JJay
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What to use for grinding alumina?
I have some alumina boats that I bought for my tube furnace, and they are a fraction of a millimeter too big to fit into my quartz tube. I'd like to
grind them down so they will fit and have a little room to expand, and I'm not sure what could grind alumina other than a diamond grinding wheel. Is
that my only option, or are there other grinding wheels that can grind alumina?
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NedsHead
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Silicon carbide (green wheel) should be able to do it, I use one to grind tungsten carbide lathe tools, it's harder than an aluminium oxide wheel but
softer than diamond, I would guess it can cut through alumina
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JJay
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I wonder if I have any silicon carbide dremel wheels around here anywhere....
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Sulaiman
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I just did a quick calculation;
for 1000C temperature rise the difference in linear thermal expansion between quartz and alumina is 0.7%
i.e. for a 50mm int. dia tube an extra 0.35 mm grinding compared to a sliding fit 
I think that principle is correct, the calculations may not be, check.
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Texium
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Thread Moved
22-11-2023 at 20:10 |
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