictable amount and the surface can be extremely smooth. I should be able to tell you that number given a little time to retreave it. </p><p> </p><p>Zirconia could also be used. The point of this is, it is possible now but we are going to have to get costs down to make it worth while. But if anyone is really wanting to try it I would be interested in seeing that too and I can scan and mill and fire these to within single digit micron specs. We would just need to run the numbers for the force generated to the bearing surface area on the proposed load to make sure we were using the appropriate material for the strength needed at maximum load and not just over a series of impacts, anyone?</p></blockquote><p></p>
[QUOTE="devins, post: 584343, member: 27441"] To give you some numbers off of the top of my head, I saw some tests from 09 that showed cyclical forces applied at aproximately(they knew, but off of my head) 800 N/cm squared, most porcelains would run in the 100K to 150K cycles before fracturing but I work with a Lithium Disilicate Ceramic that they quit testing at 1 million cycles. That is some pretty durable stuff. It is hardened in a 860 degree C firing cylce that causes it to shrink a predictable amount and the surface can be extremely smooth. I should be able to tell you that number given a little time to retreave it. Zirconia could also be used. The point of this is, it is possible now but we are going to have to get costs down to make it worth while. But if anyone is really wanting to try it I would be interested in seeing that too and I can scan and mill and fire these to within single digit micron specs. We would just need to run the numbers for the force generated to the bearing surface area on the proposed load to make sure we were using the appropriate material for the strength needed at maximum load and not just over a series of impacts, anyone? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Why is there no coatings used in rifle throats to slow erosion?
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